Java Code to obtain all the system properties

import java.util.Enumeration;
import java.util.Properties;


public class props {
    public static void main(String []args)
    {
        Properties p =new Properties();
        p=System.getProperties();
        System.out.println("Properties details");
        Enumeration<?> e = p.propertyNames();
       
        while( e.hasMoreElements())
        {
            String s = (String)e.nextElement();
            System.out.println(s+"--------"+p.getProperty(s));
        }
    }

}


Here the p.PropertyNames() will return a enum with all distinct keys. and <?> means the enum can have key as any thing like object string, int etc
After getting the enums we are just looping and getting single key at a time and then getting the corresponding value.

Enjoy . Happy Coding