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java-tutorials
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Merge branch 'master' of https://github.com/eugenp/tutorials

This commit is contained in:
Jonathan Cook 2020-05-25 23:08:52 +02:00
parent aa6d896b11 ba8b6d0660
commit 74acf44f1b
378 changed files with 7263 additions and 885 deletions
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2
apache-cxf/README.md
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@ -3,7 +3,7 @@
This module contains articles about Apache CXF
## Relevant Articles:
- [Introduction to Apache CXF Aegis Data Binding](https://www.baeldung.com/aegis-data-binding-in-apache-cxf)
- [Apache CXF Support for RESTful Web Services](https://www.baeldung.com/apache-cxf-rest-api)
- [A Guide to Apache CXF with Spring](https://www.baeldung.com/apache-cxf-with-spring)
- [Introduction to Apache CXF](https://www.baeldung.com/introduction-to-apache-cxf)

3
apache-cxf/cxf-aegis/README.md Normal file
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@ -0,0 +1,3 @@
### Relevant Articles:
- [Introduction to Apache CXF Aegis Data Binding](https://www.baeldung.com/aegis-data-binding-in-apache-cxf)

4
aws-app-sync/src/main/java/com/baeldung/awsappsync/AppSyncClientHelper.java
View File

@ -10,8 +10,8 @@ import java.util.Map;
public class AppSyncClientHelper {
static String apiUrl = "https://m4i3b6icrrb7livfbypfspiifi.appsync-api.us-east-2.amazonaws.com";
static String apiKey = "da2-bm4rpatkkrc5jfyhvvq7itjeke";
static String apiUrl = "<INSERT API URL HERE>";
static String apiKey = "<INSERT API KEY HERE>";
static String API_KEY_HEADER = "x-api-key";
public static WebClient.ResponseSpec getResponseBodySpec(Map<String, Object> requestBody) {

2
aws-app-sync/src/test/java/com/baeldung/awsappsync/AwsAppSyncApplicationTests.java
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@ -1,5 +1,6 @@
package com.baeldung.awsappsync;
import org.junit.jupiter.api.Disabled;
import org.junit.jupiter.api.Test;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.web.reactive.function.client.WebClient;
@ -10,6 +11,7 @@ import java.util.Map;
import static org.junit.jupiter.api.Assertions.*;
@SpringBootTest
@Disabled
class AwsAppSyncApplicationTests {
@Test

4
cas/cas-secured-app/pom.xml
View File

@ -16,10 +16,6 @@
<relativePath>../../parent-boot-2</relativePath>
</parent>
<properties>
<spring-boot.version>2.2.6.RELEASE</spring-boot.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>

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

@ -13,4 +13,5 @@ This module contains articles about core Groovy concepts
- [Metaprogramming in Groovy](https://www.baeldung.com/groovy-metaprogramming)
- [A Quick Guide to Working with Web Services in Groovy](https://www.baeldung.com/groovy-web-services)
- [Categories in Groovy](https://www.baeldung.com/groovy-categories)
- [How to Determine the Data Type in Groovy](https://www.baeldung.com/groovy-determine-data-type)
- [[<-- Prev]](/core-groovy)

1
core-java-modules/core-java-14/README.md
View File

@ -8,3 +8,4 @@ This module contains articles about Java 14.
- [Java Text Blocks](https://www.baeldung.com/java-text-blocks)
- [Pattern Matching for instanceof in Java 14](https://www.baeldung.com/java-pattern-matching-instanceof)
- [Helpful NullPointerExceptions in Java 14](https://www.baeldung.com/java-14-nullpointerexception)
- [Foreign Memory Access API in Java 14](https://www.baeldung.com/java-foreign-memory-access)

7
core-java-modules/core-java-8-2/pom.xml
View File

@ -8,12 +8,11 @@
<version>0.1.0-SNAPSHOT</version>
<name>core-java-8-2</name>
<packaging>jar</packaging>
<parent>
<groupId>com.baeldung</groupId>
<artifactId>parent-java</artifactId>
<groupId>com.baeldung.core-java-modules</groupId>
<artifactId>core-java-modules</artifactId>
<version>0.0.1-SNAPSHOT</version>
<relativePath>../../parent-java</relativePath>
<relativePath>../</relativePath>
</parent>
<dependencies>

7
core-java-modules/core-java-8-datetime-2/pom.xml
View File

@ -8,12 +8,11 @@
<version>${project.parent.version}</version>
<name>core-java-8-datetime</name>
<packaging>jar</packaging>
<parent>
<groupId>com.baeldung</groupId>
<artifactId>parent-java</artifactId>
<groupId>com.baeldung.core-java-modules</groupId>
<artifactId>core-java-modules</artifactId>
<version>0.0.1-SNAPSHOT</version>
<relativePath>../../parent-java</relativePath>
<relativePath>../</relativePath>
</parent>
<dependencies>

7
core-java-modules/core-java-8-datetime/pom.xml
View File

@ -8,12 +8,11 @@
<version>${project.parent.version}</version>
<name>core-java-8-datetime</name>
<packaging>jar</packaging>
<parent>
<groupId>com.baeldung</groupId>
<artifactId>parent-java</artifactId>
<groupId>com.baeldung.core-java-modules</groupId>
<artifactId>core-java-modules</artifactId>
<version>0.0.1-SNAPSHOT</version>
<relativePath>../../parent-java</relativePath>
<relativePath>../</relativePath>
</parent>
<dependencies>

7
core-java-modules/core-java-8/pom.xml
View File

@ -8,12 +8,11 @@
<version>0.1.0-SNAPSHOT</version>
<name>core-java-8</name>
<packaging>jar</packaging>
<parent>
<groupId>com.baeldung</groupId>
<artifactId>parent-java</artifactId>
<groupId>com.baeldung.core-java-modules</groupId>
<artifactId>core-java-modules</artifactId>
<version>0.0.1-SNAPSHOT</version>
<relativePath>../../parent-java</relativePath>
<relativePath>../</relativePath>
</parent>
<dependencies>

1
core-java-modules/core-java-9-improvements/README.md
View File

@ -9,3 +9,4 @@ This module contains articles about the improvements to core Java features intro
- [Java 9 Stream API Improvements](https://www.baeldung.com/java-9-stream-api)
- [Java 9 java.util.Objects Additions](https://www.baeldung.com/java-9-objects-new)
- [Java 9 CompletableFuture API Improvements](https://www.baeldung.com/java-9-completablefuture)
- [Java InputStream to Byte Array and ByteBuffer](https://www.baeldung.com/convert-input-stream-to-array-of-bytes)

5
core-java-modules/core-java-9-improvements/pom.xml
View File

@ -33,6 +33,11 @@
<artifactId>guava</artifactId>
<version>${guava.version}</version>
</dependency>
<dependency>
<groupId>commons-io</groupId>
<artifactId>commons-io</artifactId>
<version>${commons-io.version}</version>
</dependency>
<dependency>
<groupId>org.junit.platform</groupId>
<artifactId>junit-platform-runner</artifactId>

57
core-java-modules/core-java-9-improvements/src/test/java/com/baeldung/java9/io/conversion/InputStreamToByteArrayUnitTest.java Normal file
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@ -0,0 +1,57 @@
package com.baeldung.java9.io.conversion;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import org.apache.commons.io.IOUtils;
import org.junit.Test;
import com.google.common.io.ByteSource;
import com.google.common.io.ByteStreams;
public class InputStreamToByteArrayUnitTest {
@Test
public final void givenUsingPlainJavaOnFixedSizeStream_whenConvertingAnInputStreamToAByteArray_thenCorrect() throws IOException {
final InputStream initialStream = new ByteArrayInputStream(new byte[] { 0, 1, 2 });
final byte[] targetArray = new byte[initialStream.available()];
initialStream.read(targetArray);
}
@Test
public final void givenUsingPlainJavaOnUnknownSizeStream_whenConvertingAnInputStreamToAByteArray_thenCorrect() throws IOException {
final InputStream is = new ByteArrayInputStream(new byte[] { 0, 1, 2 });
final ByteArrayOutputStream buffer = new ByteArrayOutputStream();
int nRead;
final byte[] data = new byte[1024];
while ((nRead = is.read(data, 0, data.length)) != -1) {
buffer.write(data, 0, nRead);
}
buffer.flush();
final byte[] byteArray = buffer.toByteArray();
}
@Test
public void givenUsingPlainJava9_whenConvertingAnInputStreamToAByteArray_thenCorrect() throws IOException {
final InputStream is = new ByteArrayInputStream(new byte[] { 0, 1, 2 });
byte[] data = is.readAllBytes();
}
@Test
public final void givenUsingGuava_whenConvertingAnInputStreamToAByteArray_thenCorrect() throws IOException {
final InputStream initialStream = ByteSource.wrap(new byte[] { 0, 1, 2 })
.openStream();
final byte[] targetArray = ByteStreams.toByteArray(initialStream);
}
@Test
public final void givenUsingCommonsIO_whenConvertingAnInputStreamToAByteArray_thenCorrect() throws IOException {
final InputStream initialStream = new ByteArrayInputStream(new byte[] { 0, 1, 2 });
final byte[] targetArray = IOUtils.toByteArray(initialStream);
}
}

2
core-java-modules/core-java-io-conversions-2/src/test/java/com/baeldung/inputstreamtobytes/InputStreamToByteBufferUnitTest.java → core-java-modules/core-java-9-improvements/src/test/java/com/baeldung/java9/io/conversion/InputStreamToByteBufferUnitTest.java
View File

@ -1,4 +1,4 @@
package com.baeldung.inputstreamtobytes;
package com.baeldung.java9.io.conversion;
import com.google.common.io.ByteSource;
import com.google.common.io.ByteStreams;

7
core-java-modules/core-java-9-streams/pom.xml
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@ -8,12 +8,11 @@
<version>0.1.0-SNAPSHOT</version>
<name>core-java-9-streams</name>
<packaging>jar</packaging>
<parent>
<groupId>com.baeldung</groupId>
<artifactId>parent-java</artifactId>
<groupId>com.baeldung.core-java-modules</groupId>
<artifactId>core-java-modules</artifactId>
<version>0.0.1-SNAPSHOT</version>
<relativePath>../../parent-java</relativePath>
<relativePath>../</relativePath>
</parent>
<build>

6
core-java-modules/core-java-annotations/pom.xml
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@ -10,10 +10,10 @@
<packaging>jar</packaging>
<parent>
<groupId>com.baeldung</groupId>
<artifactId>parent-java</artifactId>
<groupId>com.baeldung.core-java-modules</groupId>
<artifactId>core-java-modules</artifactId>
<version>0.0.1-SNAPSHOT</version>
<relativePath>../../parent-java</relativePath>
<relativePath>../</relativePath>
</parent>
<build>

2
core-java-modules/core-java-arrays-convert/pom.xml
View File

@ -5,7 +5,7 @@
<parent>
<artifactId>core-java-modules</artifactId>
<groupId>com.baeldung.core-java-modules</groupId>
<version>1.0.0-SNAPSHOT</version>
<version>0.0.1-SNAPSHOT</version>
</parent>
<modelVersion>4.0.0</modelVersion>

2
core-java-modules/core-java-arrays-guides/pom.xml
View File

@ -5,7 +5,7 @@
<parent>
<artifactId>core-java-modules</artifactId>
<groupId>com.baeldung.core-java-modules</groupId>
<version>1.0.0-SNAPSHOT</version>
<version>0.0.1-SNAPSHOT</version>
</parent>
<modelVersion>4.0.0</modelVersion>

2
core-java-modules/core-java-arrays-multidimensional/pom.xml
View File

@ -5,7 +5,7 @@
<parent>
<artifactId>core-java-modules</artifactId>
<groupId>com.baeldung.core-java-modules</groupId>
<version>1.0.0-SNAPSHOT</version>
<version>0.0.1-SNAPSHOT</version>
</parent>
<modelVersion>4.0.0</modelVersion>

2
core-java-modules/core-java-arrays-operations-advanced/pom.xml
View File

@ -5,7 +5,7 @@
<parent>
<artifactId>core-java-modules</artifactId>
<groupId>com.baeldung.core-java-modules</groupId>
<version>1.0.0-SNAPSHOT</version>
<version>0.0.1-SNAPSHOT</version>
</parent>
<modelVersion>4.0.0</modelVersion>

2
core-java-modules/core-java-arrays-operations-basic/pom.xml
View File

@ -5,7 +5,7 @@
<parent>
<artifactId>core-java-modules</artifactId>
<groupId>com.baeldung.core-java-modules</groupId>
<version>1.0.0-SNAPSHOT</version>
<version>0.0.1-SNAPSHOT</version>
</parent>
<modelVersion>4.0.0</modelVersion>

4
core-java-modules/core-java-arrays-sorting/pom.xml
View File

@ -5,8 +5,8 @@
<parent>
<artifactId>core-java-modules</artifactId>
<groupId>com.baeldung.core-java-modules</groupId>
<version>1.0.0-SNAPSHOT</version>
<relativePath>../pom.xml</relativePath>
<version>0.0.1-SNAPSHOT</version>
<relativePath>../</relativePath>
</parent>
<modelVersion>4.0.0</modelVersion>

7
core-java-modules/core-java-collections-2/pom.xml
View File

@ -7,12 +7,11 @@
<artifactId>core-java-collections-2</artifactId>
<name>core-java-collections-2</name>
<packaging>jar</packaging>
<parent>
<groupId>com.baeldung</groupId>
<artifactId>parent-java</artifactId>
<groupId>com.baeldung.core-java-modules</groupId>
<artifactId>core-java-modules</artifactId>
<version>0.0.1-SNAPSHOT</version>
<relativePath>../../parent-java</relativePath>
<relativePath>../</relativePath>
</parent>
<dependencies>

7
core-java-modules/core-java-collections-3/pom.xml
View File

@ -8,12 +8,11 @@
<version>0.1.0-SNAPSHOT</version>
<name>core-java-collections-3</name>
<packaging>jar</packaging>
<parent>
<groupId>com.baeldung</groupId>
<artifactId>parent-java</artifactId>
<groupId>com.baeldung.core-java-modules</groupId>
<artifactId>core-java-modules</artifactId>
<version>0.0.1-SNAPSHOT</version>
<relativePath>../../parent-java</relativePath>
<relativePath>../</relativePath>
</parent>
<dependencies>

7
core-java-modules/core-java-collections-array-list/pom.xml
View File

@ -8,12 +8,11 @@
<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>
<groupId>com.baeldung.core-java-modules</groupId>
<artifactId>core-java-modules</artifactId>
<version>0.0.1-SNAPSHOT</version>
<relativePath>../../parent-java</relativePath>
<relativePath>../</relativePath>
</parent>
<dependencies>

7
core-java-modules/core-java-collections-list-2/pom.xml
View File

@ -8,12 +8,11 @@
<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>
<groupId>com.baeldung.core-java-modules</groupId>
<artifactId>core-java-modules</artifactId>
<version>0.0.1-SNAPSHOT</version>
<relativePath>../../parent-java</relativePath>
<relativePath>../</relativePath>
</parent>
<dependencies>

7
core-java-modules/core-java-collections-list-3/pom.xml
View File

@ -8,12 +8,11 @@
<version>0.1.0-SNAPSHOT</version>
<name>core-java-collections-list-3</name>
<packaging>jar</packaging>
<parent>
<groupId>com.baeldung</groupId>
<artifactId>parent-java</artifactId>
<groupId>com.baeldung.core-java-modules</groupId>
<artifactId>core-java-modules</artifactId>
<version>0.0.1-SNAPSHOT</version>
<relativePath>../../parent-java</relativePath>
<relativePath>../</relativePath>
</parent>
<dependencies>

7
core-java-modules/core-java-collections-list/pom.xml
View File

@ -8,12 +8,11 @@
<version>0.1.0-SNAPSHOT</version>
<name>core-java-collections-list</name>
<packaging>jar</packaging>
<parent>
<groupId>com.baeldung</groupId>
<artifactId>parent-java</artifactId>
<groupId>com.baeldung.core-java-modules</groupId>
<artifactId>core-java-modules</artifactId>
<version>0.0.1-SNAPSHOT</version>
<relativePath>../../parent-java</relativePath>
<relativePath>../</relativePath>
</parent>
<dependencies>

7
core-java-modules/core-java-collections-maps-2/pom.xml
View File

@ -7,12 +7,11 @@
<version>0.1.0-SNAPSHOT</version>
<name>core-java-collections-maps-2</name>
<packaging>jar</packaging>
<parent>
<groupId>com.baeldung</groupId>
<artifactId>parent-java</artifactId>
<groupId>com.baeldung.core-java-modules</groupId>
<artifactId>core-java-modules</artifactId>
<version>0.0.1-SNAPSHOT</version>
<relativePath>../../parent-java</relativePath>
<relativePath>../</relativePath>
</parent>
<dependencies>

7
core-java-modules/core-java-collections-maps-3/pom.xml
View File

@ -7,12 +7,11 @@
<version>0.1.0-SNAPSHOT</version>
<name>core-java-collections-maps-3</name>
<packaging>jar</packaging>
<parent>
<groupId>com.baeldung</groupId>
<artifactId>parent-java</artifactId>
<groupId>com.baeldung.core-java-modules</groupId>
<artifactId>core-java-modules</artifactId>
<version>0.0.1-SNAPSHOT</version>
<relativePath>../../parent-java</relativePath>
<relativePath>../</relativePath>
</parent>
<dependencies>

7
core-java-modules/core-java-collections-maps/pom.xml
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@ -6,12 +6,11 @@
<version>0.1.0-SNAPSHOT</version>
<name>core-java-collections-maps</name>
<packaging>jar</packaging>
<parent>
<groupId>com.baeldung</groupId>
<artifactId>parent-java</artifactId>
<groupId>com.baeldung.core-java-modules</groupId>
<artifactId>core-java-modules</artifactId>
<version>0.0.1-SNAPSHOT</version>
<relativePath>../../parent-java</relativePath>
<relativePath>../</relativePath>
</parent>
<dependencies>

7
core-java-modules/core-java-collections-set/pom.xml
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@ -8,12 +8,11 @@
<version>0.1.0-SNAPSHOT</version>
<name>core-java-collections-set</name>
<packaging>jar</packaging>
<parent>
<groupId>com.baeldung</groupId>
<artifactId>parent-java</artifactId>
<groupId>com.baeldung.core-java-modules</groupId>
<artifactId>core-java-modules</artifactId>
<version>0.0.1-SNAPSHOT</version>
<relativePath>../../parent-java</relativePath>
<relativePath>../</relativePath>
</parent>
<dependencies>

7
core-java-modules/core-java-collections/pom.xml
View File

@ -8,12 +8,11 @@
<version>0.1.0-SNAPSHOT</version>
<name>core-java-collections</name>
<packaging>jar</packaging>
<parent>
<groupId>com.baeldung</groupId>
<artifactId>parent-java</artifactId>
<groupId>com.baeldung.core-java-modules</groupId>
<artifactId>core-java-modules</artifactId>
<version>0.0.1-SNAPSHOT</version>
<relativePath>../../parent-java</relativePath>
<relativePath>../</relativePath>
</parent>
<dependencies>

7
core-java-modules/core-java-concurrency-2/pom.xml
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@ -8,12 +8,11 @@
<version>0.1.0-SNAPSHOT</version>
<name>core-java-concurrency-2</name>
<packaging>jar</packaging>
<parent>
<groupId>com.baeldung</groupId>
<artifactId>parent-java</artifactId>
<groupId>com.baeldung.core-java-modules</groupId>
<artifactId>core-java-modules</artifactId>
<version>0.0.1-SNAPSHOT</version>
<relativePath>../../parent-java</relativePath>
<relativePath>../</relativePath>
</parent>
<dependencies>

7
core-java-modules/core-java-concurrency-advanced-2/pom.xml
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@ -8,12 +8,11 @@
<version>0.1.0-SNAPSHOT</version>
<name>core-java-concurrency-advanced-2</name>
<packaging>jar</packaging>
<parent>
<groupId>com.baeldung</groupId>
<artifactId>parent-java</artifactId>
<groupId>com.baeldung.core-java-modules</groupId>
<artifactId>core-java-modules</artifactId>
<version>0.0.1-SNAPSHOT</version>
<relativePath>../../parent-java</relativePath>
<relativePath>../</relativePath>
</parent>
<dependencies>

2
core-java-modules/core-java-concurrency-advanced-3/README.md
View File

@ -11,4 +11,6 @@ This module contains articles about advanced topics about multithreading with co
- [Guide to Work Stealing in Java](https://www.baeldung.com/java-work-stealing)
- [Asynchronous Programming in Java](https://www.baeldung.com/java-asynchronous-programming)
- [Java Thread Deadlock and Livelock](https://www.baeldung.com/java-deadlock-livelock)
- [Guide to AtomicStampedReference in Java](https://www.baeldung.com/java-atomicstampedreference)
- [The ABA Problem in Concurrency](https://www.baeldung.com/cs/aba-concurrency)
- [[<-- previous]](/core-java-modules/core-java-concurrency-advanced-2)

7
core-java-modules/core-java-concurrency-advanced-3/pom.xml
View File

@ -9,12 +9,11 @@
<version>0.1.0-SNAPSHOT</version>
<name>core-java-concurrency-advanced-3</name>
<packaging>jar</packaging>
<parent>
<groupId>com.baeldung</groupId>
<artifactId>parent-java</artifactId>
<groupId>com.baeldung.core-java-modules</groupId>
<artifactId>core-java-modules</artifactId>
<version>0.0.1-SNAPSHOT</version>
<relativePath>../../parent-java</relativePath>
<relativePath>../</relativePath>
</parent>
<dependencies>

83
core-java-modules/core-java-concurrency-advanced-3/src/test/java/com/baeldung/exchanger/ExchangerPipeLineManualTest.java Normal file
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@ -0,0 +1,83 @@
package com.baeldung.exchanger;
import java.util.Queue;
import java.util.UUID;
import java.util.concurrent.CompletableFuture;
import java.util.concurrent.ConcurrentLinkedQueue;
import java.util.concurrent.Exchanger;
import java.util.concurrent.ExecutionException;
import org.junit.Test;
import static java.util.concurrent.CompletableFuture.runAsync;
public class ExchangerPipeLineManualTest {
private static final int BUFFER_SIZE = 100;
@Test
public void givenData_whenPassedThrough_thenCorrect() throws InterruptedException, ExecutionException {
Exchanger<Queue<String>> readerExchanger = new Exchanger<>();
Exchanger<Queue<String>> writerExchanger = new Exchanger<>();
int counter = 0;
Runnable reader = () -> {
Queue<String> readerBuffer = new ConcurrentLinkedQueue<>();
while (true) {
readerBuffer.add(UUID.randomUUID().toString());
if (readerBuffer.size() >= BUFFER_SIZE) {
try {
readerBuffer = readerExchanger.exchange(readerBuffer);
} catch (InterruptedException e) {
Thread.currentThread().interrupt();
throw new RuntimeException(e);
}
}
}
};
Runnable processor = () -> {
Queue<String> processorBuffer = new ConcurrentLinkedQueue<>();
Queue<String> writerBuffer = new ConcurrentLinkedQueue<>();
try {
processorBuffer = readerExchanger.exchange(processorBuffer);
while (true) {
writerBuffer.add(processorBuffer.poll());
if (processorBuffer.isEmpty()) {
try {
processorBuffer = readerExchanger.exchange(processorBuffer);
writerBuffer = writerExchanger.exchange(writerBuffer);
} catch (InterruptedException e) {
Thread.currentThread().interrupt();
throw new RuntimeException(e);
}
}
}
} catch (InterruptedException e) {
Thread.currentThread().interrupt();
throw new RuntimeException(e);
}
};
Runnable writer = () -> {
Queue<String> writerBuffer = new ConcurrentLinkedQueue<>();
try {
writerBuffer = writerExchanger.exchange(writerBuffer);
while (true) {
System.out.println(writerBuffer.poll());
if (writerBuffer.isEmpty()) {
writerBuffer = writerExchanger.exchange(writerBuffer);
}
}
} catch (InterruptedException e) {
Thread.currentThread().interrupt();
throw new RuntimeException(e);
}
};
CompletableFuture.allOf(runAsync(reader), runAsync(processor), runAsync(writer)).get();
}
}

63
core-java-modules/core-java-concurrency-advanced-3/src/test/java/com/baeldung/exchanger/ExchangerUnitTest.java Normal file
View File

@ -0,0 +1,63 @@
package com.baeldung.exchanger;
import static org.junit.Assert.assertEquals;
import java.util.concurrent.CompletableFuture;
import java.util.concurrent.Exchanger;
import java.util.concurrent.ExecutionException;
import org.junit.Test;
import static java.util.concurrent.CompletableFuture.runAsync;
public class ExchangerUnitTest {
@Test
public void givenThreads_whenMessageExchanged_thenCorrect() {
Exchanger<String> exchanger = new Exchanger<>();
Runnable taskA = () -> {
try {
String message = exchanger.exchange("from A");
assertEquals("from B", message);
} catch (InterruptedException e) {
Thread.currentThread().interrupt();
throw new RuntimeException(e);
}
};
Runnable taskB = () -> {
try {
String message = exchanger.exchange("from B");
assertEquals("from A", message);
} catch (InterruptedException e) {
Thread.currentThread().interrupt();
throw new RuntimeException(e);
}
};
CompletableFuture.allOf(runAsync(taskA), runAsync(taskB)).join();
}
@Test
public void givenThread_WhenExchangedMessage_thenCorrect() throws InterruptedException, ExecutionException {
Exchanger<String> exchanger = new Exchanger<>();
Runnable runner = () -> {
try {
String message = exchanger.exchange("from runner");
assertEquals("to runner", message);
} catch (InterruptedException e) {
Thread.currentThread().interrupt();
throw new RuntimeException(e);
}
};
CompletableFuture<Void> result = CompletableFuture.runAsync(runner);
String msg = exchanger.exchange("to runner");
assertEquals("from runner", msg);
result.join();
}
}

7
core-java-modules/core-java-concurrency-advanced/pom.xml
View File

@ -8,12 +8,11 @@
<version>0.1.0-SNAPSHOT</version>
<name>core-java-concurrency-advanced</name>
<packaging>jar</packaging>
<parent>
<groupId>com.baeldung</groupId>
<artifactId>parent-java</artifactId>
<groupId>com.baeldung.core-java-modules</groupId>
<artifactId>core-java-modules</artifactId>
<version>0.0.1-SNAPSHOT</version>
<relativePath>../../parent-java</relativePath>
<relativePath>../</relativePath>
</parent>
<dependencies>

7
core-java-modules/core-java-concurrency-basic-2/pom.xml
View File

@ -8,12 +8,11 @@
<version>0.1.0-SNAPSHOT</version>
<name>core-java-concurrency-basic-2</name>
<packaging>jar</packaging>
<parent>
<groupId>com.baeldung</groupId>
<artifactId>parent-java</artifactId>
<groupId>com.baeldung.core-java-modules</groupId>
<artifactId>core-java-modules</artifactId>
<version>0.0.1-SNAPSHOT</version>
<relativePath>../../parent-java</relativePath>
<relativePath>../</relativePath>
</parent>
<build>

7
core-java-modules/core-java-concurrency-basic/pom.xml
View File

@ -8,12 +8,11 @@
<version>0.1.0-SNAPSHOT</version>
<name>core-java-concurrency-basic</name>
<packaging>jar</packaging>
<parent>
<groupId>com.baeldung</groupId>
<artifactId>parent-java</artifactId>
<groupId>com.baeldung.core-java-modules</groupId>
<artifactId>core-java-modules</artifactId>
<version>0.0.1-SNAPSHOT</version>
<relativePath>../../parent-java</relativePath>
<relativePath>../</relativePath>
</parent>
<dependencies>

9
core-java-modules/core-java-concurrency-collections-2/pom.xml
View File

@ -23,7 +23,12 @@
<artifactId>jmh-generator-annprocess</artifactId>
<version>${jmh.version}</version>
</dependency>
<dependency>
<groupId>org.assertj</groupId>
<artifactId>assertj-core</artifactId>
<version>${assertj.version}</version>
<scope>test</scope>
</dependency>
</dependencies>
<build>
<sourceDirectory>src</sourceDirectory>
@ -42,6 +47,8 @@
<properties>
<jmh.version>1.21</jmh.version>
<guava.version>28.2-jre</guava.version>
<!-- testing -->
<assertj.version>3.6.1</assertj.version>
</properties>
</project>

66
core-java-modules/core-java-concurrency-collections-2/src/test/java/com/baeldung/concurrent/queue/TestConcurrentLinkedQueue.java Normal file
View File

@ -0,0 +1,66 @@
package com.baeldung.concurrent.queue;
import static org.assertj.core.api.Assertions.assertThat;
import static org.hamcrest.CoreMatchers.equalTo;
import static org.hamcrest.CoreMatchers.is;
import static org.junit.Assert.assertNull;
import static org.junit.Assert.assertThat;
import java.util.Arrays;
import java.util.Collection;
import java.util.concurrent.Callable;
import java.util.concurrent.ConcurrentLinkedQueue;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.Future;
import java.util.concurrent.TimeUnit;
import org.junit.FixMethodOrder;
import org.junit.Test;
@FixMethodOrder
public class TestConcurrentLinkedQueue {
@Test
public void givenThereIsExistingCollection_WhenAddedIntoQueue_ThenShouldContainElements() {
Collection<Integer> elements = Arrays.asList(1, 2, 3, 4, 5);
ConcurrentLinkedQueue<Integer> concurrentLinkedQueue = new ConcurrentLinkedQueue<>(elements);
assertThat(concurrentLinkedQueue).containsExactly(1, 2, 3, 4, 5);
}
@Test
public void givenQueueIsEmpty_WhenAccessingTheQueue_ThenQueueReturnsNull() throws InterruptedException {
ExecutorService executorService = Executors.newFixedThreadPool(1);
ConcurrentLinkedQueue<Integer> concurrentLinkedQueue = new ConcurrentLinkedQueue<>();
executorService.submit(() -> assertNull("Retrieve object is null", concurrentLinkedQueue.poll()));
TimeUnit.SECONDS.sleep(1);
executorService.awaitTermination(1, TimeUnit.SECONDS);
executorService.shutdown();
}
@Test
public void givenProducerOffersElementInQueue_WhenConsumerPollsQueue_ThenItRetrievesElement() throws Exception {
int element = 1;
ExecutorService executorService = Executors.newFixedThreadPool(2);
ConcurrentLinkedQueue<Integer> concurrentLinkedQueue = new ConcurrentLinkedQueue<>();
Runnable offerTask = () -> concurrentLinkedQueue.offer(element);
Callable<Integer> pollTask = () -> {
while (concurrentLinkedQueue.peek() != null) {
return concurrentLinkedQueue.poll()
.intValue();
}
return null;
};
executorService.submit(offerTask);
TimeUnit.SECONDS.sleep(1);
Future<Integer> returnedElement = executorService.submit(pollTask);
assertThat(returnedElement.get()
.intValue(), is(equalTo(element)));
executorService.awaitTermination(1, TimeUnit.SECONDS);
executorService.shutdown();
}
}

81
core-java-modules/core-java-concurrency-collections-2/src/test/java/com/baeldung/concurrent/queue/TestLinkedBlockingQueue.java Normal file
View File

@ -0,0 +1,81 @@
package com.baeldung.concurrent.queue;
import static org.assertj.core.api.Assertions.assertThat;
import static org.hamcrest.CoreMatchers.equalTo;
import static org.hamcrest.CoreMatchers.is;
import static org.junit.Assert.assertThat;
import java.util.Arrays;
import java.util.Collection;
import java.util.concurrent.Callable;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.Future;
import java.util.concurrent.LinkedBlockingQueue;
import java.util.concurrent.TimeUnit;
import org.junit.FixMethodOrder;
import org.junit.Test;
@FixMethodOrder
public class TestLinkedBlockingQueue {
@Test
public void givenThereIsExistingCollection_WhenAddedIntoQueue_ThenShouldContainElements() {
Collection<Integer> elements = Arrays.asList(1, 2, 3, 4, 5);
LinkedBlockingQueue<Integer> linkedBlockingQueue = new LinkedBlockingQueue<>(elements);
assertThat(linkedBlockingQueue).containsExactly(1, 2, 3, 4, 5);
}
@Test
public void givenQueueIsEmpty_WhenAccessingTheQueue_ThenThreadBlocks() throws InterruptedException {
ExecutorService executorService = Executors.newFixedThreadPool(1);
LinkedBlockingQueue<Integer> linkedBlockingQueue = new LinkedBlockingQueue<>();
executorService.submit(() -> {
try {
linkedBlockingQueue.take();
} catch (InterruptedException e) {
e.printStackTrace();
}
});
TimeUnit.SECONDS.sleep(1);
executorService.awaitTermination(1, TimeUnit.SECONDS);
executorService.shutdown();
}
@Test
public void givenProducerPutsElementInQueue_WhenConsumerAccessQueue_ThenItRetrieve() {
int element = 10;
ExecutorService executorService = Executors.newFixedThreadPool(2);
LinkedBlockingQueue<Integer> linkedBlockingQueue = new LinkedBlockingQueue<>();
Runnable putTask = () -> {
try {
linkedBlockingQueue.put(element);
} catch (InterruptedException e) {
e.printStackTrace();
}
};
Callable<Integer> takeTask = () -> {
try {
return linkedBlockingQueue.take();
} catch (InterruptedException e) {
e.printStackTrace();
}
return null;
};
executorService.submit(putTask);
Future<Integer> returnElement = executorService.submit(takeTask);
try {
TimeUnit.SECONDS.sleep(1);
assertThat(returnElement.get()
.intValue(), is(equalTo(element)));
executorService.awaitTermination(1, TimeUnit.SECONDS);
} catch (Exception e) {
e.printStackTrace();
}
executorService.shutdown();
}
}

7
core-java-modules/core-java-concurrency-collections/pom.xml
View File

@ -8,12 +8,11 @@
<version>0.1.0-SNAPSHOT</version>
<name>core-java-concurrency-collections</name>
<packaging>jar</packaging>
<parent>
<groupId>com.baeldung</groupId>
<artifactId>parent-java</artifactId>
<groupId>com.baeldung.core-java-modules</groupId>
<artifactId>core-java-modules</artifactId>
<version>0.0.1-SNAPSHOT</version>
<relativePath>../../parent-java</relativePath>
<relativePath>../</relativePath>
</parent>
<dependencies>

7
core-java-modules/core-java-date-operations-1/pom.xml
View File

@ -8,12 +8,11 @@
<version>${project.parent.version}</version>
<name>core-java-date-operations-1</name>
<packaging>jar</packaging>
<parent>
<groupId>com.baeldung</groupId>
<artifactId>parent-java</artifactId>
<groupId>com.baeldung.core-java-modules</groupId>
<artifactId>core-java-modules</artifactId>
<version>0.0.1-SNAPSHOT</version>
<relativePath>../../parent-java</relativePath>
<relativePath>../</relativePath>
</parent>
<dependencies>

7
core-java-modules/core-java-date-operations-2/pom.xml
View File

@ -8,12 +8,11 @@
<version>${project.parent.version}</version>
<name>core-java-date-operations-2</name>
<packaging>jar</packaging>
<parent>
<groupId>com.baeldung</groupId>
<artifactId>parent-java</artifactId>
<groupId>com.baeldung.core-java-modules</groupId>
<artifactId>core-java-modules</artifactId>
<version>0.0.1-SNAPSHOT</version>
<relativePath>../../parent-java</relativePath>
<relativePath>../</relativePath>
</parent>
<dependencies>

7
core-java-modules/core-java-datetime-conversion/pom.xml
View File

@ -8,12 +8,11 @@
<version>${project.parent.version}</version>
<name>core-java-datetime-conversion</name>
<packaging>jar</packaging>
<parent>
<groupId>com.baeldung</groupId>
<artifactId>parent-java</artifactId>
<groupId>com.baeldung.core-java-modules</groupId>
<artifactId>core-java-modules</artifactId>
<version>0.0.1-SNAPSHOT</version>
<relativePath>../../parent-java</relativePath>
<relativePath>../</relativePath>
</parent>
<dependencies>

7
core-java-modules/core-java-datetime-string/pom.xml
View File

@ -8,12 +8,11 @@
<version>${project.parent.version}</version>
<name>core-java-datetime-string</name>
<packaging>jar</packaging>
<parent>
<groupId>com.baeldung</groupId>
<artifactId>parent-java</artifactId>
<groupId>com.baeldung.core-java-modules</groupId>
<artifactId>core-java-modules</artifactId>
<version>0.0.1-SNAPSHOT</version>
<relativePath>../../parent-java</relativePath>
<relativePath>../</relativePath>
</parent>
<dependencies>

3
core-java-modules/core-java-exceptions-2/README.md
View File

@ -9,3 +9,6 @@ This module contains articles about core java exceptions
- [java.net.UnknownHostException: Invalid Hostname for Server](https://www.baeldung.com/java-unknownhostexception)
- [How to Handle Java SocketException](https://www.baeldung.com/java-socketexception)
- [Java Suppressed Exceptions](https://www.baeldung.com/java-suppressed-exceptions)
- [Java – Try with Resources](https://www.baeldung.com/java-try-with-resources)
- [Java Global Exception Handler](https://www.baeldung.com/java-global-exception-handler)
- [How to Find an Exception’s Root Cause in Java](https://www.baeldung.com/java-exception-root-cause)

13
core-java-modules/core-java-exceptions-2/pom.xml
View File

@ -7,12 +7,11 @@
<artifactId>core-java-exceptions-2</artifactId>
<name>core-java-exceptions-2</name>
<packaging>jar</packaging>
<parent>
<groupId>com.baeldung</groupId>
<artifactId>parent-java</artifactId>
<groupId>com.baeldung.core-java-modules</groupId>
<artifactId>core-java-modules</artifactId>
<version>0.0.1-SNAPSHOT</version>
<relativePath>../../parent-java</relativePath>
<relativePath>../</relativePath>
</parent>
<dependencies>
@ -23,6 +22,11 @@
<version>${assertj-core.version}</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.apache.commons</groupId>
<artifactId>commons-lang3</artifactId>
<version>${commons.lang3.version}</version>
</dependency>
</dependencies>
<description> </description>
@ -30,6 +34,7 @@
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<commons.lang3.version>3.10</commons.lang3.version>
<!-- testing -->
<assertj-core.version>3.10.0</assertj-core.version>
</properties>

2
core-java-modules/core-java-exceptions/src/main/java/com/baeldung/exceptions/globalexceptionhandler/Arithmetic.java → core-java-modules/core-java-exceptions-2/src/main/java/com/baeldung/globalexceptionhandler/Arithmetic.java
View File

@ -1,4 +1,4 @@
package com.baeldung.exceptions.globalexceptionhandler;
package com.baeldung.globalexceptionhandler;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

2
core-java-modules/core-java-exceptions/src/main/java/com/baeldung/exceptions/globalexceptionhandler/ArrayIndexOutOfBounds.java → core-java-modules/core-java-exceptions-2/src/main/java/com/baeldung/globalexceptionhandler/ArrayIndexOutOfBounds.java
View File

@ -1,4 +1,4 @@
package com.baeldung.exceptions.globalexceptionhandler;
package com.baeldung.globalexceptionhandler;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

2
core-java-modules/core-java-exceptions/src/main/java/com/baeldung/exceptions/globalexceptionhandler/ClassCast.java → core-java-modules/core-java-exceptions-2/src/main/java/com/baeldung/globalexceptionhandler/ClassCast.java
View File

@ -1,4 +1,4 @@
package com.baeldung.exceptions.globalexceptionhandler;
package com.baeldung.globalexceptionhandler;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

2
core-java-modules/core-java-exceptions/src/main/java/com/baeldung/exceptions/globalexceptionhandler/FileNotFound.java → core-java-modules/core-java-exceptions-2/src/main/java/com/baeldung/globalexceptionhandler/FileNotFound.java
View File

@ -1,4 +1,4 @@
package com.baeldung.exceptions.globalexceptionhandler;
package com.baeldung.globalexceptionhandler;
import java.io.BufferedReader;
import java.io.File;

2
core-java-modules/core-java-exceptions/src/main/java/com/baeldung/exceptions/globalexceptionhandler/GlobalExceptionHandler.java → core-java-modules/core-java-exceptions-2/src/main/java/com/baeldung/globalexceptionhandler/GlobalExceptionHandler.java
View File

@ -1,4 +1,4 @@
package com.baeldung.exceptions.globalexceptionhandler;
package com.baeldung.globalexceptionhandler;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

2
core-java-modules/core-java-exceptions/src/main/java/com/baeldung/exceptions/globalexceptionhandler/IllegalArgument.java → core-java-modules/core-java-exceptions-2/src/main/java/com/baeldung/globalexceptionhandler/IllegalArgument.java
View File

@ -1,4 +1,4 @@
package com.baeldung.exceptions.globalexceptionhandler;
package com.baeldung.globalexceptionhandler;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

2
core-java-modules/core-java-exceptions/src/main/java/com/baeldung/exceptions/globalexceptionhandler/IllegalState.java → core-java-modules/core-java-exceptions-2/src/main/java/com/baeldung/globalexceptionhandler/IllegalState.java
View File

@ -1,4 +1,4 @@
package com.baeldung.exceptions.globalexceptionhandler;
package com.baeldung.globalexceptionhandler;
import java.util.ArrayList;
import java.util.Iterator;

2
core-java-modules/core-java-exceptions/src/main/java/com/baeldung/exceptions/globalexceptionhandler/InterruptedExceptionExample.java → core-java-modules/core-java-exceptions-2/src/main/java/com/baeldung/globalexceptionhandler/InterruptedExceptionExample.java
View File

@ -1,4 +1,4 @@
package com.baeldung.exceptions.globalexceptionhandler;
package com.baeldung.globalexceptionhandler;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

2
core-java-modules/core-java-exceptions/src/main/java/com/baeldung/exceptions/globalexceptionhandler/MalformedURL.java → core-java-modules/core-java-exceptions-2/src/main/java/com/baeldung/globalexceptionhandler/MalformedURL.java
View File

@ -1,4 +1,4 @@
package com.baeldung.exceptions.globalexceptionhandler;
package com.baeldung.globalexceptionhandler;
import java.net.MalformedURLException;
import java.net.URL;

2
core-java-modules/core-java-exceptions/src/main/java/com/baeldung/exceptions/globalexceptionhandler/NullPointer.java → core-java-modules/core-java-exceptions-2/src/main/java/com/baeldung/globalexceptionhandler/NullPointer.java
View File

@ -1,4 +1,4 @@
package com.baeldung.exceptions.globalexceptionhandler;
package com.baeldung.globalexceptionhandler;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

2
core-java-modules/core-java-exceptions/src/main/java/com/baeldung/exceptions/globalexceptionhandler/NumberFormat.java → core-java-modules/core-java-exceptions-2/src/main/java/com/baeldung/globalexceptionhandler/NumberFormat.java
View File

@ -1,4 +1,4 @@
package com.baeldung.exceptions.globalexceptionhandler;
package com.baeldung.globalexceptionhandler;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

2
core-java-modules/core-java-exceptions/src/main/java/com/baeldung/exceptions/globalexceptionhandler/ParseExceptionExample.java → core-java-modules/core-java-exceptions-2/src/main/java/com/baeldung/globalexceptionhandler/ParseExceptionExample.java
View File

@ -1,4 +1,4 @@
package com.baeldung.exceptions.globalexceptionhandler;
package com.baeldung.globalexceptionhandler;
import java.text.DateFormat;
import java.text.ParseException;

2
core-java-modules/core-java-exceptions/src/main/java/com/baeldung/exceptions/globalexceptionhandler/StringIndexOutOfBounds.java → core-java-modules/core-java-exceptions-2/src/main/java/com/baeldung/globalexceptionhandler/StringIndexOutOfBounds.java
View File

@ -1,4 +1,4 @@
package com.baeldung.exceptions.globalexceptionhandler;
package com.baeldung.globalexceptionhandler;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

2
core-java-modules/core-java-exceptions/src/main/java/com/baeldung/exceptions/rootcausefinder/RootCauseFinder.java → core-java-modules/core-java-exceptions-2/src/main/java/com/baeldung/rootcausefinder/RootCauseFinder.java
View File

@ -1,4 +1,4 @@
package com.baeldung.exceptions.rootcausefinder;
package com.baeldung.rootcausefinder;
import java.time.LocalDate;
import java.time.Period;

0
core-java-modules/core-java-exceptions/src/main/java/com/baeldung/trywithresource/AutoCloseableMain.java → core-java-modules/core-java-exceptions-2/src/main/java/com/baeldung/trywithresource/AutoCloseableMain.java
View File

0
core-java-modules/core-java-exceptions/src/main/java/com/baeldung/trywithresource/AutoCloseableResourcesFirst.java → core-java-modules/core-java-exceptions-2/src/main/java/com/baeldung/trywithresource/AutoCloseableResourcesFirst.java
View File

0
core-java-modules/core-java-exceptions/src/main/java/com/baeldung/trywithresource/AutoCloseableResourcesSecond.java → core-java-modules/core-java-exceptions-2/src/main/java/com/baeldung/trywithresource/AutoCloseableResourcesSecond.java
View File

0
core-java-modules/core-java-exceptions/src/main/java/com/baeldung/trywithresource/MyResource.java → core-java-modules/core-java-exceptions-2/src/main/java/com/baeldung/trywithresource/MyResource.java
View File

2
core-java-modules/core-java-exceptions/src/test/java/com/baeldung/exceptions/globalexceptionhandler/GlobalExceptionHandlerUnitTest.java → core-java-modules/core-java-exceptions-2/src/test/java/com/baeldung/globalexceptionhandler/GlobalExceptionHandlerUnitTest.java
View File

@ -1,4 +1,4 @@
package com.baeldung.exceptions.globalexceptionhandler;
package com.baeldung.globalexceptionhandler;
import org.junit.After;
import org.junit.Before;

15
core-java-modules/core-java-exceptions/src/test/java/com/baeldung/exceptions/rootcausefinder/RootCauseFinderUnitTest.java → core-java-modules/core-java-exceptions-2/src/test/java/com/baeldung/rootcausefinder/RootCauseFinderUnitTest.java
View File

@ -1,7 +1,7 @@
package com.baeldung.exceptions.rootcausefinder;
package com.baeldung.rootcausefinder;
import com.baeldung.exceptions.rootcausefinder.RootCauseFinder.CalculationException;
import com.baeldung.exceptions.rootcausefinder.RootCauseFinder.DateOutOfRangeException;
import com.baeldung.rootcausefinder.RootCauseFinder.CalculationException;
import com.baeldung.rootcausefinder.RootCauseFinder.DateOutOfRangeException;
import com.google.common.base.Throwables;
import org.apache.commons.lang3.exception.ExceptionUtils;
import org.junit.jupiter.api.Assertions;
@ -11,8 +11,7 @@ import java.time.LocalDate;
import java.time.format.DateTimeParseException;
import java.time.temporal.ChronoUnit;
import static com.baeldung.exceptions.rootcausefinder.RootCauseFinder.AgeCalculator;
import static com.baeldung.exceptions.rootcausefinder.RootCauseFinder.findCauseUsingPlainJava;
import static com.baeldung.rootcausefinder.RootCauseFinder.AgeCalculator;
import static org.junit.jupiter.api.Assertions.assertTrue;
/**
@ -38,7 +37,7 @@ public class RootCauseFinderUnitTest {
try {
AgeCalculator.calculateAge("010102");
} catch (CalculationException ex) {
assertTrue(findCauseUsingPlainJava(ex) instanceof DateTimeParseException);
assertTrue(RootCauseFinder.findCauseUsingPlainJava(ex) instanceof DateTimeParseException);
}
}
@ -47,7 +46,7 @@ public class RootCauseFinderUnitTest {
try {
AgeCalculator.calculateAge("2020-04-04");
} catch (CalculationException ex) {
assertTrue(findCauseUsingPlainJava(ex) instanceof DateOutOfRangeException);
assertTrue(RootCauseFinder.findCauseUsingPlainJava(ex) instanceof DateOutOfRangeException);
}
}
@ -56,7 +55,7 @@ public class RootCauseFinderUnitTest {
try {
AgeCalculator.calculateAge(null);
} catch (Exception ex) {
assertTrue(findCauseUsingPlainJava(ex) instanceof IllegalArgumentException);
assertTrue(RootCauseFinder.findCauseUsingPlainJava(ex) instanceof IllegalArgumentException);
}
}

4
core-java-modules/core-java-exceptions/README.md
View File

@ -12,9 +12,5 @@ This module contains articles about core java exceptions
- [“Sneaky Throws” in Java](https://www.baeldung.com/java-sneaky-throws)
- [The StackOverflowError in Java](https://www.baeldung.com/java-stack-overflow-error)
- [Checked and Unchecked Exceptions in Java](https://www.baeldung.com/java-checked-unchecked-exceptions)
- [Java – Try with Resources](https://www.baeldung.com/java-try-with-resources)
- [Java Global Exception Handler](https://www.baeldung.com/java-global-exception-handler)
- [Common Java Exceptions](https://www.baeldung.com/java-common-exceptions)
- [How to Find an Exception’s Root Cause in Java](https://www.baeldung.com/java-exception-root-cause)
- [Is It a Bad Practice to Catch Throwable?](https://www.baeldung.com/java-catch-throwable-bad-practice)
- [[Next -->]](/core-java-modules/core-java-exceptions-2)

7
core-java-modules/core-java-exceptions/pom.xml
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@ -9,12 +9,11 @@
<version>0.1.0-SNAPSHOT</version>
<name>core-java-exceptions</name>
<packaging>jar</packaging>
<parent>
<groupId>com.baeldung</groupId>
<artifactId>parent-java</artifactId>
<groupId>com.baeldung.core-java-modules</groupId>
<artifactId>core-java-modules</artifactId>
<version>0.0.1-SNAPSHOT</version>
<relativePath>../../parent-java</relativePath>
<relativePath>../</relativePath>
</parent>
<dependencies>

7
core-java-modules/core-java-function/pom.xml
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@ -8,12 +8,11 @@
<version>0.1.0-SNAPSHOT</version>
<name>core-java-function</name>
<packaging>jar</packaging>
<parent>
<groupId>com.baeldung</groupId>
<artifactId>parent-java</artifactId>
<groupId>com.baeldung.core-java-modules</groupId>
<artifactId>core-java-modules</artifactId>
<version>0.0.1-SNAPSHOT</version>
<relativePath>../../parent-java</relativePath>
<relativePath>../</relativePath>
</parent>
<dependencies>

7
core-java-modules/core-java-io-2/pom.xml
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@ -8,12 +8,11 @@
<version>0.1.0-SNAPSHOT</version>
<name>core-java-io-2</name>
<packaging>jar</packaging>
<parent>
<groupId>com.baeldung</groupId>
<artifactId>parent-java</artifactId>
<groupId>com.baeldung.core-java-modules</groupId>
<artifactId>core-java-modules</artifactId>
<version>0.0.1-SNAPSHOT</version>
<relativePath>../../parent-java</relativePath>
<relativePath>../</relativePath>
</parent>
<dependencies>

7
core-java-modules/core-java-io-apis/pom.xml
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@ -8,12 +8,11 @@
<version>0.1.0-SNAPSHOT</version>
<name>core-java-io-apis</name>
<packaging>jar</packaging>
<parent>
<groupId>com.baeldung</groupId>
<artifactId>parent-java</artifactId>
<groupId>com.baeldung.core-java-modules</groupId>
<artifactId>core-java-modules</artifactId>
<version>0.0.1-SNAPSHOT</version>
<relativePath>../../parent-java</relativePath>
<relativePath>../</relativePath>
</parent>
<dependencies>

1
core-java-modules/core-java-io-conversions-2/README.md
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@ -4,6 +4,5 @@ This module contains articles about core Java input/output(IO) conversions.
### Relevant Articles:
- [Java InputStream to String](https://www.baeldung.com/convert-input-stream-to-string)
- [Java InputStream to Byte Array and ByteBuffer](https://www.baeldung.com/convert-input-stream-to-array-of-bytes)
- [Java – Write an InputStream to a File](https://www.baeldung.com/convert-input-stream-to-a-file)
- More articles: [[<-- prev]](/core-java-modules/core-java-io-conversions)

7
core-java-modules/core-java-io-conversions-2/pom.xml
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@ -8,12 +8,11 @@
<version>0.1.0-SNAPSHOT</version>
<name>core-java-io-conversions-2</name>
<packaging>jar</packaging>
<parent>
<groupId>com.baeldung</groupId>
<artifactId>parent-java</artifactId>
<groupId>com.baeldung.core-java-modules</groupId>
<artifactId>core-java-modules</artifactId>
<version>0.0.1-SNAPSHOT</version>
<relativePath>../../parent-java</relativePath>
<relativePath>../</relativePath>
</parent>
<dependencies>

64
core-java-modules/core-java-io-conversions-2/src/test/java/com/baeldung/inputstreamtostring/JavaInputStreamToXUnitTest.java
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@ -2,7 +2,6 @@ package com.baeldung.inputstreamtostring;
import com.google.common.base.Charsets;
import com.google.common.io.ByteSource;
import com.google.common.io.ByteStreams;
import com.google.common.io.CharStreams;
import com.google.common.io.Files;
import org.apache.commons.io.FileUtils;
@ -11,13 +10,26 @@ import org.junit.Test;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.io.*;
import java.io.BufferedReader;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.Reader;
import java.io.StringReader;
import java.io.StringWriter;
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 java.util.stream.Collectors;
import static org.apache.commons.lang3.RandomStringUtils.randomAlphabetic;
import static org.hamcrest.Matchers.equalTo;
@ -46,6 +58,18 @@ public class JavaInputStreamToXUnitTest {
assertEquals(textBuilder.toString(), originalString);
}
@Test
public void givenUsingJava8_whenConvertingAnInputStreamToAString_thenCorrect() {
final String originalString = randomAlphabetic(DEFAULT_SIZE);
final InputStream inputStream = new ByteArrayInputStream(originalString.getBytes());
final String text = new BufferedReader(new InputStreamReader(inputStream, Charset.forName(StandardCharsets.UTF_8.name())))
.lines()
.collect(Collectors.joining("\n"));
assertThat(text, equalTo(originalString));
}
@Test
public final void givenUsingJava7_whenConvertingAnInputStreamToAString_thenCorrect() throws IOException {
final String originalString = randomAlphabetic(DEFAULT_SIZE);
@ -127,42 +151,6 @@ public class JavaInputStreamToXUnitTest {
assertThat(result, equalTo(originalString));
}
// tests - InputStream to byte[]
@Test
public final void givenUsingPlainJavaOnFixedSizeStream_whenConvertingAnInputStreamToAByteArray_thenCorrect() throws IOException {
final InputStream initialStream = new ByteArrayInputStream(new byte[] { 0, 1, 2 });
final byte[] targetArray = new byte[initialStream.available()];
initialStream.read(targetArray);
}
@Test
public final void givenUsingPlainJavaOnUnknownSizeStream_whenConvertingAnInputStreamToAByteArray_thenCorrect() throws IOException {
final InputStream is = new ByteArrayInputStream(new byte[] { 0, 1, 2 });
final ByteArrayOutputStream buffer = new ByteArrayOutputStream();
int nRead;
final byte[] data = new byte[1024];
while ((nRead = is.read(data, 0, data.length)) != -1) {
buffer.write(data, 0, nRead);
}
buffer.flush();
final byte[] byteArray = buffer.toByteArray();
}
@Test
public final void givenUsingGuava_whenConvertingAnInputStreamToAByteArray_thenCorrect() throws IOException {
final InputStream initialStream = ByteSource.wrap(new byte[] { 0, 1, 2 }).openStream();
final byte[] targetArray = ByteStreams.toByteArray(initialStream);
}
@Test
public final void givenUsingCommonsIO_whenConvertingAnInputStreamToAByteArray_thenCorrect() throws IOException {
final InputStream initialStream = new ByteArrayInputStream(new byte[] { 0, 1, 2 });
final byte[] targetArray = IOUtils.toByteArray(initialStream);
}
// tests - InputStream to File
@Test

7
core-java-modules/core-java-io-conversions/pom.xml
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@ -8,12 +8,11 @@
<version>0.1.0-SNAPSHOT</version>
<name>core-java-io-conversions</name>
<packaging>jar</packaging>
<parent>
<groupId>com.baeldung</groupId>
<artifactId>parent-java</artifactId>
<groupId>com.baeldung.core-java-modules</groupId>
<artifactId>core-java-modules</artifactId>
<version>0.0.1-SNAPSHOT</version>
<relativePath>../../parent-java</relativePath>
<relativePath>../</relativePath>
</parent>
<dependencies>

7
core-java-modules/core-java-io/pom.xml
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@ -8,12 +8,11 @@
<version>0.1.0-SNAPSHOT</version>
<name>core-java-io</name>
<packaging>jar</packaging>
<parent>
<groupId>com.baeldung</groupId>
<artifactId>parent-java</artifactId>
<groupId>com.baeldung.core-java-modules</groupId>
<artifactId>core-java-modules</artifactId>
<version>0.0.1-SNAPSHOT</version>
<relativePath>../../parent-java</relativePath>
<relativePath>../</relativePath>
</parent>
<dependencies>

7
core-java-modules/core-java-jar/pom.xml
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@ -8,12 +8,11 @@
<version>0.1.0-SNAPSHOT</version>
<name>core-java-jar</name>
<packaging>jar</packaging>
<parent>
<groupId>com.baeldung</groupId>
<artifactId>parent-java</artifactId>
<groupId>com.baeldung.core-java-modules</groupId>
<artifactId>core-java-modules</artifactId>
<version>0.0.1-SNAPSHOT</version>
<relativePath>../../parent-java</relativePath>
<relativePath>../</relativePath>
</parent>
<dependencies>

2
core-java-modules/core-java-jndi/pom.xml
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@ -12,7 +12,7 @@
<parent>
<groupId>com.baeldung.core-java-modules</groupId>
<artifactId>core-java-modules</artifactId>
<version>1.0.0-SNAPSHOT</version>
<version>0.0.1-SNAPSHOT</version>
</parent>
<dependencies>

2
core-java-modules/core-java-jpms/pom.xml
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@ -12,7 +12,7 @@
<parent>
<groupId>com.baeldung.core-java-modules</groupId>
<artifactId>core-java-modules</artifactId>
<version>1.0.0-SNAPSHOT</version>
<version>0.0.1-SNAPSHOT</version>
</parent>
<modules>

8
core-java-modules/core-java-jvm/pom.xml
View File

@ -10,10 +10,10 @@
<packaging>jar</packaging>
<parent>
<groupId>com.baeldung</groupId>
<artifactId>parent-modules</artifactId>
<version>1.0.0-SNAPSHOT</version>
<relativePath>../../</relativePath>
<groupId>com.baeldung.core-java-modules</groupId>
<artifactId>core-java-modules</artifactId>
<version>0.0.1-SNAPSHOT</version>
<relativePath>../</relativePath>
</parent>
<dependencies>

7
core-java-modules/core-java-lambdas/pom.xml
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@ -8,12 +8,11 @@
<version>0.1.0-SNAPSHOT</version>
<name>core-java-lambdas</name>
<packaging>jar</packaging>
<parent>
<groupId>com.baeldung</groupId>
<artifactId>parent-java</artifactId>
<groupId>com.baeldung.core-java-modules</groupId>
<artifactId>core-java-modules</artifactId>
<version>0.0.1-SNAPSHOT</version>
<relativePath>../../parent-java</relativePath>
<relativePath>../</relativePath>
</parent>
<dependencies>

16
core-java-modules/core-java-lang-2/pom.xml
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@ -8,19 +8,23 @@
<version>0.1.0-SNAPSHOT</version>
<name>core-java-lang-2</name>
<packaging>jar</packaging>
<parent>
<groupId>com.baeldung</groupId>
<artifactId>parent-java</artifactId>
<groupId>com.baeldung.core-java-modules</groupId>
<artifactId>core-java-modules</artifactId>
<version>0.0.1-SNAPSHOT</version>
<relativePath>../../parent-java</relativePath>
<relativePath>../</relativePath>
</parent>
<dependencies>
<dependency>
<groupId>org.apache.commons</groupId>
<artifactId>commons-lang3</artifactId>
<version>3.9</version>
<version>${commons-lang3.version}</version>
</dependency>
<dependency>
<groupId>com.google.guava</groupId>
<artifactId>guava</artifactId>
<version>${guava.version}</version>
</dependency>
<dependency>
<groupId>commons-beanutils</groupId>
@ -65,6 +69,8 @@
<jmh-generator.version>1.19</jmh-generator.version>
<assertj.version>3.12.2</assertj.version>
<commons.beanutils.version>1.9.4</commons.beanutils.version>
<commons-lang3.version>3.10</commons-lang3.version>
<guava.version>29.0-jre</guava.version>
</properties>
</project>

51
core-java-modules/core-java-lang-2/src/main/java/com/baeldung/comparing/PersonWithEquals.java Normal file
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@ -0,0 +1,51 @@
package com.baeldung.comparing;
import java.time.LocalDate;
import java.util.Objects;
public class PersonWithEquals {
private String firstName;
private String lastName;
private LocalDate birthDate;
public PersonWithEquals(String firstName, String lastName) {
if (firstName == null || lastName == null) {
throw new NullPointerException("Names can't be null");
}
this.firstName = firstName;
this.lastName = lastName;
}
public PersonWithEquals(String firstName, String lastName, LocalDate birthDate) {
this(firstName, lastName);
this.birthDate = birthDate;
}
public String firstName() {
return firstName;
}
public String lastName() {
return lastName;
}
public LocalDate birthDate() {
return birthDate;
}
@Override
public boolean equals(Object o) {
if (this == o) return true;
if (o == null || getClass() != o.getClass()) return false;
PersonWithEquals that = (PersonWithEquals) o;
return firstName.equals(that.firstName) &&
lastName.equals(that.lastName) &&
Objects.equals(birthDate, that.birthDate);
}
@Override
public int hashCode() {
return Objects.hash(firstName, lastName);
}
}

62
core-java-modules/core-java-lang-2/src/main/java/com/baeldung/comparing/PersonWithEqualsAndComparable.java Normal file
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@ -0,0 +1,62 @@
package com.baeldung.comparing;
import java.time.LocalDate;
import java.util.Objects;
public class PersonWithEqualsAndComparable implements Comparable<PersonWithEqualsAndComparable> {
private String firstName;
private String lastName;
private LocalDate birthDate;
public PersonWithEqualsAndComparable(String firstName, String lastName) {
if (firstName == null || lastName == null) {
throw new NullPointerException("Names can't be null");
}
this.firstName = firstName;
this.lastName = lastName;
}
public PersonWithEqualsAndComparable(String firstName, String lastName, LocalDate birthDate) {
this(firstName, lastName);
this.birthDate = birthDate;
}
@Override
public boolean equals(Object o) {
if (this == o) return true;
if (o == null || getClass() != o.getClass()) return false;
PersonWithEqualsAndComparable that = (PersonWithEqualsAndComparable) o;
return firstName.equals(that.firstName) &&
lastName.equals(that.lastName) &&
Objects.equals(birthDate, that.birthDate);
}
@Override
public int hashCode() {
return Objects.hash(firstName, lastName);
}
@Override
public int compareTo(PersonWithEqualsAndComparable o) {
int lastNamesComparison = this.lastName.compareTo(o.lastName);
if (lastNamesComparison == 0) {
int firstNamesComparison = this.firstName.compareTo(o.firstName);
if (firstNamesComparison == 0) {
if (this.birthDate != null && o.birthDate != null) {
return this.birthDate.compareTo(o.birthDate);
} else if (this.birthDate != null) {
return 1;
} else if (o.birthDate != null) {
return -1;
} else {
return 0;
}
} else {
return firstNamesComparison;
}
} else {
return lastNamesComparison;
}
}
}

60
core-java-modules/core-java-lang-2/src/main/java/com/baeldung/comparing/PersonWithEqualsAndComparableUsingComparator.java Normal file
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@ -0,0 +1,60 @@
package com.baeldung.comparing;
import java.time.LocalDate;
import java.util.Comparator;
import java.util.Objects;
public class PersonWithEqualsAndComparableUsingComparator implements Comparable<PersonWithEqualsAndComparableUsingComparator> {
private String firstName;
private String lastName;
private LocalDate birthDate;
public PersonWithEqualsAndComparableUsingComparator(String firstName, String lastName) {
if (firstName == null || lastName == null) {
throw new NullPointerException("Names can't be null");
}
this.firstName = firstName;
this.lastName = lastName;
}
public PersonWithEqualsAndComparableUsingComparator(String firstName, String lastName, LocalDate birthDate) {
this(firstName, lastName);
this.birthDate = birthDate;
}
public String firstName() {
return firstName;
}
public String lastName() {
return lastName;
}
public LocalDate birthDate() {
return birthDate;
}
@Override
public boolean equals(Object o) {
if (this == o) return true;
if (o == null || getClass() != o.getClass()) return false;
PersonWithEqualsAndComparableUsingComparator that = (PersonWithEqualsAndComparableUsingComparator) o;
return firstName.equals(that.firstName) &&
lastName.equals(that.lastName) &&
Objects.equals(birthDate, that.birthDate);
}
@Override
public int hashCode() {
return Objects.hash(firstName, lastName);
}
@Override
public int compareTo(PersonWithEqualsAndComparableUsingComparator o) {
return Comparator.comparing(PersonWithEqualsAndComparableUsingComparator::lastName)
.thenComparing(PersonWithEqualsAndComparableUsingComparator::firstName)
.thenComparing(PersonWithEqualsAndComparableUsingComparator::birthDate, Comparator.nullsLast(Comparator.naturalOrder()))
.compare(this, o);
}
}

44
core-java-modules/core-java-lang-2/src/main/java/com/baeldung/comparing/PersonWithEqualsAndWrongComparable.java Normal file
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@ -0,0 +1,44 @@
package com.baeldung.comparing;
import java.time.LocalDate;
import java.util.Objects;
public class PersonWithEqualsAndWrongComparable implements Comparable<PersonWithEqualsAndWrongComparable> {
private String firstName;
private String lastName;
private LocalDate birthDate;
public PersonWithEqualsAndWrongComparable(String firstName, String lastName) {
if (firstName == null || lastName == null) {
throw new NullPointerException("Names can't be null");
}
this.firstName = firstName;
this.lastName = lastName;
}
public PersonWithEqualsAndWrongComparable(String firstName, String lastName, LocalDate birthDate) {
this(firstName, lastName);
this.birthDate = birthDate;
}
@Override
public boolean equals(Object o) {
if (this == o) return true;
if (o == null || getClass() != o.getClass()) return false;
PersonWithEqualsAndWrongComparable that = (PersonWithEqualsAndWrongComparable) o;
return firstName.equals(that.firstName) &&
lastName.equals(that.lastName) &&
Objects.equals(birthDate, that.birthDate);
}
@Override
public int hashCode() {
return Objects.hash(firstName, lastName);
}
@Override
public int compareTo(PersonWithEqualsAndWrongComparable o) {
return this.lastName.compareTo(o.lastName);
}
}

11
core-java-modules/core-java-lang-2/src/main/java/com/baeldung/comparing/PersonWithoutEquals.java Normal file
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@ -0,0 +1,11 @@
package com.baeldung.comparing;
public class PersonWithoutEquals {
private String firstName;
private String lastName;
public PersonWithoutEquals(String firstName, String lastName) {
this.firstName = firstName;
this.lastName = lastName;
}
}

59
core-java-modules/core-java-lang-2/src/test/java/com/baeldung/comparing/ApacheCommonsObjectUtilsUnitTest.java Normal file
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@ -0,0 +1,59 @@
package com.baeldung.comparing;
import org.apache.commons.lang3.ObjectUtils;
import org.junit.jupiter.api.Test;
import static org.assertj.core.api.Assertions.assertThat;
class ApacheCommonsObjectUtilsUnitTest {
@Test
void givenTwoStringsWithSameValues_whenApacheCommonsEqualityMethods_thenEqualsTrueNotEqualsFalse() {
String a = new String("Hello!");
String b = new String("Hello!");
assertThat(ObjectUtils.equals(a, b)).isTrue();
assertThat(ObjectUtils.notEqual(a, b)).isFalse();
}
@Test
void givenTwoStringsWithDifferentValues_whenApacheCommonsEqualityMethods_thenEqualsFalseNotEqualsTrue() {
String a = new String("Hello!");
String b = new String("Hello World!");
assertThat(ObjectUtils.equals(a, b)).isFalse();
assertThat(ObjectUtils.notEqual(a, b)).isTrue();
}
@Test
void givenTwoStringsWithConsecutiveValues_whenApacheCommonsCompare_thenNegative() {
String first = new String("Hello!");
String second = new String("How are you?");
assertThat(ObjectUtils.compare(first, second)).isNegative();
}
@Test
void givenTwoStringsWithSameValues_whenApacheCommonsEqualityMethods_thenEqualsFalseNotEqualsTrue() {
String first = new String("Hello!");
String second = new String("Hello!");
assertThat(ObjectUtils.compare(first, second)).isZero();
}
@Test
void givenTwoStringsWithConsecutiveValues_whenApacheCommonsCompareReversed_thenPositive() {
String first = new String("Hello!");
String second = new String("How are you?");
assertThat(ObjectUtils.compare(second, first)).isPositive();
}
@Test
void givenTwoStringsOneNull_whenApacheCommonsCompare_thenPositive() {
String first = new String("Hello!");
String second = null;
assertThat(ObjectUtils.compare(first, second, false)).isPositive();
}
}

107
core-java-modules/core-java-lang-2/src/test/java/com/baeldung/comparing/ComparableInterfaceUnitTest.java Normal file
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@ -0,0 +1,107 @@
package com.baeldung.comparing;
import org.junit.jupiter.api.Test;
import java.util.SortedSet;
import java.util.TreeSet;
import static org.assertj.core.api.Assertions.assertThat;
class ComparableInterfaceUnitTest {
@Test
void givenTwoConsecutiveStrings_whenCompareTo_thenNegative() {
String first = "Google";
String second = "Microsoft";
assertThat(first.compareTo(second)).isNegative();
}
@Test
void givenTwoEqualsStrings_whenCompareTo_thenZero() {
String first = "Google";
String second = "Google";
assertThat(first.compareTo(second)).isZero();
}
@Test
void givenTwoConsecutiveStrings_whenReversedCompareTo_thenPositive() {
String first = "Google";
String second = "Microsoft";
assertThat(second.compareTo(first)).isPositive();
}
@Test
void givenTwoPersonWithEqualsAndWrongComparableAndConsecutiveLastNames_whenCompareTo_thenNegative() {
PersonWithEqualsAndWrongComparable richard = new PersonWithEqualsAndWrongComparable("Richard", "Jefferson");
PersonWithEqualsAndWrongComparable joe = new PersonWithEqualsAndWrongComparable("Joe", "Portman");
assertThat(richard.compareTo(joe)).isNegative();
}
@Test
void givenTwoPersonWithEqualsAndWrongComparableAndSameLastNames_whenReversedCompareTo_thenZero() {
PersonWithEqualsAndWrongComparable richard = new PersonWithEqualsAndWrongComparable("Richard", "Jefferson");
PersonWithEqualsAndWrongComparable mike = new PersonWithEqualsAndWrongComparable("Mike", "Jefferson");
assertThat(richard.compareTo(mike)).isZero();
}
@Test
void givenTwoPersonWithEqualsAndWrongComparableAndConsecutiveLastNames_whenReversedCompareTo_thenPositive() {
PersonWithEqualsAndWrongComparable richard = new PersonWithEqualsAndWrongComparable("Richard", "Jefferson");
PersonWithEqualsAndWrongComparable joe = new PersonWithEqualsAndWrongComparable("Joe", "Portman");
assertThat(joe.compareTo(richard)).isPositive();
}
@Test
void givenTwoPersonWithEqualsAndWrongComparableAndSameLastNames_whenSortedSet_thenProblem() {
PersonWithEqualsAndWrongComparable richard = new PersonWithEqualsAndWrongComparable("Richard", "Jefferson");
PersonWithEqualsAndWrongComparable mike = new PersonWithEqualsAndWrongComparable("Mike", "Jefferson");
SortedSet<PersonWithEqualsAndWrongComparable> people = new TreeSet<>();
people.add(richard);
people.add(mike);
assertThat(people).containsExactly(richard);
}
@Test
void givenTwoPersonWithEqualsAndComparableAndConsecutiveLastNames_whenCompareTo_thenNegative() {
PersonWithEqualsAndComparable richard = new PersonWithEqualsAndComparable("Richard", "Jefferson");
PersonWithEqualsAndComparable joe = new PersonWithEqualsAndComparable("Joe", "Portman");
assertThat(richard.compareTo(joe)).isNegative();
}
@Test
void givenTwoPersonWithEqualsAndComparableAndSameLastNames_whenReversedCompareTo_thenZero() {
PersonWithEqualsAndComparable richard = new PersonWithEqualsAndComparable("Richard", "Jefferson");
PersonWithEqualsAndComparable mike = new PersonWithEqualsAndComparable("Mike", "Jefferson");
assertThat(richard.compareTo(mike)).isPositive();
}
@Test
void givenTwoPersonWithEqualsAndComparableAndConsecutiveLastNames_whenReversedCompareTo_thenPositive() {
PersonWithEqualsAndComparable richard = new PersonWithEqualsAndComparable("Richard", "Jefferson");
PersonWithEqualsAndComparable joe = new PersonWithEqualsAndComparable("Joe", "Portman");
assertThat(joe.compareTo(richard)).isPositive();
}
@Test
void givenTwoPersonWithEqualsAndComparableAndSameLastNames_whenSortedSet_thenProblem() {
PersonWithEqualsAndComparable richard = new PersonWithEqualsAndComparable("Richard", "Jefferson");
PersonWithEqualsAndComparable mike = new PersonWithEqualsAndComparable("Mike", "Jefferson");
SortedSet<PersonWithEqualsAndComparable> people = new TreeSet<>();
people.add(richard);
people.add(mike);
assertThat(people).containsExactly(mike, richard);
}
}

81
core-java-modules/core-java-lang-2/src/test/java/com/baeldung/comparing/ComparatorInterfaceUnitTest.java Normal file
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package com.baeldung.comparing;
import org.junit.jupiter.api.Test;
import java.util.*;
import static org.assertj.core.api.Assertions.assertThat;
class ComparatorInterfaceUnitTest {
@Test
void givenListOfTwoPersonWithEqualsAndComparatorByFirstName_whenSort_thenSortedByFirstNames() {
PersonWithEquals joe = new PersonWithEquals("Joe", "Portman");
PersonWithEquals allan = new PersonWithEquals("Allan", "Dale");
List<PersonWithEquals> people = new ArrayList<>();
people.add(joe);
people.add(allan);
Comparator<PersonWithEquals> compareByFirstNames = new Comparator<PersonWithEquals>() {
@Override
public int compare(PersonWithEquals o1, PersonWithEquals o2) {
return o1.firstName().compareTo(o2.firstName());
}
};
people.sort(compareByFirstNames);
assertThat(people).containsExactly(allan, joe);
}
@Test
void givenListOfTwoPersonWithEqualsAndComparatorByFirstNameFunctionalStyle_whenSort_thenSortedByFirstNames() {
PersonWithEquals joe = new PersonWithEquals("Joe", "Portman");
PersonWithEquals allan = new PersonWithEquals("Allan", "Dale");
List<PersonWithEquals> people = new ArrayList<>();
people.add(joe);
people.add(allan);
Comparator<PersonWithEquals> compareByFirstNames = Comparator.comparing(PersonWithEquals::firstName);
people.sort(compareByFirstNames);
assertThat(people).containsExactly(allan, joe);
}
@Test
void givenTwoPersonWithEqualsAndComparableUsingComparatorAndConsecutiveLastNames_whenCompareTo_thenNegative() {
PersonWithEqualsAndComparableUsingComparator richard = new PersonWithEqualsAndComparableUsingComparator("Richard", "Jefferson");
PersonWithEqualsAndComparableUsingComparator joe = new PersonWithEqualsAndComparableUsingComparator("Joe", "Portman");
assertThat(richard.compareTo(joe)).isNegative();
}
@Test
void givenTwoPersonWithEqualsAndComparableUsingComparatorAndSameLastNames_whenReversedCompareTo_thenZero() {
PersonWithEqualsAndComparableUsingComparator richard = new PersonWithEqualsAndComparableUsingComparator("Richard", "Jefferson");
PersonWithEqualsAndComparableUsingComparator mike = new PersonWithEqualsAndComparableUsingComparator("Mike", "Jefferson");
assertThat(richard.compareTo(mike)).isPositive();
}
@Test
void givenTwoPersonWithEqualsAndComparableUsingComparatorAndConsecutiveLastNames_whenReversedCompareTo_thenPositive() {
PersonWithEqualsAndComparableUsingComparator richard = new PersonWithEqualsAndComparableUsingComparator("Richard", "Jefferson");
PersonWithEqualsAndComparableUsingComparator joe = new PersonWithEqualsAndComparableUsingComparator("Joe", "Portman");
assertThat(joe.compareTo(richard)).isPositive();
}
@Test
void givenTwoPersonWithEqualsAndComparableUsingComparatorAndSameLastNames_whenSortedSet_thenProblem() {
PersonWithEqualsAndComparableUsingComparator richard = new PersonWithEqualsAndComparableUsingComparator("Richard", "Jefferson");
PersonWithEqualsAndComparableUsingComparator mike = new PersonWithEqualsAndComparableUsingComparator("Mike", "Jefferson");
SortedSet<PersonWithEqualsAndComparableUsingComparator> people = new TreeSet<>();
people.add(richard);
people.add(mike);
assertThat(people).containsExactly(mike, richard);
}
}

116
core-java-modules/core-java-lang-2/src/test/java/com/baeldung/comparing/EqualityOperatorUnitTest.java Normal file
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package com.baeldung.comparing;
import org.junit.jupiter.api.Test;
import static org.assertj.core.api.Assertions.assertThat;
class EqualityOperatorUnitTest {
@Test
void givenTwoIntsWithSameValues_whenEqualityOperators_thenConsideredSame() {
int a = 1;
int b = 1;
assertThat(a == b).isTrue();
assertThat(a != b).isFalse();
}
@Test
void givenTwoIntsWithDifferentValues_whenEqualityOperators_thenNotConsideredSame() {
int a = 1;
int b = 2;
assertThat(a == b).isFalse();
assertThat(a != b).isTrue();
}
@Test
void givenTwoIntsWithSameValuesOneWrapped_whenEqualityOperators_thenConsideredSame() {
int a = 1;
Integer b = new Integer(1);
assertThat(a == b).isTrue();
assertThat(a != b).isFalse();
}
@Test
void givenTwoIntsWithDifferentValuesOneWrapped_whenEqualityOperators_thenNotConsideredSame() {
int a = 1;
Integer b = new Integer(2);
assertThat(a == b).isFalse();
assertThat(a != b).isTrue();
}
@Test
void givenTwoIntegersWithSameValues_whenEqualityOperators_thenNotConsideredSame() {
Integer a = new Integer(1);
Integer b = new Integer(1);
assertThat(a == b).isFalse();
assertThat(a != b).isTrue();
}
@Test
void givenTwoIntegersWithDifferentValues_whenEqualityOperators_thenNotConsideredSame() {
Integer a = new Integer(1);
Integer b = new Integer(2);
assertThat(a == b).isFalse();
assertThat(a != b).isTrue();
}
@Test
void givenTwoIntegersWithSameReference_whenEqualityOperators_thenConsideredSame() {
Integer a = new Integer(1);
Integer b = a;
assertThat(a == b).isTrue();
assertThat(a != b).isFalse();
}
@Test
void givenTwoIntegersFromValueOfWithSameValues_whenEqualityOperators_thenConsideredSame() {
Integer a = Integer.valueOf(1);
Integer b = Integer.valueOf(1);
assertThat(a == b).isTrue();
assertThat(a != b).isFalse();
}
@Test
void givenTwoStringsWithSameValues_whenEqualityOperators_thenNotConsideredSame() {
String a = new String("Hello!");
String b = new String("Hello!");
assertThat(a == b).isFalse();
assertThat(a != b).isTrue();
}
@Test
void givenTwoStringsFromLiteralsWithSameValues_whenEqualityOperators_thenConsideredSame() {
String a = "Hello!";
String b = "Hello!";
assertThat(a == b).isTrue();
assertThat(a != b).isFalse();
}
@Test
void givenTwoNullObjects_whenEqualityOperators_thenConsideredSame() {
Object a = null;
Object b = null;
assertThat(a == b).isTrue();
assertThat(a != b).isFalse();
}
@Test
void givenTwoObjectsOneNull_whenEqualityOperators_thenNotConsideredSame() {
Object a = null;
Object b = "Hello!";
assertThat(a == b).isFalse();
assertThat(a != b).isTrue();
}
}

73
core-java-modules/core-java-lang-2/src/test/java/com/baeldung/comparing/EqualsMethodUnitTest.java Normal file
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package com.baeldung.comparing;
import org.junit.jupiter.api.Test;
import static org.assertj.core.api.Assertions.assertThat;
import static org.junit.jupiter.api.Assertions.assertThrows;
class EqualsMethodUnitTest {
@Test
void givenTwoIntegersWithSameValue_whenEquals_thenTrue() {
Integer a = new Integer(1);
Integer b = new Integer(1);
assertThat(a.equals(b)).isTrue();
}
@Test
void givenTwoStringsWithSameValue_whenEquals_thenTrue() {
String a = new String("Hello!");
String b = new String("Hello!");
assertThat(a.equals(b)).isTrue();
}
@Test
void givenTwoStringsWithDifferentValue_whenEquals_thenFalse() {
String a = new String("Hello!");
String b = new String("Hello World!");
assertThat(a.equals(b)).isFalse();
}
@Test
void givenTwoObjectsFirstNull_whenEquals_thenNullPointerExceptionThrown() {
Object a = null;
Object b = new String("Hello!");
assertThrows(NullPointerException.class, () -> a.equals(b));
}
@Test
void givenTwoObjectsSecondNull_whenEquals_thenFalse() {
Object a = new String("Hello!");
Object b = null;
assertThat(a.equals(b)).isFalse();
}
@Test
void givenTwoPersonWithoutEqualsWithSameNames_whenEquals_thenFalse() {
PersonWithoutEquals joe = new PersonWithoutEquals("Joe", "Portman");
PersonWithoutEquals joeAgain = new PersonWithoutEquals("Joe", "Portman");
assertThat(joe.equals(joeAgain)).isFalse();
}
@Test
void givenTwoPersonWithEqualsWithSameNames_whenEquals_thenTrue() {
PersonWithEquals joe = new PersonWithEquals("Joe", "Portman");
PersonWithEquals joeAgain = new PersonWithEquals("Joe", "Portman");
assertThat(joe.equals(joeAgain)).isTrue();
}
@Test
void givenTwoPersonWittEqualsWithDifferentNames_whenEquals_thenFalse() {
PersonWithEquals joe = new PersonWithEquals("Joe", "Portman");
PersonWithEquals natalie = new PersonWithEquals("Natalie", "Portman");
assertThat(joe.equals(natalie)).isFalse();
}
}

73
core-java-modules/core-java-lang-2/src/test/java/com/baeldung/comparing/GuavaUnitTest.java Normal file
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package com.baeldung.comparing;
import com.google.common.base.Objects;
import com.google.common.collect.ComparisonChain;
import com.google.common.primitives.Ints;
import org.junit.jupiter.api.Nested;
import org.junit.jupiter.api.Test;
import static org.assertj.core.api.Assertions.assertThat;
class GuavaUnitTest {
@Nested
class ObjectsEqualMethod {
@Test
void givenTwoStringsWithSameValues_whenObjectsEqualMethods_thenTrue() {
String a = new String("Hello!");
String b = new String("Hello!");
assertThat(Objects.equal(a, b)).isTrue();
}
@Test
void givenTwoStringsWithDifferentValues_whenObjectsEqualMethods_thenFalse() {
String a = new String("Hello!");
String b = new String("Hello World!");
assertThat(Objects.equal(a, b)).isFalse();
}
}
@Nested
class ComparisonMethods {
@Test
void givenTwoIntsWithConsecutiveValues_whenIntsCompareMethods_thenNegative() {
int first = 1;
int second = 2;
assertThat(Ints.compare(first, second)).isNegative();
}
@Test
void givenTwoIntsWithSameValues_whenIntsCompareMethods_thenZero() {
int first = 1;
int second = 1;
assertThat(Ints.compare(first, second)).isZero();
}
@Test
void givenTwoIntsWithConsecutiveValues_whenIntsCompareMethodsReversed_thenNegative() {
int first = 1;
int second = 2;
assertThat(Ints.compare(second, first)).isPositive();
}
}
@Nested
class ComparisonChainClass {
@Test
void givenTwoPersonWithEquals_whenComparisonChainByLastNameThenFirstName_thenSortedJoeFirstAndNatalieSecond() {
PersonWithEquals natalie = new PersonWithEquals("Natalie", "Portman");
PersonWithEquals joe = new PersonWithEquals("Joe", "Portman");
int comparisonResult = ComparisonChain.start()
.compare(natalie.lastName(), joe.lastName())
.compare(natalie.firstName(), joe.firstName())
.result();
assertThat(comparisonResult).isPositive();
}
}
}

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