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Merge branch 'master' into BAEL-20886

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This commit is contained in:
Krzysiek
2020-02-07 21:43:20 +01:00
parent 86bf2e97cb 1c0383a313
commit f77c90f06e
983 changed files with 3332 additions and 2484 deletions
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algorithms-miscellaneous-2/README.md
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@@ -13,4 +13,5 @@ This module contains articles about algorithms. Some classes of algorithms, e.g.
- [Create a Sudoku Solver in Java](https://www.baeldung.com/java-sudoku)
- [Displaying Money Amounts in Words](https://www.baeldung.com/java-money-into-words)
- [A Collaborative Filtering Recommendation System in Java](https://www.baeldung.com/java-collaborative-filtering-recommendations)
- [Implementing A* Pathfinding in Java](https://www.baeldung.com/java-a-star-pathfinding)
- More articles: [[<-- prev]](/../algorithms-miscellaneous-1) [[next -->]](/../algorithms-miscellaneous-3)
algorithms-miscellaneous-5/README.md
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@@ -12,4 +12,5 @@ This module contains articles about algorithms. Some classes of algorithms, e.g.
- [How to Determine if a Binary Tree is Balanced](https://www.baeldung.com/java-balanced-binary-tree)
- [The Caesar Cipher in Java](https://www.baeldung.com/java-caesar-cipher)
- [Overview of Combinatorial Problems in Java](https://www.baeldung.com/java-combinatorial-algorithms)
- [Prim’s Algorithm](https://www.baeldung.com/java-prim-algorithm)
- More articles: [[<-- prev]](/../algorithms-miscellaneous-4)
apache-spark/README.md
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@@ -7,4 +7,4 @@ This module contains articles about Apache Spark
- [Introduction to Apache Spark](https://www.baeldung.com/apache-spark)
- [Building a Data Pipeline with Kafka, Spark Streaming and Cassandra](https://www.baeldung.com/kafka-spark-data-pipeline)
- [Machine Learning with Spark MLlib](https://www.baeldung.com/spark-mlib-machine-learning)
- [Introduction to Spark Graph Processing with GraphFrames](https://www.baeldung.com/spark-graph-graphframes)
apache-tapestry/README.md
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@@ -0,0 +1,3 @@
### Relevant Articles
- [Intro to Apache Tapestry](https://www.baeldung.com/apache-tapestry)
core-groovy-2/pom.xml
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@@ -77,7 +77,7 @@
<dependency>
<groupId>org.codehaus.groovy</groupId>
<artifactId>groovy-eclipse-compiler</artifactId>
<version>3.3.0-01</version>
<version>${groovy.compiler.version}</version>
</dependency>
<dependency>
<groupId>org.codehaus.groovy</groupId>
core-groovy-2/src/test/groovy/com/baeldung/category/CategoryUnitTest.groovy
+10 -11
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@@ -28,17 +28,16 @@ class CategoryUnitTest extends GroovyTestCase {
}
}
// http://team.baeldung.com/browse/BAEL-20687
// void test_whenUsingTimeCategory_thenOperationOnNumber() {
// SimpleDateFormat sdf = new SimpleDateFormat("dd/MM/yyyy")
// use (TimeCategory) {
// assert sdf.format(5.days.from.now) == sdf.format(new Date() + 5.days)
//
// sdf = new SimpleDateFormat("dd/MM/yyyy hh:mm:ss")
// assert sdf.format(10.minutes.from.now) == sdf.format(new Date() + 10.minutes)
// assert sdf.format(2.hours.ago) == sdf.format(new Date() - 2.hours)
// }
// }
void test_whenUsingTimeCategory_thenOperationOnNumber() {
SimpleDateFormat sdf = new SimpleDateFormat("dd/MM/yyyy")
use (TimeCategory) {
assert sdf.format(5.days.from.now) == sdf.format(new Date() + 5.days)
sdf = new SimpleDateFormat("dd/MM/yyyy hh:mm:ss")
assert sdf.format(10.minutes.from.now) == sdf.format(new Date() + 10.minutes)
assert sdf.format(2.hours.ago) == sdf.format(new Date() - 2.hours)
}
}
void test_whenUsingDOMCategory_thenOperationOnXML() {
core-groovy-2/src/test/groovy/com/baeldung/webservice/WebserviceUnitTest.groovy
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@@ -75,7 +75,6 @@ class WebserviceManualTest extends GroovyTestCase {
assert stories.size() == 5
}
/* see BAEL-3753
void test_whenConsumingSoap_thenReceiveResponse() {
def url = "http://www.dataaccess.com/webservicesserver/numberconversion.wso"
def soapClient = new SOAPClient(url)
@@ -90,7 +89,6 @@ class WebserviceManualTest extends GroovyTestCase {
def words = response.NumberToWordsResponse
assert words == "one thousand two hundred and thirty four "
}
*/
void test_whenConsumingRestGet_thenReceiveResponse() {
def path = "/get"
core-groovy/src/test/groovy/com/baeldung/file/ReadFileUnitTest.groovy
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@@ -33,7 +33,6 @@ class ReadFileUnitTest extends Specification {
assert lines.size(), 3
}
@Ignore
def 'Should return file content in string using ReadFile.readFileString given filePath' () {
given:
def filePath = "src/main/resources/fileContent.txt"
core-java-modules/core-java-11/pom.xml
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@@ -65,7 +65,7 @@
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-shade-plugin</artifactId>
<version>3.2.1</version>
<version>${shade.plugin.version}</version>
<executions>
<execution>
<phase>package</phase>
@@ -109,6 +109,7 @@
<uberjar.name>benchmarks</uberjar.name>
<jmh.version>1.22</jmh.version>
<eclipse.collections.version>10.0.0</eclipse.collections.version>
<shade.plugin.version>10.0.0</shade.plugin.version>
</properties>
</project>
core-java-modules/core-java-13/README.md
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@@ -0,0 +1,3 @@
### Relevant articles:
- [Java Switch Statement](https://www.baeldung.com/java-switch)
core-java-modules/core-java-14/.mvn/jvm.config
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@@ -0,0 +1 @@
--enable-preview
core-java-modules/core-java-14/README.md
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@@ -0,0 +1,7 @@
## Core Java 14
This module contains articles about Java 14.
### Relevant articles
- [Guide to the @Serial Annotation in Java 14](https://www.baeldung.com/java-14-serial-annotation)
core-java-modules/core-java-14/pom.xml
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@@ -1,53 +1,66 @@
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.baeldung</groupId>
<artifactId>core-java-14</artifactId>
<version>1.0.0-SNAPSHOT</version>
<name>core-java-14</name>
<packaging>jar</packaging>
<url>http://maven.apache.org</url>
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-14</artifactId>
<name>core-java-14</name>
<packaging>jar</packaging>
<url>http://maven.apache.org</url>
<parent>
<groupId>com.baeldung</groupId>
<artifactId>parent-modules</artifactId>
<version>1.0.0-SNAPSHOT</version>
<relativePath>../../</relativePath>
</parent>
<parent>
<groupId>com.baeldung</groupId>
<artifactId>parent-modules</artifactId>
<version>1.0.0-SNAPSHOT</version>
<relativePath>../../</relativePath>
</parent>
<dependencies>
<dependency>
<groupId>org.assertj</groupId>
<artifactId>assertj-core</artifactId>
<version>${assertj.version}</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.junit.jupiter</groupId>
<artifactId>junit-jupiter-engine</artifactId>
<version>${junit-jupiter.version}</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.junit.jupiter</groupId>
<artifactId>junit-jupiter-api</artifactId>
<version>${junit-jupiter.version}</version>
<scope>test</scope>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>${maven-compiler-plugin.version}</version>
<configuration>
<release>${maven.compiler.release}</release>
<compilerArgs>--enable-preview</compilerArgs>
</configuration>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-surefire-plugin</artifactId>
<version>${surefire.plugin.version}</version>
<configuration>
<argLine>--enable-preview</argLine>
</configuration>
</plugin>
</plugins>
</build>
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>${maven-compiler-plugin.version}</version>
<configuration>
<source>${maven.compiler.source.version}</source>
<target>${maven.compiler.target.version}</target>
<compilerArgs>
<compilerArg>
--enable-preview
</compilerArg>
</compilerArgs>
</configuration>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-surefire-plugin</artifactId>
<version>${surefire.plugin.version}</version>
<configuration>
<argLine>--enable-preview</argLine>
</configuration>
</plugin>
</plugins>
</build>
<properties>
<maven.compiler.source.version>14</maven.compiler.source.version>
<maven.compiler.target.version>14</maven.compiler.target.version>
<properties>
<maven.compiler.release>14</maven.compiler.release>
<assertj.version>3.6.1</assertj.version>
<maven-compiler-plugin.version>3.8.1</maven-compiler-plugin.version>
<surefire.plugin.version>3.0.0-M3</surefire.plugin.version>
</properties>
</properties>
</project>
core-java-modules/core-java-14/src/main/java/com/baeldung/java14/textblocks/TextBlocks13.java
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@@ -0,0 +1,46 @@
package com.baeldung.java14.textblocks;
public class TextBlocks13 {
public String getBlockOfHtml() {
return """
<html>
<body>
<span>example text</span>
</body>
</html>""";
}
public String getNonStandardIndent() {
return """
Indent
""";
}
public String getQuery() {
return """
select "id", "user"
from "table"
""";
}
public String getTextWithCarriageReturns() {
return """
separated with\r
carriage returns""";
}
public String getTextWithEscapes() {
return """
fun with\n
whitespace\t\r
and other escapes \"""
""";
}
public String getFormattedText(String parameter) {
return """
Some parameter: %s
""".formatted(parameter);
}
}
core-java-modules/core-java-14/src/main/java/com/baeldung/java14/textblocks/TextBlocks14.java
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@@ -0,0 +1,16 @@
package com.baeldung.java14.textblocks;
public class TextBlocks14 {
public String getIgnoredNewLines() {
return """
This is a long test which looks to \
have a newline but actually does not""";
}
public String getEscapedSpaces() {
return """
line 1
line 2 \s
""";
}
}
core-java-modules/core-java-14/src/main/java/com/baeldung/serial/MySerialClass.java
+29 -29
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@@ -10,41 +10,41 @@ import java.io.Serializable;
/**
* Class showcasing the usage of the Java 14 @Serial annotation.
*
*
* @author Donato Rimenti
*/
public class MySerialClass implements Serializable {
@Serial
private static final ObjectStreamField[] serialPersistentFields = null;
@Serial
private static final long serialVersionUID = 1;
@Serial
private void writeObject(ObjectOutputStream stream) throws IOException {
// ...
}
@Serial
private static final ObjectStreamField[] serialPersistentFields = null;
@Serial
private void readObject(ObjectInputStream stream) throws IOException, ClassNotFoundException {
// ...
}
@Serial
private static final long serialVersionUID = 1;
@Serial
private void readObjectNoData() throws ObjectStreamException {
// ...
}
@Serial
private void writeObject(ObjectOutputStream stream) throws IOException {
// ...
}
@Serial
private Object writeReplace() throws ObjectStreamException {
// ...
return null;
}
@Serial
private void readObject(ObjectInputStream stream) throws IOException, ClassNotFoundException {
// ...
}
@Serial
private Object readResolve() throws ObjectStreamException {
// ...
return null;
}
@Serial
private void readObjectNoData() throws ObjectStreamException {
// ...
}
@Serial
private Object writeReplace() throws ObjectStreamException {
// ...
return null;
}
@Serial
private Object readResolve() throws ObjectStreamException {
// ...
return null;
}
}
core-java-modules/core-java-14/src/test/java/com/baeldung/java14/textblocks/TextBlocks13UnitTest.java
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@@ -0,0 +1,58 @@
package com.baeldung.java14.textblocks;
import static org.assertj.core.api.Assertions.assertThat;
import org.junit.jupiter.api.Test;
class TextBlocks13UnitTest {
private TextBlocks13 subject = new TextBlocks13();
@Test
void givenAnOldStyleMultilineString_whenComparing_thenEqualsTextBlock() {
String expected = "<html>\n"
+ "\n"
+ " <body>\n"
+ " <span>example text</span>\n"
+ " </body>\n"
+ "</html>";
assertThat(subject.getBlockOfHtml()).isEqualTo(expected);
}
@Test
void givenAnOldStyleString_whenComparing_thenEqualsTextBlock() {
String expected = "<html>\n\n <body>\n <span>example text</span>\n </body>\n</html>";
assertThat(subject.getBlockOfHtml()).isEqualTo(expected);
}
@Test
void givenAnIndentedString_thenMatchesIndentedOldStyle() {
assertThat(subject.getNonStandardIndent()).isEqualTo(" Indent\n");
}
@Test
void givenAMultilineQuery_thenItCanContainUnescapedQuotes() {
assertThat(subject.getQuery()).contains("select \"id\", \"user\"");
}
@Test
void givenAMultilineQuery_thenItEndWithANewline() {
assertThat(subject.getQuery()).endsWith("\n");
}
@Test
void givenATextWithCarriageReturns_thenItContainsBoth() {
assertThat(subject.getTextWithCarriageReturns()).isEqualTo("separated with\r\ncarriage returns");
}
@Test
void givenAStringWithEscapedWhitespace_thenItAppearsInTheResultingString() {
assertThat(subject.getTextWithEscapes()).contains("fun with\n\n")
.contains("whitespace\t\r\n")
.contains("and other escapes \"\"\"");
}
@Test
void givenAFormattedString_thenTheParameterIsReplaced() {
assertThat(subject.getFormattedText("parameter")).contains("Some parameter: parameter");
}
}
core-java-modules/core-java-14/src/test/java/com/baeldung/java14/textblocks/TextBlocks14UnitTest.java
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@@ -0,0 +1,21 @@
package com.baeldung.java14.textblocks;
import static org.assertj.core.api.Assertions.assertThat;
import org.junit.jupiter.api.Test;
class TextBlocks14UnitTest {
private TextBlocks14 subject = new TextBlocks14();
@Test
void givenAStringWithEscapedNewLines_thenTheResultHasNoNewLines() {
String expected = "This is a long test which looks to have a newline but actually does not";
assertThat(subject.getIgnoredNewLines()).isEqualTo(expected);
}
@Test
void givenAStringWithEscapesSpaces_thenTheResultHasLinesEndingWithSpaces() {
String expected = "line 1\nline 2 \n";
assertThat(subject.getEscapedSpaces()).isEqualTo(expected);
}
}
core-java-modules/core-java-9/README.md
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@@ -9,6 +9,7 @@ This module contains articles about Java 9 core features
- [Iterate Through a Range of Dates in Java](https://www.baeldung.com/java-iterate-date-range)
- [Initialize a HashMap in Java](https://www.baeldung.com/java-initialize-hashmap)
- [Immutable Set in Java](https://www.baeldung.com/java-immutable-set)
- [Immutable ArrayList in Java](https://www.baeldung.com/java-immutable-list)
Note: also contains part of the code for the article
[How to Filter a Collection in Java](https://www.baeldung.com/java-collection-filtering).
core-java-modules/core-java-9/pom.xml
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@@ -37,6 +37,11 @@
<version>${junit.platform.version}</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.apache.commons</groupId>
<artifactId>commons-collections4</artifactId>
<version>${commons-collections4.version}</version>
</dependency>
</dependencies>
<build>
@@ -69,6 +74,7 @@
<maven.compiler.source>1.9</maven.compiler.source>
<maven.compiler.target>1.9</maven.compiler.target>
<guava.version>25.1-jre</guava.version>
<commons-collections4.version>4.1</commons-collections4.version>
</properties>
</project>
core-java-modules/core-java-9/src/test/java/com/baeldung/java9/list/immutable/ImmutableArrayListUnitTest.java
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@@ -0,0 +1,48 @@
package com.baeldung.java9.list.immutable;
import com.google.common.collect.ImmutableList;
import org.apache.commons.collections4.ListUtils;
import org.junit.Test;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.List;
public class ImmutableArrayListUnitTest {
@Test(expected = UnsupportedOperationException.class)
public final void givenUsingTheJdk_whenUnmodifiableListIsCreated_thenNotModifiable() {
final List<String> list = new ArrayList<>(Arrays.asList("one", "two", "three"));
final List<String> unmodifiableList = Collections.unmodifiableList(list);
unmodifiableList.add("four");
}
@Test(expected = UnsupportedOperationException.class)
public final void givenUsingTheJava9_whenUnmodifiableListIsCreated_thenNotModifiable() {
final List<String> list = new ArrayList<>(Arrays.asList("one", "two", "three"));
final List<String> unmodifiableList = List.of(list.toArray(new String[]{}));
unmodifiableList.add("four");
}
@Test(expected = UnsupportedOperationException.class)
public final void givenUsingGuava_whenUnmodifiableListIsCreated_thenNotModifiable() {
final List<String> list = new ArrayList<>(Arrays.asList("one", "two", "three"));
final List<String> unmodifiableList = ImmutableList.copyOf(list);
unmodifiableList.add("four");
}
@Test(expected = UnsupportedOperationException.class)
public final void givenUsingGuavaBuilder_whenUnmodifiableListIsCreated_thenNoLongerModifiable() {
final List<String> list = new ArrayList<>(Arrays.asList("one", "two", "three"));
final ImmutableList<String> unmodifiableList = ImmutableList.<String>builder().addAll(list).build();
unmodifiableList.add("four");
}
@Test(expected = UnsupportedOperationException.class)
public final void givenUsingCommonsCollections_whenUnmodifiableListIsCreated_thenNotModifiable() {
final List<String> list = new ArrayList<>(Arrays.asList("one", "two", "three"));
final List<String> unmodifiableList = ListUtils.unmodifiableList(list);
unmodifiableList.add("four");
}
}
core-java-modules/core-java-collections-array-list/README.md
+2 -3
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@@ -3,9 +3,8 @@
This module contains articles about the Java ArrayList collection
### Relevant Articles:
- [Immutable ArrayList in Java](http://www.baeldung.com/java-immutable-list)
- [Guide to the Java ArrayList](http://www.baeldung.com/java-arraylist)
- [Add Multiple Items to an Java ArrayList](http://www.baeldung.com/java-add-items-array-list)
- [Guide to the Java ArrayList](https://www.baeldung.com/java-arraylist)
- [Add Multiple Items to an Java ArrayList](https://www.baeldung.com/java-add-items-array-list)
- [ClassCastException: Arrays$ArrayList cannot be cast to ArrayList](https://www.baeldung.com/java-classcastexception-arrays-arraylist)
- [Multi Dimensional ArrayList in Java](https://www.baeldung.com/java-multi-dimensional-arraylist)
- [Removing an Element From an ArrayList](https://www.baeldung.com/java-arraylist-remove-element)
core-java-modules/core-java-collections-array-list/src/test/java/com/baeldung/collections/CoreJavaCollectionsUnitTest.java
+1 -32
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@@ -15,42 +15,11 @@ public class CoreJavaCollectionsUnitTest {
private static final Logger LOG = LoggerFactory.getLogger(CoreJavaCollectionsUnitTest.class);
// tests -
@Test
public final void givenUsingTheJdk_whenArrayListIsSynchronized_thenCorrect() {
final List<String> list = new ArrayList<String>(Arrays.asList("one", "two", "three"));
final List<String> list = new ArrayList<>(Arrays.asList("one", "two", "three"));
final List<String> synchronizedList = Collections.synchronizedList(list);
LOG.debug("Synchronized List is: " + synchronizedList);
}
@Test(expected = UnsupportedOperationException.class)
public final void givenUsingTheJdk_whenUnmodifiableListIsCreatedFromOriginal_thenNoLongerModifiable() {
final List<String> list = new ArrayList<String>(Arrays.asList("one", "two", "three"));
final List<String> unmodifiableList = Collections.unmodifiableList(list);
unmodifiableList.add("four");
}
@Test(expected = UnsupportedOperationException.class)
public final void givenUsingGuava_whenUnmodifiableListIsCreatedFromOriginal_thenNoLongerModifiable() {
final List<String> list = new ArrayList<String>(Arrays.asList("one", "two", "three"));
final List<String> unmodifiableList = ImmutableList.copyOf(list);
unmodifiableList.add("four");
}
@Test(expected = UnsupportedOperationException.class)
public final void givenUsingGuavaBuilder_whenUnmodifiableListIsCreatedFromOriginal_thenNoLongerModifiable() {
final List<String> list = new ArrayList<String>(Arrays.asList("one", "two", "three"));
final ImmutableList<String> unmodifiableList = ImmutableList.<String>builder().addAll(list).build();
unmodifiableList.add("four");
}
@Test(expected = UnsupportedOperationException.class)
public final void givenUsingCommonsCollections_whenUnmodifiableListIsCreatedFromOriginal_thenNoLongerModifiable() {
final List<String> list = new ArrayList<String>(Arrays.asList("one", "two", "three"));
final List<String> unmodifiableList = ListUtils.unmodifiableList(list);
unmodifiableList.add("four");
}
}
core-java-modules/core-java-concurrency-advanced-2/src/main/java/com/baeldung/threadlocalrandom/ThreadLocalRandomBenchMarkRunner.java
+12 -7
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@@ -1,22 +1,27 @@
package com.baeldung.threadlocalrandom;
import org.openjdk.jmh.runner.Runner;
import org.openjdk.jmh.runner.options.Options;
import org.openjdk.jmh.runner.options.ChainedOptionsBuilder;
import org.openjdk.jmh.runner.options.OptionsBuilder;
import com.google.common.collect.ImmutableList;
public class ThreadLocalRandomBenchMarkRunner {
public static void main(String[] args) throws Exception {
Options options = new OptionsBuilder().include(ThreadLocalRandomBenchMarker.class.getSimpleName())
.threads(1)
ChainedOptionsBuilder options = new OptionsBuilder().include(ThreadLocalRandomBenchMarker.class.getSimpleName())
.forks(1)
.shouldFailOnError(true)
.shouldDoGC(true)
.jvmArgs("-server")
.build();
new Runner(options).run();
.jvmArgs("-server");
for (Integer i : ImmutableList.of(1, 2, 8, 32)) {
new Runner(
options
.threads(i)
.build())
.run();
}
}
}
core-java-modules/core-java-concurrency-advanced-2/src/main/java/com/baeldung/threadlocalrandom/ThreadLocalRandomBenchMarker.java
+9 -39
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@@ -1,64 +1,34 @@
package com.baeldung.threadlocalrandom;
import java.util.ArrayList;
import java.util.List;
import java.util.Random;
import java.util.concurrent.Callable;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.ThreadLocalRandom;
import java.util.concurrent.TimeUnit;
import org.openjdk.jmh.annotations.Benchmark;
import org.openjdk.jmh.annotations.BenchmarkMode;
import org.openjdk.jmh.annotations.Level;
import org.openjdk.jmh.annotations.Mode;
import org.openjdk.jmh.annotations.OutputTimeUnit;
import org.openjdk.jmh.annotations.Scope;
import org.openjdk.jmh.annotations.Setup;
import org.openjdk.jmh.annotations.State;
import org.openjdk.jmh.annotations.Warmup;
@BenchmarkMode(Mode.AverageTime)
@BenchmarkMode(Mode.Throughput)
@Warmup(iterations = 1)
@OutputTimeUnit(TimeUnit.MICROSECONDS)
@State(Scope.Benchmark)
public class ThreadLocalRandomBenchMarker {
private final Random random = new Random();
List<Callable<Integer>> randomCallables = new ArrayList<>();
List<Callable<Integer>> threadLocalRandomCallables = new ArrayList<>();
@Setup(Level.Iteration)
public void init() {
Random random = new Random();
randomCallables = new ArrayList<>();
threadLocalRandomCallables = new ArrayList<>();
for (int i = 0; i < 1000; i++) {
randomCallables.add(() -> {
return random.nextInt();
});
}
for (int i = 0; i < 1000; i++) {
threadLocalRandomCallables.add(() -> {
return ThreadLocalRandom.current()
.nextInt();
});
}
@Benchmark
public int randomValuesUsingRandom() {
return random.nextInt();
}
@Benchmark
public void randomValuesUsingRandom() throws InterruptedException {
ExecutorService executor = Executors.newWorkStealingPool();
executor.invokeAll(randomCallables);
executor.shutdown();
}
@Benchmark
public void randomValuesUsingThreadLocalRandom() throws InterruptedException {
ExecutorService executor = Executors.newWorkStealingPool();
executor.invokeAll(threadLocalRandomCallables);
executor.shutdown();
public int randomValuesUsingThreadLocalRandom() {
return ThreadLocalRandom
.current()
.nextInt();
}
}
core-java-modules/core-java-exceptions-2/README.md
+3 -1
View File
@@ -2,4 +2,6 @@
This module contains articles about core java exceptions
###
### Relevant Articles:
- [Is It a Bad Practice to Catch Throwable?](https://www.baeldung.com/java-catch-throwable-bad-practice)
core-java-modules/core-java-io/README.md
+1
View File
@@ -13,4 +13,5 @@ This module contains articles about core Java input and output (IO)
- [Getting a File’s Mime Type in Java](https://www.baeldung.com/java-file-mime-type)
- [How to Write to a CSV File in Java](https://www.baeldung.com/java-csv)
- [How to Avoid the Java FileNotFoundException When Loading Resources](https://www.baeldung.com/java-classpath-resource-cannot-be-opened)
- [Create a Directory in Java](https://www.baeldung.com/java-create-directory)
- [[More -->]](/core-java-modules/core-java-io-2)
core-java-modules/core-java-jvm/README.md
+2
View File
@@ -10,3 +10,5 @@ This module contains articles about working with the Java Virtual Machine (JVM).
- [Class Loaders in Java](https://www.baeldung.com/java-classloaders)
- [A Guide to System.exit()](https://www.baeldung.com/java-system-exit)
- [Guide to System.gc()](https://www.baeldung.com/java-system-gc)
- [Runtime.getRuntime().halt() vs System.exit() in Java](https://www.baeldung.com/java-runtime-halt-vs-system-exit)
- [Adding Shutdown Hooks for JVM Applications](https://www.baeldung.com/jvm-shutdown-hooks)
core-java-modules/core-java-lang-2/pom.xml
+5
View File
@@ -15,6 +15,11 @@
</parent>
<dependencies>
<dependency>
<groupId>org.apache.commons</groupId>
<artifactId>commons-lang3</artifactId>
<version>3.9</version>
</dependency>
<dependency>
<groupId>commons-beanutils</groupId>
<artifactId>commons-beanutils</artifactId>
core-java-modules/core-java-lang-2/src/main/java/com/baeldung/methodmultiplereturnvalues/MultipleReturnValuesUsingApacheCommonsPair.java
+20
View File
@@ -0,0 +1,20 @@
package com.baeldung.methodmultiplereturnvalues;
import org.apache.commons.lang3.tuple.ImmutablePair;
import org.apache.commons.lang3.tuple.Pair;
import java.util.Comparator;
import java.util.List;
class MultipleReturnValuesUsingApacheCommonsPair {
static ImmutablePair<Coordinates, Double> getMostDistantPoint(
List<Coordinates> coordinatesList,
Coordinates target) {
return coordinatesList.stream()
.map(coordinates -> ImmutablePair.of(coordinates, coordinates.calculateDistance(target)))
.max(Comparator.comparingDouble(Pair::getRight))
.get();
}
}

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