suspend() and resume()

[Amit Goel]

please read this code :
class a {
public static void main(String agrs[]){
System.out.println("Begin ");
suspend();
resume();
System.out.println("End ");
}
}
the answer printed is
Begin
and then the system hangs as it is suspended by suspend command
but why it is not called back by resume.
tell me how the resume functions(through object calls or whatever).
how to print both Begin and End ?

[Bharatesh H Kakamari]

A suspended thread cannot resume itself. Some other thread that has got the permission (the thread belonging to the same ThreadGroup) must start this suspended thread.
Here is the code that prints Begin ... End :

class Suspended extends Thread
{
public void run()
{
 suspending();
}
public void suspending ()
{
System.out.println("Now suspending ... Begin");
suspend();
System.out.println("Already resumed ...End");
}

public void resuming()
{
System.out.println ("Now resuming ...");
resume();
System.out.println ("Resumed ...");
}
}
class SuspendandResume
{

public static void main(String agrs[])
{
Suspended s = new Suspended();
s.start();
for (int i = 0; i<10;i++) 
System.out.println (i);
s.resuming();
System.out.println("Main Exiting ");
}
}

HTH

[Srinivas V]

Hi amit
In the program there is only one thread main.
If u suspend this thread and resume means it waits for another thread to execute, that why it wont print END.
If u create one more thread, then it prints both like

class a extends Thread{
public a(){
Thread t1= new Thread(this);
t1.start();
}
public void run(){
this.suspend();
System.out.println("Begin ");
System.out.println("End ");
}
public static void main(String agrs[]){
a t2 = new a();
Thread t=Thread.currentThread();
t.resume();
}
}

Srinivas

[Angela Poynton]

Srinivas V,
Your contribution to Javaranch is very important to us.
However we do have a naming policy outlined here.
Please register again with a name which complies to this rule.
Otherwise I'm afraid you may come to the Ranch soon and find that your account has been locked.
Thank You.
[This message has been edited by Angela Poynton (edited December 08, 2000).]