Retrieve environment variables (JDK1.5) : Map « Collections « Java Tutorial

1. Java Tutorial
2. Collections
3. Map

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 env = System.getenv();
    for (Iterator it = env.entrySet().iterator(); it.hasNext();) {
      Map.Entry entry = (Map.Entry) it.next();
      System.out.println(entry.getKey() + " = " + entry.getValue());
    }
  }
}