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Sampadamaibin
Sampada
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maibin
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BAEL-3511 : Default parameters in Java (eugenp#8317)
* Added Assertj dependency * Default parameter example POJO and test class
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‎core-java-modules/core-java-lang-2/pom.xml‎

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<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
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<modelVersion>4.0.0</modelVersion>
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<artifactId>core-java-lang-2</artifactId>
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<version>0.1.0-SNAPSHOT</version>
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<name>core-java-lang-2</name>
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<packaging>jar</packaging>
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<parent>
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<groupId>com.baeldung</groupId>
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<artifactId>parent-java</artifactId>
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<version>0.0.1-SNAPSHOT</version>
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<relativePath>../../parent-java</relativePath>
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</parent>
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<dependencies>
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<dependency>
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<groupId>commons-beanutils</groupId>
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<artifactId>commons-beanutils</artifactId>
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<version>1.9.4</version>
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</dependency>
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<dependency>
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<groupId>org.openjdk.jmh</groupId>
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<artifactId>jmh-generator-annprocess</artifactId>
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<version>${jmh-generator.version}</version>
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</dependency>
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<dependency>
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<groupId>org.openjdk.jmh</groupId>
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<artifactId>jmh-generator-bytecode</artifactId>
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<version>${jmh-generator.version}</version>
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</dependency>
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<dependency>
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<groupId>org.openjdk.jmh</groupId>
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<artifactId>jmh-core</artifactId>
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<version>${jmh-core.version}</version>
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</dependency>
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</dependencies>
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<build>
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<finalName>core-java-lang-2</finalName>
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<resources>
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<resource>
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<directory>src/main/resources</directory>
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<filtering>true</filtering>
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</resource>
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</resources>
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</build>
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<properties>
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<jmh-core.version>1.19</jmh-core.version>
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<jmh-generator.version>1.19</jmh-generator.version>
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</properties>
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</project>
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<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
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<modelVersion>4.0.0</modelVersion>
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<artifactId>core-java-lang-2</artifactId>
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<version>0.1.0-SNAPSHOT</version>
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<name>core-java-lang-2</name>
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<packaging>jar</packaging>
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<parent>
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<groupId>com.baeldung</groupId>
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<artifactId>parent-java</artifactId>
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<version>0.0.1-SNAPSHOT</version>
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<relativePath>../../parent-java</relativePath>
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</parent>
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<dependencies>
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<dependency>
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<groupId>commons-beanutils</groupId>
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<artifactId>commons-beanutils</artifactId>
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<version>1.9.4</version>
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</dependency>
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<dependency>
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<groupId>org.openjdk.jmh</groupId>
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<artifactId>jmh-generator-annprocess</artifactId>
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<version>${jmh-generator.version}</version>
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</dependency>
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<dependency>
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<groupId>org.openjdk.jmh</groupId>
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<artifactId>jmh-generator-bytecode</artifactId>
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<version>${jmh-generator.version}</version>
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</dependency>
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<dependency>
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<groupId>org.openjdk.jmh</groupId>
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<artifactId>jmh-core</artifactId>
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<version>${jmh-core.version}</version>
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</dependency>
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<dependency>
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<groupId>org.assertj</groupId>
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<artifactId>assertj-core</artifactId>
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<version>${assertj.version}</version>
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<scope>test</scope>
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</dependency>
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</dependencies>
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<build>
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<finalName>core-java-lang-2</finalName>
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<resources>
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<resource>
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<directory>src/main/resources</directory>
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<filtering>true</filtering>
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</resource>
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</resources>
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</build>
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<properties>
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<jmh-core.version>1.19</jmh-core.version>
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<jmh-generator.version>1.19</jmh-generator.version>
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<assertj.version>3.12.2</assertj.version>
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</properties>
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</project>

‎core-java-modules/core-java-lang-2/src/main/java/com/baeldung/defaultparams/Tea.java‎

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package com.baeldung.defaultparams;
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public class Tea {
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static final int DEFAULT_TEA_POWDER = 1; // add 1 tbsp tea powder by default
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private String name; // mandatory
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private int milk; // ml
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private boolean herbs; // add herbs or don't
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private int sugar; // tbsp
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private int teaPowder; // tbsp
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public Tea(String name, int milk, boolean herbs, int sugar, int teaPowder) {
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this.name = name;
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this.milk = milk;
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this.herbs = herbs;
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this.sugar = sugar;
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this.teaPowder = teaPowder;
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}
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// when tea powder is not provided by client, use default value
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public Tea(String name, int milk, boolean herbs, int sugar) {
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this(name, milk, herbs, sugar, DEFAULT_TEA_POWDER);
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}
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// when sugar is not provided by client, don't add it
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public Tea(String name, int milk, boolean herbs) {
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this(name, milk, herbs, 0);
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}
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// when herbs is not provided by client, don't add it
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public Tea(String name, int milk) {
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this(name, milk, false);
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}
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// when milk is not provided by client, don't add it
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public Tea(String name) {
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this(name, 0);
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}
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public String getName() {
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return name;
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}
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public int getMilk() {
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return milk;
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}
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public boolean isHerbs() {
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return herbs;
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}
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public int getSugar() {
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return sugar;
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}
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public int getTeaPowder() {
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return teaPowder;
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}
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}

‎core-java-modules/core-java-lang-2/src/test/java/com/baeldung/defaultparams/TeaUnitTest.java‎

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package com.baeldung.defaultparams;
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import static org.assertj.core.api.Assertions.assertThat;
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import org.junit.Test;
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public class TeaUnitTest {
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@Test
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public void whenTeaWithOnlyName_thenCreateDefaultTea() {
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Tea blackTea = new Tea("Black Tea");
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assertThat(blackTea.getName()).isEqualTo("Black Tea");
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assertThat(blackTea.getMilk()).isEqualTo(0);
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assertThat(blackTea.isHerbs()).isFalse();
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assertThat(blackTea.getSugar()).isEqualTo(0);
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assertThat(blackTea.getTeaPowder()).isEqualTo(Tea.DEFAULT_TEA_POWDER);
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}
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}

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