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java-tutorials
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rodolforfq 2019-03-03 17:57:19 -04:00 committed by GitHub
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7
.gitignore vendored
View File

@ -66,3 +66,10 @@ jmeter/src/main/resources/*-JMeter.csv
**/nb-configuration.xml
core-scala/.cache-main
core-scala/.cache-tests
persistence-modules/hibernate5/transaction.log
apache-avro/src/main/java/com/baeldung/avro/model/
jta/transaction-logs/
software-security/sql-injection-samples/derby.log
spring-soap/src/main/java/com/baeldung/springsoap/gen/

2
JGit/pom.xml
View File

@ -5,9 +5,9 @@
<groupId>com.baeldung</groupId>
<artifactId>JGit</artifactId>
<version>1.0-SNAPSHOT</version>
<name>JGit</name>
<packaging>jar</packaging>
<url>http://maven.apache.org</url>
<name>JGit</name>
<parent>
<groupId>com.baeldung</groupId>

2
Twitter4J/pom.xml
View File

@ -2,8 +2,8 @@
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
<modelVersion>4.0.0</modelVersion>
<artifactId>Twitter4J</artifactId>
<packaging>jar</packaging>
<name>Twitter4J</name>
<packaging>jar</packaging>
<parent>
<groupId>com.baeldung</groupId>

3
akka-http/pom.xml
View File

@ -23,7 +23,7 @@
<dependency>
<groupId>com.typesafe.akka</groupId>
<artifactId>akka-stream_2.12</artifactId>
<version>2.5.11</version>
<version>${akka.stream.version}</version>
</dependency>
<dependency>
<groupId>com.typesafe.akka</groupId>
@ -41,7 +41,6 @@
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
<java.version>1.8</java.version>
<akka.http.version>10.0.11</akka.http.version>
<akka.stream.version>2.5.11</akka.stream.version>
</properties>

1
algorithms-genetic/pom.xml
View File

@ -54,7 +54,6 @@
</build>
<properties>
<lombok.version>1.16.12</lombok.version>
<commons-math3.version>3.6.1</commons-math3.version>
<io.jenetics.version>3.7.0</io.jenetics.version>
<org.assertj.core.version>3.9.0</org.assertj.core.version>

2
algorithms-miscellaneous-1/README.md
View File

@ -15,3 +15,5 @@
- [Find Substrings That Are Palindromes in Java](https://www.baeldung.com/java-palindrome-substrings)
- [Find the Longest Substring without Repeating Characters](https://www.baeldung.com/java-longest-substring-without-repeated-characters)
- [Java Two Pointer Technique](https://www.baeldung.com/java-two-pointer-technique)
- [Permutations of an Array in Java](https://www.baeldung.com/java-array-permutations)
- [Implementing Simple State Machines with Java Enums](https://www.baeldung.com/java-enum-simple-state-machine)

1
algorithms-miscellaneous-1/pom.xml
View File

@ -74,7 +74,6 @@
</reporting>
<properties>
<lombok.version>1.16.12</lombok.version>
<commons-math3.version>3.6.1</commons-math3.version>
<org.assertj.core.version>3.9.0</org.assertj.core.version>
<commons-codec.version>1.11</commons-codec.version>

4
algorithms-miscellaneous-2/pom.xml
View File

@ -68,7 +68,7 @@
<plugin>
<groupId>org.codehaus.mojo</groupId>
<artifactId>cobertura-maven-plugin</artifactId>
<version>2.7</version>
<version>${cobertura-maven-plugin.version}</version>
<configuration>
<instrumentation>
<ignores>
@ -84,13 +84,13 @@
</reporting>
<properties>
<lombok.version>1.16.12</lombok.version>
<commons-math3.version>3.6.1</commons-math3.version>
<tradukisto.version>1.0.1</tradukisto.version>
<org.jgrapht.core.version>1.0.1</org.jgrapht.core.version>
<org.jgrapht.ext.version>1.0.1</org.jgrapht.ext.version>
<org.assertj.core.version>3.9.0</org.assertj.core.version>
<commons-codec.version>1.11</commons-codec.version>
<cobertura-maven-plugin.version>2.7</cobertura-maven-plugin.version>
</properties>
</project>

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algorithms-miscellaneous-2/src/test/resources/graph.png
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1
algorithms-sorting/pom.xml
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@ -49,7 +49,6 @@
</build>
<properties>
<lombok.version>1.16.12</lombok.version>
<commons-math3.version>3.6.1</commons-math3.version>
<org.assertj.core.version>3.9.0</org.assertj.core.version>
<commons-codec.version>1.11</commons-codec.version>

2
animal-sniffer-mvn-plugin/pom.xml
View File

@ -3,9 +3,9 @@
<modelVersion>4.0.0</modelVersion>
<groupId>com.baeldung</groupId>
<artifactId>animal-sniffer-mvn-plugin</artifactId>
<packaging>jar</packaging>
<version>1.0-SNAPSHOT</version>
<name>animal-sniffer-mvn-plugin</name>
<packaging>jar</packaging>
<url>http://maven.apache.org</url>
<parent>

2
annotations/pom.xml
View File

@ -3,8 +3,8 @@
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>annotations</artifactId>
<packaging>pom</packaging>
<name>annotations</name>
<packaging>pom</packaging>
<parent>
<artifactId>parent-modules</artifactId>

16
apache-avro/pom.xml
View File

@ -7,14 +7,6 @@
<version>0.0.1-SNAPSHOT</version>
<name>apache-avro</name>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<compiler-plugin.version>3.5</compiler-plugin.version>
<avro.version>1.8.2</avro.version>
<java.version>1.8</java.version>
<slf4j.version>1.7.25</slf4j.version>
</properties>
<parent>
<groupId>com.baeldung</groupId>
<artifactId>parent-modules</artifactId>
@ -85,4 +77,12 @@
</plugin>
</plugins>
</build>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<compiler-plugin.version>3.5</compiler-plugin.version>
<avro.version>1.8.2</avro.version>
<slf4j.version>1.7.25</slf4j.version>
</properties>
</project>

5
apache-curator/pom.xml
View File

@ -3,8 +3,8 @@
<modelVersion>4.0.0</modelVersion>
<artifactId>apache-curator</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>jar</packaging>
<name>apache-curator</name>
<packaging>jar</packaging>
<parent>
<groupId>com.baeldung</groupId>
@ -39,7 +39,7 @@
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-databind</artifactId>
<version>${jackson-databind.version}</version>
<version>${jackson.version}</version>
</dependency>
<!-- test scoped -->
<dependency>
@ -59,7 +59,6 @@
<properties>
<curator.version>4.0.1</curator.version>
<zookeeper.version>3.4.11</zookeeper.version>
<jackson-databind.version>2.9.7</jackson-databind.version>
<!-- testing -->
<assertj.version>3.6.1</assertj.version>
<avaitility.version>1.7.0</avaitility.version>

34
apache-geode/pom.xml
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@ -12,22 +12,6 @@
<artifactId>parent-modules</artifactId>
<version>1.0.0-SNAPSHOT</version>
</parent>
<properties>
<geode.core>1.6.0</geode.core>
</properties>
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<configuration>
<source>1.8</source>
<target>1.8</target>
</configuration>
</plugin>
</plugins>
</build>
<dependencies>
<dependency>
@ -38,8 +22,24 @@
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>RELEASE</version>
<version>${junit.version}</version>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<configuration>
<source>${java.version}</source>
<target>${java.version}</target>
</configuration>
</plugin>
</plugins>
</build>
<properties>
<geode.core>1.6.0</geode.core>
</properties>
</project>

29
apache-meecrowave/pom.xml
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@ -7,51 +7,58 @@
<name>apache-meecrowave</name>
<description>A sample REST API application with Meecrowave</description>
<properties>
<maven.compiler.source>1.8</maven.compiler.source>
<maven.compiler.target>1.8</maven.compiler.target>
</properties>
<dependencies>
<!-- https://mvnrepository.com/artifact/org.apache.meecrowave/meecrowave-core -->
<dependency>
<groupId>org.apache.meecrowave</groupId>
<artifactId>meecrowave-core</artifactId>
<version>1.2.1</version>
<version>${meecrowave-core.version}</version>
</dependency>
<!-- https://mvnrepository.com/artifact/org.apache.meecrowave/meecrowave-jpa -->
<dependency>
<groupId>org.apache.meecrowave</groupId>
<artifactId>meecrowave-jpa</artifactId>
<version>1.2.1</version>
<version>${meecrowave-jpa.version}</version>
</dependency>
<dependency>
<groupId>com.squareup.okhttp3</groupId>
<artifactId>okhttp</artifactId>
<version>3.10.0</version>
<version>${okhttp.version}</version>
</dependency>
<dependency>
<groupId>org.apache.meecrowave</groupId>
<artifactId>meecrowave-junit</artifactId>
<version>1.2.0</version>
<version>${meecrowave-junit.version}</version>
<scope>test</scope>
</dependency>
<!-- https://mvnrepository.com/artifact/junit/junit -->
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.10</version>
<version>${junit.version}</version>
<scope>test</scope>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.apache.meecrowave</groupId>
<artifactId>meecrowave-maven-plugin</artifactId>
<version>1.2.1</version>
<version>${meecrowave-maven-plugin.version}</version>
</plugin>
</plugins>
</build>
<properties>
<maven.compiler.source>1.8</maven.compiler.source>
<maven.compiler.target>1.8</maven.compiler.target>
<junit.version>4.10</junit.version>
<meecrowave-junit.version>1.2.0</meecrowave-junit.version>
<okhttp.version>3.10.0</okhttp.version>
<meecrowave-jpa.version>1.2.1</meecrowave-jpa.version>
<meecrowave-core.version>1.2.1</meecrowave-core.version>
<meecrowave-maven-plugin.version>1.2.1</meecrowave-maven-plugin.version>
</properties>
</project>

4
apache-pulsar/pom.xml
View File

@ -11,12 +11,14 @@
<dependency>
<groupId>org.apache.pulsar</groupId>
<artifactId>pulsar-client</artifactId>
<version>2.1.1-incubating</version>
<version>${pulsar-client.version}</version>
<scope>compile</scope>
</dependency>
</dependencies>
<properties>
<maven.compiler.target>1.8</maven.compiler.target>
<maven.compiler.source>1.8</maven.compiler.source>
<pulsar-client.version>2.1.1-incubating</pulsar-client.version>
</properties>
</project>

2
apache-solrj/pom.xml
View File

@ -4,8 +4,8 @@
<groupId>com.baeldung</groupId>
<artifactId>apache-solrj</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>jar</packaging>
<name>apache-solrj</name>
<packaging>jar</packaging>
<parent>
<groupId>com.baeldung</groupId>

1
apache-spark/README.md
View File

@ -1,3 +1,4 @@
### Relevant articles
- [Introduction to Apache Spark](http://www.baeldung.com/apache-spark)
- [Building a Data Pipeline with Kafka, Spark Streaming and Cassandra](https://www.baeldung.com/kafka-spark-data-pipeline)

9
apache-spark/pom.xml
View File

@ -4,8 +4,8 @@
<groupId>com.baeldung</groupId>
<artifactId>apache-spark</artifactId>
<version>1.0-SNAPSHOT</version>
<packaging>jar</packaging>
<name>apache-spark</name>
<packaging>jar</packaging>
<url>http://maven.apache.org</url>
<parent>
@ -54,10 +54,10 @@
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>3.2</version>
<version>${maven-compiler-plugin.version}</version>
<configuration>
<source>1.8</source>
<target>1.8</target>
<source>${java.version}</source>
<target>${java.version}</target>
</configuration>
</plugin>
<plugin>
@ -85,6 +85,7 @@
<org.apache.spark.spark-streaming-kafka.version>2.3.0</org.apache.spark.spark-streaming-kafka.version>
<com.datastax.spark.spark-cassandra-connector.version>2.3.0</com.datastax.spark.spark-cassandra-connector.version>
<com.datastax.spark.spark-cassandra-connector-java.version>1.5.2</com.datastax.spark.spark-cassandra-connector-java.version>
<maven-compiler-plugin.version>3.2</maven-compiler-plugin.version>
</properties>
</project>

2
apache-velocity/pom.xml
View File

@ -4,8 +4,8 @@
<groupId>com.baeldung</groupId>
<version>0.1-SNAPSHOT</version>
<artifactId>apache-velocity</artifactId>
<packaging>war</packaging>
<name>apache-velocity</name>
<packaging>war</packaging>
<parent>
<groupId>com.baeldung</groupId>

2
aws-lambda/pom.xml
View File

@ -5,8 +5,8 @@
<groupId>com.baeldung</groupId>
<artifactId>aws-lambda</artifactId>
<version>0.1.0-SNAPSHOT</version>
<packaging>jar</packaging>
<name>aws-lambda</name>
<packaging>jar</packaging>
<parent>
<artifactId>parent-modules</artifactId>

2
aws/pom.xml
View File

@ -4,8 +4,8 @@
<groupId>com.baeldung</groupId>
<artifactId>aws</artifactId>
<version>0.1.0-SNAPSHOT</version>
<packaging>jar</packaging>
<name>aws</name>
<packaging>jar</packaging>
<parent>
<groupId>com.baeldung</groupId>

2
axon/pom.xml
View File

@ -36,7 +36,7 @@
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-autoconfigure</artifactId>
<version>2.1.1.RELEASE</version>
<version>${spring-boot.version}</version>
<scope>compile</scope>
</dependency>

3
azure/pom.xml
View File

@ -5,9 +5,9 @@
<groupId>com.baeldung</groupId>
<artifactId>azure</artifactId>
<version>0.1</version>
<packaging>war</packaging>
<name>azure</name>
<description>Demo project for Spring Boot on Azure</description>
<packaging>war</packaging>
<parent>
<artifactId>parent-boot-2</artifactId>
@ -127,7 +127,6 @@
<docker.image.prefix>${azure.containerRegistry}.azurecr.io</docker.image.prefix>
<docker-maven-plugin.version>1.1.0</docker-maven-plugin.version>
<azure-webapp-maven-plugin.version>1.1.0</azure-webapp-maven-plugin.version>
<java.version>1.8</java.version>
</properties>
</project>

58
blade/pom.xml
View File

@ -3,12 +3,12 @@
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
<modelVersion>4.0.0</modelVersion>
<artifactId>blade</artifactId>
<name>blade</name>
<!-- WITH THIS mvn integration-test DOES WORK -->
<groupId>com.baeldung</groupId>
<artifactId>blade</artifactId>
<version>1.0.0-SNAPSHOT</version>
<name>blade</name>
<!-- WITH THIS mvn integration-test DOESN'T WORK -->
<!-- <parent> -->
@ -17,35 +17,30 @@
<!-- <version>1.0.0-SNAPSHOT</version> -->
<!-- </parent> -->
<properties>
<maven.compiler.source>1.8</maven.compiler.source>
<maven.compiler.target>1.8</maven.compiler.target>
</properties>
<dependencies>
<dependency>
<groupId>com.bladejava</groupId>
<artifactId>blade-mvc</artifactId>
<version>2.0.14.RELEASE</version>
<version>${blade-mvc.version}</version>
</dependency>
<dependency>
<groupId>org.webjars</groupId>
<artifactId>bootstrap</artifactId>
<version>4.2.1</version>
<version>${bootstrap.version}</version>
</dependency>
<dependency>
<groupId>org.apache.commons</groupId>
<artifactId>commons-lang3</artifactId>
<version>3.8.1</version>
<version>${commons-lang3.version}</version>
</dependency>
<!-- PROVIDED -->
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<version>1.18.4</version>
<version>${lombok.version}</version>
<scope>provided</scope>
</dependency>
@ -53,31 +48,31 @@
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.12</version>
<version>${junit.version}</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.assertj</groupId>
<artifactId>assertj-core</artifactId>
<version>3.11.1</version>
<version>${assertj-core.version}</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.apache.httpcomponents</groupId>
<artifactId>httpclient</artifactId>
<version>4.5.6</version>
<version>${httpclient.version}</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.apache.httpcomponents</groupId>
<artifactId>httpmime</artifactId>
<version>4.5.6</version>
<version>${httpmime.version}</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.apache.httpcomponents</groupId>
<artifactId>httpcore</artifactId>
<version>4.4.10</version>
<version>${httpcore.version}</version>
<scope>test</scope>
</dependency>
</dependencies>
@ -88,6 +83,7 @@
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-surefire-plugin</artifactId>
<version>${maven-surefire-plugin.version}</version>
<configuration>
<forkCount>3</forkCount>
<reuseForks>true</reuseForks>
@ -100,7 +96,7 @@
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-failsafe-plugin</artifactId>
<version>3.0.0-M3</version>
<version>${maven-failsafe-plugin.version}</version>
<configuration>
<includes>
<include>**/*LiveTest.java</include>
@ -119,7 +115,7 @@
<plugin>
<groupId>com.bazaarvoice.maven.plugins</groupId>
<artifactId>process-exec-maven-plugin</artifactId>
<version>0.7</version>
<version>${process-exec-maven-plugin.version}</version>
<executions>
<!--Start Blade -->
<execution>
@ -177,13 +173,33 @@
</executions>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>${maven-compiler-plugin.version}</version>
<configuration>
<source>1.8</source>
<target>1.8</target>
<source>${maven.compiler.source}</source>
<target>${maven.compiler.target}</target>
<encoding>UTF-8</encoding>
</configuration>
</plugin>
</plugins>
</build>
<properties>
<maven.compiler.source>1.8</maven.compiler.source>
<maven.compiler.target>1.8</maven.compiler.target>
<blade-mvc.version>2.0.14.RELEASE</blade-mvc.version>
<bootstrap.version>4.2.1</bootstrap.version>
<commons-lang3.version>3.8.1</commons-lang3.version>
<lombok.version>1.18.4</lombok.version>
<junit.version>4.12</junit.version>
<httpclient.version>4.5.6</httpclient.version>
<httpmime.version>4.5.6</httpmime.version>
<httpcore.version>4.4.10</httpcore.version>
<assertj-core.version>3.11.1</assertj-core.version>
<maven-failsafe-plugin.version>3.0.0-M3</maven-failsafe-plugin.version>
<process-exec-maven-plugin.version>0.7</process-exec-maven-plugin.version>
<maven-surefire-plugin.version>2.21.0</maven-surefire-plugin.version>
<maven-compiler-plugin.version>3.7.0</maven-compiler-plugin.version>
</properties>
</project>

2
bootique/pom.xml
View File

@ -3,9 +3,9 @@
<modelVersion>4.0.0</modelVersion>
<groupId>com.baeldung.bootique</groupId>
<artifactId>bootique</artifactId>
<packaging>jar</packaging>
<version>1.0-SNAPSHOT</version>
<name>bootique</name>
<packaging>jar</packaging>
<url>http://maven.apache.org</url>
<parent>

2
cas/cas-secured-app/pom.xml
View File

@ -3,9 +3,9 @@
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>cas-secured-app</artifactId>
<packaging>jar</packaging>
<name>cas-secured-app</name>
<description>Demo project for CAS</description>
<packaging>jar</packaging>
<parent>
<artifactId>parent-boot-1</artifactId>

2
cdi/pom.xml
View File

@ -59,13 +59,13 @@
<scope>test</scope>
</dependency>
</dependencies>
<properties>
<cdi-api.version>2.0.SP1</cdi-api.version>
<weld-se-core.version>3.0.5.Final</weld-se-core.version>
<aspectjweaver.version>1.9.2</aspectjweaver.version>
<hamcrest-core.version>1.3</hamcrest-core.version>
<assertj-core.version>3.10.0</assertj-core.version>
<junit.version>4.12</junit.version>
<spring.version>5.1.2.RELEASE</spring.version>
</properties>
</project>

2
checker-plugin/pom.xml
View File

@ -3,9 +3,9 @@
<modelVersion>4.0.0</modelVersion>
<groupId>com.baeldung</groupId>
<artifactId>checker-plugin</artifactId>
<packaging>jar</packaging>
<version>1.0-SNAPSHOT</version>
<name>checker-plugin</name>
<packaging>jar</packaging>
<url>http://maven.apache.org</url>
<parent>

15
core-groovy/pom.xml
View File

@ -23,6 +23,12 @@
<groupId>org.codehaus.groovy</groupId>
<artifactId>groovy-all</artifactId>
<version>${groovy-all.version}</version>
<type>pom</type>
</dependency>
<dependency>
<groupId>org.codehaus.groovy</groupId>
<artifactId>groovy-dateutil</artifactId>
<version>${groovy.version}</version>
</dependency>
<dependency>
<groupId>org.codehaus.groovy</groupId>
@ -103,9 +109,12 @@
<properties>
<junit.platform.version>1.0.0</junit.platform.version>
<groovy.version>2.4.13</groovy.version>
<groovy-all.version>2.4.13</groovy-all.version>
<groovy-sql.version>2.4.13</groovy-sql.version>
<!-- <groovy.version>2.4.13</groovy.version> -->
<!-- <groovy-all.version>2.4.13</groovy-all.version> -->
<!-- <groovy-sql.version>2.4.13</groovy-sql.version> -->
<groovy.version>2.5.6</groovy.version>
<groovy-all.version>2.5.6</groovy-all.version>
<groovy-sql.version>2.5.6</groovy-sql.version>
<hsqldb.version>2.4.0</hsqldb.version>
<spock-core.version>1.1-groovy-2.4</spock-core.version>
<gmavenplus-plugin.version>1.6</gmavenplus-plugin.version>

107
core-groovy/src/main/groovy/com/baeldung/file/ReadFile.groovy Normal file
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@ -0,0 +1,107 @@
package com.baeldung.file
class ReadFile {
/**
* reads file content line by line using withReader and reader.readLine
* @param filePath
* @return
*/
int readFileLineByLine(String filePath) {
File file = new File(filePath)
def line, noOfLines = 0;
file.withReader { reader ->
while ((line = reader.readLine())!=null)
{
println "${line}"
noOfLines++
}
}
return noOfLines
}
/**
* reads file content in list of lines
* @param filePath
* @return
*/
List<String> readFileInList(String filePath) {
File file = new File(filePath)
def lines = file.readLines()
return lines
}
/**
* reads file content in string using File.text
* @param filePath
* @return
*/
String readFileString(String filePath) {
File file = new File(filePath)
String fileContent = file.text
return fileContent
}
/**
* reads file content in string with encoding using File.getText
* @param filePath
* @return
*/
String readFileStringWithCharset(String filePath) {
File file = new File(filePath)
String utf8Content = file.getText("UTF-8")
return utf8Content
}
/**
* reads content of binary file and returns byte array
* @param filePath
* @return
*/
byte[] readBinaryFile(String filePath) {
File file = new File(filePath)
byte[] binaryContent = file.bytes
return binaryContent
}
/**
* More Examples of reading a file
* @return
*/
def moreExamples() {
//with reader with utf-8
new File("src/main/resources/utf8Content.html").withReader('UTF-8') { reader ->
def line
while ((line = reader.readLine())!=null) {
println "${line}"
}
}
//collect api
def list = new File("src/main/resources/fileContent.txt").collect {it}
//as operator
def array = new File("src/main/resources/fileContent.txt") as String[]
//eachline
new File("src/main/resources/fileContent.txt").eachLine { line ->
println line
}
//newInputStream with eachLine
def is = new File("src/main/resources/fileContent.txt").newInputStream()
is.eachLine {
println it
}
is.close()
//withInputStream
new File("src/main/resources/fileContent.txt").withInputStream { stream ->
stream.eachLine { line ->
println line
}
}
}
}

43
core-groovy/src/main/groovy/com/baeldung/strings/Concatenate.groovy Normal file
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@ -0,0 +1,43 @@
package com.baeldung.strings;
class Concatenate {
String first = 'Hello'
String last = 'Groovy'
String doSimpleConcat() {
return 'My name is ' + first + ' ' + last
}
String doConcatUsingGString() {
return "My name is $first $last"
}
String doConcatUsingGStringClosures() {
return "My name is ${-> first} ${-> last}"
}
String doConcatUsingStringConcatMethod() {
return 'My name is '.concat(first).concat(' ').concat(last)
}
String doConcatUsingLeftShiftOperator() {
return 'My name is ' << first << ' ' << last
}
String doConcatUsingArrayJoinMethod() {
return ['My name is', first, last].join(' ')
}
String doConcatUsingArrayInjectMethod() {
return [first,' ', last]
.inject(new StringBuffer('My name is '), { initial, name -> initial.append(name); return initial }).toString()
}
String doConcatUsingStringBuilder() {
return new StringBuilder().append('My name is ').append(first).append(' ').append(last)
}
String doConcatUsingStringBuffer() {
return new StringBuffer().append('My name is ').append(first).append(' ').append(last)
}
}

8
core-groovy/src/main/groovy/com/baeldung/traits/AnimalTrait.groovy Normal file
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@ -0,0 +1,8 @@
package com.baeldung.traits
trait AnimalTrait {
String basicBehavior() {
return "Animalistic!!"
}
}

3
core-groovy/src/main/groovy/com/baeldung/traits/Car.groovy Normal file
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@ -0,0 +1,3 @@
package com.baeldung
class Car implements VehicleTrait {}

9
core-groovy/src/main/groovy/com/baeldung/traits/Dog.groovy Normal file
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@ -0,0 +1,9 @@
package com.baeldung.traits
class Dog implements WalkingTrait, SpeakingTrait {
String speakAndWalk() {
WalkingTrait.super.speakAndWalk()
}
}

12
core-groovy/src/main/groovy/com/baeldung/traits/Employee.groovy Normal file
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@ -0,0 +1,12 @@
package com.baeldung.traits
class Employee implements UserTrait {
String name() {
return 'Bob'
}
String lastName() {
return "Marley"
}
}

6
core-groovy/src/main/groovy/com/baeldung/traits/Human.groovy Normal file
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@ -0,0 +1,6 @@
package com.baeldung.traits
interface Human {
String lastName()
}

13
core-groovy/src/main/groovy/com/baeldung/traits/SpeakingTrait.groovy Normal file
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@ -0,0 +1,13 @@
package com.baeldung.traits
trait SpeakingTrait {
String basicAbility() {
return "Speaking!!"
}
String speakAndWalk() {
return "Speak and walk!!"
}
}

36
core-groovy/src/main/groovy/com/baeldung/traits/UserTrait.groovy Normal file
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@ -0,0 +1,36 @@
package com.baeldung.traits
trait UserTrait implements Human {
String sayHello() {
return "Hello!"
}
abstract String name()
String showName() {
return "Hello, ${name()}!"
}
private String greetingMessage() {
return 'Hello, from a private method!'
}
String greet() {
def msg = greetingMessage()
println msg
msg
}
def self() {
return this
}
String showLastName() {
return "Hello, ${lastName()}!"
}
String email
String address
}

9
core-groovy/src/main/groovy/com/baeldung/traits/VehicleTrait.groovy Normal file
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@ -0,0 +1,9 @@
package com.baeldung
trait VehicleTrait extends WheelTrait {
String showWheels() {
return "Num of Wheels $noOfWheels"
}
}

13
core-groovy/src/main/groovy/com/baeldung/traits/WalkingTrait.groovy Normal file
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@ -0,0 +1,13 @@
package com.baeldung.traits
trait WalkingTrait {
String basicAbility() {
return "Walking!!"
}
String speakAndWalk() {
return "Walk and speak!!"
}
}

7
core-groovy/src/main/groovy/com/baeldung/traits/WheelTrait.groovy Normal file
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@ -0,0 +1,7 @@
package com.baeldung
trait WheelTrait {
int noOfWheels
}

3
core-groovy/src/main/resources/fileContent.txt Normal file
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@ -0,0 +1,3 @@
Line 1 : Hello World!!!
Line 2 : This is a file content.
Line 3 : String content

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core-groovy/src/main/resources/sample.png Normal file
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After

Width:  |  Height:  |  Size: 329 B

12
core-groovy/src/main/resources/utf8Content.html Normal file
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@ -0,0 +1,12 @@
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<meta charset="UTF-8">
<body>
<pre>
ᚠᛇᚻ᛫ᛒᛦᚦ᛫ᚠᚱᚩᚠᚢᚱ᛫ᚠᛁᚱᚪ᛫ᚷᛖᚻᚹᛦᛚᚳᚢᛗ
ᛋᚳᛖᚪᛚ᛫ᚦᛖᚪᚻ᛫ᛗᚪᚾᚾᚪ᛫ᚷᛖᚻᚹᛦᛚᚳ᛫ᛗᛁᚳᛚᚢᚾ᛫ᚻᛦᛏ᛫ᛞᚫᛚᚪᚾ
ᚷᛁᚠ᛫ᚻᛖ᛫ᚹᛁᛚᛖ᛫ᚠᚩᚱ᛫ᛞᚱᛁᚻᛏᚾᛖ᛫ᛞᚩᛗᛖᛋ᛫ᚻᛚᛇᛏᚪᚾ
</pre>
</body>
</html>

57
core-groovy/src/test/groovy/com/baeldung/date/DateTest.groovy Normal file
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@ -0,0 +1,57 @@
package com.baeldung.groovy.sql
import static org.junit.Assert.*
import java.util.Calendar.*
import java.time.LocalDate
import java.text.SimpleDateFormat
import org.junit.Test
class DateTest {
def dateStr = "2019-02-28"
def pattern = "yyyy-MM-dd"
@Test
void whenGetStringRepresentation_thenCorrectlyConvertIntoDate() {
def dateFormat = new SimpleDateFormat(pattern)
def date = dateFormat.parse(dateStr)
println(" String to Date with DateFormatter : " + date)
def cal = new GregorianCalendar();
cal.setTime(date);
assertEquals(cal.get(Calendar.YEAR),2019)
assertEquals(cal.get(Calendar.DAY_OF_MONTH),28)
assertEquals(cal.get(Calendar.MONTH),java.util.Calendar.FEBRUARY)
}
@Test
void whenGetStringRepresentation_thenCorrectlyConvertWithDateUtilsExtension() {
def date = Date.parse(pattern, dateStr)
println(" String to Date with Date.parse : " + date)
def cal = new GregorianCalendar();
cal.setTime(date);
assertEquals(cal.get(Calendar.YEAR),2019)
assertEquals(cal.get(Calendar.DAY_OF_MONTH),28)
assertEquals(cal.get(Calendar.MONTH),java.util.Calendar.FEBRUARY)
}
@Test
void whenGetStringRepresentation_thenCorrectlyConvertIntoDateWithLocalDate() {
def date = LocalDate.parse(dateStr, pattern)
println(" String to Date with LocalDate : " + date)
assertEquals(date.getYear(),2019)
assertEquals(date.getMonth(),java.time.Month.FEBRUARY)
assertEquals(date.getDayOfMonth(),28)
}
}

70
core-groovy/src/test/groovy/com/baeldung/file/ReadFileUnitTest.groovy Normal file
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@ -0,0 +1,70 @@
package com.baeldung.file
import spock.lang.Specification
class ReadFileUnitTest extends Specification {
ReadFile readFile
void setup () {
readFile = new ReadFile()
}
def 'Should return number of lines in File using ReadFile.readFileLineByLine given filePath' () {
given:
def filePath = "src/main/resources/fileContent.txt"
when:
def noOfLines = readFile.readFileLineByLine(filePath)
then:
noOfLines
noOfLines instanceof Integer
assert noOfLines, 3
}
def 'Should return File Content in list of lines using ReadFile.readFileInList given filePath' () {
given:
def filePath = "src/main/resources/fileContent.txt"
when:
def lines = readFile.readFileInList(filePath)
then:
lines
lines instanceof List<String>
assert lines.size(), 3
}
def 'Should return file content in string using ReadFile.readFileString given filePath' () {
given:
def filePath = "src/main/resources/fileContent.txt"
when:
def fileContent = readFile.readFileString(filePath)
then:
fileContent
fileContent instanceof String
fileContent.contains("""Line 1 : Hello World!!!
Line 2 : This is a file content.
Line 3 : String content""")
}
def 'Should return UTF-8 encoded file content in string using ReadFile.readFileStringWithCharset given filePath' () {
given:
def filePath = "src/main/resources/utf8Content.html"
when:
def encodedContent = readFile.readFileStringWithCharset(filePath)
then:
encodedContent
encodedContent instanceof String
}
def 'Should return binary file content in byte array using ReadFile.readBinaryFile given filePath' () {
given:
def filePath = "src/main/resources/sample.png"
when:
def binaryContent = readFile.readBinaryFile(filePath)
then:
binaryContent
binaryContent instanceof byte[]
binaryContent.length == 329
}
}

85
core-groovy/src/test/groovy/com/baeldung/map/MapUnitTest.groovy Normal file
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@ -0,0 +1,85 @@
package com.baeldung.map
import static org.junit.Assert.*
import org.junit.Test
class MapUnitTest {
@Test
void whenUsingEach_thenMapIsIterated() {
def map = [
'FF0000' : 'Red',
'00FF00' : 'Lime',
'0000FF' : 'Blue',
'FFFF00' : 'Yellow'
]
map.each { println "Hex Code: $it.key = Color Name: $it.value" }
}
@Test
void whenUsingEachWithEntry_thenMapIsIterated() {
def map = [
'E6E6FA' : 'Lavender',
'D8BFD8' : 'Thistle',
'DDA0DD' : 'Plum',
]
map.each { entry -> println "Hex Code: $entry.key = Color Name: $entry.value" }
}
@Test
void whenUsingEachWithKeyAndValue_thenMapIsIterated() {
def map = [
'000000' : 'Black',
'FFFFFF' : 'White',
'808080' : 'Gray'
]
map.each { key, val ->
println "Hex Code: $key = Color Name $val"
}
}
@Test
void whenUsingEachWithIndexAndEntry_thenMapIsIterated() {
def map = [
'800080' : 'Purple',
'4B0082' : 'Indigo',
'6A5ACD' : 'Slate Blue'
]
map.eachWithIndex { entry, index ->
def indent = ((index == 0 || index % 2 == 0) ? " " : "")
println "$indent Hex Code: $entry.key = Color Name: $entry.value"
}
}
@Test
void whenUsingEachWithIndexAndKeyAndValue_thenMapIsIterated() {
def map = [
'FFA07A' : 'Light Salmon',
'FF7F50' : 'Coral',
'FF6347' : 'Tomato',
'FF4500' : 'Orange Red'
]
map.eachWithIndex { key, val, index ->
def indent = ((index == 0 || index % 2 == 0) ? " " : "")
println "$indent Hex Code: $key = Color Name: $val"
}
}
@Test
void whenUsingForLoop_thenMapIsIterated() {
def map = [
'2E8B57' : 'Seagreen',
'228B22' : 'Forest Green',
'008000' : 'Green'
]
for (entry in map) {
println "Hex Code: $entry.key = Color Name: $entry.value"
}
}
}

101
core-groovy/src/test/groovy/com/baeldung/strings/ConcatenateTest.groovy Normal file
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@ -0,0 +1,101 @@
import com.baeldung.strings.Concatenate;
class ConcatenateTest extends GroovyTestCase {
void testSimpleConcat() {
def name = new Concatenate()
name.first = 'Joe';
name.last = 'Smith';
def expected = 'My name is Joe Smith'
assertToString(name.doSimpleConcat(), expected)
}
void testConcatUsingGString() {
def name = new Concatenate()
name.first = "Joe";
name.last = "Smith";
def expected = "My name is Joe Smith"
assertToString(name.doConcatUsingGString(), expected)
}
void testConcatUsingGStringClosures() {
def name = new Concatenate()
name.first = "Joe";
name.last = "Smith";
def expected = "My name is Joe Smith"
assertToString(name.doConcatUsingGStringClosures(), expected)
}
void testConcatUsingStringConcatMethod() {
def name = new Concatenate()
name.first = "Joe";
name.last = "Smith";
def expected = "My name is Joe Smith"
assertToString(name.doConcatUsingStringConcatMethod(), expected)
}
void testConcatUsingLeftShiftOperator() {
def name = new Concatenate()
name.first = "Joe";
name.last = "Smith";
def expected = "My name is Joe Smith"
assertToString(name.doConcatUsingLeftShiftOperator(), expected)
}
void testConcatUsingArrayJoinMethod() {
def name = new Concatenate()
name.first = "Joe";
name.last = "Smith";
def expected = "My name is Joe Smith"
assertToString(name.doConcatUsingArrayJoinMethod(), expected)
}
void testConcatUsingArrayInjectMethod() {
def name = new Concatenate()
name.first = "Joe";
name.last = "Smith";
def expected = "My name is Joe Smith"
assertToString(name.doConcatUsingArrayInjectMethod(), expected)
}
void testConcatUsingStringBuilder() {
def name = new Concatenate()
name.first = "Joe";
name.last = "Smith";
def expected = "My name is Joe Smith"
assertToString(name.doConcatUsingStringBuilder(), expected)
}
void testConcatUsingStringBuffer() {
def name = new Concatenate()
name.first = "Joe";
name.last = "Smith";
def expected = "My name is Joe Smith"
assertToString(name.doConcatUsingStringBuffer(), expected)
}
void testConcatMultilineUsingStringConcatMethod() {
def name = new Concatenate()
name.first = '''Joe
Smith
''';
name.last = 'Junior';
def expected = '''My name is Joe
Smith
Junior''';
assertToString(name.doConcatUsingStringConcatMethod(), expected)
}
void testGStringvsClosure(){
def first = "Joe";
def last = "Smith";
def eagerGString = "My name is $first $last"
def lazyGString = "My name is ${-> first} ${-> last}"
assert eagerGString == "My name is Joe Smith"
assert lazyGString == "My name is Joe Smith"
first = "David";
assert eagerGString == "My name is Joe Smith"
assert lazyGString == "My name is David Smith"
}
}

19
core-groovy/src/test/groovy/com/baeldung/stringtypes/CharacterInGroovy.groovy Normal file
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@ -0,0 +1,19 @@
package groovy.com.baeldung.stringtypes
import org.junit.Assert
import org.junit.Test
class CharacterInGroovy {
@Test
void 'character'() {
char a = 'A' as char
char b = 'B' as char
char c = (char) 'C'
Assert.assertTrue(a instanceof Character)
Assert.assertTrue(b instanceof Character)
Assert.assertTrue(c instanceof Character)
}
}

24
core-groovy/src/test/groovy/com/baeldung/stringtypes/DollarSlashyString.groovy Normal file
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@ -0,0 +1,24 @@
package groovy.com.baeldung.stringtypes
import org.junit.Test
class DollarSlashyString {
@Test
void 'dollar slashy string'() {
def name = "John"
def dollarSlashy = $/
Hello $name!,
I can show you $ sign or escaped dollar sign: $$
Both slashes works: \ or /, but we can still escape it: $/
We have to escape opening and closing delimiter:
- $$$/
- $/$$
/$
print(dollarSlashy)
}
}

67
core-groovy/src/test/groovy/com/baeldung/stringtypes/DoubleQuotedString.groovy Normal file
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@ -0,0 +1,67 @@
package groovy.com.baeldung.stringtypes
import org.junit.Assert
import org.junit.Test
class DoubleQuotedString {
@Test
void 'escape double quoted string'() {
def example = "Hello \"world\"!"
println(example)
}
@Test
void 'String ang GString'() {
def string = "example"
def stringWithExpression = "example${2}"
Assert.assertTrue(string instanceof String)
Assert.assertTrue(stringWithExpression instanceof GString)
Assert.assertTrue(stringWithExpression.toString() instanceof String)
}
@Test
void 'placeholder with variable'() {
def name = "John"
def helloName = "Hello $name!".toString()
Assert.assertEquals("Hello John!", helloName)
}
@Test
void 'placeholder with expression'() {
def result = "result is ${2 * 2}".toString()
Assert.assertEquals("result is 4", result)
}
@Test
void 'placeholder with dotted access'() {
def person = [name: 'John']
def myNameIs = "I'm $person.name, and you?".toString()
Assert.assertEquals("I'm John, and you?", myNameIs)
}
@Test
void 'placeholder with method call'() {
def name = 'John'
def result = "Uppercase name: ${name.toUpperCase()}".toString()
Assert.assertEquals("Uppercase name: JOHN", result)
}
@Test
void 'GString and String hashcode'() {
def string = "2+2 is 4"
def gstring = "2+2 is ${4}"
Assert.assertTrue(string.hashCode() != gstring.hashCode())
}
}

15
core-groovy/src/test/groovy/com/baeldung/stringtypes/SingleQuotedString.groovy Normal file
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@ -0,0 +1,15 @@
package groovy.com.baeldung.stringtypes
import org.junit.Assert
import org.junit.Test
class SingleQuotedString {
@Test
void 'single quoted string'() {
def example = 'Hello world'
Assert.assertEquals('Hello world!', 'Hello' + ' world!')
}
}

31
core-groovy/src/test/groovy/com/baeldung/stringtypes/SlashyString.groovy Normal file
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@ -0,0 +1,31 @@
package groovy.com.baeldung.stringtypes
import org.junit.Assert
import org.junit.Test
class SlashyString {
@Test
void 'slashy string'() {
def pattern = /.*foobar.*\/hello.*/
Assert.assertTrue("I'm matching foobar /hello regexp pattern".matches(pattern))
}
void 'wont compile'() {
// if ('' == //) {
// println("I can't compile")
// }
}
@Test
void 'interpolate and multiline'() {
def name = 'John'
def example = /
Hello $name
second line
/
}
}

26
core-groovy/src/test/groovy/com/baeldung/stringtypes/Strings.groovy Normal file
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@ -0,0 +1,26 @@
package groovy.com.baeldung.stringtypes
import org.junit.Assert
import org.junit.Test
class Strings {
@Test
void 'string interpolation '() {
def name = "Kacper"
def result = "Hello ${name}!"
Assert.assertEquals("Hello Kacper!", result.toString())
}
@Test
void 'string concatenation'() {
def first = "first"
def second = "second"
def concatenation = first + second
Assert.assertEquals("firstsecond", concatenation)
}
}

19
core-groovy/src/test/groovy/com/baeldung/stringtypes/TripleDoubleQuotedString.groovy Normal file
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@ -0,0 +1,19 @@
package groovy.com.baeldung.stringtypes
import org.junit.Test
class TripleDoubleQuotedString {
@Test
void 'triple-quoted strings with interpolation'() {
def name = "John"
def multiLine = """
I'm $name.
"This is quotation"
"""
println(multiLine)
}
}

67
core-groovy/src/test/groovy/com/baeldung/stringtypes/TripleSingleQuotedString.groovy Normal file
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@ -0,0 +1,67 @@
package groovy.com.baeldung.stringtypes
import org.junit.Assert
import org.junit.Test
class TripleSingleQuotedString {
def 'formatted json'() {
def jsonContent = '''
{
"name": "John",
"age": 20,
"birthDate": null
}
'''
}
def 'triple single quoted'() {
def triple = '''im triple single quoted string'''
}
@Test
void 'triple single quoted with multiline string'() {
def triple = '''
firstline
secondline
'''
Assert.assertTrue(triple.startsWith("\n"))
}
@Test
void 'triple single quoted with multiline string with stripIndent() and removing newline characters'() {
def triple = '''\
firstline
secondline'''.stripIndent()
Assert.assertEquals("firstline\nsecondline", triple)
}
@Test
void 'triple single quoted with multiline string with last line with only whitespaces'() {
def triple = '''\
firstline
secondline\
'''.stripIndent()
println(triple)
}
@Test
void 'triple single quoted with multiline string with stripMargin(Character) and removing newline characters'() {
def triple = '''\
|firstline
|secondline'''.stripMargin()
println(triple)
}
@Test
void 'striple single quoted with special characters'() {
def specialCharacters = '''hello \'John\'. This is backslash - \\. \nSecond line starts here'''
println(specialCharacters)
}
}

114
core-groovy/src/test/groovy/com/baeldung/traits/TraitsUnitTest.groovy Normal file
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@ -0,0 +1,114 @@
package com.baeldung.traits
import spock.lang.Specification
class TraitsUnitTest extends Specification {
Employee employee
Dog dog
void setup () {
employee = new Employee()
dog = new Dog()
}
def 'Should return msg string when using Employee.sayHello method provided by UserTrait' () {
when:
def msg = employee.sayHello()
then:
msg
msg instanceof String
assert msg == "Hello!"
}
def 'Should return displayMsg string when using Employee.showName method' () {
when:
def displayMsg = employee.showName()
then:
displayMsg
displayMsg instanceof String
assert displayMsg == "Hello, Bob!"
}
def 'Should return greetMsg string when using Employee.greet method' () {
when:
def greetMsg = employee.greet()
then:
greetMsg
greetMsg instanceof String
assert greetMsg == "Hello, from a private method!"
}
def 'Should return MissingMethodException when using Employee.greetingMessage method' () {
when:
def exception
try {
employee.greetingMessage()
}catch(Exception e) {
exception = e
}
then:
exception
exception instanceof groovy.lang.MissingMethodException
assert exception.message == "No signature of method: com.baeldung.traits.Employee.greetingMessage()"+
" is applicable for argument types: () values: []"
}
def 'Should return employee instance when using Employee.whoAmI method' () {
when:
def emp = employee.self()
then:
emp
emp instanceof Employee
assert emp.is(employee)
}
def 'Should display lastName when using Employee.showLastName method' () {
when:
def lastNameMsg = employee.showLastName()
then:
lastNameMsg
lastNameMsg instanceof String
assert lastNameMsg == "Hello, Marley!"
}
def 'Should be able to define properties of UserTrait in Employee instance' () {
when:
employee = new Employee(email: "a@e.com", address: "baeldung.com")
then:
employee
employee instanceof Employee
assert employee.email == "a@e.com"
assert employee.address == "baeldung.com"
}
def 'Should execute basicAbility method from SpeakingTrait and return msg string' () {
when:
def speakMsg = dog.basicAbility()
then:
speakMsg
speakMsg instanceof String
assert speakMsg == "Speaking!!"
}
def 'Should verify multiple inheritance with traits and execute overridden traits method' () {
when:
def walkSpeakMsg = dog.speakAndWalk()
println walkSpeakMsg
then:
walkSpeakMsg
walkSpeakMsg instanceof String
assert walkSpeakMsg == "Walk and speak!!"
}
def 'Should implement AnimalTrait at runtime and access basicBehavior method' () {
when:
def dogInstance = new Dog() as AnimalTrait
def basicBehaviorMsg = dogInstance.basicBehavior()
then:
basicBehaviorMsg
basicBehaviorMsg instanceof String
assert basicBehaviorMsg == "Animalistic!!"
}
}

2
core-java-10/pom.xml
View File

@ -3,9 +3,9 @@
<modelVersion>4.0.0</modelVersion>
<groupId>com.baeldung</groupId>
<artifactId>core-java-10</artifactId>
<packaging>jar</packaging>
<version>0.1.0-SNAPSHOT</version>
<name>core-java-10</name>
<packaging>jar</packaging>
<url>http://maven.apache.org</url>
<parent>

1
core-java-11/README.md
View File

@ -3,3 +3,4 @@
- [Java 11 Single File Source Code](https://www.baeldung.com/java-single-file-source-code)
- [Java 11 Local Variable Syntax for Lambda Parameters](https://www.baeldung.com/java-var-lambda-params)
- [Java 11 String API Additions](https://www.baeldung.com/java-11-string-api)
- [Java 11 Nest Based Access Control](https://www.baeldung.com/java-nest-based-access-control)

2
core-java-11/pom.xml
View File

@ -3,9 +3,9 @@
<modelVersion>4.0.0</modelVersion>
<groupId>com.baeldung</groupId>
<artifactId>core-java-11</artifactId>
<packaging>jar</packaging>
<version>0.1.0-SNAPSHOT</version>
<name>core-java-11</name>
<packaging>jar</packaging>
<url>http://maven.apache.org</url>
<parent>

18
core-java-11/src/main/java/com/baeldung/epsilongc/MemoryPolluter.java Normal file
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@ -0,0 +1,18 @@
package com.baeldung.epsilongc;
public class MemoryPolluter {
private static final int MEGABYTE_IN_BYTES = 1024 * 1024;
private static final int ITERATION_COUNT = 1024 * 10;
public static void main(String[] args) {
System.out.println("Starting pollution");
for (int i = 0; i < ITERATION_COUNT; i++) {
byte[] array = new byte[MEGABYTE_IN_BYTES];
}
System.out.println("Terminating");
}
}

132
core-java-11/src/main/java/com/baeldung/java11/httpclient/HttpClientExample.java Normal file
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@ -0,0 +1,132 @@
/*
* To change this license header, choose License Headers in Project Properties.
* To change this template file, choose Tools | Templates
* and open the template in the editor.
*/
package com.baeldung.java11.httpclient;
import java.io.IOException;
import java.net.URI;
import java.net.URISyntaxException;
import java.net.http.HttpClient;
import java.net.http.HttpClient.Version;
import java.net.http.HttpRequest;
import java.net.http.HttpRequest.BodyPublishers;
import java.net.http.HttpResponse;
import java.net.http.HttpResponse.BodyHandlers;
import java.net.http.HttpResponse.PushPromiseHandler;
import java.util.Arrays;
import java.util.List;
import java.util.concurrent.CompletableFuture;
import java.util.function.Function;
import java.util.stream.Collectors;
public class HttpClientExample {
public static void main(String[] args) throws Exception {
httpGetRequest();
httpPostRequest();
asynchronousGetRequest();
asynchronousMultipleRequests();
pushRequest();
}
public static void httpGetRequest() throws URISyntaxException, IOException, InterruptedException {
HttpClient client = HttpClient.newHttpClient();
HttpRequest request = HttpRequest.newBuilder()
.version(HttpClient.Version.HTTP_2)
.uri(URI.create("http://jsonplaceholder.typicode.com/posts/1"))
.headers("Accept-Enconding", "gzip, deflate")
.build();
HttpResponse<String> response = client.send(request, BodyHandlers.ofString());
String responseBody = response.body();
int responseStatusCode = response.statusCode();
System.out.println("httpGetRequest: " + responseBody);
System.out.println("httpGetRequest status code: " + responseStatusCode);
}
public static void httpPostRequest() throws URISyntaxException, IOException, InterruptedException {
HttpClient client = HttpClient.newBuilder()
.version(HttpClient.Version.HTTP_2)
.build();
HttpRequest request = HttpRequest.newBuilder(new URI("http://jsonplaceholder.typicode.com/posts"))
.version(HttpClient.Version.HTTP_2)
.POST(BodyPublishers.ofString("Sample Post Request"))
.build();
HttpResponse<String> response = client.send(request, BodyHandlers.ofString());
String responseBody = response.body();
System.out.println("httpPostRequest : " + responseBody);
}
public static void asynchronousGetRequest() throws URISyntaxException {
HttpClient client = HttpClient.newHttpClient();
URI httpURI = new URI("http://jsonplaceholder.typicode.com/posts/1");
HttpRequest request = HttpRequest.newBuilder(httpURI)
.version(HttpClient.Version.HTTP_2)
.build();
CompletableFuture<Void> futureResponse = client.sendAsync(request, HttpResponse.BodyHandlers.ofString())
.thenAccept(resp -> {
System.out.println("Got pushed response " + resp.uri());
System.out.println("Response statuscode: " + resp.statusCode());
System.out.println("Response body: " + resp.body());
});
System.out.println("futureResponse" + futureResponse);
}
public static void asynchronousMultipleRequests() throws URISyntaxException {
HttpClient client = HttpClient.newHttpClient();
List<URI> uris = Arrays.asList(new URI("http://jsonplaceholder.typicode.com/posts/1"), new URI("http://jsonplaceholder.typicode.com/posts/2"));
List<HttpRequest> requests = uris.stream()
.map(HttpRequest::newBuilder)
.map(reqBuilder -> reqBuilder.build())
.collect(Collectors.toList());
System.out.println("Got pushed response1 " + requests);
CompletableFuture.allOf(requests.stream()
.map(request -> client.sendAsync(request, BodyHandlers.ofString()))
.toArray(CompletableFuture<?>[]::new))
.thenAccept(System.out::println)
.join();
}
public static void pushRequest() throws URISyntaxException, InterruptedException {
System.out.println("Running HTTP/2 Server Push example...");
HttpClient httpClient = HttpClient.newBuilder()
.version(Version.HTTP_2)
.build();
HttpRequest pageRequest = HttpRequest.newBuilder()
.uri(URI.create("https://http2.golang.org/serverpush"))
.build();
// Interface HttpResponse.PushPromiseHandler<T>
// void applyPushPromise​(HttpRequest initiatingRequest, HttpRequest pushPromiseRequest, Function<HttpResponse.BodyHandler<T>,​CompletableFuture<HttpResponse<T>>> acceptor)
httpClient.sendAsync(pageRequest, BodyHandlers.ofString(), pushPromiseHandler())
.thenAccept(pageResponse -> {
System.out.println("Page response status code: " + pageResponse.statusCode());
System.out.println("Page response headers: " + pageResponse.headers());
String responseBody = pageResponse.body();
System.out.println(responseBody);
}).join();
Thread.sleep(1000); // waiting for full response
}
private static PushPromiseHandler<String> pushPromiseHandler() {
return (HttpRequest initiatingRequest,
HttpRequest pushPromiseRequest,
Function<HttpResponse.BodyHandler<String>,
CompletableFuture<HttpResponse<String>>> acceptor) -> {
acceptor.apply(BodyHandlers.ofString())
.thenAccept(resp -> {
System.out.println(" Pushed response: " + resp.uri() + ", headers: " + resp.headers());
});
System.out.println("Promise request: " + pushPromiseRequest.uri());
System.out.println("Promise request: " + pushPromiseRequest.headers());
};
}
}

240
core-java-11/src/test/java/com/baeldung/java11/httpclient/test/HttpClientTest.java Normal file
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@ -0,0 +1,240 @@
package com.baeldung.java11.httpclient.test;
import static org.hamcrest.CoreMatchers.containsString;
import static org.hamcrest.CoreMatchers.equalTo;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertThat;
import static org.junit.Assert.assertTrue;
import static org.junit.Assert.fail;
import java.io.IOException;
import java.net.Authenticator;
import java.net.CookieManager;
import java.net.CookiePolicy;
import java.net.HttpURLConnection;
import java.net.PasswordAuthentication;
import java.net.ProxySelector;
import java.net.URI;
import java.net.URISyntaxException;
import java.net.http.HttpClient;
import java.net.http.HttpRequest;
import java.net.http.HttpResponse;
import java.net.http.HttpResponse.BodyHandlers;
import java.util.Arrays;
import java.util.List;
import java.util.concurrent.CompletableFuture;
import java.util.concurrent.CompletionException;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.TimeUnit;
import java.util.stream.Collectors;
import org.junit.jupiter.api.Test;
public class HttpClientTest {
@Test
public void shouldReturnSampleDataContentWhenConnectViaSystemProxy() throws IOException, InterruptedException, URISyntaxException {
HttpRequest request = HttpRequest.newBuilder()
.uri(new URI("https://postman-echo.com/post"))
.headers("Content-Type", "text/plain;charset=UTF-8")
.POST(HttpRequest.BodyPublishers.ofString("Sample body"))
.build();
HttpResponse<String> response = HttpClient.newBuilder()
.proxy(ProxySelector.getDefault())
.build()
.send(request, HttpResponse.BodyHandlers.ofString());
assertThat(response.statusCode(), equalTo(HttpURLConnection.HTTP_OK));
assertThat(response.body(), containsString("Sample body"));
}
@Test
public void shouldNotFollowRedirectWhenSetToDefaultNever() throws IOException, InterruptedException, URISyntaxException {
HttpRequest request = HttpRequest.newBuilder()
.uri(new URI("http://stackoverflow.com"))
.version(HttpClient.Version.HTTP_1_1)
.GET()
.build();
HttpResponse<String> response = HttpClient.newBuilder()
.build()
.send(request, HttpResponse.BodyHandlers.ofString());
assertThat(response.statusCode(), equalTo(HttpURLConnection.HTTP_MOVED_PERM));
assertThat(response.body(), containsString("https://stackoverflow.com/"));
}
@Test
public void shouldFollowRedirectWhenSetToAlways() throws IOException, InterruptedException, URISyntaxException {
HttpRequest request = HttpRequest.newBuilder()
.uri(new URI("http://stackoverflow.com"))
.version(HttpClient.Version.HTTP_1_1)
.GET()
.build();
HttpResponse<String> response = HttpClient.newBuilder()
.followRedirects(HttpClient.Redirect.ALWAYS)
.build()
.send(request, HttpResponse.BodyHandlers.ofString());
assertThat(response.statusCode(), equalTo(HttpURLConnection.HTTP_OK));
assertThat(response.request()
.uri()
.toString(), equalTo("https://stackoverflow.com/"));
}
@Test
public void shouldReturnOKStatusForAuthenticatedAccess() throws URISyntaxException, IOException, InterruptedException {
HttpRequest request = HttpRequest.newBuilder()
.uri(new URI("https://postman-echo.com/basic-auth"))
.GET()
.build();
HttpResponse<String> response = HttpClient.newBuilder()
.authenticator(new Authenticator() {
@Override
protected PasswordAuthentication getPasswordAuthentication() {
return new PasswordAuthentication("postman", "password".toCharArray());
}
})
.build()
.send(request, HttpResponse.BodyHandlers.ofString());
assertThat(response.statusCode(), equalTo(HttpURLConnection.HTTP_OK));
}
@Test
public void shouldSendRequestAsync() throws URISyntaxException, InterruptedException, ExecutionException {
HttpRequest request = HttpRequest.newBuilder()
.uri(new URI("https://postman-echo.com/post"))
.headers("Content-Type", "text/plain;charset=UTF-8")
.POST(HttpRequest.BodyPublishers.ofString("Sample body"))
.build();
CompletableFuture<HttpResponse<String>> response = HttpClient.newBuilder()
.build()
.sendAsync(request, HttpResponse.BodyHandlers.ofString());
assertThat(response.get()
.statusCode(), equalTo(HttpURLConnection.HTTP_OK));
}
@Test
public void shouldUseJustTwoThreadWhenProcessingSendAsyncRequest() throws URISyntaxException, InterruptedException, ExecutionException {
HttpRequest request = HttpRequest.newBuilder()
.uri(new URI("https://postman-echo.com/get"))
.GET()
.build();
ExecutorService executorService = Executors.newFixedThreadPool(2);
CompletableFuture<HttpResponse<String>> response1 = HttpClient.newBuilder()
.executor(executorService)
.build()
.sendAsync(request, HttpResponse.BodyHandlers.ofString());
CompletableFuture<HttpResponse<String>> response2 = HttpClient.newBuilder()
.executor(executorService)
.build()
.sendAsync(request, HttpResponse.BodyHandlers.ofString());
CompletableFuture<HttpResponse<String>> response3 = HttpClient.newBuilder()
.executor(executorService)
.build()
.sendAsync(request, HttpResponse.BodyHandlers.ofString());
CompletableFuture.allOf(response1, response2, response3)
.join();
assertThat(response1.get()
.statusCode(), equalTo(HttpURLConnection.HTTP_OK));
assertThat(response2.get()
.statusCode(), equalTo(HttpURLConnection.HTTP_OK));
assertThat(response3.get()
.statusCode(), equalTo(HttpURLConnection.HTTP_OK));
}
@Test
public void shouldNotStoreCookieWhenPolicyAcceptNone() throws URISyntaxException, IOException, InterruptedException {
HttpRequest request = HttpRequest.newBuilder()
.uri(new URI("https://postman-echo.com/get"))
.GET()
.build();
HttpClient httpClient = HttpClient.newBuilder()
.cookieHandler(new CookieManager(null, CookiePolicy.ACCEPT_NONE))
.build();
httpClient.send(request, HttpResponse.BodyHandlers.ofString());
assertTrue(httpClient.cookieHandler()
.isPresent());
}
@Test
public void shouldStoreCookieWhenPolicyAcceptAll() throws URISyntaxException, IOException, InterruptedException {
HttpRequest request = HttpRequest.newBuilder()
.uri(new URI("https://postman-echo.com/get"))
.GET()
.build();
HttpClient httpClient = HttpClient.newBuilder()
.cookieHandler(new CookieManager(null, CookiePolicy.ACCEPT_ALL))
.build();
httpClient.send(request, HttpResponse.BodyHandlers.ofString());
assertTrue(httpClient.cookieHandler()
.isPresent());
}
@Test
public void shouldProcessMultipleRequestViaStream() throws URISyntaxException, ExecutionException, InterruptedException {
List<URI> targets = Arrays.asList(new URI("https://postman-echo.com/get?foo1=bar1"), new URI("https://postman-echo.com/get?foo2=bar2"));
HttpClient client = HttpClient.newHttpClient();
List<CompletableFuture<String>> futures = targets.stream()
.map(target -> client.sendAsync(HttpRequest.newBuilder(target)
.GET()
.build(), HttpResponse.BodyHandlers.ofString())
.thenApply(response -> response.body()))
.collect(Collectors.toList());
CompletableFuture.allOf(futures.toArray(new CompletableFuture[0]))
.join();
if (futures.get(0)
.get()
.contains("foo1")) {
assertThat(futures.get(0)
.get(), containsString("bar1"));
assertThat(futures.get(1)
.get(), containsString("bar2"));
} else {
assertThat(futures.get(1)
.get(), containsString("bar2"));
assertThat(futures.get(1)
.get(), containsString("bar1"));
}
}
@Test
public void completeExceptionallyExample() {
CompletableFuture<String> cf = CompletableFuture.completedFuture("message").thenApplyAsync(String::toUpperCase,
CompletableFuture.delayedExecutor(1, TimeUnit.SECONDS));
CompletableFuture<String> exceptionHandler = cf.handle((s, th) -> { return (th != null) ? "message upon cancel" : ""; });
cf.completeExceptionally(new RuntimeException("completed exceptionally"));
assertTrue("Was not completed exceptionally", cf.isCompletedExceptionally());
try {
cf.join();
fail("Should have thrown an exception");
} catch (CompletionException ex) { // just for testing
assertEquals("completed exceptionally", ex.getCause().getMessage());
}
assertEquals("message upon cancel", exceptionHandler.join());
}
}

168
core-java-11/src/test/java/com/baeldung/java11/httpclient/test/HttpRequestTest.java Normal file
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@ -0,0 +1,168 @@
package com.baeldung.java11.httpclient.test;
import static java.time.temporal.ChronoUnit.SECONDS;
import static org.hamcrest.CoreMatchers.containsString;
import static org.hamcrest.CoreMatchers.equalTo;
import static org.junit.Assert.assertThat;
import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.net.HttpURLConnection;
import java.net.URI;
import java.net.URISyntaxException;
import java.net.http.HttpClient;
import java.net.http.HttpRequest;
import java.net.http.HttpResponse;
import java.nio.file.Paths;
import java.security.NoSuchAlgorithmException;
import java.time.Duration;
import org.junit.Test;
public class HttpRequestTest {
@Test
public void shouldReturnStatusOKWhenSendGetRequest() throws IOException, InterruptedException, URISyntaxException {
HttpRequest request = HttpRequest.newBuilder()
.uri(new URI("https://postman-echo.com/get"))
.GET()
.build();
HttpResponse<String> response = HttpClient.newHttpClient()
.send(request, HttpResponse.BodyHandlers.ofString());
assertThat(response.statusCode(), equalTo(HttpURLConnection.HTTP_OK));
}
@Test
public void shouldUseHttp2WhenWebsiteUsesHttp2() throws IOException, InterruptedException, URISyntaxException {
HttpRequest request = HttpRequest.newBuilder()
.uri(new URI("https://stackoverflow.com"))
.version(HttpClient.Version.HTTP_2)
.GET()
.build();
HttpResponse<String> response = HttpClient.newHttpClient()
.send(request, HttpResponse.BodyHandlers.ofString());
assertThat(response.statusCode(), equalTo(HttpURLConnection.HTTP_OK));
assertThat(response.version(), equalTo(HttpClient.Version.HTTP_2));
}
@Test
public void shouldFallbackToHttp1_1WhenWebsiteDoesNotUseHttp2() throws IOException, InterruptedException, URISyntaxException, NoSuchAlgorithmException {
HttpRequest request = HttpRequest.newBuilder()
.uri(new URI("https://postman-echo.com/get"))
.version(HttpClient.Version.HTTP_2)
.GET()
.build();
HttpResponse<String> response = HttpClient.newHttpClient()
.send(request, HttpResponse.BodyHandlers.ofString());
assertThat(response.version(), equalTo(HttpClient.Version.HTTP_1_1));
}
@Test
public void shouldReturnStatusOKWhenSendGetRequestWithDummyHeaders() throws IOException, InterruptedException, URISyntaxException {
HttpRequest request = HttpRequest.newBuilder()
.uri(new URI("https://postman-echo.com/get"))
.headers("key1", "value1", "key2", "value2")
.GET()
.build();
HttpResponse<String> response = HttpClient.newHttpClient()
.send(request, HttpResponse.BodyHandlers.ofString());
assertThat(response.statusCode(), equalTo(HttpURLConnection.HTTP_OK));
}
@Test
public void shouldReturnStatusOKWhenSendGetRequestTimeoutSet() throws IOException, InterruptedException, URISyntaxException {
HttpRequest request = HttpRequest.newBuilder()
.uri(new URI("https://postman-echo.com/get"))
.timeout(Duration.of(10, SECONDS))
.GET()
.build();
HttpResponse<String> response = HttpClient.newHttpClient()
.send(request, HttpResponse.BodyHandlers.ofString());
assertThat(response.statusCode(), equalTo(HttpURLConnection.HTTP_OK));
}
@Test
public void shouldReturnNoContentWhenPostWithNoBody() throws IOException, InterruptedException, URISyntaxException {
HttpRequest request = HttpRequest.newBuilder()
.uri(new URI("https://postman-echo.com/post"))
.POST(HttpRequest.BodyPublishers.noBody())
.build();
HttpResponse<String> response = HttpClient.newHttpClient()
.send(request, HttpResponse.BodyHandlers.ofString());
assertThat(response.statusCode(), equalTo(HttpURLConnection.HTTP_OK));
}
@Test
public void shouldReturnSampleDataContentWhenPostWithBodyText() throws IOException, InterruptedException, URISyntaxException {
HttpRequest request = HttpRequest.newBuilder()
.uri(new URI("https://postman-echo.com/post"))
.headers("Content-Type", "text/plain;charset=UTF-8")
.POST(HttpRequest.BodyPublishers.ofString("Sample request body"))
.build();
HttpResponse<String> response = HttpClient.newHttpClient()
.send(request, HttpResponse.BodyHandlers.ofString());
assertThat(response.statusCode(), equalTo(HttpURLConnection.HTTP_OK));
assertThat(response.body(), containsString("Sample request body"));
}
@Test
public void shouldReturnSampleDataContentWhenPostWithInputStream() throws IOException, InterruptedException, URISyntaxException {
byte[] sampleData = "Sample request body".getBytes();
HttpRequest request = HttpRequest.newBuilder()
.uri(new URI("https://postman-echo.com/post"))
.headers("Content-Type", "text/plain;charset=UTF-8")
.POST(HttpRequest.BodyPublishers.ofInputStream(() -> new ByteArrayInputStream(sampleData)))
.build();
HttpResponse<String> response = HttpClient.newHttpClient()
.send(request, HttpResponse.BodyHandlers.ofString());
assertThat(response.statusCode(), equalTo(HttpURLConnection.HTTP_OK));
assertThat(response.body(), containsString("Sample request body"));
}
@Test
public void shouldReturnSampleDataContentWhenPostWithByteArrayProcessorStream() throws IOException, InterruptedException, URISyntaxException {
byte[] sampleData = "Sample request body".getBytes();
HttpRequest request = HttpRequest.newBuilder()
.uri(new URI("https://postman-echo.com/post"))
.headers("Content-Type", "text/plain;charset=UTF-8")
.POST(HttpRequest.BodyPublishers.ofByteArray(sampleData))
.build();
HttpResponse<String> response = HttpClient.newHttpClient()
.send(request, HttpResponse.BodyHandlers.ofString());
assertThat(response.statusCode(), equalTo(HttpURLConnection.HTTP_OK));
assertThat(response.body(), containsString("Sample request body"));
}
@Test
public void shouldReturnSampleDataContentWhenPostWithFileProcessorStream() throws IOException, InterruptedException, URISyntaxException {
HttpRequest request = HttpRequest.newBuilder()
.uri(new URI("https://postman-echo.com/post"))
.headers("Content-Type", "text/plain;charset=UTF-8")
.POST(HttpRequest.BodyPublishers.ofFile(Paths.get("src/test/resources/sample.txt")))
.build();
HttpResponse<String> response = HttpClient.newHttpClient()
.send(request, HttpResponse.BodyHandlers.ofString());
assertThat(response.statusCode(), equalTo(HttpURLConnection.HTTP_OK));
assertThat(response.body(), containsString("Sample file content"));
}
}

54
core-java-11/src/test/java/com/baeldung/java11/httpclient/test/HttpResponseTest.java Normal file
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@ -0,0 +1,54 @@
package com.baeldung.java11.httpclient.test;
import static org.hamcrest.CoreMatchers.equalTo;
import static org.junit.Assert.assertNotNull;
import static org.junit.Assert.assertThat;
import java.io.IOException;
import java.net.HttpURLConnection;
import java.net.URI;
import java.net.URISyntaxException;
import java.net.http.HttpClient;
import java.net.http.HttpRequest;
import java.net.http.HttpResponse;
import org.junit.Test;
public class HttpResponseTest {
@Test
public void shouldReturnStatusOKWhenSendGetRequest() throws IOException, InterruptedException, URISyntaxException {
HttpRequest request = HttpRequest.newBuilder()
.uri(new URI("https://postman-echo.com/get"))
.version(HttpClient.Version.HTTP_2)
.GET()
.build();
HttpResponse<String> response = HttpClient.newBuilder()
.followRedirects(HttpClient.Redirect.NORMAL)
.build()
.send(request, HttpResponse.BodyHandlers.ofString());
assertThat(response.statusCode(), equalTo(HttpURLConnection.HTTP_OK));
assertNotNull(response.body());
}
@Test
public void shouldResponseURIDifferentThanRequestUIRWhenRedirect() throws IOException, InterruptedException, URISyntaxException {
HttpRequest request = HttpRequest.newBuilder()
.uri(new URI("http://stackoverflow.com"))
.version(HttpClient.Version.HTTP_2)
.GET()
.build();
HttpResponse<String> response = HttpClient.newBuilder()
.followRedirects(HttpClient.Redirect.NORMAL)
.build()
.send(request, HttpResponse.BodyHandlers.ofString());
assertThat(request.uri()
.toString(), equalTo("http://stackoverflow.com"));
assertThat(response.uri()
.toString(), equalTo("https://stackoverflow.com/"));
}
}

3
core-java-8/pom.xml
View File

@ -4,8 +4,8 @@
<groupId>com.baeldung</groupId>
<artifactId>core-java-8</artifactId>
<version>0.1.0-SNAPSHOT</version>
<packaging>jar</packaging>
<name>core-java-8</name>
<packaging>jar</packaging>
<parent>
<groupId>com.baeldung</groupId>
@ -180,7 +180,6 @@
<commons-collections4.version>4.1</commons-collections4.version>
<collections-generic.version>4.01</collections-generic.version>
<commons-codec.version>1.10</commons-codec.version>
<lombok.version>1.16.12</lombok.version>
<vavr.version>0.9.0</vavr.version>
<protonpack.version>1.13</protonpack.version>
<joda.version>2.10</joda.version>

13
core-java-8/src/main/java/com/baeldung/customannotations/Init.java Normal file
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@ -0,0 +1,13 @@
package com.baeldung.customannotations;
import static java.lang.annotation.ElementType.METHOD;
import static java.lang.annotation.RetentionPolicy.RUNTIME;
import java.lang.annotation.Retention;
import java.lang.annotation.Target;
@Retention(RUNTIME)
@Target(METHOD)
public @interface Init {
}

13
core-java-8/src/main/java/com/baeldung/customannotations/JsonElement.java Normal file
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@ -0,0 +1,13 @@
package com.baeldung.customannotations;
import static java.lang.annotation.ElementType.FIELD;
import static java.lang.annotation.RetentionPolicy.RUNTIME;
import java.lang.annotation.Retention;
import java.lang.annotation.Target;
@Retention(RUNTIME)
@Target({ FIELD })
public @interface JsonElement {
public String key() default "";
}

13
core-java-8/src/main/java/com/baeldung/customannotations/JsonSerializable.java Normal file
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@ -0,0 +1,13 @@
package com.baeldung.customannotations;
import static java.lang.annotation.ElementType.TYPE;
import static java.lang.annotation.RetentionPolicy.RUNTIME;
import java.lang.annotation.Retention;
import java.lang.annotation.Target;
@Retention(RUNTIME)
@Target(TYPE)
public @interface JsonSerializable {
}

10
core-java-8/src/main/java/com/baeldung/customannotations/JsonSerializationException.java Normal file
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@ -0,0 +1,10 @@
package com.baeldung.customannotations;
public class JsonSerializationException extends RuntimeException {
private static final long serialVersionUID = 1L;
public JsonSerializationException(String message) {
super(message);
}
}

67
core-java-8/src/main/java/com/baeldung/customannotations/ObjectToJsonConverter.java Normal file
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@ -0,0 +1,67 @@
package com.baeldung.customannotations;
import java.lang.reflect.Field;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.util.HashMap;
import java.util.Map;
import java.util.Objects;
import java.util.stream.Collectors;
public class ObjectToJsonConverter {
public String convertToJson(Object object) throws JsonSerializationException {
try {
checkIfSerializable(object);
initializeObject(object);
return getJsonString(object);
} catch (Exception e) {
throw new JsonSerializationException(e.getMessage());
}
}
private void checkIfSerializable(Object object) {
if (Objects.isNull(object)) {
throw new JsonSerializationException("Can't serialize a null object");
}
Class<?> clazz = object.getClass();
if (!clazz.isAnnotationPresent(JsonSerializable.class)) {
throw new JsonSerializationException("The class " + clazz.getSimpleName() + " is not annotated with JsonSerializable");
}
}
private void initializeObject(Object object) throws IllegalAccessException, IllegalArgumentException, InvocationTargetException {
Class<?> clazz = object.getClass();
for (Method method : clazz.getDeclaredMethods()) {
if (method.isAnnotationPresent(Init.class)) {
method.setAccessible(true);
method.invoke(object);
}
}
}
private String getJsonString(Object object) throws IllegalArgumentException, IllegalAccessException {
Class<?> clazz = object.getClass();
Map<String, String> jsonElementsMap = new HashMap<>();
for (Field field : clazz.getDeclaredFields()) {
field.setAccessible(true);
if (field.isAnnotationPresent(JsonElement.class)) {
jsonElementsMap.put(getKey(field), (String) field.get(object));
}
}
String jsonString = jsonElementsMap.entrySet()
.stream()
.map(entry -> "\"" + entry.getKey() + "\":\"" + entry.getValue() + "\"")
.collect(Collectors.joining(","));
return "{" + jsonString + "}";
}
private String getKey(Field field) {
String value = field.getAnnotation(JsonElement.class)
.key();
return value.isEmpty() ? field.getName() : value;
}
}

66
core-java-8/src/main/java/com/baeldung/customannotations/Person.java Normal file
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@ -0,0 +1,66 @@
package com.baeldung.customannotations;
@JsonSerializable
public class Person {
@JsonElement
private String firstName;
@JsonElement
private String lastName;
@JsonElement(key = "personAge")
private String age;
private String address;
public Person(String firstName, String lastName) {
super();
this.firstName = firstName;
this.lastName = lastName;
}
public Person(String firstName, String lastName, String age) {
this.firstName = firstName;
this.lastName = lastName;
this.age = age;
}
@Init
private void initNames() {
this.firstName = this.firstName.substring(0, 1)
.toUpperCase() + this.firstName.substring(1);
this.lastName = this.lastName.substring(0, 1)
.toUpperCase() + this.lastName.substring(1);
}
public String getFirstName() {
return firstName;
}
public void setFirstName(String firstName) {
this.firstName = firstName;
}
public String getLastName() {
return lastName;
}
public void setLastName(String lastName) {
this.lastName = lastName;
}
public String getAge() {
return age;
}
public void setAge(String age) {
this.age = age;
}
public String getAddress() {
return address;
}
public void setAddress(String address) {
this.address = address;
}
}

62
core-java-8/src/main/java/com/baeldung/streamreduce/application/Application.java Normal file
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@ -0,0 +1,62 @@
package com.baeldung.streamreduce.application;
import com.baeldung.streamreduce.entities.User;
import com.baeldung.streamreduce.utilities.NumberUtils;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
public class Application {
public static void main(String[] args) {
List<Integer> numbers = Arrays.asList(1, 2, 3, 4, 5, 6);
int result1 = numbers.stream().reduce(0, (a, b) -> a + b);
System.out.println(result1);
int result2 = numbers.stream().reduce(0, Integer::sum);
System.out.println(result2);
List<String> letters = Arrays.asList("a", "b", "c", "d", "e");
String result3 = letters.stream().reduce("", (a, b) -> a + b);
System.out.println(result3);
String result4 = letters.stream().reduce("", String::concat);
System.out.println(result4);
String result5 = letters.stream().reduce("", (a, b) -> a.toUpperCase() + b.toUpperCase());
System.out.println(result5);
List<User> users = Arrays.asList(new User("John", 30), new User("Julie", 35));
int result6 = users.stream().reduce(0, (partialAgeResult, user) -> partialAgeResult + user.getAge(), Integer::sum);
System.out.println(result6);
String result7 = letters.parallelStream().reduce("", String::concat);
System.out.println(result7);
int result8 = users.parallelStream().reduce(0, (partialAgeResult, user) -> partialAgeResult + user.getAge(), Integer::sum);
System.out.println(result8);
List<User> userList = new ArrayList<>();
for (int i = 0; i <= 1000000; i++) {
userList.add(new User("John" + i, i));
}
long t1 = System.currentTimeMillis();
int result9 = userList.stream().reduce(0, (partialAgeResult, user) -> partialAgeResult + user.getAge(), Integer::sum);
long t2 = System.currentTimeMillis();
System.out.println(result9);
System.out.println("Sequential stream time: " + (t2 - t1) + "ms");
long t3 = System.currentTimeMillis();
int result10 = userList.parallelStream().reduce(0, (partialAgeResult, user) -> partialAgeResult + user.getAge(), Integer::sum);
long t4 = System.currentTimeMillis();
System.out.println(result10);
System.out.println("Parallel stream time: " + (t4 - t3) + "ms");
int result11 = NumberUtils.divideListElements(numbers, 1);
System.out.println(result11);
int result12 = NumberUtils.divideListElementsWithExtractedTryCatchBlock(numbers, 0);
System.out.println(result12);
}
}

25
core-java-8/src/main/java/com/baeldung/streamreduce/entities/User.java Normal file
View File

@ -0,0 +1,25 @@
package com.baeldung.streamreduce.entities;
public class User {
private final String name;
private final int age;
public User(String name, int age) {
this.name = name;
this.age = age;
}
public String getName() {
return name;
}
public int getAge() {
return age;
}
@Override
public String toString() {
return "User{" + "name=" + name + ", age=" + age + '}';
}
}

52
core-java-8/src/main/java/com/baeldung/streamreduce/utilities/NumberUtils.java Normal file
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@ -0,0 +1,52 @@
package com.baeldung.streamreduce.utilities;
import java.util.List;
import java.util.function.BiFunction;
import java.util.logging.Level;
import java.util.logging.Logger;
public abstract class NumberUtils {
private static final Logger LOGGER = Logger.getLogger(NumberUtils.class.getName());
public static int divideListElements(List<Integer> values, Integer divider) {
return values.stream()
.reduce(0, (a, b) -> {
try {
return a / divider + b / divider;
} catch (ArithmeticException e) {
LOGGER.log(Level.INFO, "Arithmetic Exception: Division by Zero");
}
return 0;
});
}
public static int divideListElementsWithExtractedTryCatchBlock(List<Integer> values, int divider) {
return values.stream().reduce(0, (a, b) -> divide(a, divider) + divide(b, divider));
}
public static int divideListElementsWithApplyFunctionMethod(List<Integer> values, int divider) {
BiFunction<Integer, Integer, Integer> division = (a, b) -> a / b;
return values.stream().reduce(0, (a, b) -> applyFunction(division, a, divider) + applyFunction(division, b, divider));
}
private static int divide(int value, int factor) {
int result = 0;
try {
result = value / factor;
} catch (ArithmeticException e) {
LOGGER.log(Level.INFO, "Arithmetic Exception: Division by Zero");
}
return result;
}
private static int applyFunction(BiFunction<Integer, Integer, Integer> function, int a, int b) {
try {
return function.apply(a, b);
}
catch(Exception e) {
LOGGER.log(Level.INFO, "Exception occurred!");
}
return 0;
}
}

29
core-java-8/src/test/java/com/baeldung/collectors/Java8CollectorsUnitTest.java
View File

@ -39,6 +39,7 @@ import static org.assertj.core.api.Assertions.assertThatThrownBy;
public class Java8CollectorsUnitTest {
private final List<String> givenList = Arrays.asList("a", "bb", "ccc", "dd");
private final List<String> listWithDuplicates = Arrays.asList("a", "bb", "c", "d", "bb");
@Test
public void whenCollectingToList_shouldCollectToList() throws Exception {
@ -48,12 +49,19 @@ public class Java8CollectorsUnitTest {
}
@Test
public void whenCollectingToList_shouldCollectToSet() throws Exception {
public void whenCollectingToSet_shouldCollectToSet() throws Exception {
final Set<String> result = givenList.stream().collect(toSet());
assertThat(result).containsAll(givenList);
}
@Test
public void givenContainsDuplicateElements_whenCollectingToSet_shouldAddDuplicateElementsOnlyOnce() throws Exception {
final Set<String> result = listWithDuplicates.stream().collect(toSet());
assertThat(result).hasSize(4);
}
@Test
public void whenCollectingToCollection_shouldCollectToCollection() throws Exception {
final List<String> result = givenList.stream().collect(toCollection(LinkedList::new));
@ -77,10 +85,23 @@ public class Java8CollectorsUnitTest {
}
@Test
public void whenCollectingToMap_shouldCollectToMapMerging() throws Exception {
final Map<String, Integer> result = givenList.stream().collect(toMap(Function.identity(), String::length, (i1, i2) -> i1));
public void whenCollectingToMapwWithDuplicates_shouldCollectToMapMergingTheIdenticalItems() throws Exception {
final Map<String, Integer> result = listWithDuplicates.stream().collect(
toMap(
Function.identity(),
String::length,
(item, identicalItem) -> item
)
);
assertThat(result).containsEntry("a", 1).containsEntry("bb", 2).containsEntry("ccc", 3).containsEntry("dd", 2);
assertThat(result).containsEntry("a", 1).containsEntry("bb", 2).containsEntry("c", 1).containsEntry("d", 1);
}
@Test
public void givenContainsDuplicateElements_whenCollectingToMap_shouldThrowException() throws Exception {
assertThatThrownBy(() -> {
listWithDuplicates.stream().collect(toMap(Function.identity(), String::length));
}).isInstanceOf(IllegalStateException.class);
}
@Test

26
core-java-8/src/test/java/com/baeldung/customannotations/JsonSerializerUnitTest.java Normal file
View File

@ -0,0 +1,26 @@
package com.baeldung.customannotations;
import static org.junit.jupiter.api.Assertions.assertEquals;
import static org.junit.jupiter.api.Assertions.assertThrows;
import org.junit.jupiter.api.Test;
public class JsonSerializerUnitTest {
@Test
public void givenObjectNotSerializedThenExceptionThrown() throws JsonSerializationException {
Object object = new Object();
ObjectToJsonConverter serializer = new ObjectToJsonConverter();
assertThrows(JsonSerializationException.class, () -> {
serializer.convertToJson(object);
});
}
@Test
public void givenObjectSerializedThenTrueReturned() throws JsonSerializationException {
Person person = new Person("soufiane", "cheouati", "34");
ObjectToJsonConverter serializer = new ObjectToJsonConverter();
String jsonString = serializer.convertToJson(person);
assertEquals("{\"personAge\":\"34\",\"firstName\":\"Soufiane\",\"lastName\":\"Cheouati\"}", jsonString);
}
}

5
core-java-8/src/test/java/com/baeldung/java8/lambda/methodreference/Bicycle.java
View File

@ -5,6 +5,11 @@ public class Bicycle {
private String brand;
private Integer frameSize;
public Bicycle(String brand) {
this.brand = brand;
this.frameSize = 0;
}
public Bicycle(String brand, Integer frameSize) {
this.brand = brand;
this.frameSize = frameSize;

21
core-java-8/src/test/java/com/baeldung/java8/lambda/methodreference/MethodReferenceExamples.java → core-java-8/src/test/java/com/baeldung/java8/lambda/methodreference/MethodReferenceUnitTest.java
View File

@ -5,22 +5,21 @@ import java.util.Arrays;
import java.util.List;
import java.util.function.BiFunction;
import org.apache.commons.lang3.StringUtils;
import org.junit.Test;
public class MethodReferenceExamples {
public class MethodReferenceUnitTest {
private static <T> void doNothingAtAll(Object... o) {
}
;
@Test
public void referenceToStaticMethod() {
List<String> messages = Arrays.asList("Hello", "Baeldung", "readers!");
messages.forEach((word) -> {
System.out.println(word);
});
messages.forEach(System.out::println);
messages.forEach(word -> StringUtils.capitalize(word));
messages.forEach(StringUtils::capitalize);
}
@Test
@ -52,10 +51,18 @@ public class MethodReferenceExamples {
bikes.add(bikeCreatorMethodReference.apply("GT", 40));
}
@Test
public void referenceToConstructorSimpleExample() {
List<String> bikeBrands = Arrays.asList("Giant", "Scott", "Trek", "GT");
bikeBrands.stream()
.map(Bicycle::new)
.toArray(Bicycle[]::new);
}
@Test
public void limitationsAndAdditionalExamples() {
createBicyclesList().forEach(b -> System.out.printf("Bike brand is '%s' and frame size is '%d'%n", b.getBrand(), b.getFrameSize()));
createBicyclesList().forEach((o) -> this.doNothingAtAll(o));
createBicyclesList().forEach((o) -> MethodReferenceUnitTest.doNothingAtAll(o));
}
private List<Bicycle> createBicyclesList() {

126
core-java-8/src/test/java/com/baeldung/streamreduce/tests/StreamReduceManualTest.java Normal file
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@ -0,0 +1,126 @@
package com.baeldung.streamreduce.tests;
import com.baeldung.streamreduce.entities.User;
import com.baeldung.streamreduce.utilities.NumberUtils;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import static org.assertj.core.api.Assertions.assertThat;
import org.junit.Test;
public class StreamReduceManualTest {
@Test
public void givenIntegerList_whenReduceWithSumAccumulatorLambda_thenCorrect() {
List<Integer> numbers = Arrays.asList(1, 2, 3, 4, 5, 6);
int result = numbers.stream().reduce(0, (a, b) -> a + b);
assertThat(result).isEqualTo(21);
}
@Test
public void givenIntegerList_whenReduceWithSumAccumulatorMethodReference_thenCorrect() {
List<Integer> numbers = Arrays.asList(1, 2, 3, 4, 5, 6);
int result = numbers.stream().reduce(0, Integer::sum);
assertThat(result).isEqualTo(21);
}
@Test
public void givenStringList_whenReduceWithConcatenatorAccumulatorLambda_thenCorrect() {
List<String> letters = Arrays.asList("a", "b", "c", "d", "e");
String result = letters.stream().reduce("", (a, b) -> a + b);
assertThat(result).isEqualTo("abcde");
}
@Test
public void givenStringList_whenReduceWithConcatenatorAccumulatorMethodReference_thenCorrect() {
List<String> letters = Arrays.asList("a", "b", "c", "d", "e");
String result = letters.stream().reduce("", String::concat);
assertThat(result).isEqualTo("abcde");
}
@Test
public void givenStringList_whenReduceWithUppercaseConcatenatorAccumulator_thenCorrect() {
List<String> letters = Arrays.asList("a", "b", "c", "d", "e");
String result = letters.stream().reduce("", (a, b) -> a.toUpperCase() + b.toUpperCase());
assertThat(result).isEqualTo("ABCDE");
}
@Test
public void givenUserList_whenReduceWithAgeAccumulatorAndSumCombiner_thenCorrect() {
List<User> users = Arrays.asList(new User("John", 30), new User("Julie", 35));
int result = users.stream().reduce(0, (partialAgeResult, user) -> partialAgeResult + user.getAge(), Integer::sum);
assertThat(result).isEqualTo(65);
}
@Test
public void givenStringList_whenReduceWithParallelStream_thenCorrect() {
List<String> letters = Arrays.asList("a", "b", "c", "d", "e");
String result = letters.parallelStream().reduce("", String::concat);
assertThat(result).isEqualTo("abcde");
}
@Test
public void givenNumberUtilsClass_whenCalledDivideListElements_thenCorrect() {
List<Integer> numbers = Arrays.asList(1, 2, 3, 4, 5, 6);
assertThat(NumberUtils.divideListElements(numbers, 1)).isEqualTo(21);
}
@Test
public void givenNumberUtilsClass_whenCalledDivideListElementsWithExtractedTryCatchBlock_thenCorrect() {
List<Integer> numbers = Arrays.asList(1, 2, 3, 4, 5, 6);
assertThat(NumberUtils.divideListElementsWithExtractedTryCatchBlock(numbers, 1)).isEqualTo(21);
}
@Test
public void givenNumberUtilsClass_whenCalledDivideListElementsWithExtractedTryCatchBlockAndListContainsZero_thenCorrect() {
List<Integer> numbers = Arrays.asList(0, 1, 2, 3, 4, 5, 6);
assertThat(NumberUtils.divideListElementsWithExtractedTryCatchBlock(numbers, 1)).isEqualTo(21);
}
@Test
public void givenNumberUtilsClass_whenCalledDivideListElementsWithExtractedTryCatchBlockAndDividerIsZero_thenCorrect() {
List<Integer> numbers = Arrays.asList(1, 2, 3, 4, 5, 6);
assertThat(NumberUtils.divideListElementsWithExtractedTryCatchBlock(numbers, 0)).isEqualTo(0);
}
@Test
public void givenStream_whneCalleddivideListElementsWithApplyFunctionMethod_thenCorrect() {
List<Integer> numbers = Arrays.asList(1, 2, 3, 4, 5, 6);
assertThat(NumberUtils.divideListElementsWithApplyFunctionMethod(numbers, 1)).isEqualTo(21);
}
@Test
public void givenTwoStreams_whenCalledReduceOnParallelizedStream_thenFasterExecutionTime() {
List<User> userList = new ArrayList<>();
for (int i = 0; i <= 1000000; i++) {
userList.add(new User("John" + i, i));
}
long currentTime1 = System.currentTimeMillis();
userList.stream().reduce(0, (partialAgeResult, user) -> partialAgeResult + user.getAge(), Integer::sum);
long sequentialExecutionTime = System.currentTimeMillis() -currentTime1;
long currentTime2 = System.currentTimeMillis();
userList.parallelStream().reduce(0, (partialAgeResult, user) -> partialAgeResult + user.getAge(), Integer::sum);
long parallelizedExecutionTime = System.currentTimeMillis() - currentTime2;
assertThat(parallelizedExecutionTime).isLessThan(sequentialExecutionTime);
}
}

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

@ -26,3 +26,4 @@
- [Initialize a HashMap in Java](https://www.baeldung.com/java-initialize-hashmap)
- [Java 9 Platform Logging API](https://www.baeldung.com/java-9-logging-api)
- [Guide to java.lang.Process API](https://www.baeldung.com/java-process-api)
- [Immutable Set in Java](https://www.baeldung.com/java-immutable-set)

5
core-java-9/compile-aot.sh Executable file
View File

@ -0,0 +1,5 @@
#!/usr/bin/env bash
cd src/main/java
javac com/baeldung/java9/aot/JaotCompilation.java
jaotc --output jaotCompilation.so com/baeldung/java9/aot/JaotCompilation.class

3
core-java-9/run-aot.sh Executable file
View File

@ -0,0 +1,3 @@
#!/usr/bin/env bash
cd src/main/java
java -XX:AOTLibrary=./jaotCompilation.so com/baeldung/java9/aot/JaotCompilation

12
core-java-9/src/main/java/com/baeldung/java9/aot/JaotCompilation.java Normal file
View File

@ -0,0 +1,12 @@
package com.baeldung.java9.aot;
public class JaotCompilation {
public static void main(String[] argv) {
System.out.println(message());
}
public static String message() {
return "The JAOT compiler says 'Hello'";
}
}

16
core-java-9/src/main/java/com/baeldung/multireleaseapp/App.java Normal file
View File

@ -0,0 +1,16 @@
package com.baeldung.multireleaseapp;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
public class App {
private static final Logger logger = LoggerFactory.getLogger(App.class);
public static void main(String[] args) throws Exception {
String dateToCheck = args[0];
boolean isLeapYear = DateHelper.checkIfLeapYear(dateToCheck);
logger.info("Date given " + dateToCheck + " is leap year: " + isLeapYear);
}
}

22
core-java-9/src/main/java/com/baeldung/multireleaseapp/DateHelper.java Normal file
View File

@ -0,0 +1,22 @@
package com.baeldung.multireleaseapp;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.GregorianCalendar;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
public class DateHelper {
private static final Logger logger = LoggerFactory.getLogger(DateHelper.class);
public static boolean checkIfLeapYear(String dateStr) throws Exception {
logger.info("Checking for leap year using Java 1 calendar API");
Calendar cal = Calendar.getInstance();
cal.setTime(new SimpleDateFormat("yyyy-MM-dd").parse(dateStr));
int year = cal.get(Calendar.YEAR);
return (new GregorianCalendar()).isLeapYear(year);
}
}

18
core-java-9/src/main/java9/com/baeldung/multireleaseapp/DateHelper.java Normal file
View File

@ -0,0 +1,18 @@
package com.baeldung.multireleaseapp;
import java.time.LocalDate;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
public class DateHelper {
private static final Logger logger = LoggerFactory.getLogger(DateHelper.class);
public static boolean checkIfLeapYear(String dateStr) throws Exception {
logger.info("Checking for leap year using Java 9 Date Api");
return LocalDate.parse(dateStr)
.isLeapYear();
}
}

1
core-java-arrays/README.md
View File

@ -14,3 +14,4 @@
- [Array Operations in Java](http://www.baeldung.com/java-common-array-operations)
- [Intersection Between two Integer Arrays](https://www.baeldung.com/java-array-intersection)
- [Sorting Arrays in Java](https://www.baeldung.com/java-sorting-arrays)
- [Convert a Float to a Byte Array in Java](https://www.baeldung.com/java-convert-float-to-byte-array)

3
core-java-arrays/pom.xml
View File

@ -4,8 +4,8 @@
<groupId>com.baeldung</groupId>
<artifactId>core-java-arrays</artifactId>
<version>0.1.0-SNAPSHOT</version>
<packaging>jar</packaging>
<name>core-java-arrays</name>
<packaging>jar</packaging>
<parent>
<groupId>com.baeldung</groupId>
@ -390,7 +390,6 @@
<!-- util -->
<commons-lang3.version>3.8.1</commons-lang3.version>
<lombok.version>1.16.12</lombok.version>
<jmh-core.version>1.19</jmh-core.version>
<jmh-generator-annprocess.version>1.19</jmh-generator-annprocess.version>

1
core-java-collections-list/README.md
View File

@ -27,3 +27,4 @@
- [Flattening Nested Collections in Java](http://www.baeldung.com/java-flatten-nested-collections)
- [Intersection of Two Lists in Java](https://www.baeldung.com/java-lists-intersection)
- [Multi Dimensional ArrayList in Java](https://www.baeldung.com/java-multi-dimensional-arraylist)
- [Determine If All Elements Are the Same in a Java List](https://www.baeldung.com/java-list-all-equal)

33
core-java-collections-list/pom.xml
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@ -3,8 +3,8 @@
<modelVersion>4.0.0</modelVersion>
<artifactId>core-java-collections-list</artifactId>
<version>0.1.0-SNAPSHOT</version>
<packaging>jar</packaging>
<name>core-java-collections-list</name>
<packaging>jar</packaging>
<parent>
<groupId>com.baeldung</groupId>
@ -36,6 +36,33 @@
<version>${lombok.version}</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>net.sf.trove4j</groupId>
<artifactId>trove4j</artifactId>
<version>${trove4j.version}</version>
</dependency>
<dependency>
<groupId>it.unimi.dsi</groupId>
<artifactId>fastutil</artifactId>
<version>${fastutil.version}</version>
</dependency>
<dependency>
<groupId>colt</groupId>
<artifactId>colt</artifactId>
<version>${colt.version}</version>
</dependency>
<dependency>
<groupId>org.openjdk.jmh</groupId>
<artifactId>jmh-core</artifactId>
<version>${jmh-core.version}</version>
</dependency>
<dependency>
<groupId>org.openjdk.jmh</groupId>
<artifactId>jmh-generator-annprocess</artifactId>
<version>${jmh-core.version}</version>
</dependency>
</dependencies>
<properties>
@ -43,6 +70,8 @@
<commons-lang3.version>3.8.1</commons-lang3.version>
<avaitility.version>1.7.0</avaitility.version>
<assertj.version>3.11.1</assertj.version>
<lombok.version>1.16.12</lombok.version>
<trove4j.version>3.0.2</trove4j.version>
<fastutil.version>8.1.0</fastutil.version>
<colt.version>1.2.0</colt.version>
</properties>
</project>

55
core-java-collections-list/src/main/java/com/baeldung/allequalelements/VerifyAllEqualListElements.java Normal file
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@ -0,0 +1,55 @@
package com.baeldung.allequalelements;
import java.util.Collections;
import java.util.HashSet;
import java.util.List;
import org.apache.commons.collections4.IterableUtils;
import com.google.common.base.Predicate;
import com.google.common.collect.Iterables;
public class VerifyAllEqualListElements {
public boolean verifyAllEqualUsingALoop(List<String> list) {
for (String s : list) {
if (!s.equals(list.get(0)))
return false;
}
return true;
}
public boolean verifyAllEqualUsingHashSet(List<String> list) {
return new HashSet<String>(list).size() <= 1;
}
public boolean verifyAllEqualUsingFrequency(List<String> list) {
return list.isEmpty() || Collections.frequency(list, list.get(0)) == list.size();
}
public boolean verifyAllEqualUsingStream(List<String> list) {
return list.stream()
.distinct()
.count() <= 1;
}
public boolean verifyAllEqualAnotherUsingStream(List<String> list) {
return list.isEmpty() || list.stream()
.allMatch(list.get(0)::equals);
}
public boolean verifyAllEqualUsingGuava(List<String> list) {
return Iterables.all(list, new Predicate<String>() {
public boolean apply(String s) {
return s.equals(list.get(0));
}
});
}
public boolean verifyAllEqualUsingApacheCommon(List<String> list) {
return IterableUtils.matchesAll(list, new org.apache.commons.collections4.Predicate<String>() {
public boolean evaluate(String s) {
return s.equals(list.get(0));
}
});
}
}

52
core-java-collections-list/src/main/java/com/baeldung/list/primitive/PrimitiveCollections.java Normal file
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@ -0,0 +1,52 @@
package com.baeldung.list.primitive;
import com.google.common.primitives.ImmutableIntArray;
import com.google.common.primitives.Ints;
import gnu.trove.list.array.TIntArrayList;
import it.unimi.dsi.fastutil.ints.IntArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.OptionalDouble;
import java.util.function.IntPredicate;
import java.util.stream.IntStream;
public class PrimitiveCollections {
public static void main(String[] args) {
int[] primitives = new int[] {5, 10, 0, 2, -8};
guavaPrimitives(primitives);
intStream(primitives);
TIntArrayList tList = new TIntArrayList(primitives);
cern.colt.list.IntArrayList coltList = new cern.colt.list.IntArrayList(primitives);
IntArrayList fastUtilList = new IntArrayList(primitives);
System.out.println(tList);
System.out.println(coltList);
System.out.println(fastUtilList);
}
private static void intStream(int[] primitives) {
IntStream stream = IntStream.of(5, 10, 0, 2, -8);
IntStream newStream = IntStream.of(primitives);
OptionalDouble average = stream.filter(i -> i > 0).average();
}
private static void guavaPrimitives(int[] primitives) {
ImmutableIntArray immutableIntArray = ImmutableIntArray.builder().addAll(primitives).build();
System.out.println(immutableIntArray);
}
}

96
core-java-collections-list/src/main/java/com/baeldung/list/primitive/PrimitivesListPerformance.java Normal file
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@ -0,0 +1,96 @@
package com.baeldung.list.primitive;
import it.unimi.dsi.fastutil.ints.IntArrayList;
import gnu.trove.list.array.TIntArrayList;
import org.openjdk.jmh.annotations.*;
import org.openjdk.jmh.runner.Runner;
import org.openjdk.jmh.runner.options.Options;
import org.openjdk.jmh.runner.options.OptionsBuilder;
import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.TimeUnit;
@BenchmarkMode(Mode.SingleShotTime)
@OutputTimeUnit(TimeUnit.MILLISECONDS)
@Measurement(batchSize = 100000, iterations = 10)
@Warmup(batchSize = 100000, iterations = 10)
@State(Scope.Thread)
public class PrimitivesListPerformance {
private List<Integer> arrayList = new ArrayList<>();
private TIntArrayList tList = new TIntArrayList();
private cern.colt.list.IntArrayList coltList = new cern.colt.list.IntArrayList();
private IntArrayList fastUtilList = new IntArrayList();
private int getValue = 10;
@Benchmark
public boolean addArrayList() {
return arrayList.add(getValue);
}
@Benchmark
public boolean addTroveIntList() {
return tList.add(getValue);
}
@Benchmark
public void addColtIntList() {
coltList.add(getValue);
}
@Benchmark
public boolean addFastUtilIntList() {
return fastUtilList.add(getValue);
}
@Benchmark
public int getArrayList() {
return arrayList.get(getValue);
}
@Benchmark
public int getTroveIntList() {
return tList.get(getValue);
}
@Benchmark
public int getColtIntList() {
return coltList.get(getValue);
}
@Benchmark
public int getFastUtilIntList() {
return fastUtilList.getInt(getValue);
}
@Benchmark
public boolean containsArrayList() {
return arrayList.contains(getValue);
}
@Benchmark
public boolean containsTroveIntList() {
return tList.contains(getValue);
}
@Benchmark
public boolean containsColtIntList() {
return coltList.contains(getValue);
}
@Benchmark
public boolean containsFastUtilIntList() {
return fastUtilList.contains(getValue);
}
public static void main(String[] args) throws Exception {
Options options = new OptionsBuilder()
.include(PrimitivesListPerformance.class.getSimpleName()).threads(1)
.forks(1).shouldFailOnError(true)
.shouldDoGC(true)
.jvmArgs("-server").build();
new Runner(options).run();
}
}

172
core-java-collections-list/src/test/java/com/baeldung/allequalelements/VerifyAllEqualListElementsUnitTest.java Normal file
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@ -0,0 +1,172 @@
package com.baeldung.allequalelements;
import org.junit.Test;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import static org.junit.Assert.assertFalse;
import static org.junit.jupiter.api.Assertions.assertTrue;
public class VerifyAllEqualListElementsUnitTest {
private static List<String> notAllEqualList = new ArrayList<>();
private static List<String> emptyList = new ArrayList<>();
private static List<String> allEqualList = new ArrayList<>();
static {
notAllEqualList = Arrays.asList("Jack", "James", "Sam", "James");
emptyList = Arrays.asList();
allEqualList = Arrays.asList("Jack", "Jack", "Jack", "Jack");
}
private static VerifyAllEqualListElements verifyAllEqualListElements = new VerifyAllEqualListElements();
@Test
public void givenNotAllEqualList_whenUsingALoop_thenReturnFalse() {
boolean allEqual = verifyAllEqualListElements.verifyAllEqualUsingALoop(notAllEqualList);
assertFalse(allEqual);
}
@Test
public void givenEmptyList_whenUsingALoop_thenReturnTrue() {
boolean allEqual = verifyAllEqualListElements.verifyAllEqualUsingALoop(emptyList);
assertTrue(allEqual);
}
@Test
public void givenAllEqualList_whenUsingALoop_thenReturnTrue() {
boolean allEqual = verifyAllEqualListElements.verifyAllEqualUsingALoop(allEqualList);
assertTrue(allEqual);
}
@Test
public void givenNotAllEqualList_whenUsingHashSet_thenReturnFalse() {
boolean allEqual = verifyAllEqualListElements.verifyAllEqualUsingHashSet(notAllEqualList);
assertFalse(allEqual);
}
@Test
public void givenEmptyList_whenUsingHashSet_thenReturnTrue() {
boolean allEqual = verifyAllEqualListElements.verifyAllEqualUsingHashSet(emptyList);
assertTrue(allEqual);
}
@Test
public void givenAllEqualList_whenUsingHashSet_thenReturnTrue() {
boolean allEqual = verifyAllEqualListElements.verifyAllEqualUsingHashSet(allEqualList);
assertTrue(allEqual);
}
@Test
public void givenNotAllEqualList_whenUsingFrequency_thenReturnFalse() {
boolean allEqual = verifyAllEqualListElements.verifyAllEqualUsingFrequency(notAllEqualList);
assertFalse(allEqual);
}
@Test
public void givenEmptyList_whenUsingFrequency_thenReturnTrue() {
boolean allEqual = verifyAllEqualListElements.verifyAllEqualUsingFrequency(emptyList);
assertTrue(allEqual);
}
@Test
public void givenAllEqualList_whenUsingFrequency_thenReturnTrue() {
boolean allEqual = verifyAllEqualListElements.verifyAllEqualUsingFrequency(allEqualList);
assertTrue(allEqual);
}
@Test
public void givenNotAllEqualList_whenUsingStream_thenReturnFalse() {
boolean allEqual = verifyAllEqualListElements.verifyAllEqualUsingStream(notAllEqualList);
assertFalse(allEqual);
}
@Test
public void givenEmptyList_whenUsingStream_thenReturnTrue() {
boolean allEqual = verifyAllEqualListElements.verifyAllEqualUsingStream(emptyList);
assertTrue(allEqual);
}
@Test
public void givenAllEqualList_whenUsingStream_thenReturnTrue() {
boolean allEqual = verifyAllEqualListElements.verifyAllEqualUsingStream(allEqualList);
assertTrue(allEqual);
}
@Test
public void givenNotAllEqualList_whenUsingAnotherStream_thenReturnFalse() {
boolean allEqual = verifyAllEqualListElements.verifyAllEqualAnotherUsingStream(notAllEqualList);
assertFalse(allEqual);
}
@Test
public void givenEmptyList_whenUsingAnotherStream_thenReturnTrue() {
boolean allEqual = verifyAllEqualListElements.verifyAllEqualAnotherUsingStream(emptyList);
assertTrue(allEqual);
}
@Test
public void givenAllEqualList_whenUsingAnotherStream_thenReturnTrue() {
boolean allEqual = verifyAllEqualListElements.verifyAllEqualAnotherUsingStream(allEqualList);
assertTrue(allEqual);
}
@Test
public void givenNotAllEqualList_whenUsingGuava_thenReturnFalse() {
boolean allEqual = verifyAllEqualListElements.verifyAllEqualUsingGuava(notAllEqualList);
assertFalse(allEqual);
}
@Test
public void givenEmptyList_whenUsingGuava_thenReturnTrue() {
boolean allEqual = verifyAllEqualListElements.verifyAllEqualUsingGuava(emptyList);
assertTrue(allEqual);
}
@Test
public void givenAllEqualList_whenUsingGuava_thenReturnTrue() {
boolean allEqual = verifyAllEqualListElements.verifyAllEqualUsingGuava(allEqualList);
assertTrue(allEqual);
}
@Test
public void givenNotAllEqualList_whenUsingApacheCommon_thenReturnFalse() {
boolean allEqual = verifyAllEqualListElements.verifyAllEqualUsingApacheCommon(notAllEqualList);
assertFalse(allEqual);
}
@Test
public void givenEmptyList_whenUsingApacheCommon_thenReturnTrue() {
boolean allEqual = verifyAllEqualListElements.verifyAllEqualUsingApacheCommon(emptyList);
assertTrue(allEqual);
}
@Test
public void givenAllEqualList_whenUsingApacheCommon_thenReturnTrue() {
boolean allEqual = verifyAllEqualListElements.verifyAllEqualUsingApacheCommon(allEqualList);
assertTrue(allEqual);
}
}

1
core-java-collections/README.md
View File

@ -31,3 +31,4 @@
- [A Guide to EnumMap](https://www.baeldung.com/java-enum-map)
- [A Guide to Iterator in Java](http://www.baeldung.com/java-iterator)
- [Differences Between HashMap and Hashtable](https://www.baeldung.com/hashmap-hashtable-differences)
- [Java ArrayList vs Vector](https://www.baeldung.com/java-arraylist-vs-vector)

6
core-java-collections/pom.xml
View File

@ -3,8 +3,8 @@
<modelVersion>4.0.0</modelVersion>
<artifactId>core-java-collections</artifactId>
<version>0.1.0-SNAPSHOT</version>
<packaging>jar</packaging>
<name>core-java-collections</name>
<packaging>jar</packaging>
<parent>
<groupId>com.baeldung</groupId>
@ -54,7 +54,7 @@
<dependency>
<groupId>org.apache.commons</groupId>
<artifactId>commons-exec</artifactId>
<version>1.3</version>
<version>${commons-exec.version}</version>
</dependency>
<dependency>
<groupId>org.projectlombok</groupId>
@ -73,6 +73,6 @@
<avaitility.version>1.7.0</avaitility.version>
<assertj.version>3.11.1</assertj.version>
<eclipse.collections.version>7.1.0</eclipse.collections.version>
<lombok.version>1.16.12</lombok.version>
<commons-exec.version>1.3</commons-exec.version>
</properties>
</project>

37
core-java-collections/src/main/java/com/baeldung/charstack/CharStack.java Normal file
View File

@ -0,0 +1,37 @@
package com.baeldung.charstack;
import java.util.Iterator;
import java.util.LinkedList;
public class CharStack {
private LinkedList<Character> items;
public CharStack() {
this.items = new LinkedList<Character>();
}
public void push(Character item) {
items.push(item);
}
public Character peek() {
return items.getFirst();
}
public Character pop() {
Iterator<Character> iter = items.iterator();
Character item = iter.next();
if (item != null) {
iter.remove();
return item;
}
return null;
}
public int size() {
return items.size();
}
}

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