Process, help me, real java man

Question

i use following code to execute a command (exceptions are deleted):
String s="java.exe MyClass";
Runtime run=Runtime.getRuntime();
Process pro=run.exec(s);
simple enough, after the code has been executed, we see an interface (i.e. JFrame,if MyClass extends JFrame).
my question is: if user closes MyClass by click close button, in my app, how to know MyClass is destroyed?
very trick, any methods such as Process.waitFor() don't work in the case, because:
1. object Process pro represnts java.exe (not MyClass)
2. MyClass is a process created by java.exe
thx

Answer 1

hi i myself am not a guru but nothing wrong in trying
in the app that i am working i can stop the process in-between
that was possible because i was calling it through a thread
the solution to the problem could be on exit check if the thread is alive() and then you know
new JMenuitem("compile"):
setActionCommand("Compile");
addActionListener(new Compiler());
public class compiler implements ActionListener{
public void actionparformed(ActionEvent e){
String para=e.getActionCommand();new Processer(para);
class Processer implements Runnable{
public processer(String sw){this.s=sw;}
Thread d;
boolean b;              
        public  void start()
            d=new Thread(threada.this);
            d.setPriority(Thread.MAX_PRIORITY-3);
            but.setVisible(true);
            b=true;
            d.start();
public void run()
System.gc();
if(b==true)
  but.setText(" RUNNING "+ d);
  but.setToolTipText("CLICK IF YOU WANT TO STOP THE RUNNING THREAD ");
  but.addActionListener(
          new ActionListener()
              public void actionPerformed(ActionEvent we)
                 try
                 p.destroy();//p is java.lang.Process
                 r.gc();//p is java.lang.Process
                 System.gc();//p is java.lang.Process
                 b=false;
                }catch(Exception ae )
                 {System.out.println(ae);}
                              try{
                                 if (s=="Compile")
                                   new compile();
public void stop()
   try{
   but.setText(" T Stopped .);
   but.setToolTipText("CLICK IF YOU WANT TO STOP THE RUNNING THREAD   |-> "+Thread.currentThread()+"  STOPPED");
                System.gc();
                d=null;
                         }catch(Exception ){}so to all given logic if you could directly dispose the active threads or nullify them it could work or
let us say if the thread is alive then we can show a confirm popup asking if they want the process to end or not
of course u have to handle it in WindowClosingEvvent before your System.exit(0);