What is the BooleanUtils.toStringYesNo method in Java?

How to import `BooleanUtils`

The definition of BooleanUtils can be found in the Apache Commons Lang package. We can add the package to the Maven project by adding the following dependency to the pom.xml file:

<dependency>
            <groupId>org.apache.commons</groupId>
            <artifactId>commons-lang3</artifactId>
            <version>3.12.0</version>
</dependency>

For other versions of the commons-lang package, refer to the Maven Repository.

We can import the BooleanUtils class in the following way:

import org.apache.commons.lang3.BooleanUtils;

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <groupId>org.example</groupId>
    <artifactId>test</artifactId>
    <version>1.0-SNAPSHOT</version>

    <properties>
        <maven.compiler.source>8</maven.compiler.source>
        <maven.compiler.target>8</maven.compiler.target>
    </properties>

    <dependencies>

        <dependency>
            <groupId>org.apache.commons</groupId>
            <artifactId>commons-lang3</artifactId>
            <version>3.12.0</version>
        </dependency>

    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-shade-plugin</artifactId>
                <version>2.1</version>
                <executions>
                    <execution>
                        <phase>package</phase>
                        <goals>
                            <goal>shade</goal>
                        </goals>
                        <configuration>
                            <transformers>
                                <transformer
                                        implementation="org.apache.maven.plugins.shade.resource.ManifestResourceTransformer">
                                    <mainClass>Main</mainClass>
                                </transformer>
                            </transformers>
                        </configuration>
                    </execution>
                </executions>
            </plugin>
        </plugins>
    </build>

</project>

Explanation

The maven dependency for BooleanUtils is included in the pom.xml file.

Main.java

Line 1: We import the BooleanUtils class.
Line 6: We define a boolean variable called val. The value of val is set to true.
Lines 7–8: The return value of BooleanUtils.toStringYesNo() is stored in the yesOrNo variable and printed to console. As the value passed to the method is true, the method returns yes.
Line 10: A new value is assigned to val, i.e., false.
Lines 11-12: The return value of BooleanUtils.toStringYesNo() is stored in the yesOrNo variable and printed to console. As the value passed to the method is false, the method returns no.