Java tutorial
import java.util.Iterator; import java.util.Map; public class Main { public static void main(String args[]) { System.out.println("PATH = " + System.getenv("PATH")); Map<String, String> env = System.getenv(); for (Iterator<Map.Entry<String, String>> it = env.entrySet().iterator(); it.hasNext();) { Map.Entry<String, String> entry = it.next(); System.out.println(entry.hashCode()); } } }