iSharkFly-Docs
/
java-tutorials
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

Merge branch 'master' of https://github.com/eugenp/tutorials into BAEL-15393

This commit is contained in:
amit2103 2019-09-04 12:47:30 +05:30
parent 4f77aa59cd c4a1b44b39
commit 7136ce498b
1253 changed files with 246890 additions and 4578 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

24
.travis.yml
View File

@ -1,24 +0,0 @@
language: java
before_install:
- echo "MAVEN_OPTS='-Xmx2048M -Xss128M -XX:+CMSClassUnloadingEnabled -XX:+UseG1GC -XX:-UseGCOverheadLimit'" > ~/.mavenrc
install: skip
script: travis_wait 60 mvn -q install -Pdefault-first,default-second -Dgib.enabled=true
sudo: required
jdk:
- oraclejdk8
addons:
apt:
packages:
- oracle-java8-installer
cache:
directories:
- .autoconf
- $HOME/.m2

25
README.md
View File

@ -1,12 +1,16 @@
The "REST with Spring" Classes The Courses
============================== ==============================
Here's the Master Class of REST With Spring (along with the newly announced Boot 2 material): <br/>
**[>> THE REST WITH SPRING - MASTER CLASS](http://www.baeldung.com/rest-with-spring-course?utm_source=github&utm_medium=social&utm_content=tutorials&utm_campaign=rws#master-class)**
And here's the Master Class of Learn Spring Security: <br/> Here's the new "Learn Spring" course: <br/>
**[>> LEARN SPRING SECURITY - MASTER CLASS](http://www.baeldung.com/learn-spring-security-course?utm_source=github&utm_medium=social&utm_content=tutorials&utm_campaign=lss#master-class)** **[>> LEARN SPRING - THE MASTER CLASS](https://www.baeldung.com/learn-spring-course?utm_source=github&utm_medium=social&utm_content=tutorials&utm_campaign=ls#master-class)**
Here's the Master Class of "REST With Spring" (along with the new announced Boot 2 material): <br/>
**[>> THE REST WITH SPRING - MASTER CLASS](https://www.baeldung.com/rest-with-spring-course?utm_source=github&utm_medium=social&utm_content=tutorials&utm_campaign=rws#master-class)**
And here's the Master Class of "Learn Spring Security": <br/>
**[>> LEARN SPRING SECURITY - MASTER CLASS](https://www.baeldung.com/learn-spring-security-course?utm_source=github&utm_medium=social&utm_content=tutorials&utm_campaign=lss#master-class)**
@ -15,7 +19,7 @@ Java and Spring Tutorials
This project is **a collection of small and focused tutorials** - each covering a single and well defined area of development in the Java ecosystem. This project is **a collection of small and focused tutorials** - each covering a single and well defined area of development in the Java ecosystem.
A strong focus of these is, of course, the Spring Framework - Spring, Spring Boot and Spring Security. A strong focus of these is, of course, the Spring Framework - Spring, Spring Boot and Spring Security.
In additional to Spring, the following technologies are in focus: `core Java`, `Jackson`, `HttpClient`, `Guava`. In additional to Spring, the modules here are covering a number of aspects in Java.
Building the project Building the project
@ -32,8 +36,15 @@ Running a Spring Boot module
==================== ====================
To run a Spring Boot module run the command: `mvn spring-boot:run` in the module directory To run a Spring Boot module run the command: `mvn spring-boot:run` in the module directory
###Running Tests
Working with the IDE
====================
This repo contains a large number of modules.
When you're working with an individual module, there's no need to import all of them (or build all of them) - you can simply import that particular module in either Eclipse or IntelliJ.
Running Tests
=============
The command `mvn clean install` will run the unit tests in a module. The command `mvn clean install` will run the unit tests in a module.
To run the integration tests, use the command `mvn clean install -Pintegration-lite-first` To run the integration tests, use the command `mvn clean install -Pintegration-lite-first`

3
algorithms-miscellaneous-3/README.md
View File

@ -1,4 +1,4 @@
## Relevant articles: ## Relevant Articles:
- [Java Two Pointer Technique](https://www.baeldung.com/java-two-pointer-technique) - [Java Two Pointer Technique](https://www.baeldung.com/java-two-pointer-technique)
- [Implementing Simple State Machines with Java Enums](https://www.baeldung.com/java-enum-simple-state-machine) - [Implementing Simple State Machines with Java Enums](https://www.baeldung.com/java-enum-simple-state-machine)
@ -7,3 +7,4 @@
- [Checking If a List Is Sorted in Java](https://www.baeldung.com/java-check-if-list-sorted) - [Checking If a List Is Sorted in Java](https://www.baeldung.com/java-check-if-list-sorted)
- [Checking if a Java Graph has a Cycle](https://www.baeldung.com/java-graph-has-a-cycle) - [Checking if a Java Graph has a Cycle](https://www.baeldung.com/java-graph-has-a-cycle)
- [A Guide to the Folding Technique in Java](https://www.baeldung.com/folding-hashing-technique) - [A Guide to the Folding Technique in Java](https://www.baeldung.com/folding-hashing-technique)
- [Creating a Triangle with for Loops in Java](https://www.baeldung.com/java-print-triangle)

43
algorithms-miscellaneous-3/pom.xml
View File

@ -1,5 +1,5 @@
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"> xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion> <modelVersion>4.0.0</modelVersion>
<artifactId>algorithms-miscellaneous-3</artifactId> <artifactId>algorithms-miscellaneous-3</artifactId>
<version>0.0.1-SNAPSHOT</version> <version>0.0.1-SNAPSHOT</version>
@ -18,17 +18,41 @@
<version>${org.assertj.core.version}</version> <version>${org.assertj.core.version}</version>
<scope>test</scope> <scope>test</scope>
</dependency> </dependency>
<dependency> <dependency>
<groupId>org.apache.commons</groupId> <groupId>org.apache.commons</groupId>
<artifactId>commons-collections4</artifactId> <artifactId>commons-collections4</artifactId>
<version>${commons-collections4.version}</version> <version>${commons-collections4.version}</version>
</dependency> </dependency>
<dependency> <dependency>
<groupId>com.google.guava</groupId> <groupId>com.google.guava</groupId>
<artifactId>guava</artifactId> <artifactId>guava</artifactId>
<version>${guava.version}</version> <version>${guava.version}</version>
</dependency>
<dependency>
<groupId>com.squareup.retrofit2</groupId>
<artifactId>retrofit</artifactId>
<version>${retrofit.version}</version>
</dependency>
<dependency>
<groupId>com.squareup.retrofit2</groupId>
<artifactId>converter-jackson</artifactId>
<version>${retrofit.version}</version>
</dependency>
<dependency>
<groupId>org.apache.commons</groupId>
<artifactId>commons-lang3</artifactId>
<version>3.8.1</version>
</dependency>
<dependency>
<groupId>pl.pragmatists</groupId>
<artifactId>JUnitParams</artifactId>
<version>1.1.0</version>
<scope>test</scope>
</dependency> </dependency>
</dependencies> </dependencies>
@ -48,5 +72,6 @@
<org.assertj.core.version>3.9.0</org.assertj.core.version> <org.assertj.core.version>3.9.0</org.assertj.core.version>
<commons-collections4.version>4.3</commons-collections4.version> <commons-collections4.version>4.3</commons-collections4.version>
<guava.version>28.0-jre</guava.version> <guava.version>28.0-jre</guava.version>
<retrofit.version>2.6.0</retrofit.version>
</properties> </properties>
</project> </project>

35
algorithms-miscellaneous-3/src/main/java/com/baeldung/algorithms/interpolationsearch/InterpolationSearch.java Normal file
View File

@ -0,0 +1,35 @@
package com.baeldung.algorithms.interpolationsearch;
public class InterpolationSearch {
public static int interpolationSearch(int[] data, int item) {
int highEnd = (data.length - 1);
int lowEnd = 0;
while (item >= data[lowEnd] && item <= data[highEnd] && lowEnd <= highEnd) {
int probe = lowEnd + (highEnd - lowEnd) * (item - data[lowEnd]) / (data[highEnd] - data[lowEnd]);
if (highEnd == lowEnd) {
if (data[lowEnd] == item) {
return lowEnd;
} else {
return -1;
}
}
if (data[probe] == item) {
return probe;
}
if (data[probe] < item) {
lowEnd = probe + 1;
} else {
highEnd = probe - 1;
}
}
return -1;
}
}

45
algorithms-miscellaneous-3/src/main/java/com/baeldung/algorithms/kmeans/Centroid.java Normal file
View File

@ -0,0 +1,45 @@
package com.baeldung.algorithms.kmeans;
import java.util.Map;
import java.util.Objects;
/**
* Encapsulates all coordinates for a particular cluster centroid.
*/
public class Centroid {
/**
* The centroid coordinates.
*/
private final Map<String, Double> coordinates;
public Centroid(Map<String, Double> coordinates) {
this.coordinates = coordinates;
}
public Map<String, Double> getCoordinates() {
return coordinates;
}
@Override
public boolean equals(Object o) {
if (this == o) {
return true;
}
if (o == null || getClass() != o.getClass()) {
return false;
}
Centroid centroid = (Centroid) o;
return Objects.equals(getCoordinates(), centroid.getCoordinates());
}
@Override
public int hashCode() {
return Objects.hash(getCoordinates());
}
@Override
public String toString() {
return "Centroid " + coordinates;
}
}

20
algorithms-miscellaneous-3/src/main/java/com/baeldung/algorithms/kmeans/Distance.java Normal file
View File

@ -0,0 +1,20 @@
package com.baeldung.algorithms.kmeans;
import java.util.Map;
/**
* Defines a contract to calculate distance between two feature vectors. The less the
* calculated distance, the more two items are similar to each other.
*/
public interface Distance {
/**
* Calculates the distance between two feature vectors.
*
* @param f1 The first set of features.
* @param f2 The second set of features.
* @return Calculated distance.
* @throws IllegalArgumentException If the given feature vectors are invalid.
*/
double calculate(Map<String, Double> f1, Map<String, Double> f2);
}

23
algorithms-miscellaneous-3/src/main/java/com/baeldung/algorithms/kmeans/Errors.java Normal file
View File

@ -0,0 +1,23 @@
package com.baeldung.algorithms.kmeans;
import java.util.List;
import java.util.Map;
/**
* Encapsulates methods to calculates errors between centroid and the cluster members.
*/
public class Errors {
public static double sse(Map<Centroid, List<Record>> clustered, Distance distance) {
double sum = 0;
for (Map.Entry<Centroid, List<Record>> entry : clustered.entrySet()) {
Centroid centroid = entry.getKey();
for (Record record : entry.getValue()) {
double d = distance.calculate(centroid.getCoordinates(), record.getFeatures());
sum += Math.pow(d, 2);
}
}
return sum;
}
}

26
algorithms-miscellaneous-3/src/main/java/com/baeldung/algorithms/kmeans/EuclideanDistance.java Normal file
View File

@ -0,0 +1,26 @@
package com.baeldung.algorithms.kmeans;
import java.util.Map;
/**
* Calculates the distance between two items using the Euclidean formula.
*/
public class EuclideanDistance implements Distance {
@Override
public double calculate(Map<String, Double> f1, Map<String, Double> f2) {
if (f1 == null || f2 == null) {
throw new IllegalArgumentException("Feature vectors can't be null");
}
double sum = 0;
for (String key : f1.keySet()) {
Double v1 = f1.get(key);
Double v2 = f2.get(key);
if (v1 != null && v2 != null) sum += Math.pow(v1 - v2, 2);
}
return Math.sqrt(sum);
}
}

236
algorithms-miscellaneous-3/src/main/java/com/baeldung/algorithms/kmeans/KMeans.java Normal file
View File

@ -0,0 +1,236 @@
package com.baeldung.algorithms.kmeans;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Random;
import java.util.Set;
import static java.util.stream.Collectors.toList;
import static java.util.stream.Collectors.toSet;
/**
* Encapsulates an implementation of KMeans clustering algorithm.
*
* @author Ali Dehghani
*/
public class KMeans {
private KMeans() {
throw new IllegalAccessError("You shouldn't call this constructor");
}
/**
* Will be used to generate random numbers.
*/
private static final Random random = new Random();
/**
* Performs the K-Means clustering algorithm on the given dataset.
*
* @param records The dataset.
* @param k Number of Clusters.
* @param distance To calculate the distance between two items.
* @param maxIterations Upper bound for the number of iterations.
* @return K clusters along with their features.
*/
public static Map<Centroid, List<Record>> fit(List<Record> records, int k, Distance distance, int maxIterations) {
applyPreconditions(records, k, distance, maxIterations);
List<Centroid> centroids = randomCentroids(records, k);
Map<Centroid, List<Record>> clusters = new HashMap<>();
Map<Centroid, List<Record>> lastState = new HashMap<>();
// iterate for a pre-defined number of times
for (int i = 0; i < maxIterations; i++) {
boolean isLastIteration = i == maxIterations - 1;
// in each iteration we should find the nearest centroid for each record
for (Record record : records) {
Centroid centroid = nearestCentroid(record, centroids, distance);
assignToCluster(clusters, record, centroid);
}
// if the assignment does not change, then the algorithm terminates
boolean shouldTerminate = isLastIteration || clusters.equals(lastState);
lastState = clusters;
if (shouldTerminate) {
break;
}
// at the end of each iteration we should relocate the centroids
centroids = relocateCentroids(clusters);
clusters = new HashMap<>();
}
return lastState;
}
/**
* Move all cluster centroids to the average of all assigned features.
*
* @param clusters The current cluster configuration.
* @return Collection of new and relocated centroids.
*/
private static List<Centroid> relocateCentroids(Map<Centroid, List<Record>> clusters) {
return clusters
.entrySet()
.stream()
.map(e -> average(e.getKey(), e.getValue()))
.collect(toList());
}
/**
* Moves the given centroid to the average position of all assigned features. If
* the centroid has no feature in its cluster, then there would be no need for a
* relocation. Otherwise, for each entry we calculate the average of all records
* first by summing all the entries and then dividing the final summation value by
* the number of records.
*
* @param centroid The centroid to move.
* @param records The assigned features.
* @return The moved centroid.
*/
private static Centroid average(Centroid centroid, List<Record> records) {
// if this cluster is empty, then we shouldn't move the centroid
if (records == null || records.isEmpty()) {
return centroid;
}
// Since some records don't have all possible attributes, we initialize
// average coordinates equal to current centroid coordinates
Map<String, Double> average = centroid.getCoordinates();
// The average function works correctly if we clear all coordinates corresponding
// to present record attributes
records
.stream()
.flatMap(e -> e
.getFeatures()
.keySet()
.stream())
.forEach(k -> average.put(k, 0.0));
for (Record record : records) {
record
.getFeatures()
.forEach((k, v) -> average.compute(k, (k1, currentValue) -> v + currentValue));
}
average.forEach((k, v) -> average.put(k, v / records.size()));
return new Centroid(average);
}
/**
* Assigns a feature vector to the given centroid. If this is the first assignment for this centroid,
* first we should create the list.
*
* @param clusters The current cluster configuration.
* @param record The feature vector.
* @param centroid The centroid.
*/
private static void assignToCluster(Map<Centroid, List<Record>> clusters, Record record, Centroid centroid) {
clusters.compute(centroid, (key, list) -> {
if (list == null) {
list = new ArrayList<>();
}
list.add(record);
return list;
});
}
/**
* With the help of the given distance calculator, iterates through centroids and finds the
* nearest one to the given record.
*
* @param record The feature vector to find a centroid for.
* @param centroids Collection of all centroids.
* @param distance To calculate the distance between two items.
* @return The nearest centroid to the given feature vector.
*/
private static Centroid nearestCentroid(Record record, List<Centroid> centroids, Distance distance) {
double minimumDistance = Double.MAX_VALUE;
Centroid nearest = null;
for (Centroid centroid : centroids) {
double currentDistance = distance.calculate(record.getFeatures(), centroid.getCoordinates());
if (currentDistance < minimumDistance) {
minimumDistance = currentDistance;
nearest = centroid;
}
}
return nearest;
}
/**
* Generates k random centroids. Before kicking-off the centroid generation process,
* first we calculate the possible value range for each attribute. Then when
* we're going to generate the centroids, we generate random coordinates in
* the [min, max] range for each attribute.
*
* @param records The dataset which helps to calculate the [min, max] range for
* each attribute.
* @param k Number of clusters.
* @return Collections of randomly generated centroids.
*/
private static List<Centroid> randomCentroids(List<Record> records, int k) {
List<Centroid> centroids = new ArrayList<>();
Map<String, Double> maxs = new HashMap<>();
Map<String, Double> mins = new HashMap<>();
for (Record record : records) {
record
.getFeatures()
.forEach((key, value) -> {
// compares the value with the current max and choose the bigger value between them
maxs.compute(key, (k1, max) -> max == null || value > max ? value : max);
// compare the value with the current min and choose the smaller value between them
mins.compute(key, (k1, min) -> min == null || value < min ? value : min);
});
}
Set<String> attributes = records
.stream()
.flatMap(e -> e
.getFeatures()
.keySet()
.stream())
.collect(toSet());
for (int i = 0; i < k; i++) {
Map<String, Double> coordinates = new HashMap<>();
for (String attribute : attributes) {
double max = maxs.get(attribute);
double min = mins.get(attribute);
coordinates.put(attribute, random.nextDouble() * (max - min) + min);
}
centroids.add(new Centroid(coordinates));
}
return centroids;
}
private static void applyPreconditions(List<Record> records, int k, Distance distance, int maxIterations) {
if (records == null || records.isEmpty()) {
throw new IllegalArgumentException("The dataset can't be empty");
}
if (k <= 1) {
throw new IllegalArgumentException("It doesn't make sense to have less than or equal to 1 cluster");
}
if (distance == null) {
throw new IllegalArgumentException("The distance calculator is required");
}
if (maxIterations <= 0) {
throw new IllegalArgumentException("Max iterations should be a positive number");
}
}
}

144
algorithms-miscellaneous-3/src/main/java/com/baeldung/algorithms/kmeans/LastFm.java Normal file
View File

@ -0,0 +1,144 @@
package com.baeldung.algorithms.kmeans;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Collections;
import java.util.HashMap;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.stream.Collectors;
import com.fasterxml.jackson.databind.ObjectMapper;
import okhttp3.OkHttpClient;
import retrofit2.Retrofit;
import retrofit2.converter.jackson.JacksonConverterFactory;
import static java.util.stream.Collectors.toSet;
public class LastFm {
private static OkHttpClient okHttp = new OkHttpClient.Builder()
.addInterceptor(new LastFmService.Authenticator("put your API key here"))
.build();
private static Retrofit retrofit = new Retrofit.Builder()
.client(okHttp)
.addConverterFactory(JacksonConverterFactory.create())
.baseUrl("http://ws.audioscrobbler.com/")
.build();
private static LastFmService lastFm = retrofit.create(LastFmService.class);
private static ObjectMapper mapper = new ObjectMapper();
public static void main(String[] args) throws IOException {
List<String> artists = getTop100Artists();
Set<String> tags = getTop100Tags();
List<Record> records = datasetWithTaggedArtists(artists, tags);
Map<Centroid, List<Record>> clusters = KMeans.fit(records, 7, new EuclideanDistance(), 1000);
// Print the cluster configuration
clusters.forEach((key, value) -> {
System.out.println("------------------------------ CLUSTER -----------------------------------");
System.out.println(sortedCentroid(key));
String members = String.join(", ", value
.stream()
.map(Record::getDescription)
.collect(toSet()));
System.out.print(members);
System.out.println();
System.out.println();
});
Map<String, Object> json = convertToD3CompatibleMap(clusters);
System.out.println(mapper.writeValueAsString(json));
}
private static Map<String, Object> convertToD3CompatibleMap(Map<Centroid, List<Record>> clusters) {
Map<String, Object> json = new HashMap<>();
json.put("name", "Musicians");
List<Map<String, Object>> children = new ArrayList<>();
clusters.forEach((key, value) -> {
Map<String, Object> child = new HashMap<>();
child.put("name", dominantGenre(sortedCentroid(key)));
List<Map<String, String>> nested = new ArrayList<>();
for (Record record : value) {
nested.add(Collections.singletonMap("name", record.getDescription()));
}
child.put("children", nested);
children.add(child);
});
json.put("children", children);
return json;
}
private static String dominantGenre(Centroid centroid) {
return centroid
.getCoordinates()
.keySet()
.stream()
.limit(2)
.collect(Collectors.joining(", "));
}
private static Centroid sortedCentroid(Centroid key) {
List<Map.Entry<String, Double>> entries = new ArrayList<>(key
.getCoordinates()
.entrySet());
entries.sort((e1, e2) -> e2
.getValue()
.compareTo(e1.getValue()));
Map<String, Double> sorted = new LinkedHashMap<>();
for (Map.Entry<String, Double> entry : entries) {
sorted.put(entry.getKey(), entry.getValue());
}
return new Centroid(sorted);
}
private static List<Record> datasetWithTaggedArtists(List<String> artists, Set<String> topTags) throws IOException {
List<Record> records = new ArrayList<>();
for (String artist : artists) {
Map<String, Double> tags = lastFm
.topTagsFor(artist)
.execute()
.body()
.all();
// Only keep popular tags.
tags
.entrySet()
.removeIf(e -> !topTags.contains(e.getKey()));
records.add(new Record(artist, tags));
}
return records;
}
private static Set<String> getTop100Tags() throws IOException {
return lastFm
.topTags()
.execute()
.body()
.all();
}
private static List<String> getTop100Artists() throws IOException {
List<String> artists = new ArrayList<>();
for (int i = 1; i <= 2; i++) {
artists.addAll(lastFm
.topArtists(i)
.execute()
.body()
.all());
}
return artists;
}
}

118
algorithms-miscellaneous-3/src/main/java/com/baeldung/algorithms/kmeans/LastFmService.java Normal file
View File

@ -0,0 +1,118 @@
package com.baeldung.algorithms.kmeans;
import java.io.IOException;
import java.util.Collections;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.stream.Collectors;
import com.fasterxml.jackson.annotation.JsonAutoDetect;
import com.fasterxml.jackson.annotation.JsonProperty;
import okhttp3.HttpUrl;
import okhttp3.Interceptor;
import okhttp3.Request;
import okhttp3.Response;
import retrofit2.Call;
import retrofit2.http.GET;
import retrofit2.http.Query;
import static com.fasterxml.jackson.annotation.JsonAutoDetect.Visibility.ANY;
import static java.util.stream.Collectors.toList;
public interface LastFmService {
@GET("/2.0/?method=chart.gettopartists&format=json&limit=50")
Call<Artists> topArtists(@Query("page") int page);
@GET("/2.0/?method=artist.gettoptags&format=json&limit=20&autocorrect=1")
Call<Tags> topTagsFor(@Query("artist") String artist);
@GET("/2.0/?method=chart.gettoptags&format=json&limit=100")
Call<TopTags> topTags();
/**
* HTTP interceptor to intercept all HTTP requests and add the API key to them.
*/
class Authenticator implements Interceptor {
private final String apiKey;
Authenticator(String apiKey) {
this.apiKey = apiKey;
}
@Override
public Response intercept(Chain chain) throws IOException {
HttpUrl url = chain
.request()
.url()
.newBuilder()
.addQueryParameter("api_key", apiKey)
.build();
Request request = chain
.request()
.newBuilder()
.url(url)
.build();
return chain.proceed(request);
}
}
@JsonAutoDetect(fieldVisibility = ANY)
class TopTags {
private Map<String, Object> tags;
@SuppressWarnings("unchecked")
public Set<String> all() {
List<Map<String, Object>> topTags = (List<Map<String, Object>>) tags.get("tag");
return topTags
.stream()
.map(e -> ((String) e.get("name")))
.collect(Collectors.toSet());
}
}
@JsonAutoDetect(fieldVisibility = ANY)
class Tags {
@JsonProperty("toptags") private Map<String, Object> topTags;
@SuppressWarnings("unchecked")
public Map<String, Double> all() {
try {
Map<String, Double> all = new HashMap<>();
List<Map<String, Object>> tags = (List<Map<String, Object>>) topTags.get("tag");
for (Map<String, Object> tag : tags) {
all.put(((String) tag.get("name")), ((Integer) tag.get("count")).doubleValue());
}
return all;
} catch (Exception e) {
return Collections.emptyMap();
}
}
}
@JsonAutoDetect(fieldVisibility = ANY)
class Artists {
private Map<String, Object> artists;
@SuppressWarnings("unchecked")
public List<String> all() {
try {
List<Map<String, Object>> artists = (List<Map<String, Object>>) this.artists.get("artist");
return artists
.stream()
.map(e -> ((String) e.get("name")))
.collect(toList());
} catch (Exception e) {
return Collections.emptyList();
}
}
}
}

65
algorithms-miscellaneous-3/src/main/java/com/baeldung/algorithms/kmeans/Record.java Normal file
View File

@ -0,0 +1,65 @@
package com.baeldung.algorithms.kmeans;
import java.util.Map;
import java.util.Objects;
/**
* Encapsulates all feature values for a few attributes. Optionally each record
* can be described with the {@link #description} field.
*/
public class Record {
/**
* The record description. For example, this can be the artist name for the famous musician
* example.
*/
private final String description;
/**
* Encapsulates all attributes and their corresponding values, i.e. features.
*/
private final Map<String, Double> features;
public Record(String description, Map<String, Double> features) {
this.description = description;
this.features = features;
}
public Record(Map<String, Double> features) {
this("", features);
}
public String getDescription() {
return description;
}
public Map<String, Double> getFeatures() {
return features;
}
@Override
public String toString() {
String prefix = description == null || description
.trim()
.isEmpty() ? "Record" : description;
return prefix + ": " + features;
}
@Override
public boolean equals(Object o) {
if (this == o) {
return true;
}
if (o == null || getClass() != o.getClass()) {
return false;
}
Record record = (Record) o;
return Objects.equals(getDescription(), record.getDescription()) && Objects.equals(getFeatures(), record.getFeatures());
}
@Override
public int hashCode() {
return Objects.hash(getDescription(), getFeatures());
}
}

61
algorithms-miscellaneous-3/src/main/java/com/baeldung/algorithms/printtriangles/PrintTriangleExamples.java Normal file
View File

@ -0,0 +1,61 @@
package com.baeldung.algorithms.printtriangles;
import org.apache.commons.lang3.StringUtils;
public class PrintTriangleExamples {
public static String printARightTriangle(int N) {
StringBuilder result = new StringBuilder();
for (int r = 1; r <= N; r++) {
for (int j = 1; j <= r; j++) {
result.append("*");
}
result.append(System.lineSeparator());
}
return result.toString();
}
public static String printAnIsoscelesTriangle(int N) {
StringBuilder result = new StringBuilder();
for (int r = 1; r <= N; r++) {
for (int sp = 1; sp <= N - r; sp++) {
result.append(" ");
}
for (int c = 1; c <= (r * 2) - 1; c++) {
result.append("*");
}
result.append(System.lineSeparator());
}
return result.toString();
}
public static String printAnIsoscelesTriangleUsingStringUtils(int N) {
StringBuilder result = new StringBuilder();
for (int r = 1; r <= N; r++) {
result.append(StringUtils.repeat(' ', N - r));
result.append(StringUtils.repeat('*', 2 * r - 1));
result.append(System.lineSeparator());
}
return result.toString();
}
public static String printAnIsoscelesTriangleUsingSubstring(int N) {
StringBuilder result = new StringBuilder();
String helperString = StringUtils.repeat(' ', N - 1) + StringUtils.repeat('*', N * 2 - 1);
for (int r = 0; r < N; r++) {
result.append(helperString.substring(r, N + 2 * r));
result.append(System.lineSeparator());
}
return result.toString();
}
public static void main(String[] args) {
System.out.println(printARightTriangle(5));
System.out.println(printAnIsoscelesTriangle(5));
System.out.println(printAnIsoscelesTriangleUsingStringUtils(5));
System.out.println(printAnIsoscelesTriangleUsingSubstring(5));
}
}

3384
algorithms-miscellaneous-3/src/main/resources/kmeans/artists.json Normal file
View File

File diff suppressed because it is too large Load Diff

490
algorithms-miscellaneous-3/src/main/resources/kmeans/lastfm.json Normal file
View File

@ -0,0 +1,490 @@
{
"children": [
{
"children": [
{
"name": "Radiohead"
},
{
"name": "Red Hot Chili Peppers"
},
{
"name": "Coldplay"
},
{
"name": "Nirvana"
},
{
"name": "Panic! at the Disco"
},
{
"name": "The Cure"
},
{
"name": "Linkin Park"
},
{
"name": "Radiohead"
},
{
"name": "Red Hot Chili Peppers"
},
{
"name": "Coldplay"
},
{
"name": "Nirvana"
},
{
"name": "Panic! at the Disco"
},
{
"name": "The Cure"
},
{
"name": "Linkin Park"
},
{
"name": "Muse"
},
{
"name": "Maroon 5"
},
{
"name": "Foo Fighters"
},
{
"name": "Paramore"
},
{
"name": "Oasis"
},
{
"name": "Fall Out Boy"
},
{
"name": "OneRepublic"
},
{
"name": "Weezer"
},
{
"name": "System of a Down"
},
{
"name": "The White Stripes"
}
],
"name": "rock, alternative"
},
{
"children": [
{
"name": "Lil Nas X"
},
{
"name": "Post Malone"
},
{
"name": "Drake"
},
{
"name": "Kanye West"
},
{
"name": "Kendrick Lamar"
},
{
"name": "Tyler, the Creator"
},
{
"name": "Eminem"
},
{
"name": "Childish Gambino"
},
{
"name": "Frank Ocean"
},
{
"name": "Lil Nas X"
},
{
"name": "Post Malone"
},
{
"name": "Drake"
},
{
"name": "Kanye West"
},
{
"name": "Kendrick Lamar"
},
{
"name": "Tyler, the Creator"
},
{
"name": "Eminem"
},
{
"name": "Childish Gambino"
},
{
"name": "Frank Ocean"
},
{
"name": "Lizzo"
},
{
"name": "Travi$ Scott"
},
{
"name": "A$AP Rocky"
},
{
"name": "Nicki Minaj"
},
{
"name": "xxxtentacion"
}
],
"name": "Hip-Hop, rap"
},
{
"children": [
{
"name": "Arctic Monkeys"
},
{
"name": "Imagine Dragons"
},
{
"name": "The Killers"
},
{
"name": "Gorillaz"
},
{
"name": "The Black Keys"
},
{
"name": "Arctic Monkeys"
},
{
"name": "Imagine Dragons"
},
{
"name": "The Killers"
},
{
"name": "Gorillaz"
},
{
"name": "The Black Keys"
},
{
"name": "Twenty One Pilots"
},
{
"name": "Ellie Goulding"
},
{
"name": "Florence + the Machine"
},
{
"name": "Vampire Weekend"
},
{
"name": "The Smiths"
},
{
"name": "The Strokes"
},
{
"name": "MGMT"
},
{
"name": "Foster the People"
},
{
"name": "Two Door Cinema Club"
},
{
"name": "Cage the Elephant"
},
{
"name": "Arcade Fire"
},
{
"name": "The 1975"
}
],
"name": "indie, alternative"
},
{
"children": [
{
"name": "Ed Sheeran"
},
{
"name": "Tame Impala"
},
{
"name": "Ed Sheeran"
},
{
"name": "Tame Impala"
},
{
"name": "Green Day"
},
{
"name": "Metallica"
},
{
"name": "blink-182"
},
{
"name": "Bon Iver"
},
{
"name": "The Clash"
}
],
"name": "rock, punk rock"
},
{
"children": [
{
"name": "Calvin Harris"
},
{
"name": "The Weeknd"
},
{
"name": "The Chainsmokers"
},
{
"name": "Daft Punk"
},
{
"name": "Marshmello"
},
{
"name": "David Guetta"
},
{
"name": "Calvin Harris"
},
{
"name": "The Weeknd"
},
{
"name": "The Chainsmokers"
},
{
"name": "Daft Punk"
},
{
"name": "Marshmello"
},
{
"name": "David Guetta"
},
{
"name": "Avicii"
},
{
"name": "Kygo"
},
{
"name": "Martin Garrix"
},
{
"name": "Major Lazer"
},
{
"name": "Depeche Mode"
}
],
"name": "electronic, dance"
},
{
"children": [
{
"name": "Queen"
},
{
"name": "The Beatles"
},
{
"name": "David Bowie"
},
{
"name": "Fleetwood Mac"
},
{
"name": "Pink Floyd"
},
{
"name": "The Rolling Stones"
},
{
"name": "Led Zeppelin"
},
{
"name": "Queen"
},
{
"name": "The Beatles"
},
{
"name": "David Bowie"
},
{
"name": "Fleetwood Mac"
},
{
"name": "Pink Floyd"
},
{
"name": "The Rolling Stones"
},
{
"name": "Led Zeppelin"
},
{
"name": "Elton John"
}
],
"name": "classic rock, rock"
},
{
"children": [
{
"name": "Billie Eilish"
},
{
"name": "Ariana Grande"
},
{
"name": "Taylor Swift"
},
{
"name": "Beyoncé"
},
{
"name": "Shawn Mendes"
},
{
"name": "Rihanna"
},
{
"name": "Lana Del Rey"
},
{
"name": "Katy Perry"
},
{
"name": "Lady Gaga"
},
{
"name": "Miley Cyrus"
},
{
"name": "Mark Ronson"
},
{
"name": "Madonna"
},
{
"name": "Lorde"
},
{
"name": "Khalid"
},
{
"name": "Billie Eilish"
},
{
"name": "Ariana Grande"
},
{
"name": "Taylor Swift"
},
{
"name": "Beyoncé"
},
{
"name": "Shawn Mendes"
},
{
"name": "Rihanna"
},
{
"name": "Lana Del Rey"
},
{
"name": "Katy Perry"
},
{
"name": "Lady Gaga"
},
{
"name": "Miley Cyrus"
},
{
"name": "Mark Ronson"
},
{
"name": "Madonna"
},
{
"name": "Lorde"
},
{
"name": "Khalid"
},
{
"name": "Sia"
},
{
"name": "Sam Smith"
},
{
"name": "Halsey"
},
{
"name": "Michael Jackson"
},
{
"name": "Charli XCX"
},
{
"name": "Britney Spears"
},
{
"name": "Dua Lipa"
},
{
"name": "Jonas Brothers"
},
{
"name": "Bruno Mars"
},
{
"name": "Carly Rae Jepsen"
},
{
"name": "P!nk"
},
{
"name": "Adele"
}
],
"name": "pop, female vocalists"
}
],
"name": "Musicians"
}

68
algorithms-miscellaneous-3/src/main/resources/kmeans/radial.html Normal file
View File

@ -0,0 +1,68 @@
<!DOCTYPE html>
<meta charset="utf-8">
<style>
.node circle {
fill: #fff;
stroke: steelblue;
stroke-width: 1.5px;
}
.node {
font: 10px sans-serif;
}
.link {
fill: none;
stroke: #ccc;
stroke-width: 1.5px;
}
</style>
<body>
<script src="http://d3js.org/d3.v3.min.js"></script>
<script>
var diameter = 1100;
var tree = d3.layout.tree()
.size([360, diameter / 2 - 300])
.separation(function (a, b) {
return (a.parent == b.parent ? 1 : 2) / a.depth;
});
var diagonal = d3.svg.diagonal.radial()
.projection(function (d) {
return [d.y, d.x / 180 * Math.PI];
});
var svg = d3.select("body").append("svg")
.attr("width", diameter)
.attr("height", diameter - 150)
.append("g")
.attr("transform", "translate(" + diameter / 2 + "," + diameter / 2 + ")");
d3.json("lastfm.json", function (error, root) {
var nodes = tree.nodes(root),
links = tree.links(nodes);
var link = svg.selectAll(".link")
.data(links)
.enter().append("path")
.attr("class", "link")
.attr("d", diagonal);
var node = svg.selectAll(".node")
.data(nodes)
.enter().append("g")
.attr("class", "node")
.attr("transform", function (d) {
return "rotate(" + (d.x - 90) + ")translate(" + d.y + ")";
})
node.append("circle")
.attr("r", 4.5);
node.append("text")
.attr("dy", ".31em")
.attr("text-anchor", function (d) {
return d.x < 180 ? "start" : "end";
})
.attr("transform", function (d) {
return d.x < 180 ? "translate(8)" : "rotate(180)translate(-8)";
})
.text(function (d) {
return d.name;
});
});
d3.select(self.frameElement).style("height", diameter - 150 + "px");
</script>

29
algorithms-miscellaneous-3/src/test/java/com/baeldung/algorithms/interpolationsearch/InterpolationSearchUnitTest.java Normal file
View File

@ -0,0 +1,29 @@
package com.baeldung.algorithms.interpolationsearch;
import static org.junit.jupiter.api.Assertions.assertEquals;
import org.junit.Before;
import org.junit.Test;
public class InterpolationSearchUnitTest {
private int[] myData;
@Before
public void setUp() {
myData = new int[]{13,21,34,55,69,73,84,101};
}
@Test
public void givenSortedArray_whenLookingFor84_thenReturn6() {
int pos = InterpolationSearch.interpolationSearch(myData, 84);
assertEquals(6, pos);
}
@Test
public void givenSortedArray_whenLookingFor19_thenReturnMinusOne() {
int pos = InterpolationSearch.interpolationSearch(myData, 19);
assertEquals(-1, pos);
}
}

101
algorithms-miscellaneous-3/src/test/java/com/baeldung/algorithms/printtriangles/PrintTriangleExamplesUnitTest.java Normal file
View File

@ -0,0 +1,101 @@
package com.baeldung.algorithms.printtriangles;
import junitparams.JUnitParamsRunner;
import junitparams.Parameters;
import org.junit.Test;
import org.junit.runner.RunWith;
import static org.junit.Assert.assertEquals;
@RunWith(JUnitParamsRunner.class)
public class PrintTriangleExamplesUnitTest {
private static Object[][] rightTriangles() {
String expected0 = "";
String expected2 = "*" + System.lineSeparator()
+ "**" + System.lineSeparator();
String expected5 = "*" + System.lineSeparator()
+ "**" + System.lineSeparator()
+ "***" + System.lineSeparator()
+ "****" + System.lineSeparator()
+ "*****" + System.lineSeparator();
String expected7 = "*" + System.lineSeparator()
+ "**" + System.lineSeparator()
+ "***" + System.lineSeparator()
+ "****" + System.lineSeparator()
+ "*****" + System.lineSeparator()
+ "******" + System.lineSeparator()
+ "*******" + System.lineSeparator();
return new Object[][] {
{ 0, expected0 },
{ 2, expected2 },
{ 5, expected5 },
{ 7, expected7 }
};
}
@Test
@Parameters(method = "rightTriangles")
public void whenPrintARightTriangleIsCalled_ThenTheCorrectStringIsReturned(int nrOfRows, String expected) {
String actual = PrintTriangleExamples.printARightTriangle(nrOfRows);
assertEquals(expected, actual);
}
private static Object[][] isoscelesTriangles() {
String expected0 = "";
String expected2 = " *" + System.lineSeparator()
+ "***" + System.lineSeparator();
String expected5 = " *" + System.lineSeparator()
+ " ***" + System.lineSeparator()
+ " *****" + System.lineSeparator()
+ " *******" + System.lineSeparator()
+ "*********" + System.lineSeparator();
String expected7 = " *" + System.lineSeparator()
+ " ***" + System.lineSeparator()
+ " *****" + System.lineSeparator()
+ " *******" + System.lineSeparator()
+ " *********" + System.lineSeparator()
+ " ***********" + System.lineSeparator()
+ "*************" + System.lineSeparator();
return new Object[][] {
{ 0, expected0 },
{ 2, expected2 },
{ 5, expected5 },
{ 7, expected7 }
};
}
@Test
@Parameters(method = "isoscelesTriangles")
public void whenPrintAnIsoscelesTriangleIsCalled_ThenTheCorrectStringIsReturned(int nrOfRows, String expected) {
String actual = PrintTriangleExamples.printAnIsoscelesTriangle(nrOfRows);
assertEquals(expected, actual);
}
@Test
@Parameters(method = "isoscelesTriangles")
public void whenPrintAnIsoscelesTriangleUsingStringUtilsIsCalled_ThenTheCorrectStringIsReturned(int nrOfRows, String expected) {
String actual = PrintTriangleExamples.printAnIsoscelesTriangleUsingStringUtils(nrOfRows);
assertEquals(expected, actual);
}
@Test
@Parameters(method = "isoscelesTriangles")
public void whenPrintAnIsoscelesTriangleUsingSubstringIsCalled_ThenTheCorrectStringIsReturned(int nrOfRows, String expected) {
String actual = PrintTriangleExamples.printAnIsoscelesTriangleUsingSubstring(nrOfRows);
assertEquals(expected, actual);
}
}

2
algorithms-sorting/README.md
View File

@ -5,3 +5,5 @@
- [Quicksort Algorithm Implementation in Java](https://www.baeldung.com/java-quicksort) - [Quicksort Algorithm Implementation in Java](https://www.baeldung.com/java-quicksort)
- [Insertion Sort in Java](https://www.baeldung.com/java-insertion-sort) - [Insertion Sort in Java](https://www.baeldung.com/java-insertion-sort)
- [Heap Sort in Java](https://www.baeldung.com/java-heap-sort) - [Heap Sort in Java](https://www.baeldung.com/java-heap-sort)
- [Shell Sort in Java](https://www.baeldung.com/java-shell-sort)
- [Counting Sort in Java](https://www.baeldung.com/java-counting-sort)

48
algorithms-sorting/src/main/java/com/baeldung/algorithms/counting/CountingSort.java Normal file
View File

@ -0,0 +1,48 @@
package com.baeldung.algorithms.counting;
import java.util.Arrays;
import java.util.stream.IntStream;
public class CountingSort {
public static int[] sort(int[] input, int k) {
verifyPreconditions(input, k);
if (input.length == 0) return input;
int[] c = countElements(input, k);
int[] sorted = new int[input.length];
for (int i = input.length - 1; i >= 0; i--) {
int current = input[i];
sorted[c[current] - 1] = current;
c[current] -= 1;
}
return sorted;
}
static int[] countElements(int[] input, int k) {
int[] c = new int[k + 1];
Arrays.fill(c, 0);
for (int i : input) {
c[i] += 1;
}
for (int i = 1; i < c.length; i++) {
c[i] += c[i - 1];
}
return c;
}
private static void verifyPreconditions(int[] input, int k) {
if (input == null) {
throw new IllegalArgumentException("Input is required");
}
int min = IntStream.of(input).min().getAsInt();
int max = IntStream.of(input).max().getAsInt();
if (min < 0 || max > k) {
throw new IllegalArgumentException("The input numbers should be between zero and " + k);
}
}
}

25
algorithms-sorting/src/main/java/com/baeldung/algorithms/inoutsort/InOutSort.java Normal file
View File

@ -0,0 +1,25 @@
package com.baeldung.algorithms.inoutsort;
public class InOutSort {
public static int[] reverseInPlace(int A[]) {
int n = A.length;
for (int i = 0; i < n / 2; i++) {
int temp = A[i];
A[i] = A[n - 1 - i];
A[n - 1 - i] = temp;
}
return A;
}
public static int[] reverseOutOfPlace(int A[]) {
int n = A.length;
int[] B = new int[n];
for (int i = 0; i < n; i++) {
B[n - i - 1] = A[i];
}
return B;
}
}

38
algorithms-sorting/src/main/java/com/baeldung/algorithms/selectionsort/SelectionSort.java Normal file
View File

@ -0,0 +1,38 @@
package com.baeldung.algorithms.selectionsort;
public class SelectionSort {
public static void sortAscending(final int[] arr) {
for (int i = 0; i < arr.length - 1; i++) {
int minElementIndex = i;
for (int j = i + 1; j < arr.length; j++) {
if (arr[minElementIndex] > arr[j]) {
minElementIndex = j;
}
}
if (minElementIndex != i) {
int temp = arr[i];
arr[i] = arr[minElementIndex];
arr[minElementIndex] = temp;
}
}
}
public static void sortDescending(final int[] arr) {
for (int i = 0; i < arr.length - 1; i++) {
int maxElementIndex = i;
for (int j = i + 1; j < arr.length; j++) {
if (arr[maxElementIndex] < arr[j]) {
maxElementIndex = j;
}
}
if (maxElementIndex != i) {
int temp = arr[i];
arr[i] = arr[maxElementIndex];
arr[maxElementIndex] = temp;
}
}
}
}

2
algorithms-miscellaneous-3/src/main/java/com/baeldung/algorithms/stringsortingbynumber/NaturalOrderComparators.java → algorithms-sorting/src/main/java/com/baeldung/algorithms/sort/bynumber/NaturalOrderComparators.java
View File

@ -1,4 +1,4 @@
package com.baeldung.algorithms.stringsortingbynumber; package com.baeldung.algorithms.sort.bynumber;
import java.util.Comparator; import java.util.Comparator;

32
algorithms-sorting/src/test/java/com/baeldung/algorithms/counting/CountingSortUnitTest.java Normal file
View File

@ -0,0 +1,32 @@
package com.baeldung.algorithms.counting;
import java.util.Arrays;
import static org.junit.jupiter.api.Assertions.assertArrayEquals;
import org.junit.jupiter.api.Test;
class CountingSortUnitTest {
@Test
void countElements_GivenAnArray_ShouldCalculateTheFrequencyArrayAsExpected() {
int k = 5;
int[] input = { 4, 3, 2, 5, 4, 3, 5, 1, 0, 2, 5 };
int[] c = CountingSort.countElements(input, k);
int[] expected = { 1, 2, 4, 6, 8, 11 };
assertArrayEquals(expected, c);
}
@Test
void sort_GivenAnArray_ShouldSortTheInputAsExpected() {
int k = 5;
int[] input = { 4, 3, 2, 5, 4, 3, 5, 1, 0, 2, 5 };
int[] sorted = CountingSort.sort(input, k);
// Our sorting algorithm and Java's should return the same result
Arrays.sort(input);
assertArrayEquals(input, sorted);
}
}

23
algorithms-sorting/src/test/java/com/baeldung/algorithms/inoutsort/InOutSortUnitTest.java Normal file
View File

@ -0,0 +1,23 @@
package com.baeldung.algorithms.inoutsort;
import static org.junit.Assert.*;
import static org.junit.Assert.assertArrayEquals;
import org.junit.Test;
public class InOutSortUnitTest {
@Test
public void givenArray_whenInPlaceSort_thenReversed() {
int[] input = {1, 2, 3, 4, 5, 6, 7};
int[] expected = {7, 6, 5, 4, 3, 2, 1};
assertArrayEquals("the two arrays are not equal", expected, InOutSort.reverseInPlace(input));
}
@Test
public void givenArray_whenOutOfPlaceSort_thenReversed() {
int[] input = {1, 2, 3, 4, 5, 6, 7};
int[] expected = {7, 6, 5, 4, 3, 2, 1};
assertArrayEquals("the two arrays are not equal", expected, InOutSort.reverseOutOfPlace(input));
}
}

25
algorithms-sorting/src/test/java/com/baeldung/algorithms/selectionsort/SelectionSortUnitTest.java Normal file
View File

@ -0,0 +1,25 @@
package com.baeldung.algorithms.selectionsort;
import static org.junit.Assert.*;
import static org.junit.Assert.assertArrayEquals;
import org.junit.Test;
public class SelectionSortUnitTest {
@Test
public void givenUnsortedArray_whenSelectionSort_SortAscending_thenSortedAsc() {
int[] input = { 5, 4, 1, 6, 2 };
SelectionSort.sortAscending(input);
int[] expected = {1, 2, 4, 5, 6};
assertArrayEquals("the two arrays are not equal", expected, input);
}
@Test
public void givenUnsortedArray_whenSelectionSort_SortDescending_thenSortedDesc() {
int[] input = { 5, 4, 1, 6, 2 };
SelectionSort.sortDescending(input);
int[] expected = {6, 5, 4, 2, 1};
assertArrayEquals("the two arrays are not equal", expected, input);
}
}

4
algorithms-miscellaneous-3/src/test/java/com/baeldung/algorithms/stringsortingbynumber/NaturalOrderComparatorsUnitTest.java → algorithms-sorting/src/test/java/com/baeldung/algorithms/sort/bynumber/NaturalOrderComparatorsUnitTest.java
View File

@ -1,6 +1,6 @@
package com.baeldung.algorithms.stringsortingbynumber; package com.baeldung.algorithms.sort.bynumber;
import com.baeldung.algorithms.stringsortingbynumber.NaturalOrderComparators; import com.baeldung.algorithms.sort.bynumber.NaturalOrderComparators;
import org.junit.Test; import org.junit.Test;
import java.util.ArrayList; import java.util.ArrayList;

4
apache-olingo/olingo2/pom.xml
View File

@ -4,9 +4,9 @@
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"> xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion> <modelVersion>4.0.0</modelVersion>
<groupId>org.baeldung.examples.olingo2</groupId> <groupId>org.baeldung.examples.olingo2</groupId>
<artifactId>olingo2-sample</artifactId> <artifactId>olingo2</artifactId>
<version>0.0.1-SNAPSHOT</version> <version>0.0.1-SNAPSHOT</version>
<name>olingo2-sample</name> <name>olingo2</name>
<description>Sample Olingo 2 Project</description> <description>Sample Olingo 2 Project</description>
<parent> <parent>

150
apache-spark/data/iris.data Normal file
View File

@ -0,0 +1,150 @@
5.1,3.5,1.4,0.2,Iris-setosa
4.9,3.0,1.4,0.2,Iris-setosa
4.7,3.2,1.3,0.2,Iris-setosa
4.6,3.1,1.5,0.2,Iris-setosa
5.0,3.6,1.4,0.2,Iris-setosa
5.4,3.9,1.7,0.4,Iris-setosa
4.6,3.4,1.4,0.3,Iris-setosa
5.0,3.4,1.5,0.2,Iris-setosa
4.4,2.9,1.4,0.2,Iris-setosa
4.9,3.1,1.5,0.1,Iris-setosa
5.4,3.7,1.5,0.2,Iris-setosa
4.8,3.4,1.6,0.2,Iris-setosa
4.8,3.0,1.4,0.1,Iris-setosa
4.3,3.0,1.1,0.1,Iris-setosa
5.8,4.0,1.2,0.2,Iris-setosa
5.7,4.4,1.5,0.4,Iris-setosa
5.4,3.9,1.3,0.4,Iris-setosa
5.1,3.5,1.4,0.3,Iris-setosa
5.7,3.8,1.7,0.3,Iris-setosa
5.1,3.8,1.5,0.3,Iris-setosa
5.4,3.4,1.7,0.2,Iris-setosa
5.1,3.7,1.5,0.4,Iris-setosa
4.6,3.6,1.0,0.2,Iris-setosa
5.1,3.3,1.7,0.5,Iris-setosa
4.8,3.4,1.9,0.2,Iris-setosa
5.0,3.0,1.6,0.2,Iris-setosa
5.0,3.4,1.6,0.4,Iris-setosa
5.2,3.5,1.5,0.2,Iris-setosa
5.2,3.4,1.4,0.2,Iris-setosa
4.7,3.2,1.6,0.2,Iris-setosa
4.8,3.1,1.6,0.2,Iris-setosa
5.4,3.4,1.5,0.4,Iris-setosa
5.2,4.1,1.5,0.1,Iris-setosa
5.5,4.2,1.4,0.2,Iris-setosa
4.9,3.1,1.5,0.1,Iris-setosa
5.0,3.2,1.2,0.2,Iris-setosa
5.5,3.5,1.3,0.2,Iris-setosa
4.9,3.1,1.5,0.1,Iris-setosa
4.4,3.0,1.3,0.2,Iris-setosa
5.1,3.4,1.5,0.2,Iris-setosa
5.0,3.5,1.3,0.3,Iris-setosa
4.5,2.3,1.3,0.3,Iris-setosa
4.4,3.2,1.3,0.2,Iris-setosa
5.0,3.5,1.6,0.6,Iris-setosa
5.1,3.8,1.9,0.4,Iris-setosa
4.8,3.0,1.4,0.3,Iris-setosa
5.1,3.8,1.6,0.2,Iris-setosa
4.6,3.2,1.4,0.2,Iris-setosa
5.3,3.7,1.5,0.2,Iris-setosa
5.0,3.3,1.4,0.2,Iris-setosa
7.0,3.2,4.7,1.4,Iris-versicolor
6.4,3.2,4.5,1.5,Iris-versicolor
6.9,3.1,4.9,1.5,Iris-versicolor
5.5,2.3,4.0,1.3,Iris-versicolor
6.5,2.8,4.6,1.5,Iris-versicolor
5.7,2.8,4.5,1.3,Iris-versicolor
6.3,3.3,4.7,1.6,Iris-versicolor
4.9,2.4,3.3,1.0,Iris-versicolor
6.6,2.9,4.6,1.3,Iris-versicolor
5.2,2.7,3.9,1.4,Iris-versicolor
5.0,2.0,3.5,1.0,Iris-versicolor
5.9,3.0,4.2,1.5,Iris-versicolor
6.0,2.2,4.0,1.0,Iris-versicolor
6.1,2.9,4.7,1.4,Iris-versicolor
5.6,2.9,3.6,1.3,Iris-versicolor
6.7,3.1,4.4,1.4,Iris-versicolor
5.6,3.0,4.5,1.5,Iris-versicolor
5.8,2.7,4.1,1.0,Iris-versicolor
6.2,2.2,4.5,1.5,Iris-versicolor
5.6,2.5,3.9,1.1,Iris-versicolor
5.9,3.2,4.8,1.8,Iris-versicolor
6.1,2.8,4.0,1.3,Iris-versicolor
6.3,2.5,4.9,1.5,Iris-versicolor
6.1,2.8,4.7,1.2,Iris-versicolor
6.4,2.9,4.3,1.3,Iris-versicolor
6.6,3.0,4.4,1.4,Iris-versicolor
6.8,2.8,4.8,1.4,Iris-versicolor
6.7,3.0,5.0,1.7,Iris-versicolor
6.0,2.9,4.5,1.5,Iris-versicolor
5.7,2.6,3.5,1.0,Iris-versicolor
5.5,2.4,3.8,1.1,Iris-versicolor
5.5,2.4,3.7,1.0,Iris-versicolor
5.8,2.7,3.9,1.2,Iris-versicolor
6.0,2.7,5.1,1.6,Iris-versicolor
5.4,3.0,4.5,1.5,Iris-versicolor
6.0,3.4,4.5,1.6,Iris-versicolor
6.7,3.1,4.7,1.5,Iris-versicolor
6.3,2.3,4.4,1.3,Iris-versicolor
5.6,3.0,4.1,1.3,Iris-versicolor
5.5,2.5,4.0,1.3,Iris-versicolor
5.5,2.6,4.4,1.2,Iris-versicolor
6.1,3.0,4.6,1.4,Iris-versicolor
5.8,2.6,4.0,1.2,Iris-versicolor
5.0,2.3,3.3,1.0,Iris-versicolor
5.6,2.7,4.2,1.3,Iris-versicolor
5.7,3.0,4.2,1.2,Iris-versicolor
5.7,2.9,4.2,1.3,Iris-versicolor
6.2,2.9,4.3,1.3,Iris-versicolor
5.1,2.5,3.0,1.1,Iris-versicolor
5.7,2.8,4.1,1.3,Iris-versicolor
6.3,3.3,6.0,2.5,Iris-virginica
5.8,2.7,5.1,1.9,Iris-virginica
7.1,3.0,5.9,2.1,Iris-virginica
6.3,2.9,5.6,1.8,Iris-virginica
6.5,3.0,5.8,2.2,Iris-virginica
7.6,3.0,6.6,2.1,Iris-virginica
4.9,2.5,4.5,1.7,Iris-virginica
7.3,2.9,6.3,1.8,Iris-virginica
6.7,2.5,5.8,1.8,Iris-virginica
7.2,3.6,6.1,2.5,Iris-virginica
6.5,3.2,5.1,2.0,Iris-virginica
6.4,2.7,5.3,1.9,Iris-virginica
6.8,3.0,5.5,2.1,Iris-virginica
5.7,2.5,5.0,2.0,Iris-virginica
5.8,2.8,5.1,2.4,Iris-virginica
6.4,3.2,5.3,2.3,Iris-virginica
6.5,3.0,5.5,1.8,Iris-virginica
7.7,3.8,6.7,2.2,Iris-virginica
7.7,2.6,6.9,2.3,Iris-virginica
6.0,2.2,5.0,1.5,Iris-virginica
6.9,3.2,5.7,2.3,Iris-virginica
5.6,2.8,4.9,2.0,Iris-virginica
7.7,2.8,6.7,2.0,Iris-virginica
6.3,2.7,4.9,1.8,Iris-virginica
6.7,3.3,5.7,2.1,Iris-virginica
7.2,3.2,6.0,1.8,Iris-virginica
6.2,2.8,4.8,1.8,Iris-virginica
6.1,3.0,4.9,1.8,Iris-virginica
6.4,2.8,5.6,2.1,Iris-virginica
7.2,3.0,5.8,1.6,Iris-virginica
7.4,2.8,6.1,1.9,Iris-virginica
7.9,3.8,6.4,2.0,Iris-virginica
6.4,2.8,5.6,2.2,Iris-virginica
6.3,2.8,5.1,1.5,Iris-virginica
6.1,2.6,5.6,1.4,Iris-virginica
7.7,3.0,6.1,2.3,Iris-virginica
6.3,3.4,5.6,2.4,Iris-virginica
6.4,3.1,5.5,1.8,Iris-virginica
6.0,3.0,4.8,1.8,Iris-virginica
6.9,3.1,5.4,2.1,Iris-virginica
6.7,3.1,5.6,2.4,Iris-virginica
6.9,3.1,5.1,2.3,Iris-virginica
5.8,2.7,5.1,1.9,Iris-virginica
6.8,3.2,5.9,2.3,Iris-virginica
6.7,3.3,5.7,2.5,Iris-virginica
6.7,3.0,5.2,2.3,Iris-virginica
6.3,2.5,5.0,1.9,Iris-virginica
6.5,3.0,5.2,2.0,Iris-virginica
6.2,3.4,5.4,2.3,Iris-virginica
5.9,3.0,5.1,1.8,Iris-virginica

BIN
apache-spark/model/logistic-regression/data/._SUCCESS.crc Normal file
View File

Binary file not shown.

BIN
apache-spark/model/logistic-regression/data/.part-00000-f3a3ee61-f200-41ff-80d9-8e1edf399601-c000.snappy.parquet.crc Normal file
View File

Binary file not shown.

0
spring-cloud-data-flow/etl/customer-mongodb-sink/src/main/resources/application.properties → apache-spark/model/logistic-regression/data/_SUCCESS
View File

BIN
apache-spark/model/logistic-regression/data/part-00000-f3a3ee61-f200-41ff-80d9-8e1edf399601-c000.snappy.parquet Normal file
View File

Binary file not shown.

BIN
apache-spark/model/logistic-regression/metadata/._SUCCESS.crc Normal file
View File

Binary file not shown.

BIN
apache-spark/model/logistic-regression/metadata/.part-00000.crc Normal file
View File

Binary file not shown.

0
spring-cloud-data-flow/etl/customer-transform/src/main/resources/application.properties → apache-spark/model/logistic-regression/metadata/_SUCCESS
View File

1
apache-spark/model/logistic-regression/metadata/part-00000 Normal file
View File

@ -0,0 +1 @@
{"class":"org.apache.spark.mllib.classification.LogisticRegressionModel","version":"1.0","numFeatures":4,"numClasses":3}

132
apache-spark/pom.xml
View File

@ -1,31 +1,32 @@
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" <project xmlns="http://maven.apache.org/POM/4.0.0"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"> xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
<modelVersion>4.0.0</modelVersion> xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<groupId>com.baeldung</groupId> <modelVersion>4.0.0</modelVersion>
<artifactId>apache-spark</artifactId> <groupId>com.baeldung</groupId>
<version>1.0-SNAPSHOT</version> <artifactId>apache-spark</artifactId>
<name>apache-spark</name> <version>1.0-SNAPSHOT</version>
<packaging>jar</packaging> <name>apache-spark</name>
<url>http://maven.apache.org</url> <packaging>jar</packaging>
<url>http://maven.apache.org</url>
<parent> <parent>
<groupId>com.baeldung</groupId> <groupId>com.baeldung</groupId>
<artifactId>parent-modules</artifactId> <artifactId>parent-modules</artifactId>
<version>1.0.0-SNAPSHOT</version> <version>1.0.0-SNAPSHOT</version>
</parent> </parent>
<dependencies> <dependencies>
<dependency>
<groupId>org.apache.spark</groupId>
<artifactId>spark-core_2.11</artifactId>
<version>${org.apache.spark.spark-core.version}</version>
<scope>provided</scope>
</dependency>
<dependency> <dependency>
<groupId>org.apache.spark</groupId> <groupId>org.apache.spark</groupId>
<artifactId>spark-sql_2.11</artifactId> <artifactId>spark-core_2.11</artifactId>
<version>${org.apache.spark.spark-sql.version}</version> <version>${org.apache.spark.spark-core.version}</version>
<scope>provided</scope> <scope>provided</scope>
</dependency>
<dependency>
<groupId>org.apache.spark</groupId>
<artifactId>spark-sql_2.11</artifactId>
<version>${org.apache.spark.spark-sql.version}</version>
<scope>provided</scope>
</dependency> </dependency>
<dependency> <dependency>
<groupId>org.apache.spark</groupId> <groupId>org.apache.spark</groupId>
@ -33,6 +34,12 @@
<version>${org.apache.spark.spark-streaming.version}</version> <version>${org.apache.spark.spark-streaming.version}</version>
<scope>provided</scope> <scope>provided</scope>
</dependency> </dependency>
<dependency>
<groupId>org.apache.spark</groupId>
<artifactId>spark-mllib_2.11</artifactId>
<version>${org.apache.spark.spark-mllib.version}</version>
<scope>provided</scope>
</dependency>
<dependency> <dependency>
<groupId>org.apache.spark</groupId> <groupId>org.apache.spark</groupId>
<artifactId>spark-streaming-kafka-0-10_2.11</artifactId> <artifactId>spark-streaming-kafka-0-10_2.11</artifactId>
@ -48,46 +55,47 @@
<artifactId>spark-cassandra-connector-java_2.11</artifactId> <artifactId>spark-cassandra-connector-java_2.11</artifactId>
<version>${com.datastax.spark.spark-cassandra-connector-java.version}</version> <version>${com.datastax.spark.spark-cassandra-connector-java.version}</version>
</dependency> </dependency>
</dependencies> </dependencies>
<build> <build>
<plugins> <plugins>
<plugin> <plugin>
<groupId>org.apache.maven.plugins</groupId> <groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId> <artifactId>maven-compiler-plugin</artifactId>
<version>${maven-compiler-plugin.version}</version> <version>${maven-compiler-plugin.version}</version>
<configuration> <configuration>
<source>${java.version}</source> <source>${java.version}</source>
<target>${java.version}</target> <target>${java.version}</target>
</configuration> </configuration>
</plugin> </plugin>
<plugin> <plugin>
<artifactId>maven-assembly-plugin</artifactId> <artifactId>maven-assembly-plugin</artifactId>
<executions> <executions>
<execution> <execution>
<phase>package</phase> <phase>package</phase>
<goals> <goals>
<goal>single</goal> <goal>single</goal>
</goals> </goals>
</execution> </execution>
</executions> </executions>
<configuration> <configuration>
<descriptorRefs> <descriptorRefs>
<descriptorRef>jar-with-dependencies</descriptorRef> <descriptorRef>jar-with-dependencies</descriptorRef>
</descriptorRefs> </descriptorRefs>
</configuration> </configuration>
</plugin> </plugin>
</plugins> </plugins>
</build> </build>
<properties> <properties>
<org.apache.spark.spark-core.version>2.3.0</org.apache.spark.spark-core.version> <org.apache.spark.spark-core.version>2.3.0</org.apache.spark.spark-core.version>
<org.apache.spark.spark-sql.version>2.3.0</org.apache.spark.spark-sql.version> <org.apache.spark.spark-sql.version>2.3.0</org.apache.spark.spark-sql.version>
<org.apache.spark.spark-streaming.version>2.3.0</org.apache.spark.spark-streaming.version> <org.apache.spark.spark-streaming.version>2.3.0</org.apache.spark.spark-streaming.version>
<org.apache.spark.spark-streaming-kafka.version>2.3.0</org.apache.spark.spark-streaming-kafka.version> <org.apache.spark.spark-mllib.version>2.3.0</org.apache.spark.spark-mllib.version>
<com.datastax.spark.spark-cassandra-connector.version>2.3.0</com.datastax.spark.spark-cassandra-connector.version> <org.apache.spark.spark-streaming-kafka.version>2.3.0</org.apache.spark.spark-streaming-kafka.version>
<com.datastax.spark.spark-cassandra-connector-java.version>1.5.2</com.datastax.spark.spark-cassandra-connector-java.version> <com.datastax.spark.spark-cassandra-connector.version>2.3.0</com.datastax.spark.spark-cassandra-connector.version>
<com.datastax.spark.spark-cassandra-connector-java.version>1.5.2</com.datastax.spark.spark-cassandra-connector-java.version>
<maven-compiler-plugin.version>3.2</maven-compiler-plugin.version> <maven-compiler-plugin.version>3.2</maven-compiler-plugin.version>
</properties> </properties>
</project> </project>

111
apache-spark/src/main/java/com/baeldung/ml/MachineLearningApp.java Normal file
View File

@ -0,0 +1,111 @@
package com.baeldung.ml;
import java.util.HashMap;
import java.util.Map;
import org.apache.log4j.Level;
import org.apache.log4j.Logger;
import org.apache.spark.SparkConf;
import org.apache.spark.api.java.JavaPairRDD;
import org.apache.spark.api.java.JavaRDD;
import org.apache.spark.api.java.JavaSparkContext;
import org.apache.spark.mllib.classification.LogisticRegressionModel;
import org.apache.spark.mllib.classification.LogisticRegressionWithLBFGS;
import org.apache.spark.mllib.evaluation.MulticlassMetrics;
import org.apache.spark.mllib.linalg.Matrix;
import org.apache.spark.mllib.linalg.Vector;
import org.apache.spark.mllib.linalg.Vectors;
import org.apache.spark.mllib.regression.LabeledPoint;
import org.apache.spark.mllib.stat.MultivariateStatisticalSummary;
import org.apache.spark.mllib.stat.Statistics;
import scala.Tuple2;
public class MachineLearningApp {
public static void main(String[] args) {
// 1. Setting the Spark Context
SparkConf conf = new SparkConf().setAppName("Main")
.setMaster("local[2]")
.set("spark.executor.memory", "3g")
.set("spark.driver.memory", "3g");
JavaSparkContext sc = new JavaSparkContext(conf);
Logger.getLogger("org")
.setLevel(Level.OFF);
Logger.getLogger("akka")
.setLevel(Level.OFF);
// 2. Loading the Data-set
String dataFile = "data\\iris.data";
JavaRDD<String> data = sc.textFile(dataFile);
// 3. Exploratory Data Analysis
// 3.1. Creating Vector of Input Data
JavaRDD<Vector> inputData = data.map(line -> {
String[] parts = line.split(",");
double[] v = new double[parts.length - 1];
for (int i = 0; i < parts.length - 1; i++) {
v[i] = Double.parseDouble(parts[i]);
}
return Vectors.dense(v);
});
// 3.2. Performing Statistical Analysis
MultivariateStatisticalSummary summary = Statistics.colStats(inputData.rdd());
System.out.println("Summary Mean:");
System.out.println(summary.mean());
System.out.println("Summary Variance:");
System.out.println(summary.variance());
System.out.println("Summary Non-zero:");
System.out.println(summary.numNonzeros());
// 3.3. Performing Correlation Analysis
Matrix correlMatrix = Statistics.corr(inputData.rdd(), "pearson");
System.out.println("Correlation Matrix:");
System.out.println(correlMatrix.toString());
// 4. Data Preparation
// 4.1. Creating Map for Textual Output Labels
Map<String, Integer> map = new HashMap<String, Integer>();
map.put("Iris-setosa", 0);
map.put("Iris-versicolor", 1);
map.put("Iris-virginica", 2);
// 4.2. Creating LabeledPoint of Input and Output Data
JavaRDD<LabeledPoint> parsedData = data.map(line -> {
String[] parts = line.split(",");
double[] v = new double[parts.length - 1];
for (int i = 0; i < parts.length - 1; i++) {
v[i] = Double.parseDouble(parts[i]);
}
return new LabeledPoint(map.get(parts[parts.length - 1]), Vectors.dense(v));
});
// 5. Data Splitting into 80% Training and 20% Test Sets
JavaRDD<LabeledPoint>[] splits = parsedData.randomSplit(new double[] { 0.8, 0.2 }, 11L);
JavaRDD<LabeledPoint> trainingData = splits[0].cache();
JavaRDD<LabeledPoint> testData = splits[1];
// 6. Modeling
// 6.1. Model Training
LogisticRegressionModel model = new LogisticRegressionWithLBFGS().setNumClasses(3)
.run(trainingData.rdd());
// 6.2. Model Evaluation
JavaPairRDD<Object, Object> predictionAndLabels = testData.mapToPair(p -> new Tuple2<>(model.predict(p.features()), p.label()));
MulticlassMetrics metrics = new MulticlassMetrics(predictionAndLabels.rdd());
double accuracy = metrics.accuracy();
System.out.println("Model Accuracy on Test Data: " + accuracy);
// 7. Model Saving and Loading
// 7.1. Model Saving
model.save(sc.sc(), "model\\logistic-regression");
// 7.2. Model Loading
LogisticRegressionModel sameModel = LogisticRegressionModel.load(sc.sc(), "model\\logistic-regression");
// 7.3. Prediction on New Data
Vector newData = Vectors.dense(new double[] { 1, 1, 1, 1 });
double prediction = sameModel.predict(newData);
System.out.println("Model Prediction on New Data = " + prediction);
// 8. Clean-up
sc.close();
}
}

3
bazel/README.md Normal file
View File

@ -0,0 +1,3 @@
## Relevant Articles:
- [Building Java Applications with Bazel](https://www.baeldung.com/bazel-build-tool)

31
bazel/WORKSPACE Normal file
View File

@ -0,0 +1,31 @@
load("@bazel_tools//tools/build_defs/repo:http.bzl", "http_jar")
load("@bazel_tools//tools/build_defs/repo:http.bzl", "http_archive")
RULES_JVM_EXTERNAL_TAG = "2.0.1"
RULES_JVM_EXTERNAL_SHA = "55e8d3951647ae3dffde22b4f7f8dee11b3f70f3f89424713debd7076197eaca"
http_archive(
name = "rules_jvm_external",
strip_prefix = "rules_jvm_external-%s" % RULES_JVM_EXTERNAL_TAG,
sha256 = RULES_JVM_EXTERNAL_SHA,
url = "https://github.com/bazelbuild/rules_jvm_external/archive/%s.zip" % RULES_JVM_EXTERNAL_TAG,
)
load("@rules_jvm_external//:defs.bzl", "maven_install")
maven_install(
artifacts = [
"org.apache.commons:commons-lang3:3.9"
],
repositories = [
"https://repo1.maven.org/maven2",
]
)
http_jar (
name = "apache-commons-lang",
url = "https://repo1.maven.org/maven2/org/apache/commons/commons-lang3/3.9/commons-lang3-3.9.jar"
)

7
bazel/bazelapp/BUILD Normal file
View File

@ -0,0 +1,7 @@
java_binary (
name = "BazelApp",
srcs = glob(["src/main/java/com/baeldung/*.java"]),
main_class = "com.baeldung.BazelApp",
deps = ["//bazelgreeting:greeter", "@maven//:org_apache_commons_commons_lang3"]
)

29
bazel/bazelapp/pom.xml Normal file
View File

@ -0,0 +1,29 @@
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<artifactId>bazelapp</artifactId>
<name>bazelapp</name>
<parent>
<artifactId>bazel</artifactId>
<groupId>com.baeldung</groupId>
<version>1.0.0-SNAPSHOT</version>
</parent>
<dependencies>
<dependency>
<groupId>com.baeldung</groupId>
<artifactId>bazelgreeting</artifactId>
<version>1.0.0-SNAPSHOT</version>
</dependency>
<dependency>
<groupId>org.apache.commons</groupId>
<artifactId>commons-lang3</artifactId>
<version>3.9</version>
</dependency>
</dependencies>
</project>

15
bazel/bazelapp/src/main/java/com/baeldung/BazelApp.java Normal file
View File

@ -0,0 +1,15 @@
package com.baeldung;
import com.baeldung.Greetings;
import org.apache.commons.lang3.StringUtils;
public class BazelApp {
public static void main(String ... args) {
Greetings greetings = new Greetings();
System.out.println(greetings.greet("Bazel"));
System.out.println(StringUtils.lowerCase("Bazel"));
}
}

6
bazel/bazelgreeting/BUILD Normal file
View File

@ -0,0 +1,6 @@
java_library (
name = "greeter",
srcs = glob(["src/main/java/com/baeldung/*.java"]),
visibility = ["//bazelapp:__pkg__"]
)

16
bazel/bazelgreeting/pom.xml Normal file
View File

@ -0,0 +1,16 @@
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<artifactId>bazelgreeting</artifactId>
<name>bazelgreeting</name>
<parent>
<artifactId>bazel</artifactId>
<groupId>com.baeldung</groupId>
<version>1.0.0-SNAPSHOT</version>
</parent>
</project>

8
bazel/bazelgreeting/src/main/java/com/baeldung/Greetings.java Normal file
View File

@ -0,0 +1,8 @@
package com.baeldung;
public class Greetings {
public String greet(String name) {
return "Hello ".concat(name);
}
}

22
bazel/pom.xml Normal file
View File

@ -0,0 +1,22 @@
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<artifactId>bazel</artifactId>
<packaging>pom</packaging>
<name>bazel</name>
<parent>
<artifactId>parent-modules</artifactId>
<groupId>com.baeldung</groupId>
<version>1.0.0-SNAPSHOT</version>
</parent>
<modules>
<module>bazelgreeting</module>
<module>bazelapp</module>
</modules>
</project>

1
core-groovy-2/README.md
View File

@ -8,3 +8,4 @@
- [Pattern Matching in Strings in Groovy](https://www.baeldung.com/groovy-pattern-matching) - [Pattern Matching in Strings in Groovy](https://www.baeldung.com/groovy-pattern-matching)
- [Working with XML in Groovy](https://www.baeldung.com/groovy-xml) - [Working with XML in Groovy](https://www.baeldung.com/groovy-xml)
- [Integrating Groovy into Java Applications](https://www.baeldung.com/groovy-java-applications) - [Integrating Groovy into Java Applications](https://www.baeldung.com/groovy-java-applications)
- [Concatenate Strings with Groovy](https://www.baeldung.com/groovy-concatenate-strings)

45
core-groovy-2/src/main/groovy/com/baeldung/metaprogramming/Employee.groovy Normal file
View File

@ -0,0 +1,45 @@
package com.baeldung.metaprogramming
import groovy.transform.AutoClone
import groovy.transform.Canonical
import groovy.transform.EqualsAndHashCode
import groovy.transform.ToString
import groovy.transform.TupleConstructor
import groovy.util.logging.*
@Canonical
@TupleConstructor
@EqualsAndHashCode
@ToString(includePackage=false, excludes=['id'])
@Log
@AutoClone
class Employee {
long id
String firstName
String lastName
int age
//method to catch missing property's getter
def propertyMissing(String propertyName) {
log.info "$propertyName is not available"
"property '$propertyName' is not available"
}
//method to catch missing property's setter
def propertyMissing(String propertyName, propertyValue) {
println "property '$propertyName' is not available"
log.info "$propertyName is not available"
"property '$propertyName' is not available"
}
def methodMissing(String methodName, def methodArgs) {
log.info "$methodName is not defined"
"method '$methodName' is not defined"
}
def logEmp() {
log.info "Employee: $lastName, $firstName is of $age years age"
}
}

30
core-groovy-2/src/main/groovy/com/baeldung/metaprogramming/extension/BasicExtensions.groovy Normal file
View File

@ -0,0 +1,30 @@
package com.baeldung.metaprogramming.extension
import com.baeldung.metaprogramming.Employee
class BasicExtensions {
static int getYearOfBirth(Employee self) {
return (new Date().getYear() + 1900) - self.age;
}
static String capitalize(String self) {
return self.substring(0, 1).toUpperCase() + self.substring(1)
}
static void printCounter(Integer self) {
while (self>0) {
println self
self--
}
}
static Long square(Long self) {
return self*self
}
static BigDecimal cube(BigDecimal self) {
return self*self*self
}
}

10
core-groovy-2/src/main/groovy/com/baeldung/metaprogramming/extension/StaticEmployeeExtension.groovy Normal file
View File

@ -0,0 +1,10 @@
package com.baeldung.metaprogramming.extension
import com.baeldung.metaprogramming.Employee
class StaticEmployeeExtension {
static Employee getDefaultObj(Employee self) {
return new Employee(firstName: "firstName", lastName: "lastName", age: 20)
}
}

4
core-groovy-2/src/main/resources/META-INF/services/org.codehaus.groovy.runtime.ExtensionModule Normal file
View File

@ -0,0 +1,4 @@
moduleName=core-groovy-2
moduleVersion=1.0-SNAPSHOT
extensionClasses=com.baeldung.metaprogramming.extension.BasicExtensions
staticExtensionClasses=com.baeldung.metaprogramming.extension.StaticEmployeeExtension

118
core-groovy-2/src/test/groovy/com/baeldung/metaprogramming/MetaprogrammingUnitTest.groovy Normal file
View File

@ -0,0 +1,118 @@
package com.baeldung.metaprogramming
import groovy.time.TimeCategory
class MetaprogrammingUnitTest extends GroovyTestCase {
Employee emp = new Employee(firstName: "Norman", lastName: "Lewis")
void testPropertyMissing() {
assert emp.address == "property 'address' is not available"
}
void testMethodMissing() {
Employee emp = new Employee()
try {
emp.getFullName()
} catch(MissingMethodException e) {
println "method is not defined"
}
assert emp.getFullName() == "method 'getFullName' is not defined"
}
void testMetaClassProperty() {
Employee.metaClass.address = ""
emp = new Employee(firstName: "Norman", lastName: "Lewis", address: "US")
assert emp.address == "US"
}
void testMetaClassMethod() {
emp.metaClass.getFullName = {
"$lastName, $firstName"
}
assert emp.getFullName() == "Lewis, Norman"
}
void testMetaClassConstructor() {
try {
Employee emp = new Employee("Norman")
} catch(GroovyRuntimeException e) {
assert e.message == "Could not find matching constructor for: com.baeldung.metaprogramming.Employee(String)"
}
Employee.metaClass.constructor = { String firstName ->
new Employee(firstName: firstName)
}
Employee norman = new Employee("Norman")
assert norman.firstName == "Norman"
assert norman.lastName == null
}
void testJavaMetaClass() {
String.metaClass.capitalize = { String str ->
str.substring(0, 1).toUpperCase() + str.substring(1);
}
assert "norman".capitalize() == "Norman"
}
void testEmployeeExtension() {
Employee emp = new Employee(age: 28)
assert emp.getYearOfBirth() == 1991
}
void testJavaClassesExtensions() {
5.printCounter()
assert 40l.square() == 1600l
assert (2.98).cube() == 26.463592
}
void testStaticEmployeeExtension() {
assert Employee.getDefaultObj().firstName == "firstName"
assert Employee.getDefaultObj().lastName == "lastName"
assert Employee.getDefaultObj().age == 20
}
void testToStringAnnotation() {
Employee employee = new Employee()
employee.id = 1
employee.firstName = "norman"
employee.lastName = "lewis"
employee.age = 28
assert employee.toString() == "Employee(norman, lewis, 28)"
}
void testTupleConstructorAnnotation() {
Employee norman = new Employee(1, "norman", "lewis", 28)
assert norman.toString() == "Employee(norman, lewis, 28)"
Employee snape = new Employee(2, "snape")
assert snape.toString() == "Employee(snape, null, 0)"
}
void testEqualsAndHashCodeAnnotation() {
Employee norman = new Employee(1, "norman", "lewis", 28)
Employee normanCopy = new Employee(1, "norman", "lewis", 28)
assert norman.equals(normanCopy)
assert norman.hashCode() == normanCopy.hashCode()
}
void testAutoCloneAnnotation() {
try {
Employee norman = new Employee(1, "norman", "lewis", 28)
def normanCopy = norman.clone()
assert norman == normanCopy
} catch(CloneNotSupportedException e) {
e.printStackTrace()
}
}
void testLoggingAnnotation() {
Employee employee = new Employee(1, "Norman", "Lewis", 28)
employee.logEmp()
}
}

3
core-java-modules/core-java-12/README.md
View File

@ -1,3 +1,4 @@
## Relevant articles: ## Relevant Articles:
- [String API Updates in Java 12](https://www.baeldung.com/java12-string-api) - [String API Updates in Java 12](https://www.baeldung.com/java12-string-api)

1
core-java-modules/core-java-8-2/README.md
View File

@ -7,3 +7,4 @@
- [How to Delay Code Execution in Java](https://www.baeldung.com/java-delay-code-execution) - [How to Delay Code Execution in Java](https://www.baeldung.com/java-delay-code-execution)
- [Run JAR Application With Command Line Arguments](https://www.baeldung.com/java-run-jar-with-arguments) - [Run JAR Application With Command Line Arguments](https://www.baeldung.com/java-run-jar-with-arguments)
- [Java 8 Stream skip() vs limit()](https://www.baeldung.com/java-stream-skip-vs-limit) - [Java 8 Stream skip() vs limit()](https://www.baeldung.com/java-stream-skip-vs-limit)
- [Guide to Java BiFunction Interface](https://www.baeldung.com/java-bifunction-interface)

5
core-java-modules/core-java-8/README.md
View File

@ -4,14 +4,10 @@
### Relevant Articles: ### Relevant Articles:
- [Guide to Java 8’s Collectors](http://www.baeldung.com/java-8-collectors) - [Guide to Java 8’s Collectors](http://www.baeldung.com/java-8-collectors)
- [Functional Interfaces in Java 8](http://www.baeldung.com/java-8-functional-interfaces)
- [Java 8 – Powerful Comparison with Lambdas](http://www.baeldung.com/java-8-sort-lambda)
- [New Features in Java 8](http://www.baeldung.com/java-8-new-features) - [New Features in Java 8](http://www.baeldung.com/java-8-new-features)
- [Lambda Expressions and Functional Interfaces: Tips and Best Practices](http://www.baeldung.com/java-8-lambda-expressions-tips)
- [The Double Colon Operator in Java 8](http://www.baeldung.com/java-8-double-colon-operator) - [The Double Colon Operator in Java 8](http://www.baeldung.com/java-8-double-colon-operator)
- [Guide to Java 8 groupingBy Collector](http://www.baeldung.com/java-groupingby-collector) - [Guide to Java 8 groupingBy Collector](http://www.baeldung.com/java-groupingby-collector)
- [Strategy Design Pattern in Java 8](http://www.baeldung.com/java-strategy-pattern) - [Strategy Design Pattern in Java 8](http://www.baeldung.com/java-strategy-pattern)
- [Exceptions in Java 8 Lambda Expressions](http://www.baeldung.com/java-lambda-exceptions)
- [Guide to Java 8 Comparator.comparing()](http://www.baeldung.com/java-8-comparator-comparing) - [Guide to Java 8 Comparator.comparing()](http://www.baeldung.com/java-8-comparator-comparing)
- [Guide To Java 8 Optional](http://www.baeldung.com/java-optional) - [Guide To Java 8 Optional](http://www.baeldung.com/java-optional)
- [Guide to the Java 8 forEach](http://www.baeldung.com/foreach-java) - [Guide to the Java 8 forEach](http://www.baeldung.com/foreach-java)
@ -38,6 +34,5 @@
- [Java @SafeVarargs Annotation](https://www.baeldung.com/java-safevarargs) - [Java @SafeVarargs Annotation](https://www.baeldung.com/java-safevarargs)
- [Java @Deprecated Annotation](https://www.baeldung.com/java-deprecated) - [Java @Deprecated Annotation](https://www.baeldung.com/java-deprecated)
- [Java 8 Predicate Chain](https://www.baeldung.com/java-predicate-chain) - [Java 8 Predicate Chain](https://www.baeldung.com/java-predicate-chain)
- [Method References in Java](https://www.baeldung.com/java-method-references)
- [Creating a Custom Annotation in Java](https://www.baeldung.com/java-custom-annotation) - [Creating a Custom Annotation in Java](https://www.baeldung.com/java-custom-annotation)
- [The Difference Between Collection.stream().forEach() and Collection.forEach()](https://www.baeldung.com/java-collection-stream-foreach) - [The Difference Between Collection.stream().forEach() and Collection.forEach()](https://www.baeldung.com/java-collection-stream-foreach)

2
core-java-modules/core-java-arrays-2/README.MD
View File

@ -1,3 +1,5 @@
## Relevant Articles ## Relevant Articles
- [Extending an Array’s Length](https://www.baeldung.com/java-array-add-element-at-the-end) - [Extending an Array’s Length](https://www.baeldung.com/java-array-add-element-at-the-end)
- [Checking If an Array Is Sorted in Java](https://www.baeldung.com/java-check-sorted-array)
- [Looping Diagonally Through a 2d Java Array](https://www.baeldung.com/java-loop-diagonal-array)

3
core-java-modules/core-java-arrays/README.md
View File

@ -7,7 +7,7 @@
- [Check if a Java Array Contains a Value](http://www.baeldung.com/java-array-contains-value) - [Check if a Java Array Contains a Value](http://www.baeldung.com/java-array-contains-value)
- [Initializing Arrays in Java](http://www.baeldung.com/java-initialize-array) - [Initializing Arrays in Java](http://www.baeldung.com/java-initialize-array)
- [Guide to the java.util.Arrays Class](http://www.baeldung.com/java-util-arrays) - [Guide to the java.util.Arrays Class](http://www.baeldung.com/java-util-arrays)
- [Jagged Arrays In Java](http://www.baeldung.com/java-jagged-arrays) - [Multi-Dimensional Arrays In Java](http://www.baeldung.com/java-jagged-arrays)
- [Find Sum and Average in a Java Array](http://www.baeldung.com/java-array-sum-average) - [Find Sum and Average in a Java Array](http://www.baeldung.com/java-array-sum-average)
- [Arrays in Java: A Reference Guide](https://www.baeldung.com/java-arrays-guide) - [Arrays in Java: A Reference Guide](https://www.baeldung.com/java-arrays-guide)
- [How to Invert an Array in Java](http://www.baeldung.com/java-invert-array) - [How to Invert an Array in Java](http://www.baeldung.com/java-invert-array)
@ -16,3 +16,4 @@
- [Sorting Arrays in Java](https://www.baeldung.com/java-sorting-arrays) - [Sorting Arrays in Java](https://www.baeldung.com/java-sorting-arrays)
- [Convert a Float to a Byte Array in Java](https://www.baeldung.com/java-convert-float-to-byte-array) - [Convert a Float to a Byte Array in Java](https://www.baeldung.com/java-convert-float-to-byte-array)
- [Converting Between Stream and Array in Java](https://www.baeldung.com/java-stream-to-array) - [Converting Between Stream and Array in Java](https://www.baeldung.com/java-stream-to-array)
- [Removing an Element from an Array in Java](https://www.baeldung.com/java-array-remove-element)

12
core-java-modules/core-java-concurrency-basic/src/main/java/com/baeldung/concurrent/mutex/SequenceGenerator.java Normal file
View File

@ -0,0 +1,12 @@
package com.baeldung.concurrent.mutex;
public class SequenceGenerator {
private int currentValue = 0;
public int getNextSequence() {
currentValue = currentValue + 1;
return currentValue;
}
}

19
core-java-modules/core-java-concurrency-basic/src/main/java/com/baeldung/concurrent/mutex/SequenceGeneratorUsingMonitor.java Normal file
View File

@ -0,0 +1,19 @@
package com.baeldung.concurrent.mutex;
import com.google.common.util.concurrent.Monitor;
public class SequenceGeneratorUsingMonitor extends SequenceGenerator {
private Monitor mutex = new Monitor();
@Override
public int getNextSequence() {
mutex.enter();
try {
return super.getNextSequence();
} finally {
mutex.leave();
}
}
}

19
core-java-modules/core-java-concurrency-basic/src/main/java/com/baeldung/concurrent/mutex/SequenceGeneratorUsingReentrantLock.java Normal file
View File

@ -0,0 +1,19 @@
package com.baeldung.concurrent.mutex;
import java.util.concurrent.locks.ReentrantLock;
public class SequenceGeneratorUsingReentrantLock extends SequenceGenerator {
private ReentrantLock mutex = new ReentrantLock();
@Override
public int getNextSequence() {
try {
mutex.lock();
return super.getNextSequence();
} finally {
mutex.unlock();
}
}
}

21
core-java-modules/core-java-concurrency-basic/src/main/java/com/baeldung/concurrent/mutex/SequenceGeneratorUsingSemaphore.java Normal file
View File

@ -0,0 +1,21 @@
package com.baeldung.concurrent.mutex;
import java.util.concurrent.Semaphore;
public class SequenceGeneratorUsingSemaphore extends SequenceGenerator {
private Semaphore mutex = new Semaphore(1);
@Override
public int getNextSequence() {
try {
mutex.acquire();
return super.getNextSequence();
} catch (InterruptedException e) {
throw new RuntimeException("Exception in critical section.", e);
} finally {
mutex.release();
}
}
}

14
core-java-modules/core-java-concurrency-basic/src/main/java/com/baeldung/concurrent/mutex/SequenceGeneratorUsingSynchronizedBlock.java Normal file
View File

@ -0,0 +1,14 @@
package com.baeldung.concurrent.mutex;
public class SequenceGeneratorUsingSynchronizedBlock extends SequenceGenerator {
private Object mutex = new Object();
@Override
public int getNextSequence() {
synchronized (mutex) {
return super.getNextSequence();
}
}
}

10
core-java-modules/core-java-concurrency-basic/src/main/java/com/baeldung/concurrent/mutex/SequenceGeneratorUsingSynchronizedMethod.java Normal file
View File

@ -0,0 +1,10 @@
package com.baeldung.concurrent.mutex;
public class SequenceGeneratorUsingSynchronizedMethod extends SequenceGenerator {
@Override
public synchronized int getNextSequence() {
return super.getNextSequence();
}
}

2
core-java-modules/core-java-concurrency-basic/src/test/java/com/baeldung/java8/Java8ExecutorServiceIntegrationTest.java → core-java-modules/core-java-concurrency-basic/src/test/java/com/baeldung/concurrent/executorservice/Java8ExecutorServiceIntegrationTest.java
View File

@ -1,4 +1,4 @@
package com.baeldung.java8; package com.baeldung.concurrent.executorservice;
import static org.junit.Assert.assertEquals; import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertFalse; import static org.junit.Assert.assertFalse;

80
core-java-modules/core-java-concurrency-basic/src/test/java/com/baeldung/concurrent/mutex/MutexUnitTest.java Normal file
View File

@ -0,0 +1,80 @@
package com.baeldung.concurrent.mutex;
import java.util.ArrayList;
import java.util.LinkedHashSet;
import java.util.List;
import java.util.Set;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.Future;
import java.util.concurrent.TimeUnit;
import org.junit.Assert;
import org.junit.Test;
public class MutexUnitTest {
// @Test
// This test verifies the race condition use case, it may pass or fail based on execution environment
// Uncomment @Test to run it
public void givenUnsafeSequenceGenerator_whenRaceCondition_thenUnexpectedBehavior() throws Exception {
int count = 1000;
Set<Integer> uniqueSequences = getUniqueSequences(new SequenceGenerator(), count);
Assert.assertNotEquals(count, uniqueSequences.size());
}
@Test
public void givenSequenceGeneratorUsingSynchronizedMethod_whenRaceCondition_thenSuccess() throws Exception {
int count = 1000;
Set<Integer> uniqueSequences = getUniqueSequences(new SequenceGeneratorUsingSynchronizedMethod(), count);
Assert.assertEquals(count, uniqueSequences.size());
}
@Test
public void givenSequenceGeneratorUsingSynchronizedBlock_whenRaceCondition_thenSuccess() throws Exception {
int count = 1000;
Set<Integer> uniqueSequences = getUniqueSequences(new SequenceGeneratorUsingSynchronizedBlock(), count);
Assert.assertEquals(count, uniqueSequences.size());
}
@Test
public void givenSequenceGeneratorUsingReentrantLock_whenRaceCondition_thenSuccess() throws Exception {
int count = 1000;
Set<Integer> uniqueSequences = getUniqueSequences(new SequenceGeneratorUsingReentrantLock(), count);
Assert.assertEquals(count, uniqueSequences.size());
}
@Test
public void givenSequenceGeneratorUsingSemaphore_whenRaceCondition_thenSuccess() throws Exception {
int count = 1000;
Set<Integer> uniqueSequences = getUniqueSequences(new SequenceGeneratorUsingSemaphore(), count);
Assert.assertEquals(count, uniqueSequences.size());
}
@Test
public void givenSequenceGeneratorUsingMonitor_whenRaceCondition_thenSuccess() throws Exception {
int count = 1000;
Set<Integer> uniqueSequences = getUniqueSequences(new SequenceGeneratorUsingMonitor(), count);
Assert.assertEquals(count, uniqueSequences.size());
}
private Set<Integer> getUniqueSequences(SequenceGenerator generator, int count) throws Exception {
ExecutorService executor = Executors.newFixedThreadPool(3);
Set<Integer> uniqueSequences = new LinkedHashSet<>();
List<Future<Integer>> futures = new ArrayList<>();
for (int i = 0; i < count; i++) {
futures.add(executor.submit(generator::getNextSequence));
}
for (Future<Integer> future : futures) {
uniqueSequences.add(future.get());
}
executor.awaitTermination(1, TimeUnit.SECONDS);
executor.shutdown();
return uniqueSequences;
}
}

2
core-java-modules/core-java-exceptions/README.md
View File

@ -1,3 +1,3 @@
## Relevant articles: ## Relevant Articles:
- [Will an Error Be Caught by Catch Block in Java?](https://www.baeldung.com/java-error-catch) - [Will an Error Be Caught by Catch Block in Java?](https://www.baeldung.com/java-error-catch)

43
core-java-modules/core-java-exceptions/src/main/java/com/baeldung/exceptions/CheckedUncheckedExceptions.java Normal file
View File

@ -0,0 +1,43 @@
package com.baeldung.exceptions;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
public class CheckedUncheckedExceptions {
public static void checkedExceptionWithThrows() throws FileNotFoundException {
File file = new File("not_existing_file.txt");
FileInputStream stream = new FileInputStream(file);
}
public static void checkedExceptionWithTryCatch() {
File file = new File("not_existing_file.txt");
try {
FileInputStream stream = new FileInputStream(file);
} catch (FileNotFoundException e) {
e.printStackTrace();
}
}
public static int divideByZero() {
int numerator = 1;
int denominator = 0;
return numerator / denominator;
}
public static void checkFile(String fileName) throws IncorrectFileNameException {
if (fileName == null || fileName.isEmpty()) {
throw new NullOrEmptyException("The filename is null.");
}
if (!isCorrectFileName(fileName)) {
throw new IncorrectFileNameException("Incorrect filename : " + fileName);
}
}
private static boolean isCorrectFileName(String fileName) {
if (fileName.equals("wrongFileName.txt"))
return false;
else
return true;
}
}

13
core-java-modules/core-java-exceptions/src/main/java/com/baeldung/exceptions/IncorrectFileNameException.java Normal file
View File

@ -0,0 +1,13 @@
package com.baeldung.exceptions;
public class IncorrectFileNameException extends Exception {
private static final long serialVersionUID = 1L;
public IncorrectFileNameException(String errorMessage) {
super(errorMessage);
}
public IncorrectFileNameException(String errorMessage, Throwable thr) {
super(errorMessage, thr);
}
}

14
core-java-modules/core-java-exceptions/src/main/java/com/baeldung/exceptions/NullOrEmptyException.java Normal file
View File

@ -0,0 +1,14 @@
package com.baeldung.exceptions;
public class NullOrEmptyException extends RuntimeException {
private static final long serialVersionUID = 1L;
public NullOrEmptyException(String errorMessage) {
super(errorMessage);
}
public NullOrEmptyException(String errorMessage, Throwable thr) {
super(errorMessage, thr);
}
}

55
core-java-modules/core-java-exceptions/src/test/java/com/baeldung/exceptions/CheckedUncheckedExceptionsUnitTest.java Normal file
View File

@ -0,0 +1,55 @@
package com.baeldung.exceptions;
import static org.junit.jupiter.api.Assertions.assertThrows;
import java.io.FileNotFoundException;
import org.junit.jupiter.api.Assertions;
import org.junit.jupiter.api.Test;
/**
* Tests the {@link CheckedUncheckedExceptions}.
*/
public class CheckedUncheckedExceptionsUnitTest {
@Test
public void whenFileNotExist_thenThrowException() {
assertThrows(FileNotFoundException.class, () -> {
CheckedUncheckedExceptions.checkedExceptionWithThrows();
});
}
@Test
public void whenTryCatchExcetpion_thenSuccess() {
try {
CheckedUncheckedExceptions.checkedExceptionWithTryCatch();
} catch (Exception e) {
Assertions.fail(e.getMessage());
}
}
@Test
public void whenDivideByZero_thenThrowException() {
assertThrows(ArithmeticException.class, () -> {
CheckedUncheckedExceptions.divideByZero();
});
}
@Test
public void whenInvalidFile_thenThrowException() {
assertThrows(IncorrectFileNameException.class, () -> {
CheckedUncheckedExceptions.checkFile("wrongFileName.txt");
});
}
@Test
public void whenNullOrEmptyFile_thenThrowException() {
assertThrows(NullOrEmptyException.class, () -> {
CheckedUncheckedExceptions.checkFile(null);
});
assertThrows(NullOrEmptyException.class, () -> {
CheckedUncheckedExceptions.checkFile("");
});
}
}

3
core-java-modules/core-java-io-2/.gitignore vendored Normal file
View File

@ -0,0 +1,3 @@
# Intellij
.idea/
*.iml

279
core-java-modules/core-java-io-2/pom.xml Normal file
View File

@ -0,0 +1,279 @@
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<artifactId>core-java-io-2</artifactId>
<version>0.1.0-SNAPSHOT</version>
<name>core-java-io-2</name>
<packaging>jar</packaging>
<parent>
<groupId>com.baeldung</groupId>
<artifactId>parent-java</artifactId>
<version>0.0.1-SNAPSHOT</version>
<relativePath>../../parent-java</relativePath>
</parent>
<dependencies>
<!-- utils -->
<dependency>
<groupId>net.sourceforge.collections</groupId>
<artifactId>collections-generic</artifactId>
<version>${collections-generic.version}</version>
</dependency>
<dependency>
<groupId>org.apache.commons</groupId>
<artifactId>commons-collections4</artifactId>
<version>${commons-collections4.version}</version>
</dependency>
<dependency>
<groupId>commons-io</groupId>
<artifactId>commons-io</artifactId>
<version>${commons-io.version}</version>
</dependency>
<dependency>
<groupId>org.apache.commons</groupId>
<artifactId>commons-lang3</artifactId>
<version>${commons-lang3.version}</version>
</dependency>
<dependency>
<groupId>org.apache.commons</groupId>
<artifactId>commons-math3</artifactId>
<version>${commons-math3.version}</version>
</dependency>
<dependency>
<groupId>org.decimal4j</groupId>
<artifactId>decimal4j</artifactId>
<version>${decimal4j.version}</version>
</dependency>
<dependency>
<groupId>org.bouncycastle</groupId>
<artifactId>bcprov-jdk15on</artifactId>
<version>${bouncycastle.version}</version>
</dependency>
<dependency>
<groupId>org.unix4j</groupId>
<artifactId>unix4j-command</artifactId>
<version>${unix4j.version}</version>
</dependency>
<dependency>
<groupId>com.googlecode.grep4j</groupId>
<artifactId>grep4j</artifactId>
<version>${grep4j.version}</version>
</dependency>
<!-- web -->
<!-- marshalling -->
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-databind</artifactId>
<version>${jackson.version}</version>
</dependency>
<!-- logging -->
<dependency>
<groupId>log4j</groupId>
<artifactId>log4j</artifactId>
<version>${log4j.version}</version>
</dependency>
<dependency> <!-- needed to bridge to slf4j for projects that use the log4j APIs directly -->
<groupId>org.slf4j</groupId>
<artifactId>log4j-over-slf4j</artifactId>
<version>${org.slf4j.version}</version>
</dependency>
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<version>${lombok.version}</version>
<scope>provided</scope>
</dependency>
<!-- test scoped -->
<dependency>
<groupId>org.assertj</groupId>
<artifactId>assertj-core</artifactId>
<version>${assertj.version}</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>com.jayway.awaitility</groupId>
<artifactId>awaitility</artifactId>
<version>${avaitility.version}</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>commons-codec</groupId>
<artifactId>commons-codec</artifactId>
<version>${commons-codec.version}</version>
</dependency>
<dependency>
<groupId>org.javamoney</groupId>
<artifactId>moneta</artifactId>
<version>${moneta.version}</version>
</dependency>
<dependency>
<groupId>org.owasp.esapi</groupId>
<artifactId>esapi</artifactId>
<version>${esapi.version}</version>
</dependency>
<dependency>
<groupId>com.sun.messaging.mq</groupId>
<artifactId>fscontext</artifactId>
<version>${fscontext.version}</version>
</dependency>
<dependency>
<groupId>com.codepoetics</groupId>
<artifactId>protonpack</artifactId>
<version>${protonpack.version}</version>
</dependency>
<dependency>
<groupId>one.util</groupId>
<artifactId>streamex</artifactId>
<version>${streamex.version}</version>
</dependency>
<dependency>
<groupId>io.vavr</groupId>
<artifactId>vavr</artifactId>
<version>${vavr.version}</version>
</dependency>
<dependency>
<groupId>org.openjdk.jmh</groupId>
<artifactId>jmh-core</artifactId>
<version>${jmh-core.version}</version>
</dependency>
<dependency>
<groupId>org.openjdk.jmh</groupId>
<artifactId>jmh-generator-annprocess</artifactId>
<version>${jmh-generator-annprocess.version}</version>
</dependency>
<dependency>
<groupId>org.hsqldb</groupId>
<artifactId>hsqldb</artifactId>
<version>${hsqldb.version}</version>
<scope>runtime</scope>
</dependency>
<!-- https://mvnrepository.com/artifact/org.asynchttpclient/async-http-client -->
<dependency>
<groupId>org.asynchttpclient</groupId>
<artifactId>async-http-client</artifactId>
<version>${async-http-client.version}</version>
</dependency>
<dependency>
<groupId>com.opencsv</groupId>
<artifactId>opencsv</artifactId>
<version>${opencsv.version}</version>
<scope>test</scope>
</dependency>
<!-- Mime Type Resolution Libraries -->
<dependency>
<groupId>org.apache.tika</groupId>
<artifactId>tika-core</artifactId>
<version>${tika.version}</version>
</dependency>
<dependency>
<groupId>net.sf.jmimemagic</groupId>
<artifactId>jmimemagic</artifactId>
<version>${jmime-magic.version}</version>
</dependency>
</dependencies>
<build>
<finalName>core-java-io-2</finalName>
<resources>
<resource>
<directory>src/main/resources</directory>
<filtering>true</filtering>
</resource>
</resources>
<plugins>
<plugin>
<groupId>org.codehaus.mojo</groupId>
<artifactId>exec-maven-plugin</artifactId>
<version>${exec-maven-plugin.version}</version>
<configuration>
<executable>java</executable>
<mainClass>com.baeldung.outofmemoryerror.OutOfMemoryGCLimitExceed</mainClass>
<arguments>
<argument>-Xmx300m</argument>
<argument>-XX:+UseParallelGC</argument>
<argument>-classpath</argument>
<classpath />
<argument>com.baeldung.outofmemoryerror.OutOfMemoryGCLimitExceed</argument>
</arguments>
</configuration>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-javadoc-plugin</artifactId>
<version>${maven-javadoc-plugin.version}</version>
<configuration>
<source>${maven.compiler.source}</source>
<target>${maven.compiler.target}</target>
</configuration>
</plugin>
</plugins>
</build>
<profiles>
<profile>
<id>integration</id>
<build>
<plugins>
<plugin>
<groupId>org.codehaus.mojo</groupId>
<artifactId>exec-maven-plugin</artifactId>
<executions>
<execution>
<id>run-benchmarks</id>
<!-- <phase>integration-test</phase> -->
<phase>none</phase>
<goals>
<goal>exec</goal>
</goals>
<configuration>
<classpathScope>test</classpathScope>
<executable>java</executable>
<arguments>
<argument>-classpath</argument>
<classpath />
<argument>org.openjdk.jmh.Main</argument>
<argument>.*</argument>
</arguments>
</configuration>
</execution>
</executions>
</plugin>
</plugins>
</build>
</profile>
</profiles>
<properties>
<!-- util -->
<bouncycastle.version>1.55</bouncycastle.version>
<commons-codec.version>1.10</commons-codec.version>
<commons-math3.version>3.6.1</commons-math3.version>
<decimal4j.version>1.0.3</decimal4j.version>
<commons-collections4.version>4.1</commons-collections4.version>
<collections-generic.version>4.01</collections-generic.version>
<unix4j.version>0.4</unix4j.version>
<grep4j.version>1.8.7</grep4j.version>
<fscontext.version>4.6-b01</fscontext.version>
<protonpack.version>1.13</protonpack.version>
<streamex.version>0.6.5</streamex.version>
<vavr.version>0.9.0</vavr.version>
<opencsv.version>4.1</opencsv.version>
<!-- testing -->
<assertj.version>3.6.1</assertj.version>
<avaitility.version>1.7.0</avaitility.version>
<!-- maven plugins -->
<maven-javadoc-plugin.version>3.0.0-M1</maven-javadoc-plugin.version>
<hsqldb.version>2.4.0</hsqldb.version>
<esapi.version>2.1.0.1</esapi.version>
<jmh-generator-annprocess.version>1.19</jmh-generator-annprocess.version>
<async-http-client.version>2.4.5</async-http-client.version>
<!-- Mime Type Libraries -->
<tika.version>1.18</tika.version>
<jmime-magic.version>0.1.5</jmime-magic.version>
</properties>
</project>

57
core-java-modules/core-java-io-2/src/main/java/com/baeldung/filereader/FileReaderExample.java Normal file
View File

@ -0,0 +1,57 @@
package com.baeldung.filereader;
import java.io.*;
public class FileReaderExample {
public static String readAllCharactersOneByOne(Reader reader) throws IOException {
StringBuilder content = new StringBuilder();
int nextChar;
while ((nextChar = reader.read()) != -1) {
content.append((char) nextChar);
}
return String.valueOf(content);
}
public static String readMultipleCharacters(Reader reader, int length) throws IOException {
char[] buffer = new char[length];
int charactersRead = reader.read(buffer, 0, length);
if (charactersRead != -1) {
return new String(buffer, 0, charactersRead);
} else {
return "";
}
}
public static String readFile(String path) {
FileReader fileReader = null;
try {
fileReader = new FileReader(path);
return readAllCharactersOneByOne(fileReader);
} catch (IOException e) {
e.printStackTrace();
} finally {
if (fileReader != null) {
try {
fileReader.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
return null;
}
public static String readFileUsingTryWithResources(String path) {
try (FileReader fileReader = new FileReader(path)) {
return readAllCharactersOneByOne(fileReader);
} catch (IOException e) {
e.printStackTrace();
}
return null;
}
}

62
core-java-modules/core-java-io-2/src/test/java/com/baeldung/filereader/FileReaderExampleUnitTest.java Normal file
View File

@ -0,0 +1,62 @@
package com.baeldung.filereader;
import org.junit.Assert;
import org.junit.Test;
import java.io.File;
import java.io.FileReader;
import java.io.IOException;
public class FileReaderExampleUnitTest {
private static final String FILE_PATH = "src/test/resources/HelloWorld.txt";
@Test
public void givenFileReader_whenReadAllCharacters_thenReturnsContent() throws IOException {
String expectedText = "Hello, World!";
File file = new File(FILE_PATH);
FileReader fileReader = null;
try {
fileReader = new FileReader(file);
String content = FileReaderExample.readAllCharactersOneByOne(fileReader);
Assert.assertEquals(expectedText, content);
} finally {
if (fileReader != null) {
fileReader.close();
}
}
}
@Test
public void givenFileReader_whenReadMultipleCharacters_thenReturnsContent() throws IOException {
String expectedText = "Hello";
File file = new File(FILE_PATH);
FileReader fileReader = null;
try {
fileReader = new FileReader(file);
String content = FileReaderExample.readMultipleCharacters(fileReader, 5);
Assert.assertEquals(expectedText, content);
} finally {
if (fileReader != null) {
fileReader.close();
}
}
}
@Test
public void whenReadFile_thenReturnsContent() {
String expectedText = "Hello, World!";
String content = FileReaderExample.readFile(FILE_PATH);
Assert.assertEquals(expectedText, content);
}
@Test
public void whenReadFileUsingTryWithResources_thenReturnsContent() {
String expectedText = "Hello, World!";
String content = FileReaderExample.readFileUsingTryWithResources(FILE_PATH);
Assert.assertEquals(expectedText, content);
}
}

1
core-java-modules/core-java-io-2/src/test/resources/HelloWorld.txt Normal file
View File

@ -0,0 +1 @@
Hello, World!

2
core-java-modules/core-java-io/src/test/java/org/baeldung/java/io/JavaWriteToFileUnitTest.java → core-java-modules/core-java-io/src/test/java/org/baeldung/writetofile/JavaWriteToFileUnitTest.java
View File

@ -1,4 +1,4 @@
package org.baeldung.java.io; package org.baeldung.writetofile;
import static org.junit.Assert.assertEquals; import static org.junit.Assert.assertEquals;

66
core-java-modules/core-java-jndi/pom.xml Normal file
View File

@ -0,0 +1,66 @@
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.baeldung.jndi</groupId>
<artifactId>core-java-jndi</artifactId>
<version>1.0-SNAPSHOT</version>
<name>core-java-jndi</name>
<parent>
<groupId>com.baeldung</groupId>
<artifactId>parent-modules</artifactId>
<version>1.0.0-SNAPSHOT</version>
<relativePath>../../</relativePath>
</parent>
<dependencies>
<dependency>
<groupId>org.junit.jupiter</groupId>
<artifactId>junit-jupiter</artifactId>
<version>5.5.1</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-core</artifactId>
<version>5.0.9.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-context</artifactId>
<version>5.0.9.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-jdbc</artifactId>
<version>5.0.9.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-test</artifactId>
<version>5.0.9.RELEASE</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>com.h2database</groupId>
<artifactId>h2</artifactId>
<version>1.4.199</version>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<configuration>
<source>1.8</source>
<target>1.8</target>
</configuration>
</plugin>
</plugins>
</build>
</project>

60
core-java-modules/core-java-jndi/src/test/java/com/baeldung/jndi/JndiUnitTest.java Normal file
View File

@ -0,0 +1,60 @@
package com.baeldung.jndi;
import org.junit.jupiter.api.BeforeAll;
import org.junit.jupiter.api.Test;
import org.springframework.jdbc.datasource.DriverManagerDataSource;
import org.springframework.jndi.JndiTemplate;
import org.springframework.mock.jndi.SimpleNamingContextBuilder;
import javax.naming.*;
import javax.sql.DataSource;
import java.util.Enumeration;
import static org.junit.jupiter.api.Assertions.*;
class JndiUnitTest {
private static InitialContext ctx;
private static DriverManagerDataSource ds;
@BeforeAll
static void setUp() throws Exception {
SimpleNamingContextBuilder builder = new SimpleNamingContextBuilder();
ds = new DriverManagerDataSource("jdbc:h2:mem:mydb");
builder.activate();
JndiTemplate jndiTemplate = new JndiTemplate();
ctx = (InitialContext) jndiTemplate.getContext();
}
@Test
void givenACompositeName_whenAddingAnElement_thenNameIncludesIt() throws Exception {
Name objectName = new CompositeName("java:comp/env/jdbc");
Enumeration<String> elements = objectName.getAll();
while(elements.hasMoreElements()) {
System.out.println(elements.nextElement());
}
objectName.add("example");
assertEquals("env", objectName.get(1));
assertEquals("example", objectName.get(objectName.size() - 1));
}
@Test
void givenADataSource_whenAddingDriver_thenBind() throws Exception {
ds.setDriverClassName("org.h2.Driver");
ctx.bind("java:comp/env/jdbc/datasource", ds);
}
@Test
void givenContext_whenLookupByName_thenValidDataSource() throws Exception {
DataSource ds = (DataSource) ctx.lookup("java:comp/env/jdbc/datasource");
assertNotNull(ds);
assertNotNull(ds.getConnection());
}
}

42
core-java-modules/core-java-jndi/src/test/java/com/baeldung/jndi/exceptions/JndiExceptionsUnitTest.java Normal file
View File

@ -0,0 +1,42 @@
package com.baeldung.jndi.exceptions;
import org.junit.jupiter.api.MethodOrderer;
import org.junit.jupiter.api.Order;
import org.junit.jupiter.api.Test;
import org.junit.jupiter.api.TestMethodOrder;
import org.springframework.jndi.JndiTemplate;
import org.springframework.mock.jndi.SimpleNamingContextBuilder;
import javax.naming.InitialContext;
import javax.naming.NameNotFoundException;
import javax.naming.NoInitialContextException;
import static org.junit.jupiter.api.Assertions.assertThrows;
@TestMethodOrder(MethodOrderer.OrderAnnotation.class)
public class JndiExceptionsUnitTest {
@Test
@Order(1)
void givenNoContext_whenLookupObject_thenThrowNoInitialContext() {
assertThrows(NoInitialContextException.class, () -> {
JndiTemplate jndiTemplate = new JndiTemplate();
InitialContext ctx = (InitialContext) jndiTemplate.getContext();
ctx.lookup("java:comp/env/jdbc/datasource");
}).printStackTrace();
}
@Test
@Order(2)
void givenEmptyContext_whenLookupNotBounds_thenThrowNameNotFound() {
assertThrows(NameNotFoundException.class, () -> {
SimpleNamingContextBuilder builder = new SimpleNamingContextBuilder();
builder.activate();
JndiTemplate jndiTemplate = new JndiTemplate();
InitialContext ctx = (InitialContext) jndiTemplate.getContext();
ctx.lookup("badJndiName");
}).printStackTrace();
}
}

3
core-java-modules/core-java-jpms/README.md Normal file
View File

@ -0,0 +1,3 @@
### Relevant Articles
- [Design Strategies for Decoupling Java Modules](https://www.baeldung.com/java-modules-decoupling-design-strategies)

5
core-java-modules/core-java-lambdas/README.md
View File

@ -1,3 +1,8 @@
## Relevant articles: ## Relevant articles:
- [Why Do Local Variables Used in Lambdas Have to Be Final or Effectively Final?](https://www.baeldung.com/java-lambda-effectively-final-local-variables) - [Why Do Local Variables Used in Lambdas Have to Be Final or Effectively Final?](https://www.baeldung.com/java-lambda-effectively-final-local-variables)
- [Java 8 – Powerful Comparison with Lambdas](http://www.baeldung.com/java-8-sort-lambda)
- [Functional Interfaces in Java 8](http://www.baeldung.com/java-8-functional-interfaces)
- [Lambda Expressions and Functional Interfaces: Tips and Best Practices](http://www.baeldung.com/java-8-lambda-expressions-tips)
- [Exceptions in Java 8 Lambda Expressions](http://www.baeldung.com/java-lambda-exceptions)
- [Method References in Java](https://www.baeldung.com/java-method-references)

10
core-java-modules/core-java-lambdas/pom.xml
View File

@ -5,7 +5,7 @@
<modelVersion>4.0.0</modelVersion> <modelVersion>4.0.0</modelVersion>
<artifactId>core-java-lambdas</artifactId> <artifactId>core-java-lambdas</artifactId>
<version>0.1.0-SNAPSHOT</version> <version>0.1.0-SNAPSHOT</version>
<name>core-java</name> <name>core-java-lambdas</name>
<packaging>jar</packaging> <packaging>jar</packaging>
<parent> <parent>
@ -15,5 +15,11 @@
<relativePath>../../parent-java</relativePath> <relativePath>../../parent-java</relativePath>
</parent> </parent>
<dependencies>
<dependency>
<groupId>org.apache.commons</groupId>
<artifactId>commons-lang3</artifactId>
<version>${commons-lang3.version}</version>
</dependency>
</dependencies>
</project> </project>

0
core-java-modules/core-java-8/src/test/java/com/baeldung/java8/entity/Human.java → core-java-modules/core-java-lambdas/src/main/java/com/baeldung/java8/entity/Human.java
View File

0
core-java-modules/core-java-8/src/main/java/com/baeldung/java8/lambda/exceptions/LambdaExceptionWrappers.java → core-java-modules/core-java-lambdas/src/main/java/com/baeldung/java8/lambda/exceptions/LambdaExceptionWrappers.java
View File

0
core-java-modules/core-java-8/src/main/java/com/baeldung/java8/lambda/exceptions/ThrowingConsumer.java → core-java-modules/core-java-lambdas/src/main/java/com/baeldung/java8/lambda/exceptions/ThrowingConsumer.java
View File

0
core-java-modules/core-java-8/src/main/java/com/baeldung/java8/lambda/tips/Bar.java → core-java-modules/core-java-lambdas/src/main/java/com/baeldung/java8/lambda/tips/Bar.java
View File

0
core-java-modules/core-java-8/src/main/java/com/baeldung/java8/lambda/tips/Baz.java → core-java-modules/core-java-lambdas/src/main/java/com/baeldung/java8/lambda/tips/Baz.java
View File

0
core-java-modules/core-java-8/src/main/java/com/baeldung/java8/lambda/tips/Foo.java → core-java-modules/core-java-lambdas/src/main/java/com/baeldung/java8/lambda/tips/Foo.java
View File

0
core-java-modules/core-java-8/src/main/java/com/baeldung/java8/lambda/tips/FooExtended.java → core-java-modules/core-java-lambdas/src/main/java/com/baeldung/java8/lambda/tips/FooExtended.java
View File

0
core-java-modules/core-java-8/src/main/java/com/baeldung/java8/lambda/tips/Processor.java → core-java-modules/core-java-lambdas/src/main/java/com/baeldung/java8/lambda/tips/Processor.java
View File

0
core-java-modules/core-java-8/src/main/java/com/baeldung/java8/lambda/tips/ProcessorImpl.java → core-java-modules/core-java-lambdas/src/main/java/com/baeldung/java8/lambda/tips/ProcessorImpl.java
View File

0
core-java-modules/core-java-8/src/main/java/com/baeldung/java8/lambda/tips/UseFoo.java → core-java-modules/core-java-lambdas/src/main/java/com/baeldung/java8/lambda/tips/UseFoo.java
View File

0
core-java-modules/core-java-8/src/test/java/com/baeldung/functionalinterface/FunctionalInterfaceUnitTest.java → core-java-modules/core-java-lambdas/src/test/java/com/baeldung/functionalinterface/FunctionalInterfaceUnitTest.java
View File

0
core-java-modules/core-java-8/src/test/java/com/baeldung/functionalinterface/ShortToByteFunction.java → core-java-modules/core-java-lambdas/src/test/java/com/baeldung/functionalinterface/ShortToByteFunction.java
View File

0
core-java-modules/core-java-8/src/test/java/com/baeldung/java8/Java8SortUnitTest.java → core-java-modules/core-java-lambdas/src/test/java/com/baeldung/java8/Java8SortUnitTest.java
View File

0
core-java-modules/core-java-8/src/test/java/com/baeldung/java8/lambda/exceptions/LambdaExceptionWrappersUnitTest.java → core-java-modules/core-java-lambdas/src/test/java/com/baeldung/java8/lambda/exceptions/LambdaExceptionWrappersUnitTest.java
View File

0
core-java-modules/core-java-8/src/test/java/com/baeldung/java8/lambda/methodreference/Bicycle.java → core-java-modules/core-java-lambdas/src/test/java/com/baeldung/java8/lambda/methodreference/Bicycle.java
View File

Some files were not shown because too many files have changed in this diff Show More