public class EnvTest {

       public static void main(String[] args) {

           System.out.println(System.getenv("JAVA_HOME"));

       }

}

E:\develop\j2sdk1.4.2_05

public class EnvDump {

       public static void main(String[] args) {

              for (Entry entry : System.getenv().entrySet()) {

                System.out.println(entry.getKey() + "=" + entry.getValue());

              }

       }

}

public class ProcessTest {

       public static void main(String[] args) throws IOException {

          Process p = new ProcessBuilder(“C:\\Program Files\\EditPlus 2\\editplus.exe”).start();

       }

}

public class ProcessTest {

       public static void main(String[] args) throws IOException {

                  Process p = new ProcessBuilder("ping", "sina.com.cn").start();

                  InputStream is = p.getInputStream();

              BufferedReader br = new BufferedReader(new InputStreamReader(is));

              String line;

              while ((line = br.readLine()) != null) {

                System.out.println(line);

              }

       }

}

ProcessBuilder pb = new ProcessBuilder("myCommand", "myArg1", "myArg2");

Map<String, String> env = pb.environment();

env.put("VAR1", "myValue");

env.remove("OTHERVAR");

env.put("VAR2", env.get("VAR1") + "suffix");

pb.directory("myDir");

Process p = pb.start();