Merge remote-tracking branch 'upstream/master'

This commit is contained in:
Philippe 2019-05-21 01:08:09 -03:00
commit b3e70acc05
219 changed files with 10036 additions and 511 deletions

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@ -4,4 +4,3 @@
- [Implementing Simple State Machines with Java Enums](https://www.baeldung.com/java-enum-simple-state-machine)
- [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)
- [An Introduction to the Theory of Big-O Notation](http://www.baeldung.com/big-o-notation)

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@ -0,0 +1,5 @@
Dear <% out << (user) %>,
Please read the requested article below.
<% out << (articleText) %>
From,
<% out << (signature) %>

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@ -0,0 +1,3 @@
Dear $user,
Thanks for subscribing our services.
${signature}

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@ -0,0 +1,96 @@
package com.baeldung.templateengine
import groovy.text.SimpleTemplateEngine
import groovy.text.StreamingTemplateEngine
import groovy.text.GStringTemplateEngine
import groovy.text.XmlTemplateEngine
import groovy.text.XmlTemplateEngine
import groovy.text.markup.MarkupTemplateEngine
import groovy.text.markup.TemplateConfiguration
class TemplateEnginesUnitTest extends GroovyTestCase {
def bindMap = [user: "Norman", signature: "Baeldung"]
void testSimpleTemplateEngine() {
def smsTemplate = 'Dear <% print user %>, Thanks for reading our Article. ${signature}'
def smsText = new SimpleTemplateEngine().createTemplate(smsTemplate).make(bindMap)
assert smsText.toString() == "Dear Norman, Thanks for reading our Article. Baeldung"
}
void testStreamingTemplateEngine() {
def articleEmailTemplate = new File('src/main/resources/articleEmail.template')
bindMap.articleText = """1. Overview
This is a tutorial article on Template Engines""" //can be a string larger than 64k
def articleEmailText = new StreamingTemplateEngine().createTemplate(articleEmailTemplate).make(bindMap)
assert articleEmailText.toString() == """Dear Norman,
Please read the requested article below.
1. Overview
This is a tutorial article on Template Engines
From,
Baeldung"""
}
void testGStringTemplateEngine() {
def emailTemplate = new File('src/main/resources/email.template')
def emailText = new GStringTemplateEngine().createTemplate(emailTemplate).make(bindMap)
assert emailText.toString() == "Dear Norman,\nThanks for subscribing our services.\nBaeldung"
}
void testXmlTemplateEngine() {
def emailXmlTemplate = '''<xs xmlns:gsp='groovy-server-pages'>
<gsp:scriptlet>def emailContent = "Thanks for subscribing our services."</gsp:scriptlet>
<email>
<greet>Dear ${user}</greet>
<content><gsp:expression>emailContent</gsp:expression></content>
<signature>${signature}</signature>
</email>
</xs>'''
def emailXml = new XmlTemplateEngine().createTemplate(emailXmlTemplate).make(bindMap)
println emailXml.toString()
}
void testMarkupTemplateEngineHtml() {
def emailHtmlTemplate = """html {
head {
title('Service Subscription Email')
}
body {
p('Dear Norman')
p('Thanks for subscribing our services.')
p('Baeldung')
}
}"""
def emailHtml = new MarkupTemplateEngine().createTemplate(emailHtmlTemplate).make()
println emailHtml.toString()
}
void testMarkupTemplateEngineXml() {
def emailXmlTemplate = """xmlDeclaration()
xs{
email {
greet('Dear Norman')
content('Thanks for subscribing our services.')
signature('Baeldung')
}
}
"""
TemplateConfiguration config = new TemplateConfiguration()
config.autoIndent = true
config.autoEscape = true
config.autoNewLine = true
def emailXml = new MarkupTemplateEngine(config).createTemplate(emailXmlTemplate).make()
println emailXml.toString()
}
}

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@ -0,0 +1,3 @@
## Relevant Articles
- [Extending an Arrays Length](https://www.baeldung.com/java-array-add-element-at-the-end)

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@ -1,5 +1,7 @@
<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">
<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>core-java-11</artifactId>
@ -12,7 +14,7 @@
<groupId>com.baeldung</groupId>
<artifactId>parent-modules</artifactId>
<version>1.0.0-SNAPSHOT</version>
<relativePath>../../</relativePath>
<relativePath>../..</relativePath>
</parent>
<dependencies>
@ -21,6 +23,12 @@
<artifactId>guava</artifactId>
<version>${guava.version}</version>
</dependency>
<dependency>
<groupId>org.assertj</groupId>
<artifactId>assertj-core</artifactId>
<version>${assertj.version}</version>
<scope>test</scope>
</dependency>
</dependencies>
<build>
@ -41,6 +49,7 @@
<maven.compiler.source.version>11</maven.compiler.source.version>
<maven.compiler.target.version>11</maven.compiler.target.version>
<guava.version>27.1-jre</guava.version>
<assertj.version>3.11.1</assertj.version>
</properties>
</project>

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@ -0,0 +1,19 @@
package com.baeldung.predicate.not;
public class Person {
private static final int ADULT_AGE = 18;
private int age;
public Person(int age) {
this.age = age;
}
public boolean isAdult() {
return age >= ADULT_AGE;
}
public boolean isNotAdult() {
return !isAdult();
}
}

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@ -7,7 +7,7 @@ import junit.framework.TestSuite;
/**
* Unit test for simple App.
*/
public class AppTest
public class AppUnitTest
extends TestCase
{
/**
@ -15,7 +15,7 @@ public class AppTest
*
* @param testName name of the test case
*/
public AppTest( String testName )
public AppUnitTest(String testName )
{
super( testName );
}
@ -25,7 +25,7 @@ public class AppTest
*/
public static Test suite()
{
return new TestSuite( AppTest.class );
return new TestSuite( AppUnitTest.class );
}
/**

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@ -32,7 +32,7 @@ import java.util.stream.Collectors;
import org.junit.jupiter.api.Test;
public class HttpClientTest {
public class HttpClientUnitTest {
@Test
public void shouldReturnSampleDataContentWhenConnectViaSystemProxy() throws IOException, InterruptedException, URISyntaxException {

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@ -19,7 +19,7 @@ import java.time.Duration;
import org.junit.Test;
public class HttpRequestTest {
public class HttpRequestUnitTest {
@Test
public void shouldReturnStatusOKWhenSendGetRequest() throws IOException, InterruptedException, URISyntaxException {

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@ -14,7 +14,7 @@ import java.net.http.HttpResponse;
import org.junit.Test;
public class HttpResponseTest {
public class HttpResponseUnitTest {
@Test
public void shouldReturnStatusOKWhenSendGetRequest() throws IOException, InterruptedException, URISyntaxException {

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@ -0,0 +1,61 @@
package com.baeldung.predicate.not;
import java.util.Arrays;
import java.util.List;
import java.util.stream.Collectors;
import static java.util.function.Predicate.not;
import org.junit.jupiter.api.BeforeEach;
import org.junit.jupiter.api.Test;
import static org.assertj.core.api.Assertions.assertThat;
class PersonUnitTest {
private List<Person> people;
@BeforeEach
void preparePeople() {
people = Arrays.asList(
new Person(1),
new Person(18),
new Person(2)
);
}
@Test
void givenPeople_whenFilterIsAdult_thenOneResult() {
List<Person> adults = people.stream()
.filter(Person::isAdult)
.collect(Collectors.toList());
assertThat(adults).size().isEqualTo(1);
}
@Test
void givenPeople_whenFilterIsAdultNegated_thenTwoResults() {
List<Person> nonAdults = people.stream()
.filter(person -> !person.isAdult())
.collect(Collectors.toList());
assertThat(nonAdults).size().isEqualTo(2);
}
@Test
void givenPeople_whenFilterIsNotAdult_thenTwoResults() {
List<Person> nonAdults = people.stream()
.filter(Person::isNotAdult)
.collect(Collectors.toList());
assertThat(nonAdults).size().isEqualTo(2);
}
@Test
void givenPeople_whenFilterNotIsAdult_thenTwoResults() {
List<Person> nonAdults = people.stream()
.filter(not(Person::isAdult))
.collect(Collectors.toList());
assertThat(nonAdults).size().isEqualTo(2);
}
}

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@ -0,0 +1,43 @@
package com.baeldung.string;
import static org.hamcrest.CoreMatchers.equalTo;
import static org.hamcrest.MatcherAssert.assertThat;
import org.junit.Test;
public class StringAPITest {
@Test
public void whenPositiveArgument_thenReturnIndentedString() {
String multilineStr = "This is\na multiline\nstring.";
String outputStr = " This is\n a multiline\n string.\n";
String postIndent = multilineStr.indent(3);
assertThat(postIndent, equalTo(outputStr));
}
@Test
public void whenNegativeArgument_thenReturnReducedIndentedString() {
String multilineStr = " This is\n a multiline\n string.";
String outputStr = " This is\n a multiline\n string.\n";
String postIndent = multilineStr.indent(-2);
assertThat(postIndent, equalTo(outputStr));
}
@Test
public void whenTransformUsingLamda_thenReturnTransformedString() {
String result = "hello".transform(input -> input + " world!");
assertThat(result, equalTo("hello world!"));
}
@Test
public void whenTransformUsingParseInt_thenReturnInt() {
int result = "42".transform(Integer::parseInt);
assertThat(result, equalTo(42));
}
}

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@ -3,4 +3,5 @@
## Core Java 8 Cookbooks and Examples (part 2)
### Relevant Articles:
- [Anonymous Classes in Java](http://www.baeldung.com/)
- [Anonymous Classes in Java](https://www.baeldung.com/java-anonymous-classes)
- [Run JAR Application With Command Line Arguments](https://www.baeldung.com/java-run-jar-with-arguments)

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@ -20,7 +20,6 @@
- [Multi-Release Jar Files](https://www.baeldung.com/java-multi-release-jar)
- [Ahead of Time Compilation (AoT)](https://www.baeldung.com/ahead-of-time-compilation)
- [Java 9 Process API Improvements](https://www.baeldung.com/java-9-process-api)
- [Guide to java.lang.Process API](https://www.baeldung.com/java-process-api)
- [Java 9 java.util.Objects Additions](https://www.baeldung.com/java-9-objects-new)
- [Java 9 Reactive Streams](https://www.baeldung.com/java-9-reactive-streams)
- [Java 9 Optional API Additions](https://www.baeldung.com/java-9-optional)
@ -31,4 +30,4 @@
- [A Guide to Java 9 Modularity](https://www.baeldung.com/java-9-modularity)
- [Java 9 Platform Module API](https://www.baeldung.com/java-9-module-api)
- [Java 9 Platform Logging API](https://www.baeldung.com/java-9-logging-api)
- [Filtering a Stream of Optionals in Java](https://www.baeldung.com/java-filter-stream-of-optional)

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@ -0,0 +1,10 @@
=========
## Core Java Collections Array List Cookbooks and Examples
### Relevant Articles:
- [Immutable ArrayList in Java](http://www.baeldung.com/java-immutable-list)
- [Guide to the Java ArrayList](http://www.baeldung.com/java-arraylist)
- [Add Multiple Items to an Java ArrayList](http://www.baeldung.com/java-add-items-array-list)
- [ClassCastException: Arrays$ArrayList cannot be cast to ArrayList](https://www.baeldung.com/java-classcastexception-arrays-arraylist)
- [Multi Dimensional ArrayList in Java](https://www.baeldung.com/java-multi-dimensional-arraylist)

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@ -0,0 +1,46 @@
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<artifactId>core-java-collections-array-list</artifactId>
<version>0.1.0-SNAPSHOT</version>
<name>core-java-collections-array-list</name>
<packaging>jar</packaging>
<parent>
<groupId>com.baeldung</groupId>
<artifactId>parent-java</artifactId>
<version>0.0.1-SNAPSHOT</version>
<relativePath>../../parent-java</relativePath>
</parent>
<dependencies>
<dependency>
<groupId>org.apache.commons</groupId>
<artifactId>commons-collections4</artifactId>
<version>${commons-collections4.version}</version>
</dependency>
<dependency>
<groupId>org.apache.commons</groupId>
<artifactId>commons-lang3</artifactId>
<version>${commons-lang3.version}</version>
</dependency>
<dependency>
<groupId>org.assertj</groupId>
<artifactId>assertj-core</artifactId>
<version>${assertj.version}</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<version>${lombok.version}</version>
<scope>provided</scope>
</dependency>
</dependencies>
<properties>
<commons-collections4.version>4.1</commons-collections4.version>
<commons-lang3.version>3.8.1</commons-lang3.version>
<assertj.version>3.11.1</assertj.version>
</properties>
</project>

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@ -0,0 +1,28 @@
package com.baeldung.java.list;
public class Flower {
private String name;
private int petals;
public Flower(String name, int petals) {
this.name = name;
this.petals = petals;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public int getPetals() {
return petals;
}
public void setPetals(int petals) {
this.petals = petals;
}
}

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@ -0,0 +1,13 @@
<?xml version="1.0" encoding="UTF-8"?>
<configuration>
<appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
<encoder>
<pattern>%d{HH:mm:ss.SSS} [%thread] %-5level %logger{36} - %msg%n
</pattern>
</encoder>
</appender>
<root level="INFO">
<appender-ref ref="STDOUT" />
</root>
</configuration>

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@ -0,0 +1,17 @@
=========
## Core Java Collections List Cookbooks and Examples
### Relevant Articles:
- [Check If Two Lists are Equal in Java](http://www.baeldung.com/java-test-a-list-for-ordinality-and-equality)
- [Java 8 Streams: Find Items From One List Based On Values From Another List](https://www.baeldung.com/java-streams-find-list-items)
- [A Guide to the Java LinkedList](http://www.baeldung.com/java-linkedlist)
- [Java List UnsupportedOperationException](http://www.baeldung.com/java-list-unsupported-operation-exception)
- [Java List Initialization in One Line](https://www.baeldung.com/java-init-list-one-line)
- [Ways to Iterate Over a List in Java](https://www.baeldung.com/java-iterate-list)
- [Flattening Nested Collections in Java](http://www.baeldung.com/java-flatten-nested-collections)
- [Intersection of Two Lists in Java](https://www.baeldung.com/java-lists-intersection)
- [Determine If All Elements Are the Same in a Java List](https://www.baeldung.com/java-list-all-equal)
- [List of Primitive Integer Values in Java](https://www.baeldung.com/java-list-primitive-int)
- [Performance Comparison of Primitive Lists in Java](https://www.baeldung.com/java-list-primitive-performance)
- [Filtering a Java Collection by a List](https://www.baeldung.com/java-filter-collection-by-list)

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@ -0,0 +1,76 @@
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<artifactId>core-java-collections-list-2</artifactId>
<version>0.1.0-SNAPSHOT</version>
<name>core-java-collections-list-2</name>
<packaging>jar</packaging>
<parent>
<groupId>com.baeldung</groupId>
<artifactId>parent-java</artifactId>
<version>0.0.1-SNAPSHOT</version>
<relativePath>../../parent-java</relativePath>
</parent>
<dependencies>
<dependency>
<groupId>org.apache.commons</groupId>
<artifactId>commons-collections4</artifactId>
<version>${commons-collections4.version}</version>
</dependency>
<dependency>
<groupId>org.apache.commons</groupId>
<artifactId>commons-lang3</artifactId>
<version>${commons-lang3.version}</version>
</dependency>
<dependency>
<groupId>org.assertj</groupId>
<artifactId>assertj-core</artifactId>
<version>${assertj.version}</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<version>${lombok.version}</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>net.sf.trove4j</groupId>
<artifactId>trove4j</artifactId>
<version>${trove4j.version}</version>
</dependency>
<dependency>
<groupId>it.unimi.dsi</groupId>
<artifactId>fastutil</artifactId>
<version>${fastutil.version}</version>
</dependency>
<dependency>
<groupId>colt</groupId>
<artifactId>colt</artifactId>
<version>${colt.version}</version>
</dependency>
<dependency>
<groupId>org.openjdk.jmh</groupId>
<artifactId>jmh-core</artifactId>
<version>${jmh-core.version}</version>
</dependency>
<dependency>
<groupId>org.openjdk.jmh</groupId>
<artifactId>jmh-generator-annprocess</artifactId>
<version>${jmh-core.version}</version>
</dependency>
</dependencies>
<properties>
<commons-collections4.version>4.1</commons-collections4.version>
<commons-lang3.version>3.8.1</commons-lang3.version>
<assertj.version>3.11.1</assertj.version>
<trove4j.version>3.0.2</trove4j.version>
<fastutil.version>8.1.0</fastutil.version>
<colt.version>1.2.0</colt.version>
</properties>
</project>

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@ -0,0 +1,13 @@
<?xml version="1.0" encoding="UTF-8"?>
<configuration>
<appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
<encoder>
<pattern>%d{HH:mm:ss.SSS} [%thread] %-5level %logger{36} - %msg%n
</pattern>
</encoder>
</appender>
<root level="INFO">
<appender-ref ref="STDOUT" />
</root>
</configuration>

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@ -3,31 +3,14 @@
## Core Java Collections List Cookbooks and Examples
### Relevant Articles:
- [Immutable ArrayList in Java](http://www.baeldung.com/java-immutable-list)
- [Guide to the Java ArrayList](http://www.baeldung.com/java-arraylist)
- [Java Get Random Item/Element From a List](http://www.baeldung.com/java-random-list-element)
- [Removing all nulls from a List in Java](http://www.baeldung.com/java-remove-nulls-from-list)
- [Removing all duplicates from a List in Java](http://www.baeldung.com/java-remove-duplicates-from-list)
- [How to TDD a List Implementation in Java](http://www.baeldung.com/java-test-driven-list)
- [Iterating Backward Through a List](http://www.baeldung.com/java-list-iterate-backwards)
- [Add Multiple Items to an Java ArrayList](http://www.baeldung.com/java-add-items-array-list)
- [Remove the First Element from a List](http://www.baeldung.com/java-remove-first-element-from-list)
- [How to Find an Element in a List with Java](http://www.baeldung.com/find-list-element-java)
- [Copy a List to Another List in Java](http://www.baeldung.com/java-copy-list-to-another)
- [Finding Max/Min of a List or Collection](http://www.baeldung.com/java-collection-min-max)
- [Collections.emptyList() vs. New List Instance](https://www.baeldung.com/java-collections-emptylist-new-list)
- [Remove All Occurrences of a Specific Value from a List](https://www.baeldung.com/java-remove-value-from-list)
- [Check If Two Lists are Equal in Java](http://www.baeldung.com/java-test-a-list-for-ordinality-and-equality)
- [Java 8 Streams: Find Items From One List Based On Values From Another List](https://www.baeldung.com/java-streams-find-list-items)
- [A Guide to the Java LinkedList](http://www.baeldung.com/java-linkedlist)
- [Java List UnsupportedOperationException](http://www.baeldung.com/java-list-unsupported-operation-exception)
- [Java List Initialization in One Line](https://www.baeldung.com/java-init-list-one-line)
- [Ways to Iterate Over a List in Java](https://www.baeldung.com/java-iterate-list)
- [ClassCastException: Arrays$ArrayList cannot be cast to ArrayList](https://www.baeldung.com/java-classcastexception-arrays-arraylist)
- [Flattening Nested Collections in Java](http://www.baeldung.com/java-flatten-nested-collections)
- [Intersection of Two Lists in Java](https://www.baeldung.com/java-lists-intersection)
- [Multi Dimensional ArrayList in Java](https://www.baeldung.com/java-multi-dimensional-arraylist)
- [Determine If All Elements Are the Same in a Java List](https://www.baeldung.com/java-list-all-equal)
- [List of Primitive Integer Values in Java](https://www.baeldung.com/java-list-primitive-int)
- [Performance Comparison of Primitive Lists in Java](https://www.baeldung.com/java-list-primitive-performance)
- [Filtering a Java Collection by a List](https://www.baeldung.com/java-filter-collection-by-list)
- [Remove All Occurrences of a Specific Value from a List](https://www.baeldung.com/java-remove-value-from-list)

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@ -36,42 +36,12 @@
<version>${lombok.version}</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>net.sf.trove4j</groupId>
<artifactId>trove4j</artifactId>
<version>${trove4j.version}</version>
</dependency>
<dependency>
<groupId>it.unimi.dsi</groupId>
<artifactId>fastutil</artifactId>
<version>${fastutil.version}</version>
</dependency>
<dependency>
<groupId>colt</groupId>
<artifactId>colt</artifactId>
<version>${colt.version}</version>
</dependency>
<dependency>
<groupId>org.openjdk.jmh</groupId>
<artifactId>jmh-core</artifactId>
<version>${jmh-core.version}</version>
</dependency>
<dependency>
<groupId>org.openjdk.jmh</groupId>
<artifactId>jmh-generator-annprocess</artifactId>
<version>${jmh-core.version}</version>
</dependency>
</dependencies>
<properties>
<commons-collections4.version>4.1</commons-collections4.version>
<commons-lang3.version>3.8.1</commons-lang3.version>
<avaitility.version>1.7.0</avaitility.version>
<assertj.version>3.11.1</assertj.version>
<trove4j.version>3.0.2</trove4j.version>
<fastutil.version>8.1.0</fastutil.version>
<colt.version>1.2.0</colt.version>
</properties>
</project>

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@ -40,3 +40,4 @@
- [How to Write to a CSV File in Java](https://www.baeldung.com/java-csv)
- [List Files in a Directory in Java](https://www.baeldung.com/java-list-directory-files)
- [Java InputStream to Byte Array and ByteBuffer](https://www.baeldung.com/convert-input-stream-to-array-of-bytes)
- [Introduction to the Java NIO Selector](https://www.baeldung.com/java-nio-selector)

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@ -0,0 +1,30 @@
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<artifactId>consumermodule</artifactId>
<packaging>jar</packaging>
<version>1.0</version>
<parent>
<groupId>com.baeldung.decoupling-pattern1</groupId>
<artifactId>decoupling-pattern1</artifactId>
<version>1.0</version>
</parent>
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
</plugin>
</plugins>
</build>
<dependencies>
<dependency>
<groupId>com.baeldung.servicemodule</groupId>
<artifactId>servicemodule</artifactId>
<version>1.0</version>
</dependency>
</dependencies>
</project>

View File

@ -0,0 +1,13 @@
package com.baeldung.consumermodule;
import com.baeldung.servicemodule.external.TextService;
import com.baeldung.servicemodule.external.TextServiceFactory;
public class Application {
public static void main(String args[]) {
TextService textService = TextServiceFactory.getTextService("lowercase");
System.out.println(textService.processText("Hello from Baeldung!"));
}
}

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@ -0,0 +1,3 @@
module com.baeldung.consumermodule {
requires com.baeldung.servicemodule;
}

View File

@ -0,0 +1,35 @@
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.baeldung.decoupling-pattern1</groupId>
<artifactId>decoupling-pattern1</artifactId>
<version>1.0</version>
<packaging>pom</packaging>
<modules>
<module>servicemodule</module>
<module>consumermodule</module>
</modules>
<build>
<pluginManagement>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>3.8.0</version>
<configuration>
<source>11</source>
<target>11</target>
</configuration>
</plugin>
</plugins>
</pluginManagement>
</build>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
</properties>
</project>

View File

@ -0,0 +1,24 @@
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.baeldung.servicemodule</groupId>
<artifactId>servicemodule</artifactId>
<packaging>jar</packaging>
<parent>
<groupId>com.baeldung.decoupling-pattern1</groupId>
<artifactId>decoupling-pattern1</artifactId>
<version>1.0</version>
</parent>
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
</plugin>
</plugins>
</build>
</project>

View File

@ -0,0 +1,7 @@
package com.baeldung.servicemodule.external;
public interface TextService {
String processText(String text);
}

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@ -0,0 +1,14 @@
package com.baeldung.servicemodule.external;
import com.baeldung.servicemodule.internal.LowercaseTextService;
import com.baeldung.servicemodule.internal.UppercaseTextService;
public class TextServiceFactory {
private TextServiceFactory() {}
public static TextService getTextService(String name) {
return name.equalsIgnoreCase("lowercase") ? new LowercaseTextService(): new UppercaseTextService();
}
}

View File

@ -0,0 +1,12 @@
package com.baeldung.servicemodule.internal;
import com.baeldung.servicemodule.external.TextService;
public class LowercaseTextService implements TextService {
@Override
public String processText(String text) {
return text.toLowerCase();
}
}

View File

@ -0,0 +1,12 @@
package com.baeldung.servicemodule.internal;
import com.baeldung.servicemodule.external.TextService;
public class UppercaseTextService implements TextService {
@Override
public String processText(String text) {
return text.toUpperCase();
}
}

View File

@ -0,0 +1,3 @@
module com.baeldung.servicemodule {
exports com.baeldung.servicemodule.external;
}

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@ -0,0 +1,38 @@
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<parent>
<artifactId>com.baeldung.decoupling-pattern2</artifactId>
<groupId>decoupling-pattern2</groupId>
<version>1.0-SNAPSHOT</version>
</parent>
<modelVersion>4.0.0</modelVersion>
<groupId>com.baeldung.consumermodule</groupId>
<artifactId>consumermodule</artifactId>
<version>1.0</version>
<dependencies>
<dependency>
<groupId>com.baeldung.servicemodule</groupId>
<artifactId>servicemodule</artifactId>
<version>1.0</version>
</dependency>
<dependency>
<groupId>com.baeldung.providermodule</groupId>
<artifactId>providermodule</artifactId>
<version>1.0</version>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
</plugin>
</plugins>
</build>
</project>

View File

@ -0,0 +1,15 @@
package com.baeldung.consumermodule;
import com.baeldung.servicemodule.TextService;
import java.util.ServiceLoader;
public class Application {
public static void main(String[] args) {
ServiceLoader<TextService> services = ServiceLoader.load(TextService.class);
for (final TextService service: services) {
System.out.println("The service " + service.getClass().getSimpleName() + " says: " + service.parseText("Hello from Baeldung!"));
}
}
}

View File

@ -0,0 +1,4 @@
module com.baeldung.consumermodule {
requires com.baeldung.servicemodule;
uses com.baeldung.servicemodule.TextService;
}

View File

@ -0,0 +1,34 @@
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.baeldung.decoupling-pattern2</groupId>
<artifactId>decoupling-pattern2</artifactId>
<version>1.0-SNAPSHOT</version>
<packaging>pom</packaging>
<modules>
<module>servicemodule</module>
<module>providermodule</module>
<module>consumermodule</module>
</modules>
<build>
<pluginManagement>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>3.8.0</version>
<configuration>
<source>11</source>
<target>11</target>
</configuration>
</plugin>
</plugins>
</pluginManagement>
</build>
</project>

View File

@ -0,0 +1,34 @@
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.baeldung.providermodule</groupId>
<artifactId>providermodule</artifactId>
<version>1.0</version>
<parent>
<artifactId>com.baeldung.decoupling-pattern2</artifactId>
<groupId>decoupling-pattern2</groupId>
<version>1.0-SNAPSHOT</version>
</parent>
<dependencies>
<dependency>
<groupId>com.baeldung.servicemodule</groupId>
<artifactId>servicemodule</artifactId>
<version>1.0</version>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
</plugin>
</plugins>
</build>
</project>

View File

@ -0,0 +1,10 @@
package com.baeldung.providermodule;
import com.baeldung.servicemodule.TextService;
public class LowercaseTextService implements TextService {
@Override
public String parseText(String text) {
return text.toLowerCase();
}
}

View File

@ -0,0 +1,4 @@
module com.baeldung.providermodule {
requires com.baeldung.servicemodule;
provides com.baeldung.servicemodule.TextService with com.baeldung.providermodule.LowercaseTextService;
}

View File

@ -0,0 +1,25 @@
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<parent>
<artifactId>>com.baeldung.decoupling-pattern2</artifactId>
<groupId>decoupling-pattern2</groupId>
<version>1.0-SNAPSHOT</version>
</parent>
<groupId>com.baeldung.servicemodule</groupId>
<artifactId>servicemodule</artifactId>
<version>1.0</version>
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
</plugin>
</plugins>
</build>
</project>

View File

@ -0,0 +1,6 @@
package com.baeldung.servicemodule;
public interface TextService {
String parseText(String text);
}

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@ -0,0 +1,3 @@
module com.baeldung.servicemodule {
exports com.baeldung.servicemodule;
}

View File

@ -0,0 +1,3 @@
## Relevant Articles
- [Void Type in Java](https://www.baeldung.com/java-void-type)

View File

@ -51,3 +51,4 @@
- [Java Bitwise Operators](https://www.baeldung.com/java-bitwise-operators)
- [Guide to Creating and Running a Jar File in Java](https://www.baeldung.com/java-create-jar)
- [Making a JSON POST Request With HttpURLConnection](https://www.baeldung.com/httpurlconnection-post)
- [Convert Hex to ASCII in Java](https://www.baeldung.com/java-convert-hex-to-ascii)

View File

@ -0,0 +1,3 @@
## Relevant Articles
- [Java 9 Migration Issues and Resolutions](https://www.baeldung.com/java-9-migration-issue)

View File

@ -0,0 +1,15 @@
package com.baeldung.ddd.order.doubledispatch;
import org.joda.money.CurrencyUnit;
import org.joda.money.Money;
public class AmountBasedDiscountPolicy implements DiscountPolicy {
@Override
public double discount(Order order) {
if (order.totalCost()
.isGreaterThan(Money.of(CurrencyUnit.USD, 500.00))) {
return 0.10;
} else
return 0;
}
}

View File

@ -0,0 +1,5 @@
package com.baeldung.ddd.order.doubledispatch;
public interface DiscountPolicy {
double discount(Order order);
}

View File

@ -0,0 +1,8 @@
package com.baeldung.ddd.order.doubledispatch;
public class FlatDiscountPolicy implements DiscountPolicy {
@Override
public double discount(Order order) {
return 0.01;
}
}

View File

@ -0,0 +1,29 @@
package com.baeldung.ddd.order.doubledispatch;
import java.math.RoundingMode;
import java.util.List;
import org.joda.money.Money;
import com.baeldung.ddd.order.OrderLine;
import com.baeldung.ddd.order.doubledispatch.visitor.OrderVisitor;
import com.baeldung.ddd.order.doubledispatch.visitor.Visitable;
public class Order extends com.baeldung.ddd.order.Order implements Visitable<OrderVisitor> {
public Order(List<OrderLine> orderLines) {
super(orderLines);
}
public Money totalCost(SpecialDiscountPolicy discountPolicy) {
return totalCost().multipliedBy(1 - applyDiscountPolicy(discountPolicy), RoundingMode.HALF_UP);
}
protected double applyDiscountPolicy(SpecialDiscountPolicy discountPolicy) {
return discountPolicy.discount(this);
}
@Override
public void accept(OrderVisitor visitor) {
visitor.visit(this);
}
}

View File

@ -0,0 +1,5 @@
package com.baeldung.ddd.order.doubledispatch;
public interface SpecialDiscountPolicy extends DiscountPolicy {
double discount(SpecialOrder order);
}

View File

@ -0,0 +1,36 @@
package com.baeldung.ddd.order.doubledispatch;
import java.util.List;
import com.baeldung.ddd.order.OrderLine;
import com.baeldung.ddd.order.doubledispatch.visitor.OrderVisitor;
public class SpecialOrder extends Order {
private boolean eligibleForExtraDiscount;
public SpecialOrder(List<OrderLine> orderLines) {
super(orderLines);
this.eligibleForExtraDiscount = false;
}
public SpecialOrder(List<OrderLine> orderLines, boolean eligibleForSpecialDiscount) {
super(orderLines);
this.eligibleForExtraDiscount = eligibleForSpecialDiscount;
}
public boolean isEligibleForExtraDiscount() {
return eligibleForExtraDiscount;
}
@Override
protected double applyDiscountPolicy(SpecialDiscountPolicy discountPolicy) {
return discountPolicy.discount(this);
}
@Override
public void accept(OrderVisitor visitor) {
visitor.visit(this);
}
}

View File

@ -0,0 +1,24 @@
package com.baeldung.ddd.order.doubledispatch.visitor;
import com.baeldung.ddd.order.doubledispatch.Order;
import com.baeldung.ddd.order.doubledispatch.SpecialOrder;
public class HtmlOrderViewCreator implements OrderVisitor {
private String html;
public String getHtml() {
return html;
}
@Override
public void visit(Order order) {
html = String.format("<p>Regular order total cost: %s</p>", order.totalCost());
}
@Override
public void visit(SpecialOrder order) {
html = String.format("<h1>Special Order</h1><p>total cost: %s</p>", order.totalCost());
}
}

View File

@ -0,0 +1,9 @@
package com.baeldung.ddd.order.doubledispatch.visitor;
import com.baeldung.ddd.order.doubledispatch.Order;
import com.baeldung.ddd.order.doubledispatch.SpecialOrder;
public interface OrderVisitor {
void visit(Order order);
void visit(SpecialOrder order);
}

View File

@ -0,0 +1,5 @@
package com.baeldung.ddd.order.doubledispatch.visitor;
public interface Visitable<V> {
void accept(V visitor);
}

View File

@ -92,7 +92,7 @@ class JpaOrder {
}
void removeLineItem(int line) {
JpaOrderLine removedLine = orderLines.remove(line);
orderLines.remove(line);
}
void setCurrencyUnit(String currencyUnit) {

View File

@ -15,7 +15,7 @@ class JpaProduct {
public JpaProduct(BigDecimal price, String currencyUnit) {
super();
this.price = price;
currencyUnit = currencyUnit;
this.currencyUnit = currencyUnit;
}
@Override

View File

@ -0,0 +1,17 @@
package com.baeldung.ddd.order;
import java.util.Arrays;
import java.util.List;
import org.joda.money.CurrencyUnit;
import org.joda.money.Money;
public class OrderFixtureUtils {
public static List<OrderLine> anyOrderLines() {
return Arrays.asList(new OrderLine(new Product(Money.of(CurrencyUnit.USD, 100)), 1));
}
public static List<OrderLine> orderLineItemsWorthNDollars(int totalCost) {
return Arrays.asList(new OrderLine(new Product(Money.of(CurrencyUnit.USD, totalCost)), 1));
}
}

View File

@ -0,0 +1,77 @@
package com.baeldung.ddd.order.doubledispatch;
import static org.assertj.core.api.Assertions.assertThat;
import org.joda.money.CurrencyUnit;
import org.joda.money.Money;
import org.junit.jupiter.api.DisplayName;
import org.junit.jupiter.api.Test;
import com.baeldung.ddd.order.OrderFixtureUtils;
public class DoubleDispatchDiscountPolicyUnitTest {
// @formatter:off
@DisplayName(
"given regular order with items worth $100 total, " +
"when apply 10% discount policy, " +
"then cost after discount is $90"
)
// @formatter:on
@Test
void test() throws Exception {
// given
Order order = new Order(OrderFixtureUtils.orderLineItemsWorthNDollars(100));
SpecialDiscountPolicy discountPolicy = new SpecialDiscountPolicy() {
@Override
public double discount(Order order) {
return 0.10;
}
@Override
public double discount(SpecialOrder order) {
return 0;
}
};
// when
Money totalCostAfterDiscount = order.totalCost(discountPolicy);
// then
assertThat(totalCostAfterDiscount).isEqualTo(Money.of(CurrencyUnit.USD, 90));
}
// @formatter:off
@DisplayName(
"given special order eligible for extra discount with items worth $100 total, " +
"when apply 20% discount policy for extra discount orders, " +
"then cost after discount is $80"
)
// @formatter:on
@Test
void test1() throws Exception {
// given
boolean eligibleForExtraDiscount = true;
Order order = new SpecialOrder(OrderFixtureUtils.orderLineItemsWorthNDollars(100), eligibleForExtraDiscount);
SpecialDiscountPolicy discountPolicy = new SpecialDiscountPolicy() {
@Override
public double discount(Order order) {
return 0;
}
@Override
public double discount(SpecialOrder order) {
if (order.isEligibleForExtraDiscount())
return 0.20;
return 0.10;
}
};
// when
Money totalCostAfterDiscount = order.totalCost(discountPolicy);
// then
assertThat(totalCostAfterDiscount).isEqualTo(Money.of(CurrencyUnit.USD, 80.00));
}
}

View File

@ -0,0 +1,43 @@
package com.baeldung.ddd.order.doubledispatch;
import static org.assertj.core.api.Assertions.assertThat;
import java.util.Arrays;
import java.util.List;
import org.junit.jupiter.api.DisplayName;
import org.junit.jupiter.api.Test;
import com.baeldung.ddd.order.doubledispatch.Order;
import com.baeldung.ddd.order.OrderFixtureUtils;
import com.baeldung.ddd.order.OrderLine;
import com.baeldung.ddd.order.doubledispatch.visitor.HtmlOrderViewCreator;
public class HtmlOrderViewCreatorUnitTest {
// @formatter:off
@DisplayName(
"given collection of regular and special orders, " +
"when create HTML view using visitor for each order, " +
"then the dedicated view is created for each order"
)
// @formatter:on
@Test
void test() throws Exception {
// given
List<OrderLine> anyOrderLines = OrderFixtureUtils.anyOrderLines();
List<Order> orders = Arrays.asList(new Order(anyOrderLines), new SpecialOrder(anyOrderLines));
HtmlOrderViewCreator htmlOrderViewCreator = new HtmlOrderViewCreator();
// when
orders.get(0)
.accept(htmlOrderViewCreator);
String regularOrderHtml = htmlOrderViewCreator.getHtml();
orders.get(1)
.accept(htmlOrderViewCreator);
String specialOrderHtml = htmlOrderViewCreator.getHtml();
// then
assertThat(regularOrderHtml).containsPattern("<p>Regular order total cost: .*</p>");
assertThat(specialOrderHtml).containsPattern("<h1>Special Order</h1><p>total cost: .*</p>");
}
}

View File

@ -0,0 +1,50 @@
package com.baeldung.ddd.order.doubledispatch;
import static org.assertj.core.api.Assertions.assertThat;
import java.util.List;
import org.junit.jupiter.api.DisplayName;
import org.junit.jupiter.api.Test;
import com.baeldung.ddd.order.doubledispatch.Order;
import com.baeldung.ddd.order.OrderFixtureUtils;
import com.baeldung.ddd.order.OrderLine;
import com.baeldung.ddd.order.doubledispatch.SpecialDiscountPolicy;
import com.baeldung.ddd.order.doubledispatch.SpecialOrder;
public class MethodOverloadExampleUnitTest {
// @formatter:off
@DisplayName(
"given discount policy accepting special orders, " +
"when apply the policy on special order declared as regular order, " +
"then regular discount method is used"
)
// @formatter:on
@Test
void test() throws Exception {
// given
SpecialDiscountPolicy specialPolicy = new SpecialDiscountPolicy() {
@Override
public double discount(Order order) {
return 0.01;
}
@Override
public double discount(SpecialOrder order) {
return 0.10;
}
};
Order specialOrder = new SpecialOrder(anyOrderLines());
// when
double discount = specialPolicy.discount(specialOrder);
// then
assertThat(discount).isEqualTo(0.01);
}
private List<OrderLine> anyOrderLines() {
return OrderFixtureUtils.anyOrderLines();
}
}

View File

@ -0,0 +1,37 @@
package com.baeldung.ddd.order.doubledispatch;
import static org.assertj.core.api.Assertions.assertThat;
import org.junit.jupiter.api.DisplayName;
import org.junit.jupiter.api.Test;
import com.baeldung.ddd.order.OrderFixtureUtils;
public class SingleDispatchDiscountPolicyUnitTest {
// @formatter:off
@DisplayName(
"given two discount policies, " +
"when use these policies, " +
"then single dispatch chooses the implementation based on runtime type"
)
// @formatter:on
@Test
void test() throws Exception {
// given
DiscountPolicy flatPolicy = new FlatDiscountPolicy();
DiscountPolicy amountPolicy = new AmountBasedDiscountPolicy();
Order orderWorth501Dollars = orderWorthNDollars(501);
// when
double flatDiscount = flatPolicy.discount(orderWorth501Dollars);
double amountDiscount = amountPolicy.discount(orderWorth501Dollars);
// then
assertThat(flatDiscount).isEqualTo(0.01);
assertThat(amountDiscount).isEqualTo(0.1);
}
private Order orderWorthNDollars(int totalCost) {
return new Order(OrderFixtureUtils.orderLineItemsWorthNDollars(totalCost));
}
}

View File

@ -1,4 +1,8 @@
# Guava
### Relevant Articles:
## Relevant Articles:
- [Guava Sets](http://www.baeldung.com/guava-sets)
- [Guide to Guava RangeSet](http://www.baeldung.com/guava-rangeset)
- [Guava Set + Function = Map](http://www.baeldung.com/guava-set-function-map-tutorial)
- [Guide to Guava Multiset](https://www.baeldung.com/guava-multiset)

View File

@ -1,14 +1,9 @@
package org.baeldung.guava;
import java.util.AbstractMap;
import java.util.AbstractSet;
import java.util.Iterator;
import java.util.Map;
import java.util.Set;
import java.util.WeakHashMap;
import com.google.common.base.Function;
import java.util.*;
public class GuavaMapFromSet<K, V> extends AbstractMap<K, V> {
private class SingleEntry implements Entry<K, V> {

View File

@ -1,15 +1,14 @@
package org.baeldung.guava;
import static org.junit.Assert.assertTrue;
import com.google.common.base.Function;
import org.junit.Test;
import java.util.Arrays;
import java.util.Map;
import java.util.Set;
import java.util.TreeSet;
import org.junit.Test;
import com.google.common.base.Function;
import static org.junit.Assert.assertTrue;
public class GuavaMapFromSetUnitTest {

View File

@ -1,13 +1,12 @@
package org.baeldung.guava;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertTrue;
import static org.junit.Assert.assertFalse;
import org.junit.Test;
import com.google.common.collect.ImmutableRangeSet;
import com.google.common.collect.Range;
import com.google.common.collect.RangeSet;
import com.google.common.collect.TreeRangeSet;
import org.junit.Test;
import static org.junit.Assert.*;
public class GuavaRangeSetUnitTest {
@ -122,6 +121,5 @@ public class GuavaRangeSetUnitTest {
.add(Range.closed(0, 2))
.add(Range.closed(3, 5))
.add(Range.closed(5, 8)).build();
}
}

View File

@ -0,0 +1,131 @@
package org.baeldung.guava;
import com.google.common.base.Function;
import com.google.common.base.Joiner;
import com.google.common.collect.*;
import org.junit.Test;
import java.util.List;
import java.util.Set;
import static org.hamcrest.Matchers.contains;
import static org.hamcrest.Matchers.containsInAnyOrder;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertThat;
import static org.junit.Assert.assertTrue;
public class GuavaSetOperationsUnitTest {
@Test
public void whenCalculatingUnionOfSets_thenCorrect() {
final Set<Character> first = ImmutableSet.of('a', 'b', 'c');
final Set<Character> second = ImmutableSet.of('b', 'c', 'd');
final Set<Character> union = Sets.union(first, second);
assertThat(union, containsInAnyOrder('a', 'b', 'c', 'd'));
}
@Test
public void whenCalculatingCartesianProductOfSets_thenCorrect() {
final Set<Character> first = ImmutableSet.of('a', 'b');
final Set<Character> second = ImmutableSet.of('c', 'd');
final Set<List<Character>> result = Sets.cartesianProduct(ImmutableList.of(first, second));
final Function<List<Character>, String> func = new Function<List<Character>, String>() {
@Override
public final String apply(final List<Character> input) {
return Joiner
.on(" ").join(input);
}
};
final Iterable<String> joined = Iterables.transform(result, func);
assertThat(joined, containsInAnyOrder("a c", "a d", "b c", "b d"));
}
@Test
public void whenCalculatingSetIntersection_thenCorrect() {
final Set<Character> first = ImmutableSet.of('a', 'b', 'c');
final Set<Character> second = ImmutableSet.of('b', 'c', 'd');
final Set<Character> intersection = Sets.intersection(first, second);
assertThat(intersection, containsInAnyOrder('b', 'c'));
}
@Test
public void whenCalculatingSetSymmetricDifference_thenCorrect() {
final Set<Character> first = ImmutableSet.of('a', 'b', 'c');
final Set<Character> second = ImmutableSet.of('b', 'c', 'd');
final Set<Character> intersection = Sets.symmetricDifference(first, second);
assertThat(intersection, containsInAnyOrder('a', 'd'));
}
@Test
public void whenCalculatingPowerSet_thenCorrect() {
final Set<Character> chars = ImmutableSet.of('a', 'b');
final Set<Set<Character>> result = Sets.powerSet(chars);
final Set<Character> empty = ImmutableSet.<Character> builder().build();
final Set<Character> a = ImmutableSet.of('a');
final Set<Character> b = ImmutableSet.of('b');
final Set<Character> aB = ImmutableSet.of('a', 'b');
assertThat(result, contains(empty, a, b, aB));
}
@Test
public void whenCreatingRangeOfIntegersSet_thenCreated() {
final int start = 10;
final int end = 30;
final ContiguousSet<Integer> set = ContiguousSet.create(Range.closed(start, end), DiscreteDomain.integers());
assertEquals(21, set.size());
assertEquals(10, set.first().intValue());
assertEquals(30, set.last().intValue());
}
@Test
public void whenUsingRangeSet_thenCorrect() {
final RangeSet<Integer> rangeSet = TreeRangeSet.create();
rangeSet.add(Range.closed(1, 10));
rangeSet.add(Range.closed(12, 15));
assertEquals(2, rangeSet.asRanges().size());
rangeSet.add(Range.closed(10, 12));
assertTrue(rangeSet.encloses(Range.closed(1, 15)));
assertEquals(1, rangeSet.asRanges().size());
}
@Test
public void whenInsertDuplicatesInMultiSet_thenInserted() {
final Multiset<String> names = HashMultiset.create();
names.add("John");
names.add("Adam", 3);
names.add("John");
assertEquals(2, names.count("John"));
names.remove("John");
assertEquals(1, names.count("John"));
assertEquals(3, names.count("Adam"));
names.remove("Adam", 2);
assertEquals(1, names.count("Adam"));
}
@Test
public void whenGetTopOcurringElementsWithMultiSet_thenCorrect() {
final Multiset<String> names = HashMultiset.create();
names.add("John");
names.add("Adam", 5);
names.add("Jane");
names.add("Tom", 2);
final Set<String> sorted = Multisets.copyHighestCountFirst(names).elementSet();
final List<String> topTwo = Lists.newArrayList(sorted).subList(0, 2);
assertEquals(2, topTwo.size());
assertEquals("Adam", topTwo.get(0));
assertEquals("Tom", topTwo.get(1));
}
}

View File

@ -11,13 +11,10 @@
- [Filtering and Transforming Collections in Guava](http://www.baeldung.com/guava-filter-and-transform-a-collection)
- [Guava Join and Split Collections](http://www.baeldung.com/guava-joiner-and-splitter-tutorial)
- [Guava Lists](http://www.baeldung.com/guava-lists)
- [Guava Sets](http://www.baeldung.com/guava-sets)
- [Guava Maps](http://www.baeldung.com/guava-maps)
- [Guide to Guava Multimap](http://www.baeldung.com/guava-multimap)
- [Guide to Guava RangeSet](http://www.baeldung.com/guava-rangeset)
- [Guide to Guava RangeMap](http://www.baeldung.com/guava-rangemap)
- [Guide to Guava MinMaxPriorityQueue and EvictingQueue](http://www.baeldung.com/guava-minmax-priority-queue-and-evicting-queue)
- [Initialize a HashMap in Java](https://www.baeldung.com/java-initialize-hashmap)
- [Guava Set + Function = Map](http://www.baeldung.com/guava-set-function-map-tutorial)
- [Guide to Guava Table](http://www.baeldung.com/guava-table)
- [Guide to Guava ClassToInstanceMap](http://www.baeldung.com/guava-class-to-instance-map)

View File

@ -111,120 +111,6 @@ public class GuavaCollectionTypesUnitTest {
assertThat(immutable, contains("John", "Adam", "Jane", "Tom"));
}
// sets
@Test
public void whenCalculateUnionOfSets_thenCorrect() {
final Set<Character> first = ImmutableSet.of('a', 'b', 'c');
final Set<Character> second = ImmutableSet.of('b', 'c', 'd');
final Set<Character> union = Sets.union(first, second);
assertThat(union, containsInAnyOrder('a', 'b', 'c', 'd'));
}
@Test
public void whenCalculateSetsProduct_thenCorrect() {
final Set<Character> first = ImmutableSet.of('a', 'b');
final Set<Character> second = ImmutableSet.of('c', 'd');
final Set<List<Character>> result = Sets.cartesianProduct(ImmutableList.of(first, second));
final Function<List<Character>, String> func = new Function<List<Character>, String>() {
@Override
public final String apply(final List<Character> input) {
return Joiner.on(" ").join(input);
}
};
final Iterable<String> joined = Iterables.transform(result, func);
assertThat(joined, containsInAnyOrder("a c", "a d", "b c", "b d"));
}
@Test
public void whenCalculatingSetIntersection_thenCorrect() {
final Set<Character> first = ImmutableSet.of('a', 'b', 'c');
final Set<Character> second = ImmutableSet.of('b', 'c', 'd');
final Set<Character> intersection = Sets.intersection(first, second);
assertThat(intersection, containsInAnyOrder('b', 'c'));
}
@Test
public void whenCalculatingSetSymmetricDifference_thenCorrect() {
final Set<Character> first = ImmutableSet.of('a', 'b', 'c');
final Set<Character> second = ImmutableSet.of('b', 'c', 'd');
final Set<Character> intersection = Sets.symmetricDifference(first, second);
assertThat(intersection, containsInAnyOrder('a', 'd'));
}
@Test
public void whenCalculatingPowerSet_thenCorrect() {
final Set<Character> chars = ImmutableSet.of('a', 'b');
final Set<Set<Character>> result = Sets.powerSet(chars);
final Set<Character> empty = ImmutableSet.<Character> builder().build();
final Set<Character> a = ImmutableSet.of('a');
final Set<Character> b = ImmutableSet.of('b');
final Set<Character> aB = ImmutableSet.of('a', 'b');
assertThat(result, contains(empty, a, b, aB));
}
@Test
public void whenCreateRangeOfIntegersSet_thenCreated() {
final int start = 10;
final int end = 30;
final ContiguousSet<Integer> set = ContiguousSet.create(Range.closed(start, end), DiscreteDomain.integers());
assertEquals(21, set.size());
assertEquals(10, set.first().intValue());
assertEquals(30, set.last().intValue());
}
@Test
public void whenCreateRangeSet_thenCreated() {
final RangeSet<Integer> rangeSet = TreeRangeSet.create();
rangeSet.add(Range.closed(1, 10));
rangeSet.add(Range.closed(12, 15));
assertEquals(2, rangeSet.asRanges().size());
rangeSet.add(Range.closed(10, 12));
assertTrue(rangeSet.encloses(Range.closed(1, 15)));
assertEquals(1, rangeSet.asRanges().size());
}
@Test
public void whenInsertDuplicatesInMultiSet_thenInserted() {
final Multiset<String> names = HashMultiset.create();
names.add("John");
names.add("Adam", 3);
names.add("John");
assertEquals(2, names.count("John"));
names.remove("John");
assertEquals(1, names.count("John"));
assertEquals(3, names.count("Adam"));
names.remove("Adam", 2);
assertEquals(1, names.count("Adam"));
}
@Test
public void whenGetTopUsingMultiSet_thenCorrect() {
final Multiset<String> names = HashMultiset.create();
names.add("John");
names.add("Adam", 5);
names.add("Jane");
names.add("Tom", 2);
final Set<String> sorted = Multisets.copyHighestCountFirst(names).elementSet();
final List<String> topTwo = Lists.newArrayList(sorted).subList(0, 2);
assertEquals(2, topTwo.size());
assertEquals("Adam", topTwo.get(0));
assertEquals("Tom", topTwo.get(1));
}
@Test
public void whenCreateImmutableMap_thenCreated() {
final Map<String, Integer> salary = ImmutableMap.<String, Integer> builder().put("John", 1000).put("Jane", 1500).put("Adam", 2000).put("Tom", 2000).build();

View File

@ -1,2 +1,3 @@
## Relevant Articles:
- [Converting Between LocalDate and XMLGregorianCalendar](https://www.baeldung.com/java-localdate-to-xmlgregoriancalendar)
- [Convert Time to Milliseconds in Java](https://www.baeldung.com/java-time-milliseconds)

5
java-strings-2/README.MD Normal file
View File

@ -0,0 +1,5 @@
## Relevant Articles
- [Java Localization Formatting Messages](https://www.baeldung.com/java-localization-messages-formatting)
- [Check If a String Contains a Substring](https://www.baeldung.com/java-string-contains-substring)
- [Removing Stopwords from a String in Java](https://www.baeldung.com/java-string-remove-stopwords)

View File

@ -15,28 +15,6 @@
</parent>
<dependencies>
<dependency>
<groupId>commons-io</groupId>
<artifactId>commons-io</artifactId>
<version>${commons-io.version}</version>
</dependency>
<dependency>
<groupId>log4j</groupId>
<artifactId>log4j</artifactId>
<version>${log4j.version}</version>
</dependency>
<dependency>
<groupId>commons-codec</groupId>
<artifactId>commons-codec</artifactId>
<version>${commons-codec.version}</version>
</dependency>
<!-- test scoped -->
<dependency>
<groupId>org.assertj</groupId>
<artifactId>assertj-core</artifactId>
<version>${assertj.version}</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.openjdk.jmh</groupId>
<artifactId>jmh-core</artifactId>
@ -57,11 +35,6 @@
<artifactId>guava</artifactId>
<version>${guava.version}</version>
</dependency>
<dependency>
<groupId>com.vdurmont</groupId>
<artifactId>emoji-java</artifactId>
<version>${emoji-java.version}</version>
</dependency>
<dependency>
<groupId>org.apache.commons</groupId>
<artifactId>commons-lang3</artifactId>
@ -73,38 +46,18 @@
<version>${junit.version}</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.junit.jupiter</groupId>
<artifactId>junit-jupiter-api</artifactId>
<version>${junit-jupiter-api.version}</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.hamcrest</groupId>
<artifactId>hamcrest-library</artifactId>
<version>${org.hamcrest.version}</version>
<scope>test</scope>
</dependency>
<!-- Added for password generation -->
<dependency>
<groupId>org.passay</groupId>
<artifactId>passay</artifactId>
<version>${passay.version}</version>
</dependency>
<dependency>
<groupId>org.apache.commons</groupId>
<artifactId>commons-text</artifactId>
<version>${commons-text.version}</version>
</dependency>
<dependency>
<groupId>org.ahocorasick</groupId>
<artifactId>ahocorasick</artifactId>
<version>${ahocorasick.version}</version>
</dependency>
</dependencies>
<build>
@ -131,18 +84,10 @@
</build>
<properties>
<!-- util -->
<commons-lang3.version>3.8.1</commons-lang3.version>
<commons-codec.version>1.10</commons-codec.version>
<!-- testing -->
<assertj.version>3.6.1</assertj.version>
<icu4j.version>61.1</icu4j.version>
<guava.version>27.0.1-jre</guava.version>
<emoji-java.version>4.0.0</emoji-java.version>
<junit-jupiter-api.version>5.3.1</junit-jupiter-api.version>
<passay.version>1.3.1</passay.version>
<commons-text.version>1.4</commons-text.version>
<ahocorasick.version>0.4.0</ahocorasick.version>
</properties>
</project>

View File

@ -0,0 +1,73 @@
package com.baeldung.string.performance;
import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Paths;
import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.TimeUnit;
import java.util.stream.Collectors;
import java.util.stream.Stream;
import org.openjdk.jmh.annotations.Benchmark;
import org.openjdk.jmh.annotations.BenchmarkMode;
import org.openjdk.jmh.annotations.Fork;
import org.openjdk.jmh.annotations.Mode;
import org.openjdk.jmh.annotations.OutputTimeUnit;
import org.openjdk.jmh.annotations.Scope;
import org.openjdk.jmh.annotations.Setup;
import org.openjdk.jmh.annotations.State;
@Fork(value = 3, warmups = 1)
@State(Scope.Benchmark)
@BenchmarkMode(Mode.AverageTime)
@OutputTimeUnit(TimeUnit.MILLISECONDS)
public class RemovingStopwordsPerformanceComparison {
private String data;
private List<String> stopwords;
private String stopwordsRegex;
public static void main(String[] args) throws Exception {
org.openjdk.jmh.Main.main(args);
}
@Setup
public void setup() throws IOException {
data = new String(Files.readAllBytes(Paths.get("src/main/resources/shakespeare-hamlet.txt")));
data = data.toLowerCase();
stopwords = Files.readAllLines(Paths.get("src/main/resources/english_stopwords.txt"));
stopwordsRegex = stopwords.stream().collect(Collectors.joining("|", "\\b(", ")\\b\\s?"));
}
@Benchmark
public String removeManually() {
String[] allWords = data.split(" ");
StringBuilder builder = new StringBuilder();
for(String word:allWords) {
if(! stopwords.contains(word)) {
builder.append(word);
builder.append(' ');
}
}
return builder.toString().trim();
}
@Benchmark
public String removeAll() {
ArrayList<String> allWords = Stream.of(data.split(" "))
.collect(Collectors.toCollection(ArrayList<String>::new));
allWords.removeAll(stopwords);
return allWords.stream().collect(Collectors.joining(" "));
}
@Benchmark
public String replaceRegex() {
return data.replaceAll(stopwordsRegex, "");
}
}

View File

@ -0,0 +1,127 @@
i
me
my
myself
we
our
ours
ourselves
you
your
yours
yourself
yourselves
he
him
his
himself
she
her
hers
herself
it
its
itself
they
them
their
theirs
themselves
what
which
who
whom
this
that
these
those
am
is
are
was
were
be
been
being
have
has
had
having
do
does
did
doing
a
an
the
and
but
if
or
because
as
until
while
of
at
by
for
with
about
against
between
into
through
during
before
after
above
below
to
from
up
down
in
out
on
off
over
under
again
further
then
once
here
there
when
where
why
how
all
any
both
each
few
more
most
other
some
such
no
nor
not
only
own
same
so
than
too
very
s
t
can
will
just
don
should
now

File diff suppressed because it is too large Load Diff

View File

@ -0,0 +1,58 @@
package com.baeldung.initialization;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertTrue;
import static org.junit.Assert.assertFalse;
import org.junit.Test;
public class StringInitializationUnitTest {
private String fieldString;
void printDeclaredOnlyString() {
String localVarString = null;
System.out.println(localVarString); // compilation error
System.out.println(fieldString);
}
@Test
public void givenDeclaredFeldStringAndNullString_thenCompareEquals() {
String localVarString = null;
assertEquals(fieldString, localVarString);
}
@Test
public void givenTwoStringsWithSameLiteral_thenCompareReferencesEquals() {
String literalOne = "Baeldung";
String literalTwo = "Baeldung";
assertTrue(literalOne == literalTwo);
}
@Test
public void givenTwoStringsUsingNew_thenCompareReferencesNotEquals() {
String newStringOne = new String("Baeldung");
String newStringTwo = new String("Baeldung");
assertFalse(newStringOne == newStringTwo);
}
@Test
public void givenEmptyLiteralStringsAndNewObject_thenCompareEquals() {
String emptyLiteral = "";
String emptyNewString = new String("");
assertEquals(emptyLiteral, emptyNewString);
}
@Test
public void givenEmptyStringObjects_thenCompareEquals() {
String emptyNewString = new String("");
String emptyNewStringTwo = new String();
assertEquals(emptyNewString, emptyNewStringTwo);
}
}

View File

@ -0,0 +1,60 @@
package com.baeldung.string;
import static org.junit.Assert.assertEquals;
import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Paths;
import java.util.ArrayList;
import java.util.List;
import java.util.stream.Collectors;
import java.util.stream.Stream;
import org.junit.BeforeClass;
import org.junit.Test;
public class RemoveStopwordsUnitTest {
final String original = "The quick brown fox jumps over the lazy dog";
final String target = "quick brown fox jumps lazy dog";
static List<String> stopwords;
@BeforeClass
public static void loadStopwords() throws IOException {
stopwords = Files.readAllLines(Paths.get("src/main/resources/english_stopwords.txt"));
}
@Test
public void whenRemoveStopwordsManually_thenSuccess() {
String[] allWords = original.toLowerCase()
.split(" ");
StringBuilder builder = new StringBuilder();
for (String word : allWords) {
if (!stopwords.contains(word)) {
builder.append(word);
builder.append(' ');
}
}
String result = builder.toString().trim();
assertEquals(result, target);
}
@Test
public void whenRemoveStopwordsUsingRemoveAll_thenSuccess() {
ArrayList<String> allWords = Stream.of(original.toLowerCase()
.split(" "))
.collect(Collectors.toCollection(ArrayList<String>::new));
allWords.removeAll(stopwords);
String result = allWords.stream().collect(Collectors.joining(" "));
assertEquals(result, target);
}
@Test
public void whenRemoveStopwordsUsingRegex_thenSuccess() {
String stopwordsRegex = stopwords.stream()
.collect(Collectors.joining("|", "\\b(", ")\\b\\s?"));
String result = original.toLowerCase().replaceAll(stopwordsRegex, "");
assertEquals(result, target);
}
}

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