What is SystemUtils.getEnvironmentVariable() in Java?

How to import `SystemUtils`

The definition of SystemUtils can be found in the Apache Commons Lang package, which we can add 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.

You can import the SystemUtils class as follows:

import org.apache.commons.lang3.SystemUtils;

Syntax

public static String getEnvironmentVariable(String name, String defaultValue)

Parameters

String name: The environment variable name.
String defaultValue: The default value.

Return value

This method returns the environment variable value. If there is no environment variable value, it returns the default value.

import org.apache.commons.lang3.SystemUtils;
public class Main{
    public static void main(String[] args){
        // Example 1
        String envVarName = "HOME";
        String defaultValue = "Variable not there";
        System.out.printf("The output of SystemUtils.getEnvironmentVariable for '%s' is '%s'", envVarName, SystemUtils.getEnvironmentVariable(envVarName, defaultValue));
        System.out.println();
        // Example 2
        envVarName = "random-env-name";
        defaultValue = "Variable not there";
        System.out.printf("The output of SystemUtils.getEnvironmentVariable for '%s' is '%s'", envVarName, SystemUtils.getEnvironmentVariable(envVarName, defaultValue));
        System.out.println();
    }
}

Expected output

The output of the code is as follows:

The output of SystemUtils.getEnvironmentVariable for 'HOME' is '/Users/abhi'
The output of SystemUtils.getEnvironmentVariable for 'random-env-name' is 'Variable not there'

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