System.getenv() in Java?\

System.getenv() in Java?

System.getenv():

• It will return all the system environment variables
• System.getenv() method return type is Map<String,String>

Demo program on System.getenv():

public class EnvVariables {
    public static void main(String args[]) {
        System.out.println(System.getenv());
    }
}

Output:

System.getenv()

Get required environment variable value:

import java.util.Map;
public class EnvVariables {
    public static void main(String args[]) {
        Map envVariables = System.getenv();
        System.out.println("System Environment Variables=" + envVariables);
        System.out.println("Get specific environment variable using map=" + envVariables.get("JAVA_HOME"));

        System.out.println("Get specific environment variable directly="+System.getenv("JAVA_HOME"));
    }
}
Output:
System.getenv()
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