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

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This commit is contained in:
Dhawal Kapil
2021-05-15 00:16:27 +05:30
parent fe69a3cb56 3c5b7234d9
commit 0875f56869
1289 changed files with 35455 additions and 5327 deletions
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core-java-modules/core-java-10/README.md
+1
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@@ -11,3 +11,4 @@ This module contains articles about Java 10 core features
- [Copying Sets in Java](https://www.baeldung.com/java-copy-sets)
- [Converting between a List and a Set in Java](https://www.baeldung.com/convert-list-to-set-and-set-to-list)
- [Java IndexOutOfBoundsException “Source Does Not Fit in Dest”](https://www.baeldung.com/java-indexoutofboundsexception)
- [Collect a Java Stream to an Immutable Collection](https://www.baeldung.com/java-stream-immutable-collection)
core-java-modules/core-java-10/pom.xml
+4 -5
View File
@@ -1,8 +1,7 @@
<?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">
<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-10</artifactId>
<version>0.1.0-SNAPSHOT</version>
@@ -44,4 +43,4 @@
<commons-collections4.version>4.1</commons-collections4.version>
</properties>
</project>
</project>
core-java-modules/core-java-10/src/test/java/com/baeldung/java10/streams/StreamToImmutableJava10UnitTest.java
+20
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@@ -0,0 +1,20 @@
package com.baeldung.java10.streams;
import static java.util.stream.Collectors.toUnmodifiableList;
import java.util.Arrays;
import java.util.List;
import org.junit.Test;
public class StreamToImmutableJava10UnitTest {
@Test
public void whenUsingCollectorsToUnmodifiableList_thenSuccess() {
List<String> givenList = Arrays.asList("a", "b", "c");
List<String> result = givenList.stream()
.collect(toUnmodifiableList());
System.out.println(result.getClass());
}
}
core-java-modules/core-java-11-2/pom.xml
+10 -5
View File
@@ -1,8 +1,7 @@
<?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">
<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-11-2</artifactId>
<version>0.1.0-SNAPSHOT</version>
@@ -51,6 +50,11 @@
<version>${junit.jupiter.version}</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.apache.commons</groupId>
<artifactId>commons-lang3</artifactId>
<version>${commons-lang3.version}</version>
</dependency>
</dependencies>
<build>
@@ -74,6 +78,7 @@
<junit.jupiter.version>5.7.0</junit.jupiter.version>
<assertj.version>3.17.2</assertj.version>
<mockserver.version>5.11.1</mockserver.version>
<commons-lang3.version>3.12.0</commons-lang3.version>
</properties>
</project>
</project>
core-java-modules/core-java-11-2/src/test/java/com/baeldung/version/VersionUnitTest.java
+48
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@@ -0,0 +1,48 @@
package com.baeldung.version;
import org.apache.commons.lang3.SystemUtils;
import org.assertj.core.api.Assertions;
import org.junit.jupiter.api.Disabled;
import org.junit.jupiter.api.Test;
public class VersionUnitTest {
@Test
public void givenJava_whenUsingRuntime_thenGetVersion() {
String expectedVersion = "11";
Runtime.Version runtimeVersion = Runtime.version();
String version = String.valueOf(runtimeVersion.version().get(0));
Assertions.assertThat(version).isEqualTo(expectedVersion);
}
@Test
@Disabled("Only valid for Java 8 and lower")
public void givenJava_whenUsingCommonsLang_thenGetVersion() {
int expectedVersion = 8;
String[] versionElements = SystemUtils.JAVA_SPECIFICATION_VERSION.split("\\.");
int discard = Integer.parseInt(versionElements[0]);
int version;
if (discard == 1) {
version = Integer.parseInt(versionElements[1]);
} else {
version = discard;
}
Assertions.assertThat(version).isEqualTo(expectedVersion);
}
@Test
@Disabled("Only valid for Java 8 and lower")
public void givenJava_whenUsingSystemProp_thenGetVersion() {
int expectedVersion = 8;
String[] versionElements = System.getProperty("java.version").split("\\.");
int discard = Integer.parseInt(versionElements[0]);
int version;
if (discard == 1) {
version = Integer.parseInt(versionElements[1]);
} else {
version = discard;
}
Assertions.assertThat(version).isEqualTo(expectedVersion);
}
}
core-java-modules/core-java-11/pom.xml
+8 -8
View File
@@ -1,6 +1,5 @@
<?xml version="1.0" encoding="UTF-8"?>
<project
xmlns="http://maven.apache.org/POM/4.0.0"
<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>
@@ -32,12 +31,12 @@
<dependency>
<groupId>org.openjdk.jmh</groupId>
<artifactId>jmh-core</artifactId>
<version>${jmh.version}</version>
<version>${jmh-core.version}</version>
</dependency>
<dependency>
<groupId>org.openjdk.jmh</groupId>
<artifactId>jmh-generator-annprocess</artifactId>
<version>${jmh.version}</version>
<version>${jmh-generator.version}</version>
<scope>provided</scope>
</dependency>
<dependency>
@@ -76,10 +75,12 @@
<configuration>
<finalName>${uberjar.name}</finalName>
<transformers>
<transformer implementation="org.apache.maven.plugins.shade.resource.ManifestResourceTransformer">
<transformer
implementation="org.apache.maven.plugins.shade.resource.ManifestResourceTransformer">
<mainClass>org.openjdk.jmh.Main</mainClass>
</transformer>
<transformer implementation="org.apache.maven.plugins.shade.resource.ServicesResourceTransformer" />
<transformer
implementation="org.apache.maven.plugins.shade.resource.ServicesResourceTransformer" />
</transformers>
<filters>
<filter>
@@ -105,9 +106,8 @@
<guava.version>27.1-jre</guava.version>
<assertj.version>3.11.1</assertj.version>
<uberjar.name>benchmarks</uberjar.name>
<jmh.version>1.22</jmh.version>
<eclipse.collections.version>10.0.0</eclipse.collections.version>
<shade.plugin.version>3.2.4</shade.plugin.version>
</properties>
</project>
</project>
core-java-modules/core-java-12/pom.xml
+1 -2
View File
@@ -1,6 +1,5 @@
<?xml version="1.0" encoding="UTF-8"?>
<project
xmlns="http://maven.apache.org/POM/4.0.0"
<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>
core-java-modules/core-java-13/pom.xml
+1 -2
View File
@@ -1,6 +1,5 @@
<?xml version="1.0" encoding="UTF-8"?>
<project
xmlns="http://maven.apache.org/POM/4.0.0"
<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>
core-java-modules/core-java-14/pom.xml
+3 -2
View File
@@ -1,6 +1,5 @@
<?xml version="1.0" encoding="UTF-8"?>
<project
xmlns="http://maven.apache.org/POM/4.0.0"
<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>
@@ -15,6 +14,7 @@
<version>1.0.0-SNAPSHOT</version>
<relativePath>../../</relativePath>
</parent>
<dependencies>
<dependency>
<groupId>org.assertj</groupId>
@@ -35,6 +35,7 @@
<scope>test</scope>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
core-java-modules/core-java-15/pom.xml
+1 -2
View File
@@ -1,6 +1,5 @@
<?xml version="1.0" encoding="UTF-8"?>
<project
xmlns="http://maven.apache.org/POM/4.0.0"
<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>
core-java-modules/core-java-8-2/pom.xml
+3 -3
View File
@@ -1,6 +1,5 @@
<?xml version="1.0" encoding="UTF-8"?>
<project
xmlns="http://maven.apache.org/POM/4.0.0"
<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>
@@ -8,6 +7,7 @@
<version>0.1.0-SNAPSHOT</version>
<name>core-java-8-2</name>
<packaging>jar</packaging>
<parent>
<groupId>com.baeldung.core-java-modules</groupId>
<artifactId>core-java-modules</artifactId>
@@ -34,4 +34,4 @@
<assertj.version>3.12.2</assertj.version>
</properties>
</project>
</project>
core-java-modules/core-java-8-datetime-2/pom.xml
+3 -4
View File
@@ -1,6 +1,5 @@
<?xml version="1.0" encoding="UTF-8"?>
<project
xmlns="http://maven.apache.org/POM/4.0.0"
<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>
@@ -8,6 +7,7 @@
<version>${project.parent.version}</version>
<name>core-java-8-datetime-2</name>
<packaging>jar</packaging>
<parent>
<groupId>com.baeldung.core-java-modules</groupId>
<artifactId>core-java-modules</artifactId>
@@ -47,7 +47,6 @@
<filtering>true</filtering>
</resource>
</resources>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
@@ -69,4 +68,4 @@
<assertj.version>3.6.1</assertj.version>
</properties>
</project>
</project>
core-java-modules/core-java-8-datetime/pom.xml
+4 -5
View File
@@ -1,6 +1,5 @@
<?xml version="1.0" encoding="UTF-8"?>
<project
xmlns="http://maven.apache.org/POM/4.0.0"
<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>
@@ -8,6 +7,7 @@
<version>${project.parent.version}</version>
<name>core-java-8-datetime</name>
<packaging>jar</packaging>
<parent>
<groupId>com.baeldung.core-java-modules</groupId>
<artifactId>core-java-modules</artifactId>
@@ -41,14 +41,13 @@
</dependencies>
<build>
<finalName>core-java-datetime-java8</finalName>
<finalName>core-java-8-datetime</finalName>
<resources>
<resource>
<directory>src/main/resources</directory>
<filtering>true</filtering>
</resource>
</resources>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
@@ -70,4 +69,4 @@
<assertj.version>3.6.1</assertj.version>
</properties>
</project>
</project>
core-java-modules/core-java-8/pom.xml
+3 -3
View File
@@ -1,6 +1,5 @@
<?xml version="1.0" encoding="UTF-8"?>
<project
xmlns="http://maven.apache.org/POM/4.0.0"
<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>
@@ -8,6 +7,7 @@
<version>0.1.0-SNAPSHOT</version>
<name>core-java-8</name>
<packaging>jar</packaging>
<parent>
<groupId>com.baeldung.core-java-modules</groupId>
<artifactId>core-java-modules</artifactId>
@@ -58,4 +58,4 @@
<assertj.version>3.6.1</assertj.version>
</properties>
</project>
</project>
core-java-modules/core-java-9-improvements/pom.xml
+2 -3
View File
@@ -1,6 +1,5 @@
<?xml version="1.0" encoding="UTF-8"?>
<project
xmlns="http://maven.apache.org/POM/4.0.0"
<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>
@@ -78,4 +77,4 @@
<guava.version>25.1-jre</guava.version>
</properties>
</project>
</project>
core-java-modules/core-java-9-jigsaw/pom.xml
+1 -2
View File
@@ -1,6 +1,5 @@
<?xml version="1.0" encoding="UTF-8"?>
<project
xmlns="http://maven.apache.org/POM/4.0.0"
<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>
core-java-modules/core-java-9-new-features/pom.xml
+4 -3
View File
@@ -1,6 +1,5 @@
<?xml version="1.0" encoding="UTF-8"?>
<project
xmlns="http://maven.apache.org/POM/4.0.0"
<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>
@@ -40,6 +39,7 @@
<scope>test</scope>
</dependency>
</dependencies>
<profiles>
<profile>
<id>incubator-features</id>
@@ -131,6 +131,7 @@
</build>
</profile>
</profiles>
<build>
<finalName>core-java-9-new-features</finalName>
<plugins>
@@ -164,4 +165,4 @@
<maven-jar-plugin.version>3.2.0</maven-jar-plugin.version>
</properties>
</project>
</project>
core-java-modules/core-java-9-streams/pom.xml
+2 -2
View File
@@ -1,6 +1,5 @@
<?xml version="1.0" encoding="UTF-8"?>
<project
xmlns="http://maven.apache.org/POM/4.0.0"
<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>
@@ -8,6 +7,7 @@
<version>0.1.0-SNAPSHOT</version>
<name>core-java-9-streams</name>
<packaging>jar</packaging>
<parent>
<groupId>com.baeldung.core-java-modules</groupId>
<artifactId>core-java-modules</artifactId>
core-java-modules/core-java-9/pom.xml
+2 -3
View File
@@ -1,6 +1,5 @@
<?xml version="1.0" encoding="UTF-8"?>
<project
xmlns="http://maven.apache.org/POM/4.0.0"
<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>
@@ -90,4 +89,4 @@
<commons-collections3.version>3.2.2</commons-collections3.version>
</properties>
</project>
</project>
core-java-modules/core-java-annotations/pom.xml
+1 -2
View File
@@ -1,6 +1,5 @@
<?xml version="1.0" encoding="UTF-8"?>
<project
xmlns="http://maven.apache.org/POM/4.0.0"
<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>
core-java-modules/core-java-annotations/src/main/java/com/baeldung/annotations/AnnotatedClass.java
+8
View File
@@ -0,0 +1,8 @@
package com.baeldung.annotations;
import javax.annotation.Generated;
@RetentionAnnotation
@Generated("Available only on source code")
public class AnnotatedClass {
}
core-java-modules/core-java-annotations/src/main/java/com/baeldung/annotations/RetentionAnnotation.java
+12
View File
@@ -0,0 +1,12 @@
package com.baeldung.annotations;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;
import static java.lang.annotation.ElementType.TYPE;
@Target(TYPE)
@Retention(RetentionPolicy.RUNTIME)
public @interface RetentionAnnotation {
}
core-java-modules/core-java-annotations/src/test/java/com/baeldung/annotations/AnnotatedClassUnitTest.java
+18
View File
@@ -0,0 +1,18 @@
package com.baeldung.annotations;
import org.junit.Test;
import java.lang.annotation.Annotation;
import static org.hamcrest.core.Is.is;
import static org.junit.Assert.assertThat;
public class AnnotatedClassUnitTest {
@Test
public void whenAnnotationRetentionPolicyRuntime_shouldAccess() {
AnnotatedClass anAnnotatedClass = new AnnotatedClass();
Annotation[] annotations = anAnnotatedClass.getClass().getAnnotations();
assertThat(annotations.length, is(1));
}
}
core-java-modules/core-java-annotations/src/test/java/com/baeldung/customannotations/JsonSerializerUnitTest.java → core-java-modules/core-java-annotations/src/test/java/com/baeldung/customannotations/ObjectToJsonConverterUnitTest.java
+1 -1
View File
@@ -5,7 +5,7 @@ import static org.junit.jupiter.api.Assertions.assertThrows;
import org.junit.jupiter.api.Test;
public class JsonSerializerUnitTest {
public class ObjectToJsonConverterUnitTest {
@Test
public void givenObjectNotSerializedThenExceptionThrown() throws JsonSerializationException {
core-java-modules/core-java-arrays-convert/pom.xml
+8 -7
View File
@@ -1,17 +1,17 @@
<?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">
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-arrays-convert</artifactId>
<name>core-java-arrays-convert</name>
<packaging>jar</packaging>
<parent>
<artifactId>core-java-modules</artifactId>
<groupId>com.baeldung.core-java-modules</groupId>
<version>0.0.1-SNAPSHOT</version>
</parent>
<modelVersion>4.0.0</modelVersion>
<artifactId>core-java-arrays-convert</artifactId>
<name>core-java-arrays-convert</name>
<packaging>jar</packaging>
<dependencies>
<dependency>
@@ -24,4 +24,5 @@
<properties>
<guava.version>28.2-jre</guava.version>
</properties>
</project>
core-java-modules/core-java-arrays-guides/pom.xml
+15 -12
View File
@@ -1,32 +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">
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-arrays-guides</artifactId>
<name>core-java-arrays-guides</name>
<packaging>jar</packaging>
<parent>
<artifactId>core-java-modules</artifactId>
<groupId>com.baeldung.core-java-modules</groupId>
<version>0.0.1-SNAPSHOT</version>
</parent>
<modelVersion>4.0.0</modelVersion>
<artifactId>core-java-arrays-guides</artifactId>
<name>core-java-arrays-guides</name>
<packaging>jar</packaging>
<dependencies>
<dependency>
<groupId>org.openjdk.jmh</groupId>
<artifactId>jmh-core</artifactId>
<version>${jmh.version}</version>
<version>${jmh-core.version}</version>
</dependency>
<dependency>
<groupId>org.openjdk.jmh</groupId>
<artifactId>jmh-generator-annprocess</artifactId>
<version>${jmh.version}</version>
<version>${jmh-generator.version}</version>
</dependency>
<dependency>
<groupId>org.assertj</groupId>
<artifactId>assertj-core</artifactId>
<version>3.19.0</version>
<scope>test</scope>
</dependency>
</dependencies>
<properties>
<jmh.version>1.19</jmh.version>
</properties>
</project>
core-java-modules/core-java-arrays-guides/src/test/java/com/baeldung/genericarrays/ListToArrayUnitTest.java
-1
View File
@@ -2,7 +2,6 @@ package com.baeldung.genericarrays;
import org.junit.Test;
import java.util.ArrayList;
import java.util.LinkedList;
import java.util.List;
core-java-modules/core-java-arrays-guides/src/test/java/com/baeldung/genericarrays/StreamToArrayUnitTest.java
+77
View File
@@ -0,0 +1,77 @@
package com.baeldung.genericarrays;
import org.junit.Test;
import java.util.ArrayList;
import java.util.List;
import java.util.Optional;
import java.util.function.IntFunction;
import java.util.stream.Stream;
import static java.util.Collections.singletonList;
import static org.assertj.core.api.Assertions.assertThat;
import static org.assertj.core.api.Assertions.assertThatThrownBy;
public class StreamToArrayUnitTest {
@Test
public void givenAStream_thenCanGetArrayOfObject() {
Object[] strings = Stream.of("A", "AAA", "B", "AAB", "C")
.filter(string -> string.startsWith("A"))
.toArray();
assertThat(strings).containsExactly("A", "AAA", "AAB");
assertThat(strings).isNotInstanceOf(String[].class);
}
@Test
public void givenAStream_thenCanGetArrayOfString() {
String[] strings = Stream.of("A", "AAA", "B", "AAB", "C")
.filter(string -> string.startsWith("A"))
.toArray(String[]::new);
assertThat(strings).containsExactly("A", "AAA", "AAB");
assertThat(strings).isInstanceOf(String[].class);
}
@SuppressWarnings("unchecked")
@Test
public void givenAStream_whenConvertToOptional_thenCanGetArrayOfOptional() {
Stream<Optional<String>> stream = Stream.of("A", "AAA", "B", "AAB", "C")
.filter(string -> string.startsWith("A"))
.map(Optional::of);
Optional<String>[] strings = stream
.toArray(Optional[]::new);
assertThat(strings).containsExactly(Optional.of("A"),
Optional.of("AAA"),
Optional.of("AAB"));
assertThat(strings).isInstanceOf(Optional[].class);
}
@Test
public void givenAStream_whenConvertToOptional_thenCanGetArrayOfOptionalWithHelper() {
Optional<String>[] strings = Stream.of("A", "AAA", "B", "AAB", "C")
.filter(string -> string.startsWith("A"))
.map(Optional::of)
.toArray(genericArray(Optional[]::new));
assertThat(strings).containsExactly(Optional.of("A"),
Optional.of("AAA"),
Optional.of("AAB"));
assertThat(strings).isInstanceOf(Optional[].class);
}
@Test
public void whenInvalidUseOfGenericArray_thenIllegalCast() {
assertThatThrownBy(() -> {
ArrayList<String>[] lists = Stream.of(singletonList("A"))
.toArray(genericArray(List[]::new));
}).isInstanceOf(ClassCastException.class);
}
@SuppressWarnings("unchecked")
private static <T, R extends T> IntFunction<R[]> genericArray(IntFunction<T[]> arrayCreator) {
return size -> (R[])arrayCreator.apply(size);
}
}
core-java-modules/core-java-arrays-multidimensional/pom.xml
+7 -6
View File
@@ -1,15 +1,16 @@
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
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-arrays-multidimensional</artifactId>
<name>core-java-arrays-multidimensional</name>
<packaging>jar</packaging>
<parent>
<artifactId>core-java-modules</artifactId>
<groupId>com.baeldung.core-java-modules</groupId>
<version>0.0.1-SNAPSHOT</version>
</parent>
<modelVersion>4.0.0</modelVersion>
<artifactId>core-java-arrays-multidimensional</artifactId>
<name>core-java-arrays-multidimensional</name>
<packaging>jar</packaging>
</project>
core-java-modules/core-java-arrays-operations-advanced/README.md
+1
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@@ -9,3 +9,4 @@ This module contains articles about advanced operations on arrays in Java. They
- [Find Sum and Average in a Java Array](https://www.baeldung.com/java-array-sum-average)
- [Intersection Between two Integer Arrays](https://www.baeldung.com/java-array-intersection)
- [Comparing Arrays in Java](https://www.baeldung.com/java-comparing-arrays)
- [Concatenate Two Arrays in Java](https://www.baeldung.com/java-concatenate-arrays)

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