Merge branch 'master' into bael-1908

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smokeyrobot 2018-07-11 15:58:58 -04:00 committed by GitHub
commit c23c12831c
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461 changed files with 12364 additions and 1405 deletions

3
.gitmodules vendored
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@ -1,3 +0,0 @@
[submodule "testgitrepo"]
path = testgitrepo
url = /home/prd/Development/projects/idea/tutorials/spring-boot/src/main/resources/testgitrepo/

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@ -22,3 +22,6 @@
- [Displaying Money Amounts in Words](http://www.baeldung.com/java-money-into-words)
- [A Collaborative Filtering Recommendation System in Java](http://www.baeldung.com/java-collaborative-filtering-recommendations)
- [Find All Pairs of Numbers in an Array That Add Up to a Given Sum](http://www.baeldung.com/java-algorithm-number-pairs-sum)
- [Converting Between Roman and Arabic Numerals in Java](http://www.baeldung.com/java-convert-roman-arabic)
- [Practical Java Examples of the Big O Notation](http://www.baeldung.com/java-algorithm-complexity)
- [Find the Middle Element of a Linked List](http://www.baeldung.com/java-linked-list-middle-element)

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@ -10,7 +10,7 @@ public class MonteCarloTreeSearch {
private static final int WIN_SCORE = 10;
private int level;
private int oponent;
private int opponent;
public MonteCarloTreeSearch() {
this.level = 3;
@ -32,11 +32,11 @@ public class MonteCarloTreeSearch {
long start = System.currentTimeMillis();
long end = start + 60 * getMillisForCurrentLevel();
oponent = 3 - playerNo;
opponent = 3 - playerNo;
Tree tree = new Tree();
Node rootNode = tree.getRoot();
rootNode.getState().setBoard(board);
rootNode.getState().setPlayerNo(oponent);
rootNode.getState().setPlayerNo(opponent);
while (System.currentTimeMillis() < end) {
// Phase 1 - Selection
@ -93,7 +93,7 @@ public class MonteCarloTreeSearch {
State tempState = tempNode.getState();
int boardStatus = tempState.getBoard().checkStatus();
if (boardStatus == oponent) {
if (boardStatus == opponent) {
tempNode.getParent().getState().setWinScore(Integer.MIN_VALUE);
return boardStatus;
}

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@ -0,0 +1,52 @@
package com.baeldung.algorithms.romannumerals;
import java.util.List;
class RomanArabicConverter {
public static int romanToArabic(String input) {
String romanNumeral = input.toUpperCase();
int result = 0;
List<RomanNumeral> romanNumerals = RomanNumeral.getReverseSortedValues();
int i = 0;
while ((romanNumeral.length() > 0) && (i < romanNumerals.size())) {
RomanNumeral symbol = romanNumerals.get(i);
if (romanNumeral.startsWith(symbol.name())) {
result += symbol.getValue();
romanNumeral = romanNumeral.substring(symbol.name().length());
} else {
i++;
}
}
if (romanNumeral.length() > 0) {
throw new IllegalArgumentException(input + " cannot be converted to a Roman Numeral");
}
return result;
}
public static String arabicToRoman(int number) {
if ((number <= 0) || (number > 4000)) {
throw new IllegalArgumentException(number + " is not in range (0,4000]");
}
List<RomanNumeral> romanNumerals = RomanNumeral.getReverseSortedValues();
int i = 0;
StringBuilder sb = new StringBuilder();
while (number > 0 && i < romanNumerals.size()) {
RomanNumeral currentSymbol = romanNumerals.get(i);
if (currentSymbol.getValue() <= number) {
sb.append(currentSymbol.name());
number -= currentSymbol.getValue();
} else {
i++;
}
}
return sb.toString();
}
}

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@ -0,0 +1,26 @@
package com.baeldung.algorithms.romannumerals;
import java.util.Arrays;
import java.util.Comparator;
import java.util.List;
import java.util.stream.Collectors;
enum RomanNumeral {
I(1), IV(4), V(5), IX(9), X(10), XL(40), L(50), XC(90), C(100), CD(400), D(500), CM(900), M(1000);
private int value;
RomanNumeral(int value) {
this.value = value;
}
public int getValue() {
return value;
}
public static List<RomanNumeral> getReverseSortedValues() {
return Arrays.stream(values())
.sorted(Comparator.comparing((RomanNumeral e) -> e.value).reversed())
.collect(Collectors.toList());
}
}

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@ -0,0 +1,29 @@
package com.baeldung.algorithms.romannumerals;
import static org.assertj.core.api.Assertions.assertThat;
import org.junit.Test;
public class RomanArabicConverterUnitTest {
@Test
public void given2018Roman_WhenConvertingToArabic_ThenReturn2018() {
String roman2018 = "MMXVIII";
int result = RomanArabicConverter.romanToArabic(roman2018);
assertThat(result).isEqualTo(2018);
}
@Test
public void given1999Arabic_WhenConvertingToRoman_ThenReturnMCMXCIX() {
int arabic1999 = 1999;
String result = RomanArabicConverter.arabicToRoman(arabic1999);
assertThat(result).isEqualTo("MCMXCIX");
}
}

3
antlr/README.md Normal file
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@ -0,0 +1,3 @@
### Relevant Articles:
- [Java with ANTLR](http://www.baeldung.com/java-antlr)

57
apache-meecrowave/pom.xml Normal file
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@ -0,0 +1,57 @@
<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</groupId>
<artifactId>apache-meecrowave</artifactId>
<version>0.0.1</version>
<name>apache-meecrowave</name>
<description>A sample REST API application with Meecrowave</description>
<properties>
<maven.compiler.source>1.8</maven.compiler.source>
<maven.compiler.target>1.8</maven.compiler.target>
</properties>
<dependencies>
<!-- https://mvnrepository.com/artifact/org.apache.meecrowave/meecrowave-core -->
<dependency>
<groupId>org.apache.meecrowave</groupId>
<artifactId>meecrowave-core</artifactId>
<version>1.2.1</version>
</dependency>
<!-- https://mvnrepository.com/artifact/org.apache.meecrowave/meecrowave-jpa -->
<dependency>
<groupId>org.apache.meecrowave</groupId>
<artifactId>meecrowave-jpa</artifactId>
<version>1.2.1</version>
</dependency>
<dependency>
<groupId>com.squareup.okhttp3</groupId>
<artifactId>okhttp</artifactId>
<version>3.10.0</version>
</dependency>
<dependency>
<groupId>org.apache.meecrowave</groupId>
<artifactId>meecrowave-junit</artifactId>
<version>1.2.0</version>
<scope>test</scope>
</dependency>
<!-- https://mvnrepository.com/artifact/junit/junit -->
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.10</version>
<scope>test</scope>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.apache.meecrowave</groupId>
<artifactId>meecrowave-maven-plugin</artifactId>
<version>1.2.1</version>
</plugin>
</plugins>
</build>
</project>

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@ -0,0 +1,30 @@
package com.baeldung.meecrowave;
public class Article {
private String name;
private String author;
public Article() {
}
public Article(String name, String author) {
this.author = author;
this.name = name;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getAuthor() {
return author;
}
public void setAuthor(String author) {
this.author = author;
}
}

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@ -0,0 +1,32 @@
package com.baeldung.meecrowave;
import javax.enterprise.context.RequestScoped;
import javax.inject.Inject;
import javax.ws.rs.GET;
import javax.ws.rs.POST;
import javax.ws.rs.Path;
import javax.ws.rs.core.Response;
import javax.ws.rs.core.Response.Status;
@RequestScoped
@Path("article")
public class ArticleEndpoints {
@Inject
ArticleService articleService;
@GET
public Response getArticle() {
return Response.ok()
.entity(new Article("name", "author"))
.build();
}
@POST
public Response createArticle(Article article) {
return Response.status(Status.CREATED)
.entity(articleService.createArticle(article))
.build();
}
}

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@ -0,0 +1,10 @@
package com.baeldung.meecrowave;
import javax.enterprise.context.ApplicationScoped;
@ApplicationScoped
public class ArticleService {
public Article createArticle(Article article) {
return article;
}
}

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@ -0,0 +1,16 @@
package com.baeldung.meecrowave;
import org.apache.meecrowave.Meecrowave;
public class Server {
public static void main(String[] args) {
final Meecrowave.Builder builder = new Meecrowave.Builder();
builder.setScanningPackageIncludes("com.baeldung.meecrowave");
builder.setJaxrsMapping("/api/*");
builder.setJsonpPrettify(true);
try (Meecrowave meecrowave = new Meecrowave(builder)) {
meecrowave.bake().await();
}
}
}

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@ -0,0 +1,41 @@
package com.baeldung.meecrowave;
import static org.junit.Assert.assertEquals;
import java.io.IOException;
import org.apache.meecrowave.Meecrowave;
import org.apache.meecrowave.junit.MonoMeecrowave;
import org.apache.meecrowave.testing.ConfigurationInject;
import org.junit.BeforeClass;
import org.junit.Test;
import org.junit.runner.RunWith;
import okhttp3.OkHttpClient;
import okhttp3.Request;
import okhttp3.Response;
@RunWith(MonoMeecrowave.Runner.class)
public class ArticleEndpointsTest {
@ConfigurationInject
private Meecrowave.Builder config;
private static OkHttpClient client;
@BeforeClass
public static void setup() {
client = new OkHttpClient();
}
@Test
public void whenRetunedArticle_thenCorrect() throws IOException {
final String base = "http://localhost:"+config.getHttpPort();
Request request = new Request.Builder()
.url(base+"/article")
.build();
Response response = client.newCall(request).execute();
assertEquals(200, response.code());
}
}

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@ -12,7 +12,7 @@ import org.apache.solr.common.SolrDocumentList;
import org.junit.Before;
import org.junit.Test;
public class SolrJavaIntegrationTest {
public class SolrJavaLiveTest {
private SolrJavaIntegration solrJavaIntegration;

3
aws-lambda/README.md Normal file
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@ -0,0 +1,3 @@
### Relevant Articles:
- [Using AWS Lambda with API Gateway](http://www.baeldung.com/aws-lambda-api-gateway)
- [Introduction to AWS Serverless Application Model](http://www.baeldung.com/aws-serverless)

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@ -0,0 +1,60 @@
AWSTemplateFormatVersion: '2010-09-09'
Transform: 'AWS::Serverless-2016-10-31'
Description: Baeldung Serverless Application Model Example with Implicit API Definition
Globals:
Api:
EndpointConfiguration: REGIONAL
Name: "TestAPI"
Resources:
PersonTable:
Type: AWS::Serverless::SimpleTable
Properties:
PrimaryKey:
Name: id
Type: Number
TableName: Person
StorePersonFunction:
Type: AWS::Serverless::Function
Properties:
Handler: com.baeldung.lambda.apigateway.APIDemoHandler::handleRequest
Runtime: java8
Timeout: 15
MemorySize: 512
CodeUri: ../target/aws-lambda-0.1.0-SNAPSHOT.jar
Policies:
- DynamoDBCrudPolicy:
TableName: !Ref PersonTable
Environment:
Variables:
TABLE_NAME: !Ref PersonTable
Events:
StoreApi:
Type: Api
Properties:
Path: /persons
Method: PUT
GetPersonByHTTPParamFunction:
Type: AWS::Serverless::Function
Properties:
Handler: com.baeldung.lambda.apigateway.APIDemoHandler::handleGetByParam
Runtime: java8
Timeout: 15
MemorySize: 512
CodeUri: ../target/aws-lambda-0.1.0-SNAPSHOT.jar
Policies:
- DynamoDBReadPolicy:
TableName: !Ref PersonTable
Environment:
Variables:
TABLE_NAME: !Ref PersonTable
Events:
GetByPathApi:
Type: Api
Properties:
Path: /persons/{id}
Method: GET
GetByQueryApi:
Type: Api
Properties:
Path: /persons
Method: GET

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@ -0,0 +1,112 @@
AWSTemplateFormatVersion: '2010-09-09'
Transform: 'AWS::Serverless-2016-10-31'
Description: Baeldung Serverless Application Model Example with Inline Swagger API Definition
Resources:
PersonTable:
Type: AWS::Serverless::SimpleTable
Properties:
PrimaryKey:
Name: id
Type: Number
TableName: Person
StorePersonFunction:
Type: AWS::Serverless::Function
Properties:
Handler: com.baeldung.lambda.apigateway.APIDemoHandler::handleRequest
Runtime: java8
Timeout: 15
MemorySize: 512
CodeUri: ../target/aws-lambda-0.1.0-SNAPSHOT.jar
Policies:
- DynamoDBCrudPolicy:
TableName: !Ref PersonTable
Environment:
Variables:
TABLE_NAME: !Ref PersonTable
Events:
StoreApi:
Type: Api
Properties:
Path: /persons
Method: PUT
RestApiId:
Ref: MyApi
GetPersonByHTTPParamFunction:
Type: AWS::Serverless::Function
Properties:
Handler: com.baeldung.lambda.apigateway.APIDemoHandler::handleGetByParam
Runtime: java8
Timeout: 15
MemorySize: 512
CodeUri: ../target/aws-lambda-0.1.0-SNAPSHOT.jar
Policies:
- DynamoDBReadPolicy:
TableName: !Ref PersonTable
Environment:
Variables:
TABLE_NAME: !Ref PersonTable
Events:
GetByPathApi:
Type: Api
Properties:
Path: /persons/{id}
Method: GET
RestApiId:
Ref: MyApi
GetByQueryApi:
Type: Api
Properties:
Path: /persons
Method: GET
RestApiId:
Ref: MyApi
MyApi:
Type: AWS::Serverless::Api
Properties:
StageName: test
EndpointConfiguration: REGIONAL
DefinitionBody:
swagger: "2.0"
info:
title: "TestAPI"
paths:
/persons:
get:
parameters:
- name: "id"
in: "query"
required: true
type: "string"
x-amazon-apigateway-request-validator: "Validate query string parameters and\
\ headers"
x-amazon-apigateway-integration:
uri:
Fn::Sub: arn:aws:apigateway:${AWS::Region}:lambda:path/2015-03-31/functions/${GetPersonByHTTPParamFunction.Arn}/invocations
responses: {}
httpMethod: "POST"
type: "aws_proxy"
put:
x-amazon-apigateway-integration:
uri:
Fn::Sub: arn:aws:apigateway:${AWS::Region}:lambda:path/2015-03-31/functions/${StorePersonFunction.Arn}/invocations
responses: {}
httpMethod: "POST"
type: "aws_proxy"
/persons/{id}:
get:
parameters:
- name: "id"
in: "path"
required: true
type: "string"
responses: {}
x-amazon-apigateway-integration:
uri:
Fn::Sub: arn:aws:apigateway:${AWS::Region}:lambda:path/2015-03-31/functions/${GetPersonByHTTPParamFunction.Arn}/invocations
responses: {}
httpMethod: "POST"
type: "aws_proxy"
x-amazon-apigateway-request-validators:
Validate query string parameters and headers:
validateRequestParameters: true
validateRequestBody: false

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@ -15,152 +15,107 @@ import java.io.*;
public class APIDemoHandler implements RequestStreamHandler {
private JSONParser parser = new JSONParser();
private static final String DYNAMODB_TABLE_NAME = System.getenv("TABLE_NAME");
private JSONParser parser = new JSONParser();
private static final String DYNAMODB_TABLE_NAME = System.getenv("TABLE_NAME");
@Override
public void handleRequest(InputStream inputStream, OutputStream outputStream, Context context) throws IOException {
@Override
public void handleRequest(InputStream inputStream, OutputStream outputStream, Context context) throws IOException {
BufferedReader reader = new BufferedReader(new InputStreamReader(inputStream));
JSONObject responseJson = new JSONObject();
BufferedReader reader = new BufferedReader(new InputStreamReader(inputStream));
JSONObject responseJson = new JSONObject();
AmazonDynamoDB client = AmazonDynamoDBClientBuilder.defaultClient();
DynamoDB dynamoDb = new DynamoDB(client);
AmazonDynamoDB client = AmazonDynamoDBClientBuilder.defaultClient();
DynamoDB dynamoDb = new DynamoDB(client);
try {
JSONObject event = (JSONObject) parser.parse(reader);
try {
JSONObject event = (JSONObject) parser.parse(reader);
if (event.get("body") != null) {
if (event.get("body") != null) {
Person person = new Person((String) event.get("body"));
Person person = new Person((String) event.get("body"));
dynamoDb.getTable(DYNAMODB_TABLE_NAME)
.putItem(new PutItemSpec().withItem(new Item().withNumber("id", person.getId())
.withString("firstName", person.getFirstName())
.withString("lastName", person.getLastName()).withNumber("age", person.getAge())
.withString("address", person.getAddress())));
}
dynamoDb.getTable(DYNAMODB_TABLE_NAME)
.putItem(new PutItemSpec().withItem(new Item().withNumber("id", person.getId())
.withString("name", person.getName())));
}
JSONObject responseBody = new JSONObject();
responseBody.put("message", "New item created");
JSONObject responseBody = new JSONObject();
responseBody.put("message", "New item created");
JSONObject headerJson = new JSONObject();
headerJson.put("x-custom-header", "my custom header value");
JSONObject headerJson = new JSONObject();
headerJson.put("x-custom-header", "my custom header value");
responseJson.put("statusCode", 200);
responseJson.put("headers", headerJson);
responseJson.put("body", responseBody.toString());
responseJson.put("statusCode", 200);
responseJson.put("headers", headerJson);
responseJson.put("body", responseBody.toString());
} catch (ParseException pex) {
responseJson.put("statusCode", 400);
responseJson.put("exception", pex);
}
} catch (ParseException pex) {
responseJson.put("statusCode", 400);
responseJson.put("exception", pex);
}
OutputStreamWriter writer = new OutputStreamWriter(outputStream, "UTF-8");
writer.write(responseJson.toString());
writer.close();
}
OutputStreamWriter writer = new OutputStreamWriter(outputStream, "UTF-8");
writer.write(responseJson.toString());
writer.close();
}
public void handleGetByPathParam(InputStream inputStream, OutputStream outputStream, Context context)
throws IOException {
public void handleGetByParam(InputStream inputStream, OutputStream outputStream, Context context) throws IOException {
BufferedReader reader = new BufferedReader(new InputStreamReader(inputStream));
JSONObject responseJson = new JSONObject();
BufferedReader reader = new BufferedReader(new InputStreamReader(inputStream));
JSONObject responseJson = new JSONObject();
AmazonDynamoDB client = AmazonDynamoDBClientBuilder.defaultClient();
DynamoDB dynamoDb = new DynamoDB(client);
AmazonDynamoDB client = AmazonDynamoDBClientBuilder.defaultClient();
DynamoDB dynamoDb = new DynamoDB(client);
Item result = null;
try {
JSONObject event = (JSONObject) parser.parse(reader);
JSONObject responseBody = new JSONObject();
Item result = null;
try {
JSONObject event = (JSONObject) parser.parse(reader);
JSONObject responseBody = new JSONObject();
if (event.get("pathParameters") != null) {
if (event.get("pathParameters") != null) {
JSONObject pps = (JSONObject) event.get("pathParameters");
if (pps.get("id") != null) {
JSONObject pps = (JSONObject) event.get("pathParameters");
if (pps.get("id") != null) {
int id = Integer.parseInt((String) pps.get("id"));
result = dynamoDb.getTable(DYNAMODB_TABLE_NAME).getItem("id", id);
}
int id = Integer.parseInt((String) pps.get("id"));
result = dynamoDb.getTable(DYNAMODB_TABLE_NAME)
.getItem("id", id);
}
}
if (result != null) {
} else if (event.get("queryStringParameters") != null) {
Person person = new Person(result.toJSON());
responseBody.put("Person", person);
responseJson.put("statusCode", 200);
} else {
JSONObject qps = (JSONObject) event.get("queryStringParameters");
if (qps.get("id") != null) {
responseBody.put("message", "No item found");
responseJson.put("statusCode", 404);
}
int id = Integer.parseInt((String) qps.get("id"));
result = dynamoDb.getTable(DYNAMODB_TABLE_NAME)
.getItem("id", id);
}
}
if (result != null) {
JSONObject headerJson = new JSONObject();
headerJson.put("x-custom-header", "my custom header value");
Person person = new Person(result.toJSON());
responseBody.put("Person", person);
responseJson.put("statusCode", 200);
} else {
responseJson.put("headers", headerJson);
responseJson.put("body", responseBody.toString());
responseBody.put("message", "No item found");
responseJson.put("statusCode", 404);
}
} catch (ParseException pex) {
responseJson.put("statusCode", 400);
responseJson.put("exception", pex);
}
JSONObject headerJson = new JSONObject();
headerJson.put("x-custom-header", "my custom header value");
OutputStreamWriter writer = new OutputStreamWriter(outputStream, "UTF-8");
writer.write(responseJson.toString());
writer.close();
}
responseJson.put("headers", headerJson);
responseJson.put("body", responseBody.toString());
public void handleGetByQueryParam(InputStream inputStream, OutputStream outputStream, Context context)
throws IOException {
BufferedReader reader = new BufferedReader(new InputStreamReader(inputStream));
JSONObject responseJson = new JSONObject();
AmazonDynamoDB client = AmazonDynamoDBClientBuilder.defaultClient();
DynamoDB dynamoDb = new DynamoDB(client);
Item result = null;
try {
JSONObject event = (JSONObject) parser.parse(reader);
JSONObject responseBody = new JSONObject();
if (event.get("queryStringParameters") != null) {
JSONObject qps = (JSONObject) event.get("queryStringParameters");
if (qps.get("id") != null) {
int id = Integer.parseInt((String) qps.get("id"));
result = dynamoDb.getTable(DYNAMODB_TABLE_NAME).getItem("id", id);
}
}
if (result != null) {
Person person = new Person(result.toJSON());
responseBody.put("Person", person);
responseJson.put("statusCode", 200);
} else {
responseBody.put("message", "No item found");
responseJson.put("statusCode", 404);
}
JSONObject headerJson = new JSONObject();
headerJson.put("x-custom-header", "my custom header value");
responseJson.put("headers", headerJson);
responseJson.put("body", responseBody.toString());
} catch (ParseException pex) {
responseJson.put("statusCode", 400);
responseJson.put("exception", pex);
}
OutputStreamWriter writer = new OutputStreamWriter(outputStream, "UTF-8");
writer.write(responseJson.toString());
writer.close();
}
} catch (ParseException pex) {
responseJson.put("statusCode", 400);
responseJson.put("exception", pex);
}
OutputStreamWriter writer = new OutputStreamWriter(outputStream, "UTF-8");
writer.write(responseJson.toString());
writer.close();
}
}

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@ -5,64 +5,34 @@ import com.google.gson.GsonBuilder;
public class Person {
private int id;
private String firstName;
private String lastName;
private int age;
private String address;
private int id;
private String name;
public Person(String json) {
Gson gson = new Gson();
Person request = gson.fromJson(json, Person.class);
this.id = request.getId();
this.firstName = request.getFirstName();
this.lastName = request.getLastName();
this.age = request.getAge();
this.address = request.getAddress();
}
public Person(String json) {
Gson gson = new Gson();
Person request = gson.fromJson(json, Person.class);
this.id = request.getId();
this.name = request.getName();
}
public String toString() {
final Gson gson = new GsonBuilder().setPrettyPrinting().create();
return gson.toJson(this);
}
public String toString() {
final Gson gson = new GsonBuilder().setPrettyPrinting().create();
return gson.toJson(this);
}
public int getId() {
return id;
}
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public void setId(int id) {
this.id = id;
}
public String getFirstName() {
return firstName;
}
public String getName() {
return name;
}
public void setFirstName(String firstName) {
this.firstName = firstName;
}
public String getLastName() {
return lastName;
}
public void setLastName(String lastName) {
this.lastName = lastName;
}
public int getAge() {
return age;
}
public void setAge(int age) {
this.age = age;
}
public String getAddress() {
return address;
}
public void setAddress(String address) {
this.address = address;
}
public void setName(String name) {
this.name = name;
}
}

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@ -3,7 +3,7 @@
xsi:schemaLocation="http://pmd.sf.net/ruleset/1.0.0 http://pmd.sf.net/ruleset_xml_schema.xsd"
xsi:noNamespaceSchemaLocation="http://pmd.sf.net/ruleset_xml_schema.xsd">
<description>Baeldung custom PMD rules</description>
<rule name="UnitTestMustFollowNamingConventionRule" message="Test class name doesn't follow the naming convention" class="org.baeldung.pmd.UnitTestNamingConventionRule">
<rule name="UnitTestMustFollowNamingConventionRule" message="Unit test class names need to end in 'UnitTest', integration tests with 'IntegrationTest', etc " class="org.baeldung.pmd.UnitTestNamingConventionRule">
<description>Test does not follow Baeldung naming convention</description>
<priority>3</priority>
</rule>

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@ -1,2 +1,3 @@
### Relevant Articles:
- [CDI Interceptor vs Spring AspectJ](http://www.baeldung.com/cdi-interceptor-vs-spring-aspectj)
- [An Introduction to CDI (Contexts and Dependency Injection) in Java](http://www.baeldung.com/java-ee-cdi)

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@ -54,3 +54,5 @@
- [An Introduction to Java.util.Hashtable Class](http://www.baeldung.com/java-hash-table)
- [Method Parameter Reflection in Java](http://www.baeldung.com/java-parameter-reflection)
- [Java 8 Unsigned Arithmetic Support](http://www.baeldung.com/java-unsigned-arithmetic)
- [How to Get the Start and the End of a Day using Java](http://www.baeldung.com/java-day-start-end)
- [Generalized Target-Type Inference in Java](http://www.baeldung.com/java-generalized-target-type-inference)

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@ -0,0 +1,54 @@
package com.baeldung.datetime;
import java.time.Duration;
import java.time.Instant;
import java.time.LocalDateTime;
import java.time.ZonedDateTime;
import java.time.temporal.ChronoUnit;
import java.util.Calendar;
import java.util.Date;
import org.apache.commons.lang3.time.DateUtils;
public class AddHoursToDate {
public Date addHoursToJavaUtilDate(Date date, int hours) {
Calendar calendar = Calendar.getInstance();
calendar.setTime(date);
calendar.add(Calendar.HOUR_OF_DAY, hours);
return calendar.getTime();
}
public Date addHoursToDateUsingInstant(Date date, int hours) {
return Date.from(date.toInstant()
.plus(Duration.ofHours(hours)));
}
public LocalDateTime addHoursToLocalDateTime(LocalDateTime localDateTime, int hours) {
return localDateTime.plusHours(hours);
}
public LocalDateTime subtractHoursToLocalDateTime(LocalDateTime localDateTime, int hours) {
return localDateTime.minusHours(hours);
}
public ZonedDateTime addHoursToZonedDateTime(ZonedDateTime zonedDateTime, int hours) {
return zonedDateTime.plusHours(hours);
}
public ZonedDateTime subtractHoursToZonedDateTime(ZonedDateTime zonedDateTime, int hours) {
return zonedDateTime.minusHours(hours);
}
public Instant addHoursToInstant(Instant instant, int hours) {
return instant.plus(hours, ChronoUnit.HOURS);
}
public Instant subtractHoursToInstant(Instant instant, int hours) {
return instant.minus(hours, ChronoUnit.HOURS);
}
public Date addHoursWithApacheCommons(Date date, int hours) {
return DateUtils.addHours(date, hours);
}
}

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@ -0,0 +1,116 @@
package com.baeldung.datetime;
import static org.assertj.core.api.Assertions.assertThat;
import java.time.Instant;
import java.time.LocalDateTime;
import java.time.Month;
import java.time.ZoneId;
import java.time.ZonedDateTime;
import java.util.Calendar;
import java.util.Date;
import java.util.GregorianCalendar;
import org.junit.Test;
public class AddHoursToDateUnitTest {
private final AddHoursToDate addHoursToDateObj = new AddHoursToDate();
@Test
public void givenJavaUtilDate_whenPositiveHours_thenAddHours() {
Date actualDate = new GregorianCalendar(2018, Calendar.JUNE, 25, 5, 0).getTime();
Date expectedDate = new GregorianCalendar(2018, Calendar.JUNE, 25, 7, 0).getTime();
assertThat(addHoursToDateObj.addHoursToJavaUtilDate(actualDate, 2)).isEqualTo(expectedDate);
}
@Test
public void givenJavaUtilDate_whenNegativeHours_thenMinusHours() {
Date actualDate = new GregorianCalendar(2018, Calendar.JUNE, 25, 5, 0).getTime();
Date expectedDate = new GregorianCalendar(2018, Calendar.JUNE, 25, 3, 0).getTime();
assertThat(addHoursToDateObj.addHoursToJavaUtilDate(actualDate, -2)).isEqualTo(expectedDate);
}
@Test
public void givenJavaUtilDate_whenUsingToInstantAndPostiveHours_thenAddHours() {
Date actualDate = new GregorianCalendar(2018, Calendar.JUNE, 25, 5, 0).getTime();
Date expectedDate = new GregorianCalendar(2018, Calendar.JUNE, 25, 7, 0).getTime();
assertThat(addHoursToDateObj.addHoursToDateUsingInstant(actualDate, 2)).isEqualTo(expectedDate);
}
@Test
public void givenJavaUtilDate_whenUsingToInstantAndNegativeHours_thenAddHours() {
Date actualDate = new GregorianCalendar(2018, Calendar.JUNE, 25, 5, 0).getTime();
Date expectedDate = new GregorianCalendar(2018, Calendar.JUNE, 25, 3, 0).getTime();
assertThat(addHoursToDateObj.addHoursToDateUsingInstant(actualDate, -2)).isEqualTo(expectedDate);
}
@Test
public void givenLocalDateTime_whenUsingAddHoursToLocalDateTime_thenAddHours() {
LocalDateTime actualDateTime = LocalDateTime.of(2018, Month.JUNE, 25, 5, 0);
LocalDateTime expectedDateTime = LocalDateTime.of(2018, Month.JUNE, 25, 7, 0);
assertThat(addHoursToDateObj.addHoursToLocalDateTime(actualDateTime, 2)).isEqualTo(expectedDateTime);
}
@Test
public void givenLocalDateTime_whenUsingMinusHoursToLocalDateTime_thenMinusHours() {
LocalDateTime actualDateTime = LocalDateTime.of(2018, Month.JUNE, 25, 5, 0);
LocalDateTime expectedDateTime = LocalDateTime.of(2018, Month.JUNE, 25, 3, 0);
assertThat(addHoursToDateObj.subtractHoursToLocalDateTime(actualDateTime, 2)).isEqualTo(expectedDateTime);
}
@Test
public void givenZonedDateTime_whenUsingAddHoursToZonedDateTime_thenAddHours() {
ZonedDateTime actualZonedDateTime = ZonedDateTime.of(LocalDateTime.of(2018, Month.JUNE, 25, 5, 0), ZoneId.systemDefault());
ZonedDateTime expectedZonedDateTime = ZonedDateTime.of(LocalDateTime.of(2018, Month.JUNE, 25, 7, 0), ZoneId.systemDefault());
assertThat(addHoursToDateObj.addHoursToZonedDateTime(actualZonedDateTime, 2)).isEqualTo(expectedZonedDateTime);
}
@Test
public void givenZonedDateTime_whenUsingMinusHoursToZonedDateTime_thenMinusHours() {
ZonedDateTime actualZonedDateTime = ZonedDateTime.of(LocalDateTime.of(2018, Month.JUNE, 25, 5, 0), ZoneId.systemDefault());
ZonedDateTime expectedZonedDateTime = ZonedDateTime.of(LocalDateTime.of(2018, Month.JUNE, 25, 3, 0), ZoneId.systemDefault());
assertThat(addHoursToDateObj.subtractHoursToZonedDateTime(actualZonedDateTime, 2)).isEqualTo(expectedZonedDateTime);
}
@Test
public void givenJavaUtilDate_whenUsingPositiveHrsAndAddHoursWithApacheCommons_thenAddHours() {
Date actualDate = new GregorianCalendar(2018, Calendar.JUNE, 25, 5, 0).getTime();
Date expectedDate = new GregorianCalendar(2018, Calendar.JUNE, 25, 7, 0).getTime();
assertThat(addHoursToDateObj.addHoursWithApacheCommons(actualDate, 2)).isEqualTo(expectedDate);
}
@Test
public void givenJavaUtilDate_whenUsingNegativeHrsAndAddHoursWithApacheCommons_thenMinusHours() {
Date actualDate = new GregorianCalendar(2018, Calendar.JUNE, 25, 7, 0).getTime();
Date expectedDate = new GregorianCalendar(2018, Calendar.JUNE, 25, 5, 0).getTime();
assertThat(addHoursToDateObj.addHoursWithApacheCommons(actualDate, -2)).isEqualTo(expectedDate);
}
@Test
public void givenInstant_whenUsingAddHoursToInstant_thenAddHours() {
Instant actualValue = Instant.parse("2018-06-25T05:12:35Z");
Instant expectedValue = Instant.parse("2018-06-25T07:12:35Z");
assertThat(addHoursToDateObj.addHoursToInstant(actualValue, 2)).isEqualTo(expectedValue);
}
@Test
public void givenInstant_whenUsingSubtractHoursToInstant_thenMinusHours() {
Instant actualValue = Instant.parse("2018-06-25T07:12:35Z");
Instant expectedValue = Instant.parse("2018-06-25T05:12:35Z");
assertThat(addHoursToDateObj.subtractHoursToInstant(actualValue, 2)).isEqualTo(expectedValue);
}
}

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@ -0,0 +1,43 @@
package com.baeldung.fileToBase64StringConversion;
import static org.junit.Assert.assertTrue;
import java.io.File;
import java.io.IOException;
import java.util.Base64;
import org.apache.commons.io.FileUtils;
import org.junit.Test;
public class FileToBase64StringConversionUnitTest {
private String inputFilePath = "test_image.jpg";
private String outputFilePath = "test_image_copy.jpg";
@Test
public void fileToBase64StringConversion() throws IOException {
//load file from /src/test/resources
ClassLoader classLoader = getClass().getClassLoader();
File inputFile = new File(classLoader
.getResource(inputFilePath)
.getFile());
byte[] fileContent = FileUtils.readFileToByteArray(inputFile);
String encodedString = Base64
.getEncoder()
.encodeToString(fileContent);
//create output file
File outputFile = new File(inputFile
.getParentFile()
.getAbsolutePath() + File.pathSeparator + outputFilePath);
// decode the string and write to file
byte[] decodedBytes = Base64
.getDecoder()
.decode(encodedString);
FileUtils.writeByteArrayToFile(outputFile, decodedBytes);
assertTrue(FileUtils.contentEquals(inputFile, outputFile));
}
}

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@ -0,0 +1,80 @@
package com.baeldung.java.list;
import java.util.Collections;
import java.util.List;
import java.util.ListIterator;
import org.apache.commons.collections4.iterators.ReverseListIterator;
import com.google.common.collect.Lists;
/**
* Provides methods for iterating backward over a list.
*/
public class ReverseIterator {
/**
* Iterate using the for loop.
*
* @param list the list
*/
public void iterateUsingForLoop(final List<String> list) {
for (int i = list.size(); i-- > 0; ) {
System.out.println(list.get(i));
}
}
/**
* Iterate using the Java {@link ListIterator}.
*
* @param list the list
*/
public void iterateUsingListIterator(final List<String> list) {
final ListIterator listIterator = list.listIterator(list.size());
while (listIterator.hasPrevious()) {
System.out.println(listIterator.previous());
}
}
/**
* Iterate using Java {@link Collections} API.
*
* @param list the list
*/
public void iterateUsingCollections(final List<String> list) {
Collections.reverse(list);
for (final String item : list) {
System.out.println(item);
}
}
/**
* Iterate using Apache Commons {@link ReverseListIterator}.
*
* @param list the list
*/
public void iterateUsingApacheReverseListIterator(final List<String> list) {
final ReverseListIterator listIterator = new ReverseListIterator(list);
while (listIterator.hasNext()) {
System.out.println(listIterator.next());
}
}
/**
* Iterate using Guava {@link Lists} API.
*
* @param list the list
*/
public void iterateUsingGuava(final List<String> list) {
final List<String> reversedList = Lists.reverse(list);
for (final String item : reversedList) {
System.out.println(item);
}
}
}

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@ -0,0 +1,87 @@
package com.baeldung.java.list;
import static org.junit.Assert.assertEquals;
import java.util.Collections;
import java.util.List;
import java.util.ListIterator;
import org.apache.commons.collections4.iterators.ReverseListIterator;
import org.apache.commons.lang3.StringUtils;
import org.junit.jupiter.api.BeforeEach;
import org.junit.jupiter.api.Test;
import com.google.common.collect.Lists;
public class ReverseIteratorUnitTest {
private final ReverseIterator reverseIterator = new ReverseIterator();
private List<String> list;
private final String originalString = "ABCDE";
@BeforeEach
void setUp() {
list = Lists.newArrayList("A", "B", "C", "D", "E");
}
@Test
void whenIteratingUsingForLoop_thenCorrect() {
String reverseString = "";
for (int i = list.size(); i-- > 0; ) {
reverseString += list.get(i);
}
assertEquals(reverseString, StringUtils.reverse(originalString));
}
@Test
void whenIteratingUsingListIterator_thenCorrect() {
String reverseString = "";
final ListIterator listIterator = list.listIterator(list.size());
while (listIterator.hasPrevious()) {
reverseString += listIterator.previous();
}
assertEquals(reverseString, StringUtils.reverse(originalString));
}
@Test
void whenIteratingUsingCollections_thenCorrect() {
String reverseString = "";
Collections.reverse(list);
for (final String item : list) {
reverseString += item;
}
assertEquals(reverseString, StringUtils.reverse(originalString));
assertEquals("E", list.get(0));
}
@Test
void whenIteratingUsingApacheReverseListIterator_thenCorrect() {
String reverseString = "";
final ReverseListIterator listIterator = new ReverseListIterator(list);
while (listIterator.hasNext()) {
reverseString += listIterator.next();
}
assertEquals(reverseString, StringUtils.reverse(originalString));
}
@Test
void whenIteratingUsingGuava_thenCorrect() {
String reverseString = "";
final List<String> reversedList = Lists.reverse(list);
for (final String item : reversedList) {
reverseString += item;
}
assertEquals(reverseString, StringUtils.reverse(originalString));
assertEquals("A", list.get(0));
}
}

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@ -0,0 +1,54 @@
package com.baeldung.symlink;
import java.io.IOException;
import java.nio.charset.StandardCharsets;
import java.nio.file.DirectoryStream;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import static java.nio.file.StandardOpenOption.*;
import java.util.stream.IntStream;
public class SymLinkExample {
public void createSymbolicLink(Path link, Path target) throws IOException {
if (Files.exists(link)) {
Files.delete(link);
}
Files.createSymbolicLink(link, target);
}
public void createHardLink(Path link, Path target) throws IOException {
if (Files.exists(link)) {
Files.delete(link);
}
Files.createLink(link, target);
}
public Path createTextFile() throws IOException {
byte[] content = IntStream.range(0, 10000)
.mapToObj(i -> i + System.lineSeparator())
.reduce("", String::concat)
.getBytes(StandardCharsets.UTF_8);
Path filePath = Paths.get(".", "target_link.txt");
Files.write(filePath, content, CREATE, TRUNCATE_EXISTING);
return filePath;
}
public void printLinkFiles(Path path) throws IOException {
try (DirectoryStream<Path> stream = Files.newDirectoryStream(path)) {
for (Path file : stream) {
if (Files.isDirectory(file)) {
printLinkFiles(file);
} else if (Files.isSymbolicLink(file)) {
System.out.format("File link '%s' with target '%s'%n", file, Files.readSymbolicLink(file));
}
}
}
}
public static void main(String[] args) throws IOException {
new SymLinkExample().printLinkFiles(Paths.get("."));
}
}

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@ -0,0 +1,36 @@
package com.baeldung.symlink;
import static org.junit.Assert.*;
import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import org.junit.Test;
public class SymLinkExampleUnitTest {
@Test
public void whenUsingFiles_thenCreateSymbolicLink() throws IOException {
SymLinkExample example = new SymLinkExample();
Path filePath = example.createTextFile();
Path linkPath = Paths.get(".", "symbolic_link.txt");
example.createSymbolicLink(linkPath, filePath);
assertTrue(Files.isSymbolicLink(linkPath));
}
@Test
public void whenUsingFiles_thenCreateHardLink() throws IOException {
SymLinkExample example = new SymLinkExample();
Path filePath = example.createTextFile();
Path linkPath = Paths.get(".", "hard_link.txt");
example.createHardLink(linkPath, filePath);
assertFalse(Files.isSymbolicLink(linkPath));
assertEquals(filePath.toFile()
.length(),
linkPath.toFile()
.length());
}
}

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@ -14,8 +14,10 @@ import org.slf4j.LoggerFactory;
import java.io.*;
import java.nio.charset.Charset;
import java.nio.charset.StandardCharsets;
import java.nio.file.Path;
import java.nio.file.StandardCopyOption;
import java.util.Scanner;
import java.util.UUID;
import static org.apache.commons.lang3.RandomStringUtils.randomAlphabetic;
import static org.hamcrest.Matchers.equalTo;
@ -112,6 +114,19 @@ public class JavaInputStreamToXUnitTest {
assertThat(writer.toString(), equalTo(originalString));
}
@Test
public final void givenUsingTempFile_whenConvertingAnInputStreamToAString_thenCorrect() throws IOException {
final String originalString = randomAlphabetic(DEFAULT_SIZE);
final InputStream inputStream = new ByteArrayInputStream(originalString.getBytes());
// When
Path tempFile = java.nio.file.Files.createTempDirectory("").resolve(UUID.randomUUID().toString() + ".tmp");
java.nio.file.Files.copy(inputStream, tempFile, StandardCopyOption.REPLACE_EXISTING);
String result = new String(java.nio.file.Files.readAllBytes(tempFile));
assertThat(result, equalTo(originalString));
}
// tests - InputStream to byte[]
@Test

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@ -160,3 +160,10 @@
- [Guide to the super Java Keyword](http://www.baeldung.com/java-super)
- [Guide to the this Java Keyword](http://www.baeldung.com/java-this)
- [Jagged Arrays In Java](http://www.baeldung.com/java-jagged-arrays)
- [Importance of Main Manifest Attribute in a Self-Executing JAR](http://www.baeldung.com/java-jar-executable-manifest-main-class)
- [Extracting Year, Month and Day from Date in Java](http://www.baeldung.com/java-year-month-day)
- [Get Date Without Time in Java](http://www.baeldung.com/java-date-without-time)
- [Convert a String to Title Case](http://www.baeldung.com/java-string-title-case)
- [How to Get the File Extension of a File in Java](http://www.baeldung.com/java-file-extension)
- [Immutable Objects in Java](http://www.baeldung.com/java-immutable-object)
- [Console I/O in Java](http://www.baeldung.com/java-console-input-output)

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@ -10,8 +10,8 @@
<parent>
<groupId>com.baeldung</groupId>
<artifactId>parent-java</artifactId>
<version>0.0.1-SNAPSHOT</version>
<relativePath>../parent-java</relativePath>
<version>0.0.1-SNAPSHOT</version>
<relativePath>../parent-java</relativePath>
</parent>
<dependencies>
@ -197,12 +197,7 @@
<groupId>javax.mail</groupId>
<artifactId>mail</artifactId>
<version>${javax.mail.version}</version>
</dependency>
<dependency>
<groupId>javax.mail</groupId>
<artifactId>mail</artifactId>
<version>1.5.0-b01</version>
</dependency>
</dependency>
<dependency>
<groupId>com.ibm.icu</groupId>
<artifactId>icu4j</artifactId>
@ -255,6 +250,7 @@
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-jar-plugin</artifactId>
<version>${maven-jar-plugin.version}</version>
<configuration>
<archive>
<manifest>
@ -293,6 +289,7 @@
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-shade-plugin</artifactId>
<version>${maven-shade-plugin.version}</version>
<executions>
<execution>
<goals>
@ -314,6 +311,7 @@
<plugin>
<groupId>com.jolira</groupId>
<artifactId>onejar-maven-plugin</artifactId>
<version>${onejar-maven-plugin.version}</version>
<executions>
<execution>
<configuration>
@ -331,6 +329,7 @@
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
<version>${spring-boot-maven-plugin.version}</version>
<executions>
<execution>
<goals>
@ -478,6 +477,10 @@
<maven-javadoc-plugin.version>3.0.0-M1</maven-javadoc-plugin.version>
<exec-maven-plugin.version>1.6.0</exec-maven-plugin.version>
<javax.mail.version>1.5.0-b01</javax.mail.version>
<maven-jar-plugin.version>3.0.2</maven-jar-plugin.version>
<onejar-maven-plugin.version>1.4.4</onejar-maven-plugin.version>
<maven-shade-plugin.version>3.1.1</maven-shade-plugin.version>
<spring-boot-maven-plugin.version>2.0.3.RELEASE</spring-boot-maven-plugin.version>
<icu4j.version>61.1</icu4j.version>
</properties>

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@ -0,0 +1,26 @@
package com.baeldung.console;
import java.io.Console;
public class ConsoleConsoleClass {
public static void main(String[] args) {
Console console = System.console();
if (console == null) {
System.out.print("No console available");
return;
}
String progLanguauge = console.readLine("Enter your favourite programming language: ");
console.printf(progLanguauge + " is very interesting!");
char[] pass = console.readPassword("To finish, enter password: ");
if ("BAELDUNG".equals(pass.toString().toUpperCase()))
console.printf("Good! Regards!");
else
console.printf("Nice try. Regards.");
}
}

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@ -0,0 +1,76 @@
package com.baeldung.console;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.Scanner;
import java.util.regex.Pattern;
public class ConsoleScannerClass {
public static void main(String[] args) {
System.out.println("Please enter your name and surname: ");
Scanner scanner = new Scanner(System.in);
String nameSurname = scanner.nextLine();
System.out.println("Please enter your gender: ");
char gender = scanner.next().charAt(0);
System.out.println("Please enter your age: ");
int age = scanner.nextInt();
System.out.println("Please enter your height in meters: ");
double height = scanner.nextDouble();
System.out.println(nameSurname + ", " + age + ", is a great " + (gender == 'm' ? "guy" : "girl") + " with " + height + " meters height" + " and " + (gender == 'm' ? "he" : "she") + " reads Baeldung.");
System.out.print("Have a good");
System.out.print(" one!");
System.out.println("\nPlease enter number of years of experience as a developer: ");
BufferedReader buffReader = new BufferedReader(new InputStreamReader(System.in));
int i = 0;
try {
i = Integer.parseInt(buffReader.readLine());
} catch (NumberFormatException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
System.out.println("You are a " + (i > 5 ? "great" : "good") + " developer!");
int sum = 0, count = 0;
System.out.println("Please enter your college degrees. To finish, enter baeldung website url");
while (scanner.hasNextInt()) {
int nmbr = scanner.nextInt();
sum += nmbr;
count++;
}
int mean = sum / count;
System.out.println("Your average degree is " + mean);
if (scanner.hasNext(Pattern.compile("www.baeldung.com")))
System.out.println("Correct!");
else
System.out.println("Baeldung website url is www.baeldung.com");
if (scanner != null)
scanner.close();
}
}

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@ -0,0 +1,43 @@
package com.baeldung.customexception;
import java.io.File;
import java.io.FileNotFoundException;
import java.util.Scanner;
public class FileManager {
public static String getFirstLine(String fileName) throws IncorrectFileNameException {
try (Scanner file = new Scanner(new File(fileName))) {
if (file.hasNextLine()) {
return file.nextLine();
} else {
throw new IllegalArgumentException("Non readable file");
}
} catch (FileNotFoundException err) {
if (!isCorrectFileName(fileName)) {
throw new IncorrectFileNameException("Incorrect filename : " + fileName, err);
}
// Logging etc
} catch (IllegalArgumentException err) {
if (!containsExtension(fileName)) {
throw new IncorrectFileExtensionException("Filename does not contain extension : " + fileName, err);
}
// Other error cases and logging
}
return "Default First Line";
}
private static boolean containsExtension(String fileName) {
if (fileName.contains(".txt") || fileName.contains(".doc"))
return true;
return false;
}
private static boolean isCorrectFileName(String fileName) {
if (fileName.equals("wrongFileName.txt"))
return false;
else
return true;
}
}

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@ -0,0 +1,9 @@
package com.baeldung.customexception;
public class IncorrectFileExtensionException extends RuntimeException{
private static final long serialVersionUID = 1L;
public IncorrectFileExtensionException(String errorMessage, Throwable err) {
super(errorMessage, err);
}
}

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@ -0,0 +1,9 @@
package com.baeldung.customexception;
public class IncorrectFileNameException extends Exception {
private static final long serialVersionUID = 1L;
public IncorrectFileNameException(String errorMessage, Throwable err) {
super(errorMessage, err);
}
}

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@ -0,0 +1,60 @@
package com.baeldung.encrypt;
import javax.crypto.*;
import javax.crypto.spec.IvParameterSpec;
import java.io.*;
import java.security.InvalidAlgorithmParameterException;
import java.security.InvalidKeyException;
import java.security.NoSuchAlgorithmException;
class FileEncrypterDecrypter {
private SecretKey secretKey;
private Cipher cipher;
FileEncrypterDecrypter(SecretKey secretKey, String cipher) throws NoSuchPaddingException, NoSuchAlgorithmException {
this.secretKey = secretKey;
this.cipher = Cipher.getInstance(cipher);
}
void encrypt(String content, String fileName) throws InvalidKeyException, IOException {
cipher.init(Cipher.ENCRYPT_MODE, secretKey);
byte[] iv = cipher.getIV();
try (
FileOutputStream fileOut = new FileOutputStream(fileName);
CipherOutputStream cipherOut = new CipherOutputStream(fileOut, cipher)
) {
fileOut.write(iv);
cipherOut.write(content.getBytes());
}
}
String decrypt(String fileName) throws InvalidAlgorithmParameterException, InvalidKeyException, IOException {
String content;
try (FileInputStream fileIn = new FileInputStream(fileName)) {
byte[] fileIv = new byte[16];
fileIn.read(fileIv);
cipher.init(Cipher.DECRYPT_MODE, secretKey, new IvParameterSpec(fileIv));
try (
CipherInputStream cipherIn = new CipherInputStream(fileIn, cipher);
InputStreamReader inputReader = new InputStreamReader(cipherIn);
BufferedReader reader = new BufferedReader(inputReader)
) {
StringBuilder sb = new StringBuilder();
String line;
while ((line = reader.readLine()) != null) {
sb.append(line);
}
content = sb.toString();
}
}
return content;
}
}

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package com.baeldung.exceptions;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
public class Arithmetic {
private static Logger LOGGER = LoggerFactory.getLogger(Arithmetic.class);
public static void main(String[] args) {
try {
int result = 30 / 0; // Trying to divide by zero
} catch (ArithmeticException e) {
LOGGER.error("ArithmeticException caught!");
}
}
}

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package com.baeldung.exceptions;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
public class ArrayIndexOutOfBounds {
private static Logger LOGGER = LoggerFactory.getLogger(ArrayIndexOutOfBounds.class);
public static void main(String[] args) {
int[] nums = new int[] { 1, 2, 3 };
try {
int numFromNegativeIndex = nums[-1]; // Trying to access at negative index
int numFromGreaterIndex = nums[4]; // Trying to access at greater index
int numFromLengthIndex = nums[3]; // Trying to access at index equal to size of the array
} catch (ArrayIndexOutOfBoundsException e) {
LOGGER.error("ArrayIndexOutOfBoundsException caught");
}
}
}

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package com.baeldung.exceptions;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
class Animal {
}
class Dog extends Animal {
}
class Lion extends Animal {
}
public class ClassCast {
private static Logger LOGGER = LoggerFactory.getLogger(ClassCast.class);
public static void main(String[] args) {
try {
Animal animalOne = new Dog(); // At runtime the instance is dog
Dog bruno = (Dog) animalOne; // Downcasting
Animal animalTwo = new Lion(); // At runtime the instance is animal
Dog tommy = (Dog) animalTwo; // Downcasting
} catch (ClassCastException e) {
LOGGER.error("ClassCastException caught!");
}
}
}

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package com.baeldung.exceptions;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileReader;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
public class FileNotFound {
private static Logger LOGGER = LoggerFactory.getLogger(FileNotFound.class);
public static void main(String[] args) {
BufferedReader reader = null;
try {
reader = new BufferedReader(new FileReader(new File("/invalid/file/location")));
} catch (FileNotFoundException e) {
LOGGER.error("FileNotFoundException caught!");
}
}
}

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package com.baeldung.exceptions;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
public class GlobalExceptionHandler {
public static void main(String[] args) {
Handler globalExceptionHandler = new Handler();
Thread.setDefaultUncaughtExceptionHandler(globalExceptionHandler);
new GlobalExceptionHandler().performArithmeticOperation(10, 0);
}
public int performArithmeticOperation(int num1, int num2) {
return num1/num2;
}
}
class Handler implements Thread.UncaughtExceptionHandler {
private static Logger LOGGER = LoggerFactory.getLogger(Handler.class);
public void uncaughtException(Thread t, Throwable e) {
LOGGER.info("Unhandled exception caught!");
}
}

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package com.baeldung.exceptions;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
public class IllegalArgument {
private static Logger LOGGER = LoggerFactory.getLogger(IllegalArgument.class);
public static void main(String[] args) {
try {
Thread.sleep(-1000);
} catch (InterruptedException e) {
LOGGER.error("IllegalArgumentException caught!");
}
}
}

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package com.baeldung.exceptions;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
public class IllegalState {
private static Logger LOGGER = LoggerFactory.getLogger(IllegalState.class);
public static void main(String[] args) {
List<Integer> intList = new ArrayList<>();
for (int i = 0; i < 10; i++) {
intList.add(i);
}
Iterator<Integer> intListIterator = intList.iterator(); // Initialized with index at -1
try {
intListIterator.remove(); // IllegalStateException
} catch (IllegalStateException e) {
LOGGER.error("IllegalStateException caught!");
}
}
}

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package com.baeldung.exceptions;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
class ChildThread extends Thread {
private static Logger LOGGER = LoggerFactory.getLogger(ChildThread.class);
public void run() {
try {
Thread.sleep(1000);
} catch (InterruptedException e) {
LOGGER.error("InterruptedException caught!");
}
}
}
public class InterruptedExceptionExample {
public static void main(String[] args) throws InterruptedException {
ChildThread childThread = new ChildThread();
childThread.start();
childThread.interrupt();
}
}

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package com.baeldung.exceptions;
import java.net.MalformedURLException;
import java.net.URL;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
public class MalformedURL {
private static Logger LOGGER = LoggerFactory.getLogger(MalformedURL.class);
public static void main(String[] args) {
URL baeldungURL = null;
try {
baeldungURL = new URL("malformedurl");
} catch (MalformedURLException e) {
LOGGER.error("MalformedURLException caught!");
}
}
}

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package com.baeldung.exceptions;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
public class NullPointer {
private static Logger LOGGER = LoggerFactory.getLogger(NullPointer.class);
public static void main(String[] args) {
Person personObj = null;
try {
String name = personObj.personName; // Accessing the field of a null object
personObj.personName = "Jon Doe"; // Modifying the field of a null object
} catch (NullPointerException e) {
LOGGER.error("NullPointerException caught!");
}
}
}
class Person {
public String personName;
public String getPersonName() {
return personName;
}
public void setPersonName(String personName) {
this.personName = personName;
}
}

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package com.baeldung.exceptions;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
public class NumberFormat {
private static Logger LOGGER = LoggerFactory.getLogger(NumberFormat.class);
public static void main(String[] args) {
String str1 = "100ABCD";
try {
int x = Integer.parseInt(str1); // Converting string with inappropriate format
int y = Integer.valueOf(str1);
} catch (NumberFormatException e) {
LOGGER.error("NumberFormatException caught!");
}
}
}

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package com.baeldung.exceptions;
import java.text.DateFormat;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
public class ParseExceptionExample {
private static Logger LOGGER = LoggerFactory.getLogger(ParseExceptionExample.class);
public static void main(String[] args) {
DateFormat format = new SimpleDateFormat("MM, dd, yyyy");
try {
format.parse("01, , 2010");
} catch (ParseException e) {
LOGGER.error("ParseException caught!");
}
}
}

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package com.baeldung.exceptions;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
public class StringIndexOutOfBounds {
private static Logger LOGGER = LoggerFactory.getLogger(StringIndexOutOfBounds.class);
public static void main(String[] args) {
String str = "Hello World";
try {
char charAtNegativeIndex = str.charAt(-1); // Trying to access at negative index
char charAtLengthIndex = str.charAt(11); // Trying to access at index equal to size of the string
} catch (StringIndexOutOfBoundsException e) {
LOGGER.error("StringIndexOutOfBoundsException caught");
}
}
}

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package com.baeldung.gregorian.calendar;
import java.time.format.DateTimeFormatter;
import java.util.Calendar;
import java.util.Collections;
import java.util.Date;
import java.util.GregorianCalendar;
import java.util.HashSet;
import java.util.Locale;
import java.util.Set;
import java.util.TimeZone;
import javax.xml.datatype.DatatypeConfigurationException;
import javax.xml.datatype.DatatypeFactory;
import javax.xml.datatype.XMLGregorianCalendar;
public class GregorianCalendarExample {
public Date setMonth(GregorianCalendar calendar, int amount) {
calendar.set(Calendar.MONTH, amount);
return calendar.getTime();
}
public Date rollAdd(GregorianCalendar calendar, int amount) {
calendar.roll(GregorianCalendar.MONTH, amount);
return calendar.getTime();
}
public boolean isLeapYearExample(int year) {
GregorianCalendar cal = (GregorianCalendar) GregorianCalendar.getInstance();
return cal.isLeapYear(year);
}
public Date subtractDays(GregorianCalendar calendar, int daysToSubtract) {
GregorianCalendar cal = calendar;
cal.add(Calendar.DATE, -daysToSubtract);
return cal.getTime();
}
public Date addDays(GregorianCalendar calendar, int daysToAdd) {
GregorianCalendar cal = calendar;
cal.add(Calendar.DATE, daysToAdd);
return cal.getTime();
}
public XMLGregorianCalendar toXMLGregorianCalendar(GregorianCalendar calendar) throws DatatypeConfigurationException {
DatatypeFactory datatypeFactory = DatatypeFactory.newInstance();
return datatypeFactory.newXMLGregorianCalendar(calendar);
}
public Date toDate(XMLGregorianCalendar calendar) {
return calendar.toGregorianCalendar()
.getTime();
}
public int compareDates(GregorianCalendar firstDate, GregorianCalendar secondDate) {
return firstDate.compareTo(secondDate);
}
public String formatDate(GregorianCalendar calendar) {
return calendar.toZonedDateTime()
.format(DateTimeFormatter.ofPattern("d MMM uuuu"));
}
}

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package com.baeldung.customexception;
import static org.assertj.core.api.Assertions.assertThat;
import java.io.File;
import org.junit.Test;
public class IncorrectFileExtensionExceptionUnitTest {
@Test
public void testWhenCorrectFileExtensionGiven_ReceivesNoException() throws IncorrectFileNameException {
assertThat(FileManager.getFirstLine("correctFileNameWithProperExtension.txt")).isEqualTo("Default First Line");
}
@Test(expected = IncorrectFileExtensionException.class)
public void testWhenCorrectFileNameExceptionThrown_ReceivesNoException() throws IncorrectFileNameException {
StringBuffer sBuffer = new StringBuffer();
sBuffer.append("src");
sBuffer.append(File.separator);
sBuffer.append("test");
sBuffer.append(File.separator);
sBuffer.append("resources");
sBuffer.append(File.separator);
sBuffer.append("correctFileNameWithoutProperExtension");
FileManager.getFirstLine(sBuffer.toString());
}
}

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package com.baeldung.customexception;
import static org.assertj.core.api.Assertions.assertThat;
import org.junit.Test;
public class IncorrectFileNameExceptionUnitTest {
@Test(expected = IncorrectFileNameException.class)
public void testWhenIncorrectFileNameExceptionThrown_ReceivesIncorrectFileNameException() throws IncorrectFileNameException {
FileManager.getFirstLine("wrongFileName.txt");
}
@Test
public void testWhenCorrectFileNameExceptionThrown_ReceivesNoException() throws IncorrectFileNameException {
assertThat(FileManager.getFirstLine("correctFileName.txt")).isEqualTo("Default First Line");
}
}

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package com.baeldung.encrypt;
import org.junit.Test;
import javax.crypto.KeyGenerator;
import javax.crypto.NoSuchPaddingException;
import javax.crypto.SecretKey;
import java.io.File;
import java.io.IOException;
import java.security.InvalidAlgorithmParameterException;
import java.security.InvalidKeyException;
import java.security.NoSuchAlgorithmException;
import static org.hamcrest.Matchers.is;
import static org.junit.Assert.assertThat;
public class FileEncrypterDecrypterIntegrationTest {
@Test
public void givenStringAndFilename_whenEncryptingIntoFile_andDecryptingFileAgain_thenOriginalStringIsReturned() throws NoSuchAlgorithmException, NoSuchPaddingException, InvalidKeyException, IOException, InvalidAlgorithmParameterException {
String originalContent = "foobar";
SecretKey secretKey = KeyGenerator.getInstance("AES").generateKey();
FileEncrypterDecrypter fileEncrypterDecrypter = new FileEncrypterDecrypter(secretKey, "AES/CBC/PKCS5Padding");
fileEncrypterDecrypter.encrypt(originalContent, "baz.enc");
String decryptedContent = fileEncrypterDecrypter.decrypt("baz.enc");
assertThat(decryptedContent, is(originalContent));
new File("baz.enc").delete(); // cleanup
}
}

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package com.baeldung.exceptions;
import org.junit.After;
import org.junit.Before;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.mockito.ArgumentCaptor;
import org.mockito.Captor;
import org.mockito.Mock;
import org.mockito.junit.MockitoJUnitRunner;
import org.slf4j.LoggerFactory;
import ch.qos.logback.classic.Level;
import ch.qos.logback.classic.Logger;
import ch.qos.logback.classic.spi.ILoggingEvent;
import ch.qos.logback.classic.spi.LoggingEvent;
import ch.qos.logback.core.Appender;
import static org.assertj.core.api.Assertions.assertThat;
import static org.mockito.Mockito.verify;
@RunWith(MockitoJUnitRunner.class)
public class GlobalExceptionHandlerUnitTest {
@Mock
private Appender<ILoggingEvent> mockAppender;
@Captor
private ArgumentCaptor<LoggingEvent> captorLoggingEvent;
@Before
public void setup() {
final Logger logger = (Logger) LoggerFactory.getLogger(Logger.ROOT_LOGGER_NAME);
logger.addAppender(mockAppender);
Handler globalExceptionHandler = new Handler();
Thread.setDefaultUncaughtExceptionHandler(globalExceptionHandler);
}
@After
public void teardown() {
final Logger logger = (Logger) LoggerFactory.getLogger(Logger.ROOT_LOGGER_NAME);
logger.detachAppender(mockAppender);
}
@Test
public void whenArithmeticException_thenUseUncaughtExceptionHandler() throws InterruptedException {
Thread globalExceptionHandlerThread = new Thread() {
public void run() {
GlobalExceptionHandler globalExceptionHandlerObj = new GlobalExceptionHandler();
globalExceptionHandlerObj.performArithmeticOperation(99, 0);
}
};
globalExceptionHandlerThread.start();
globalExceptionHandlerThread.join();
verify(mockAppender).doAppend(captorLoggingEvent.capture());
LoggingEvent loggingEvent = captorLoggingEvent.getValue();
assertThat(loggingEvent.getLevel()).isEqualTo(Level.INFO);
assertThat(loggingEvent.getFormattedMessage()).isEqualTo("Unhandled exception caught!");
}
}

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package com.baeldung.gregorian.calendar;
import static org.junit.Assert.*;
import java.time.format.DateTimeFormatter;
import java.util.Calendar;
import java.util.Date;
import java.util.GregorianCalendar;
import java.util.Locale;
import java.util.TimeZone;
import javax.xml.datatype.DatatypeConfigurationException;
import javax.xml.datatype.DatatypeFactory;
import javax.xml.datatype.XMLGregorianCalendar;
import org.junit.Test;
import com.baeldung.gregorian.calendar.GregorianCalendarExample;
public class GregorianCalendarTester {
@Test
public void test_Calendar_Return_Type_Valid() {
Calendar calendar = Calendar.getInstance();
assert ("gregory".equals(calendar.getCalendarType()));
}
@Test
public void test_Calendar_Return_Type_InValid() {
Calendar calendar = Calendar.getInstance();
assertNotEquals("gregorys", calendar.getCalendarType());
}
@Test(expected = ClassCastException.class)
public void test_Class_Cast_Exception() {
TimeZone tz = TimeZone.getTimeZone("GMT+9:00");
Locale loc = new Locale("ja", "JP", "JP");
Calendar calendar = Calendar.getInstance(loc);
GregorianCalendar gc = (GregorianCalendar) calendar;
}
@Test
public void test_Getting_Calendar_information() {
GregorianCalendar calendar = new GregorianCalendar(2018, 5, 28);
assertTrue(false == calendar.isLeapYear(calendar.YEAR));
assertTrue(52 == calendar.getWeeksInWeekYear());
assertTrue(2018 == calendar.getWeekYear());
assertTrue(30 == calendar.getActualMaximum(calendar.DAY_OF_MONTH));
assertTrue(1 == calendar.getActualMinimum(calendar.DAY_OF_MONTH));
assertTrue(1 == calendar.getGreatestMinimum(calendar.DAY_OF_MONTH));
assertTrue(28 == calendar.getLeastMaximum(calendar.DAY_OF_MONTH));
assertTrue(31 == calendar.getMaximum(calendar.DAY_OF_MONTH));
assertTrue(1 == calendar.getMinimum(calendar.DAY_OF_MONTH));
assertTrue(52 == calendar.getWeeksInWeekYear());
}
@Test
public void test_Compare_Date_FirstDate_Greater_SecondDate() {
GregorianCalendar firstDate = new GregorianCalendar(2018, 6, 28);
GregorianCalendar secondDate = new GregorianCalendar(2018, 5, 28);
assertTrue(1 == firstDate.compareTo(secondDate));
}
@Test
public void test_Compare_Date_FirstDate_Smaller_SecondDate() {
GregorianCalendar firstDate = new GregorianCalendar(2018, 5, 28);
GregorianCalendar secondDate = new GregorianCalendar(2018, 6, 28);
assertTrue(-1 == firstDate.compareTo(secondDate));
}
@Test
public void test_Compare_Date_Both_Dates_Equal() {
GregorianCalendar firstDate = new GregorianCalendar(2018, 6, 28);
GregorianCalendar secondDate = new GregorianCalendar(2018, 6, 28);
assertTrue(0 == firstDate.compareTo(secondDate));
}
@Test
public void test_date_format() {
GregorianCalendarExample calendarDemo = new GregorianCalendarExample();
GregorianCalendar calendar = new GregorianCalendar(2018, 6, 28);
assertEquals("28 Jul 2018", calendarDemo.formatDate(calendar));
}
@Test
public void test_dateFormatdMMMuuuu() {
String expectedDate = new GregorianCalendar(2018, 6, 28).toZonedDateTime()
.format(DateTimeFormatter.ofPattern("d MMM uuuu"));
assertEquals("28 Jul 2018", expectedDate);
}
@Test
public void test_addDays() {
GregorianCalendarExample calendarDemo = new GregorianCalendarExample();
GregorianCalendar calendarActual = new GregorianCalendar(2018, 6, 28);
GregorianCalendar calendarExpected = new GregorianCalendar(2018, 6, 28);
calendarExpected.add(Calendar.DATE, 1);
Date expectedDate = calendarExpected.getTime();
assertEquals(expectedDate, calendarDemo.addDays(calendarActual, 1));
}
@Test
public void test_whenAddOneDay_thenMonthIsChanged() {
final int finalDay1 = 1;
final int finalMonthJul = 6;
GregorianCalendar calendarExpected = new GregorianCalendar(2018, 5, 30);
calendarExpected.add(Calendar.DATE, 1);
System.out.println(calendarExpected.getTime());
assertEquals(calendarExpected.get(Calendar.DATE), finalDay1);
assertEquals(calendarExpected.get(Calendar.MONTH), finalMonthJul);
}
@Test
public void test_whenSubtractOneDay_thenMonthIsChanged() {
final int finalDay31 = 31;
final int finalMonthMay = 4;
GregorianCalendar calendarExpected = new GregorianCalendar(2018, 5, 1);
calendarExpected.add(Calendar.DATE, -1);
assertEquals(calendarExpected.get(Calendar.DATE), finalDay31);
assertEquals(calendarExpected.get(Calendar.MONTH), finalMonthMay);
}
@Test
public void test_subDays() {
GregorianCalendarExample calendarDemo = new GregorianCalendarExample();
GregorianCalendar calendarActual = new GregorianCalendar(2018, 6, 28);
GregorianCalendar calendarExpected = new GregorianCalendar(2018, 6, 28);
calendarExpected.add(Calendar.DATE, -1);
Date expectedDate = calendarExpected.getTime();
assertEquals(expectedDate, calendarDemo.subtractDays(calendarActual, 1));
}
@Test
public void test_rollAdd() {
GregorianCalendarExample calendarDemo = new GregorianCalendarExample();
GregorianCalendar calendarActual = new GregorianCalendar(2018, 6, 28);
GregorianCalendar calendarExpected = new GregorianCalendar(2018, 6, 28);
calendarExpected.roll(Calendar.MONTH, 8);
Date expectedDate = calendarExpected.getTime();
assertEquals(expectedDate, calendarDemo.rollAdd(calendarActual, 8));
}
@Test
public void test_whenRollUpOneMonth_thenYearIsUnchanged() {
final int rolledUpMonthJuly = 7, orginalYear2018 = 2018;
GregorianCalendar calendarExpected = new GregorianCalendar(2018, 6, 28);
calendarExpected.roll(Calendar.MONTH, 1);
assertEquals(calendarExpected.get(Calendar.MONTH), rolledUpMonthJuly);
assertEquals(calendarExpected.get(Calendar.YEAR), orginalYear2018);
}
@Test
public void test_whenRollDownOneMonth_thenYearIsUnchanged() {
final int rolledDownMonthJune = 5, orginalYear2018 = 2018;
GregorianCalendar calendarExpected = new GregorianCalendar(2018, 6, 28);
calendarExpected.roll(Calendar.MONTH, -1);
assertEquals(calendarExpected.get(Calendar.MONTH), rolledDownMonthJune);
assertEquals(calendarExpected.get(Calendar.YEAR), orginalYear2018);
}
@Test
public void test_rollSubtract() {
GregorianCalendarExample calendarDemo = new GregorianCalendarExample();
GregorianCalendar calendarActual = new GregorianCalendar(2018, 6, 28);
GregorianCalendar calendarExpected = new GregorianCalendar(2018, 6, 28);
calendarExpected.roll(Calendar.MONTH, -8);
Date expectedDate = calendarExpected.getTime();
assertEquals(expectedDate, calendarDemo.rollAdd(calendarActual, -8));
}
@Test
public void test_setMonth() {
GregorianCalendarExample calendarDemo = new GregorianCalendarExample();
GregorianCalendar calendarActual = new GregorianCalendar(2018, 6, 28);
GregorianCalendar calendarExpected = new GregorianCalendar(2018, 6, 28);
calendarExpected.set(Calendar.MONTH, 3);
Date expectedDate = calendarExpected.getTime();
assertEquals(expectedDate, calendarDemo.setMonth(calendarActual, 3));
}
@Test
public void test_setMonthApril() {
final int setMonthApril = 3, orginalYear2018 = 2018, originalDate28 = 28;
GregorianCalendar calendarExpected = new GregorianCalendar(2018, 6, 28);
calendarExpected.set(Calendar.MONTH, 3);
assertEquals(calendarExpected.get(Calendar.MONTH), setMonthApril);
assertEquals(calendarExpected.get(Calendar.YEAR), orginalYear2018);
assertEquals(calendarExpected.get(Calendar.DATE), originalDate28);
}
@Test
public void test_toXMLGregorianCalendar() throws DatatypeConfigurationException {
GregorianCalendarExample calendarDemo = new GregorianCalendarExample();
DatatypeFactory datatypeFactory = DatatypeFactory.newInstance();
GregorianCalendar calendarActual = new GregorianCalendar(2018, 6, 28);
GregorianCalendar calendarExpected = new GregorianCalendar(2018, 6, 28);
XMLGregorianCalendar expectedXMLGregorianCalendar = datatypeFactory
.newXMLGregorianCalendar(calendarExpected);
assertEquals(expectedXMLGregorianCalendar,
calendarDemo.toXMLGregorianCalendar(calendarActual));
}
@Test
public void test_isLeapYear_True() {
GregorianCalendarExample calendarDemo = new GregorianCalendarExample();
assertEquals(true, calendarDemo.isLeapYearExample(2016));
}
@Test
public void test_isLeapYear_False() {
GregorianCalendarExample calendarDemo = new GregorianCalendarExample();
assertEquals(false, calendarDemo.isLeapYearExample(2018));
}
@Test
public void test_toDate() throws DatatypeConfigurationException {
GregorianCalendar calendarActual = new GregorianCalendar(2018, 6, 28);
DatatypeFactory datatypeFactory = DatatypeFactory.newInstance();
XMLGregorianCalendar expectedXMLGregorianCalendar = datatypeFactory
.newXMLGregorianCalendar(calendarActual);
expectedXMLGregorianCalendar.toGregorianCalendar().getTime();
assertEquals(calendarActual.getTime(),
expectedXMLGregorianCalendar.toGregorianCalendar().getTime() );
}
}

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package com.baeldung.thread.join;
import static org.junit.Assert.assertFalse;
import static org.junit.Assert.assertTrue;
import java.util.logging.Logger;
import org.junit.Ignore;
import org.junit.Test;
/**
* Demonstrates Thread.join behavior.
*
*/
public class ThreadJoinUnitTest {
final static Logger LOGGER = Logger.getLogger(ThreadJoinUnitTest.class.getName());
class SampleThread extends Thread {
public int processingCount = 0;
SampleThread(int processingCount) {
this.processingCount = processingCount;
LOGGER.info("Thread " + this.getName() + " created");
}
@Override
public void run() {
LOGGER.info("Thread " + this.getName() + " started");
while (processingCount > 0) {
try {
Thread.sleep(1000); // Simulate some work being done by thread
} catch (InterruptedException e) {
LOGGER.info("Thread " + this.getName() + " interrupted.");
}
processingCount--;
LOGGER.info("Inside Thread " + this.getName() + ", processingCount = " + processingCount);
}
LOGGER.info("Thread " + this.getName() + " exiting");
}
}
@Test
public void givenNewThread_whenJoinCalled_returnsImmediately() throws InterruptedException {
Thread t1 = new SampleThread(0);
LOGGER.info("Invoking join.");
t1.join();
LOGGER.info("Returned from join");
LOGGER.info("Thread state is" + t1.getState());
assertFalse(t1.isAlive());
}
@Test
public void givenStartedThread_whenJoinCalled_waitsTillCompletion()
throws InterruptedException {
Thread t2 = new SampleThread(1);
t2.start();
LOGGER.info("Invoking join.");
t2.join();
LOGGER.info("Returned from join");
assertFalse(t2.isAlive());
}
@Test
public void givenStartedThread_whenTimedJoinCalled_waitsUntilTimedout()
throws InterruptedException {
Thread t3 = new SampleThread(10);
t3.start();
t3.join(1000);
assertTrue(t3.isAlive());
}
@Test
@Ignore
public void givenThreadTerminated_checkForEffect_notGuaranteed()
throws InterruptedException {
SampleThread t4 = new SampleThread(10);
t4.start();
//not guaranteed to stop even if t4 finishes.
do {
} while (t4.processingCount > 0);
}
@Test
public void givenJoinWithTerminatedThread_checkForEffect_guaranteed()
throws InterruptedException {
SampleThread t4 = new SampleThread(10);
t4.start();
do {
t4.join(100);
} while (t4.processingCount > 0);
}
}

View File

@ -1 +1,14 @@
/bin/
#ignore gradle
.gradle/
#ignore build and generated files
build/
node/
out/
#ignore installed node modules and package lock file
node_modules/
package-lock.json

View File

@ -30,3 +30,6 @@
- [Lambda Expressions in Kotlin](http://www.baeldung.com/kotlin-lambda-expressions)
- [Writing Specifications with Kotlin and Spek](http://www.baeldung.com/kotlin-spek)
- [Processing JSON with Kotlin and Klaxson](http://www.baeldung.com/kotlin-json-klaxson)
- [Kotlin String Templates](http://www.baeldung.com/kotlin-string-template)
- [Java EE 8 Security API](http://www.baeldung.com/java-ee-8-security)
- [Kotlin with Ktor](http://www.baeldung.com/kotlin-ktor)

57
core-kotlin/build.gradle Executable file
View File

@ -0,0 +1,57 @@
group 'com.baeldung.ktor'
version '1.0-SNAPSHOT'
buildscript {
ext.kotlin_version = '1.2.41'
ext.ktor_version = '0.9.2'
repositories {
mavenCentral()
}
dependencies {
classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
}
}
apply plugin: 'java'
apply plugin: 'kotlin'
apply plugin: 'application'
mainClassName = 'APIServer.kt'
sourceCompatibility = 1.8
compileKotlin { kotlinOptions.jvmTarget = "1.8" }
compileTestKotlin { kotlinOptions.jvmTarget = "1.8" }
kotlin { experimental { coroutines "enable" } }
repositories {
mavenCentral()
jcenter()
maven { url "https://dl.bintray.com/kotlin/ktor" }
}
sourceSets {
main{
kotlin{
srcDirs 'com/baeldung/ktor'
}
}
}
dependencies {
compile "io.ktor:ktor-server-netty:$ktor_version"
compile "ch.qos.logback:logback-classic:1.2.1"
compile "io.ktor:ktor-gson:$ktor_version"
testCompile group: 'junit', name: 'junit', version: '4.12'
implementation 'com.beust:klaxon:3.0.1'
}
task runServer(type: JavaExec) {
main = 'APIServer'
classpath = sourceSets.main.runtimeClasspath
}

View File

@ -5,7 +5,7 @@ version '1.0-SNAPSHOT'
buildscript {
ext.kotlin_version = '1.2.40'
ext.kotlin_version = '1.2.41'
ext.ktor_version = '0.9.2'
repositories {

Binary file not shown.

View File

@ -0,0 +1,5 @@
distributionBase=GRADLE_USER_HOME
distributionPath=wrapper/dists
zipStoreBase=GRADLE_USER_HOME
zipStorePath=wrapper/dists
distributionUrl=https\://services.gradle.org/distributions/gradle-4.4-bin.zip

172
core-kotlin/kotlin-ktor/gradlew vendored Executable file
View File

@ -0,0 +1,172 @@
#!/usr/bin/env sh
##############################################################################
##
## Gradle start up script for UN*X
##
##############################################################################
# Attempt to set APP_HOME
# Resolve links: $0 may be a link
PRG="$0"
# Need this for relative symlinks.
while [ -h "$PRG" ] ; do
ls=`ls -ld "$PRG"`
link=`expr "$ls" : '.*-> \(.*\)$'`
if expr "$link" : '/.*' > /dev/null; then
PRG="$link"
else
PRG=`dirname "$PRG"`"/$link"
fi
done
SAVED="`pwd`"
cd "`dirname \"$PRG\"`/" >/dev/null
APP_HOME="`pwd -P`"
cd "$SAVED" >/dev/null
APP_NAME="Gradle"
APP_BASE_NAME=`basename "$0"`
# Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
DEFAULT_JVM_OPTS=""
# Use the maximum available, or set MAX_FD != -1 to use that value.
MAX_FD="maximum"
warn () {
echo "$*"
}
die () {
echo
echo "$*"
echo
exit 1
}
# OS specific support (must be 'true' or 'false').
cygwin=false
msys=false
darwin=false
nonstop=false
case "`uname`" in
CYGWIN* )
cygwin=true
;;
Darwin* )
darwin=true
;;
MINGW* )
msys=true
;;
NONSTOP* )
nonstop=true
;;
esac
CLASSPATH=$APP_HOME/gradle/wrapper/gradle-wrapper.jar
# Determine the Java command to use to start the JVM.
if [ -n "$JAVA_HOME" ] ; then
if [ -x "$JAVA_HOME/jre/sh/java" ] ; then
# IBM's JDK on AIX uses strange locations for the executables
JAVACMD="$JAVA_HOME/jre/sh/java"
else
JAVACMD="$JAVA_HOME/bin/java"
fi
if [ ! -x "$JAVACMD" ] ; then
die "ERROR: JAVA_HOME is set to an invalid directory: $JAVA_HOME
Please set the JAVA_HOME variable in your environment to match the
location of your Java installation."
fi
else
JAVACMD="java"
which java >/dev/null 2>&1 || die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
Please set the JAVA_HOME variable in your environment to match the
location of your Java installation."
fi
# Increase the maximum file descriptors if we can.
if [ "$cygwin" = "false" -a "$darwin" = "false" -a "$nonstop" = "false" ] ; then
MAX_FD_LIMIT=`ulimit -H -n`
if [ $? -eq 0 ] ; then
if [ "$MAX_FD" = "maximum" -o "$MAX_FD" = "max" ] ; then
MAX_FD="$MAX_FD_LIMIT"
fi
ulimit -n $MAX_FD
if [ $? -ne 0 ] ; then
warn "Could not set maximum file descriptor limit: $MAX_FD"
fi
else
warn "Could not query maximum file descriptor limit: $MAX_FD_LIMIT"
fi
fi
# For Darwin, add options to specify how the application appears in the dock
if $darwin; then
GRADLE_OPTS="$GRADLE_OPTS \"-Xdock:name=$APP_NAME\" \"-Xdock:icon=$APP_HOME/media/gradle.icns\""
fi
# For Cygwin, switch paths to Windows format before running java
if $cygwin ; then
APP_HOME=`cygpath --path --mixed "$APP_HOME"`
CLASSPATH=`cygpath --path --mixed "$CLASSPATH"`
JAVACMD=`cygpath --unix "$JAVACMD"`
# We build the pattern for arguments to be converted via cygpath
ROOTDIRSRAW=`find -L / -maxdepth 1 -mindepth 1 -type d 2>/dev/null`
SEP=""
for dir in $ROOTDIRSRAW ; do
ROOTDIRS="$ROOTDIRS$SEP$dir"
SEP="|"
done
OURCYGPATTERN="(^($ROOTDIRS))"
# Add a user-defined pattern to the cygpath arguments
if [ "$GRADLE_CYGPATTERN" != "" ] ; then
OURCYGPATTERN="$OURCYGPATTERN|($GRADLE_CYGPATTERN)"
fi
# Now convert the arguments - kludge to limit ourselves to /bin/sh
i=0
for arg in "$@" ; do
CHECK=`echo "$arg"|egrep -c "$OURCYGPATTERN" -`
CHECK2=`echo "$arg"|egrep -c "^-"` ### Determine if an option
if [ $CHECK -ne 0 ] && [ $CHECK2 -eq 0 ] ; then ### Added a condition
eval `echo args$i`=`cygpath --path --ignore --mixed "$arg"`
else
eval `echo args$i`="\"$arg\""
fi
i=$((i+1))
done
case $i in
(0) set -- ;;
(1) set -- "$args0" ;;
(2) set -- "$args0" "$args1" ;;
(3) set -- "$args0" "$args1" "$args2" ;;
(4) set -- "$args0" "$args1" "$args2" "$args3" ;;
(5) set -- "$args0" "$args1" "$args2" "$args3" "$args4" ;;
(6) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" ;;
(7) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" ;;
(8) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" ;;
(9) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" "$args8" ;;
esac
fi
# Escape application args
save () {
for i do printf %s\\n "$i" | sed "s/'/'\\\\''/g;1s/^/'/;\$s/\$/' \\\\/" ; done
echo " "
}
APP_ARGS=$(save "$@")
# Collect all arguments for the java command, following the shell quoting and substitution rules
eval set -- $DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS "\"-Dorg.gradle.appname=$APP_BASE_NAME\"" -classpath "\"$CLASSPATH\"" org.gradle.wrapper.GradleWrapperMain "$APP_ARGS"
# by default we should be in the correct project dir, but when run from Finder on Mac, the cwd is wrong
if [ "$(uname)" = "Darwin" ] && [ "$HOME" = "$PWD" ]; then
cd "$(dirname "$0")"
fi
exec "$JAVACMD" "$@"

84
core-kotlin/kotlin-ktor/gradlew.bat vendored Executable file
View File

@ -0,0 +1,84 @@
@if "%DEBUG%" == "" @echo off
@rem ##########################################################################
@rem
@rem Gradle startup script for Windows
@rem
@rem ##########################################################################
@rem Set local scope for the variables with windows NT shell
if "%OS%"=="Windows_NT" setlocal
set DIRNAME=%~dp0
if "%DIRNAME%" == "" set DIRNAME=.
set APP_BASE_NAME=%~n0
set APP_HOME=%DIRNAME%
@rem Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
set DEFAULT_JVM_OPTS=
@rem Find java.exe
if defined JAVA_HOME goto findJavaFromJavaHome
set JAVA_EXE=java.exe
%JAVA_EXE% -version >NUL 2>&1
if "%ERRORLEVEL%" == "0" goto init
echo.
echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
echo.
echo Please set the JAVA_HOME variable in your environment to match the
echo location of your Java installation.
goto fail
:findJavaFromJavaHome
set JAVA_HOME=%JAVA_HOME:"=%
set JAVA_EXE=%JAVA_HOME%/bin/java.exe
if exist "%JAVA_EXE%" goto init
echo.
echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME%
echo.
echo Please set the JAVA_HOME variable in your environment to match the
echo location of your Java installation.
goto fail
:init
@rem Get command-line arguments, handling Windows variants
if not "%OS%" == "Windows_NT" goto win9xME_args
:win9xME_args
@rem Slurp the command line arguments.
set CMD_LINE_ARGS=
set _SKIP=2
:win9xME_args_slurp
if "x%~1" == "x" goto execute
set CMD_LINE_ARGS=%*
:execute
@rem Setup the command line
set CLASSPATH=%APP_HOME%\gradle\wrapper\gradle-wrapper.jar
@rem Execute Gradle
"%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -classpath "%CLASSPATH%" org.gradle.wrapper.GradleWrapperMain %CMD_LINE_ARGS%
:end
@rem End local scope for the variables with windows NT shell
if "%ERRORLEVEL%"=="0" goto mainEnd
:fail
rem Set variable GRADLE_EXIT_CONSOLE if you need the _script_ return code instead of
rem the _cmd.exe /c_ return code!
if not "" == "%GRADLE_EXIT_CONSOLE%" exit 1
exit /b 1
:mainEnd
if "%OS%"=="Windows_NT" endlocal
:omega

View File

@ -1,26 +1,26 @@
@file:JvmName("APIServer")
import io.ktor.application.call
import io.ktor.application.install
import io.ktor.features.CallLogging
import io.ktor.features.ContentNegotiation
import io.ktor.features.DefaultHeaders
import io.ktor.gson.gson
import io.ktor.http.ContentType
import io.ktor.request.path
import io.ktor.request.receive
import io.ktor.response.respond
import io.ktor.response.respondText
import io.ktor.routing.get
import io.ktor.routing.routing
import io.ktor.routing.*
import io.ktor.server.engine.embeddedServer
import io.ktor.server.netty.Netty
import org.slf4j.event.Level
data class Author(val name: String, val website: String)
data class ToDo(var id: Int, val name: String, val description: String, val completed: Boolean)
fun main(args: Array<String>) {
val toDoList = ArrayList<ToDo>();
val jsonResponse = """{
"id": 1,
"task": "Pay waterbill",
@ -33,7 +33,7 @@ fun main(args: Array<String>) {
header("X-Developer", "Baeldung")
}
install(CallLogging) {
level = Level.INFO
level = Level.DEBUG
filter { call -> call.request.path().startsWith("/todo") }
filter { call -> call.request.path().startsWith("/author") }
}
@ -42,15 +42,31 @@ fun main(args: Array<String>) {
setPrettyPrinting()
}
}
routing {
get("/todo") {
call.respondText(jsonResponse, ContentType.Application.Json)
}
get("/author") {
val author = Author("baeldung", "baeldung.com")
call.respond(author)
routing() {
route("/todo") {
post {
var toDo = call.receive<ToDo>();
toDo.id = toDoList.size;
toDoList.add(toDo);
call.respond("Added")
}
delete("/{id}") {
call.respond(toDoList.removeAt(call.parameters["id"]!!.toInt()));
}
get("/{id}") {
call.respond(toDoList[call.parameters["id"]!!.toInt()]);
}
get {
call.respond(toDoList);
}
}
get("/author"){
call.respond(Author("Baeldung","baeldung.com"));
}
}
}.start(wait = true)

View File

@ -0,0 +1,11 @@
<configuration>
<appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
<encoder>
<pattern>%d{YYYY-MM-dd HH:mm:ss.SSS} [%thread] %-5level %logger{36} - %msg%n</pattern>
</encoder>
</appender>
<root level="INFO">
<appender-ref ref="STDOUT"/>
</root>
</configuration>

2
core-kotlin/settings.gradle Executable file
View File

@ -0,0 +1,2 @@
rootProject.name = 'KtorWithKotlin'

View File

@ -0,0 +1,73 @@
@file:JvmName("APIServer")
import io.ktor.application.call
import io.ktor.application.install
import io.ktor.features.CallLogging
import io.ktor.features.ContentNegotiation
import io.ktor.features.DefaultHeaders
import io.ktor.gson.gson
import io.ktor.request.path
import io.ktor.request.receive
import io.ktor.response.respond
import io.ktor.routing.*
import io.ktor.server.engine.embeddedServer
import io.ktor.server.netty.Netty
import org.slf4j.event.Level
data class Author(val name: String, val website: String)
data class ToDo(var id: Int, val name: String, val description: String, val completed: Boolean)
fun main(args: Array<String>) {
val toDoList = ArrayList<ToDo>();
val jsonResponse = """{
"id": 1,
"task": "Pay waterbill",
"description": "Pay water bill today",
}"""
embeddedServer(Netty, 8080) {
install(DefaultHeaders) {
header("X-Developer", "Baeldung")
}
install(CallLogging) {
level = Level.DEBUG
filter { call -> call.request.path().startsWith("/todo") }
filter { call -> call.request.path().startsWith("/author") }
}
install(ContentNegotiation) {
gson {
setPrettyPrinting()
}
}
routing() {
route("/todo") {
post {
var toDo = call.receive<ToDo>();
toDo.id = toDoList.size;
toDoList.add(toDo);
call.respond("Added")
}
delete("/{id}") {
call.respond(toDoList.removeAt(call.parameters["id"]!!.toInt()));
}
get("/{id}") {
call.respond(toDoList[call.parameters["id"]!!.toInt()]);
}
get {
call.respond(toDoList);
}
}
get("/author"){
call.respond(Author("Baeldung","baeldung.com"));
}
}
}.start(wait = true)
}

View File

@ -1,13 +1,13 @@
package com.baeldung.trie;
public class Trie {
class Trie {
private TrieNode root;
Trie() {
root = new TrieNode();
}
public void insert(String word) {
void insert(String word) {
TrieNode current = root;
for (int i = 0; i < word.length(); i++) {
@ -16,11 +16,11 @@ public class Trie {
current.setEndOfWord(true);
}
public boolean delete(String word) {
boolean delete(String word) {
return delete(root, word, 0);
}
public boolean containsNode(String word) {
boolean containsNode(String word) {
TrieNode current = root;
for (int i = 0; i < word.length(); i++) {
@ -34,7 +34,7 @@ public class Trie {
return current.isEndOfWord();
}
public boolean isEmpty() {
boolean isEmpty() {
return root == null;
}
@ -51,7 +51,7 @@ public class Trie {
if (node == null) {
return false;
}
boolean shouldDeleteCurrentNode = delete(node, word, index + 1);
boolean shouldDeleteCurrentNode = delete(node, word, index + 1) && !node.isEndOfWord();
if (shouldDeleteCurrentNode) {
current.getChildren().remove(ch);

View File

@ -4,28 +4,18 @@ import java.util.HashMap;
import java.util.Map;
class TrieNode {
private Map<Character, TrieNode> children;
private final Map<Character, TrieNode> children = new HashMap<>();
private boolean endOfWord;
public TrieNode() {
children = new HashMap<>();
endOfWord = false;
}
public Map<Character, TrieNode> getChildren() {
Map<Character, TrieNode> getChildren() {
return children;
}
public void setChildren(Map<Character, TrieNode> children) {
this.children = children;
}
public boolean isEndOfWord() {
boolean isEndOfWord() {
return endOfWord;
}
public void setEndOfWord(boolean endOfWord) {
void setEndOfWord(boolean endOfWord) {
this.endOfWord = endOfWord;
}
}

View File

@ -1,6 +1,7 @@
package com.baeldung.trie;
import org.junit.Test;
import org.junit.jupiter.api.Assertions;
import static org.junit.Assert.assertFalse;
import static org.junit.Assert.assertTrue;
@ -53,6 +54,19 @@ public class TrieTest {
assertFalse(trie.containsNode("Programming"));
}
@Test
public void givenATrie_whenDeletingOverlappingElements_thenDontDeleteSubElement() {
Trie trie1 = new Trie();
trie1.insert("pie");
trie1.insert("pies");
trie1.delete("pies");
Assertions.assertTrue(trie1.containsNode("pie"));
}
private Trie createExampleTrie() {
Trie trie = new Trie();

View File

@ -1 +1,3 @@
## Relevant articles:
- [A Guide to DeltaSpike Data Module](http://www.baeldung.com/deltaspike-data-module)

View File

@ -0,0 +1,21 @@
<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>widlfly-mdb</artifactId>
<parent>
<groupId>com.baeldung.wildfly</groupId>
<artifactId>wildfly-example</artifactId>
<version>0.0.1-SNAPSHOT</version>
</parent>
<dependencies>
<!-- Dependency for java ee -->
<dependency>
<groupId>javax</groupId>
<artifactId>javaee-api</artifactId>
<version>${javaee-api.version}</version>
<scope>provided</scope>
</dependency>
</dependencies>
</project>

View File

@ -0,0 +1,28 @@
package com.baeldung.wildfly.mdb;
import javax.ejb.ActivationConfigProperty;
import javax.ejb.MessageDriven;
import javax.jms.JMSException;
import javax.jms.Message;
import javax.jms.MessageListener;
import javax.jms.TextMessage;
/**
* Message-Driven Bean implementation class for: ReadMessageMDB
*/
@MessageDriven(
activationConfig = {
@ActivationConfigProperty(propertyName = "destination", propertyValue = "tutorialQueue"),
@ActivationConfigProperty(propertyName = "destinationType", propertyValue = "javax.jms.Queue")
})
public class ReadMessageMDB implements MessageListener {
public void onMessage(Message message) {
TextMessage textMessage = (TextMessage) message;
try {
System.out.println("Message received: " + textMessage.getText());
} catch (JMSException e) {
System.out.println("Error while trying to consume messages: " + e.getMessage());
}
}
}

View File

@ -0,0 +1,52 @@
package baeldung.com.example.servlet;
import java.io.IOException;
import javax.jms.Connection;
import javax.jms.ConnectionFactory;
import javax.jms.JMSException;
import javax.jms.MessageProducer;
import javax.jms.Queue;
import javax.jms.Session;
import javax.jms.TextMessage;
import javax.naming.Context;
import javax.naming.InitialContext;
import javax.naming.NamingException;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
@WebServlet("/SendMessageServlet")
public class SendMessageServlet extends HttpServlet {
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse res) throws ServletException, IOException {
String text = req.getParameter("text") != null ? req.getParameter("text") : "Hello World";
try (
Context ic = new InitialContext();
ConnectionFactory cf = (ConnectionFactory) ic.lookup("/ConnectionFactory");
Queue queue = (Queue) ic.lookup("queue/tutorialQueue");
Connection connection = cf.createConnection();
) {
Session session = connection.createSession(false, Session.AUTO_ACKNOWLEDGE);
MessageProducer publisher = session.createProducer(queue);
connection.start();
TextMessage message = session.createTextMessage(text);
publisher.send(message);
} catch (NamingException | JMSException e) {
res.getWriter().println("Error while trying to send <" + text + "> message: " + e.getMessage());
}
res.getWriter().println("Message sent: " + text);
}
}

View File

@ -1,4 +1,4 @@
## EthereumJ
## Ethereum
### Relevant Articles:
- [Introduction to EthereumJ](http://www.baeldung.com/ethereumj)

229
ethereum/pom.xml Normal file
View File

@ -0,0 +1,229 @@
<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.ethereum</groupId>
<artifactId>ethereum</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>ethereum</name>
<parent>
<artifactId>parent-spring-5</artifactId>
<groupId>com.baeldung</groupId>
<version>0.0.1-SNAPSHOT</version>
<relativePath>../parent-spring-5</relativePath>
</parent>
<dependencies>
<!-- Spring Boot Dependencies -->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter</artifactId>
<version>${spring.boot.version}</version>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
<version>${spring.boot.version}</version>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-tomcat</artifactId>
<version>${spring.boot.version}</version>
</dependency>
<!-- Spring Dependencies -->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-core</artifactId>
<version>${springframework.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-web</artifactId>
<version>${springframework.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-webmvc</artifactId>
<version>${springframework.version}</version>
</dependency>
<!-- Ethereum -->
<dependency>
<groupId>org.ethereum</groupId>
<artifactId>ethereumj-core</artifactId>
<version>${ethereumj-core.version}</version>
</dependency>
<dependency>
<groupId>org.web3j</groupId>
<artifactId>core</artifactId>
<version>${web3j.core.version}</version>
</dependency>
<!-- Jackson Dependencies -->
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-core</artifactId>
<version>${jackson.version}</version>
</dependency>
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-databind</artifactId>
<version>${jackson.version}</version>
</dependency>
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-annotations</artifactId>
<version>${jackson.version}</version>
</dependency>
<!-- Servlet -->
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>jstl</artifactId>
<version>${jstl.version}</version>
</dependency>
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>javax.servlet-api</artifactId>
<version>${javax-servlet.version}</version>
</dependency>
<dependency>
<groupId>javax.servlet.jsp.jstl</groupId>
<artifactId>jstl-api</artifactId>
<version>${jstl.version}</version>
</dependency>
<dependency>
<groupId>javax.servlet.jsp</groupId>
<artifactId>javax.servlet.jsp-api</artifactId>
<version>${javax-jsp.version}</version>
</dependency>
<!-- Logging -->
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>jcl-over-slf4j</artifactId>
<version>${slf4j.version}</version>
</dependency>
<dependency>
<groupId>ch.qos.logback</groupId>
<artifactId>logback-classic</artifactId>
<version>${logback.version}</version>
</dependency>
<!-- Spring Testing -->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
<version>${spring.boot.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-context</artifactId>
<version>${springframework.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-test</artifactId>
<version>${springframework.version}</version>
<scope>test</scope>
</dependency>
<!-- Testing -->
<dependency>
<groupId>org.mockito</groupId>
<artifactId>mockito-core</artifactId>
<version>${mockito.version}</version>
<exclusions>
<exclusion>
<groupId>org.hamcrest</groupId>
<artifactId>hamcrest-core</artifactId>
</exclusion>
</exclusions>
<scope>test</scope>
</dependency>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>${junit.version}</version>
<scope>test</scope>
<exclusions>
<exclusion>
<groupId>org.hamcrest</groupId>
<artifactId>hamcrest-core</artifactId>
</exclusion>
</exclusions>
</dependency>
<dependency>
<groupId>org.hamcrest</groupId>
<artifactId>hamcrest-library</artifactId>
<version>${hamcrest.version}</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>com.jayway.jsonpath</groupId>
<artifactId>json-path</artifactId>
<version>${jsonpath.version}</version>
</dependency>
</dependencies>
<build>
<finalName>ethereum</finalName>
<plugins>
<plugin>
<artifactId>maven-compiler-plugin</artifactId>
<version>3.1</version>
<configuration>
<source>1.8</source>
<target>1.8</target>
</configuration>
</plugin>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-war-plugin</artifactId>
<version>3.0.0</version>
<configuration>
<warSourceDirectory>src/main/webapp</warSourceDirectory>
<failOnMissingWebXml>false</failOnMissingWebXml>
</configuration>
</plugin>
</plugins>
</build>
<repositories>
<repository>
<id>Ethereum</id>
<name>Ethereum</name>
<url>https://dl.bintray.com/ethereum/maven/</url>
</repository>
</repositories>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<java.version>1.8</java.version>
<tomcat.version>8.5.4</tomcat.version>
<ethereumj-core.version>1.5.0-RELEASE</ethereumj-core.version>
<web3j.core.version>3.3.1</web3j.core.version>
<springframework.version>5.0.5.RELEASE</springframework.version>
<spring.boot.version>1.5.6.RELEASE</spring.boot.version>
<mockito.version>1.10.19</mockito.version>
<jackson-databind.version>2.5.0</jackson-databind.version>
<hamcrest.version>1.3</hamcrest.version>
<jackson.version>2.9.3</jackson.version>
<javax-jsp.version>2.3.1</javax-jsp.version>
<javax-servlet.version>3.1.0</javax-servlet.version>
<jsonpath.version>2.4.0</jsonpath.version>
<jstl.version>1.2</jstl.version>
<junit.version>4.12</junit.version>
<logback.version>1.2.3</logback.version>
<slf4j.version>1.7.25</slf4j.version>
</properties>
</project>

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@ -0,0 +1,68 @@
package com.baeldung.web3j.config;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;
import org.springframework.scheduling.annotation.EnableAsync;
import org.springframework.scheduling.concurrent.ThreadPoolTaskExecutor;
import org.springframework.web.servlet.config.annotation.EnableWebMvc;
import org.springframework.web.servlet.config.annotation.ResourceHandlerRegistry;
import org.springframework.web.servlet.config.annotation.ViewControllerRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;
import org.springframework.web.servlet.resource.PathResourceResolver;
import org.springframework.web.servlet.view.JstlView;
import org.springframework.web.servlet.view.UrlBasedViewResolver;
import java.util.concurrent.Executor;
@Configuration
@EnableWebMvc
@EnableAsync
@ComponentScan("com.baeldung.web3j")
public class AppConfig implements WebMvcConfigurer {
public void addViewControllers(ViewControllerRegistry registry) {
registry.addViewController("/").setViewName("index");
}
/**
* Static resource locations including themes
*/
@Override
public void addResourceHandlers(ResourceHandlerRegistry registry) {
registry.addResourceHandler("/resources/**/*")
.addResourceLocations("/", "/resources/")
.setCachePeriod(3600)
.resourceChain(true)
.addResolver(new PathResourceResolver());
}
/**
* View resolver for JSP
*/
@Bean
public UrlBasedViewResolver viewResolver() {
UrlBasedViewResolver resolver = new UrlBasedViewResolver();
resolver.setPrefix("/WEB-INF/jsp/");
resolver.setSuffix(".jsp");
resolver.setViewClass(JstlView.class);
return resolver;
}
/**
* Configuration for async thread bean
*
* More: https://docs.spring.io/autorepo/docs/spring-framework/5.0.3.RELEASE/javadoc-api/org/springframework/scheduling/SchedulingTaskExecutor.html
*/
@Bean
public Executor asyncExecutor() {
ThreadPoolTaskExecutor executor = new ThreadPoolTaskExecutor();
executor.setCorePoolSize(2);
executor.setMaxPoolSize(2);
executor.setQueueCapacity(500);
executor.setThreadNamePrefix("CsvThread");
executor.initialize();
return executor;
}
}

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@ -0,0 +1,28 @@
package com.baeldung.web3j.config;
import org.springframework.web.servlet.support.AbstractAnnotationConfigDispatcherServletInitializer;
public class WebAppInitializer extends AbstractAnnotationConfigDispatcherServletInitializer {
//AbstractDispatcherServletInitializer override DEFAULT_SERVLET_NAME
@Override
protected String getServletName() {
return "dispatcher";
}
@Override
protected Class<?>[] getRootConfigClasses() {
return new Class[]{};
}
@Override
protected Class<?>[] getServletConfigClasses() {
return new Class[]{AppConfig.class};
}
@Override
protected String[] getServletMappings() {
return new String[]{"/"};
}
}

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