setCallBack method in swing

If you could explain me the concept behind it, it would be more useful.

Say you define an interface:

---------

interface GuffCallback
{
  public void doSomething( String woo ) ;
}

---------

Then, you can make another class that will call you back when it is done (in this case, a threaded object)

---------

public class ThreadedObject implements Runnable
{
  volatile Thread runner = null ;
  GuffCallback whenDone = null ;

  public ThreadedObject()
  {
  }

  public void setCallback( GuffCallback cb )
  {
    whenDone = cb ;
  }

  public void start()
  {
    if( runner == null )
    {
      runner = new Thread( this ) ;
      runner.start() ;
    }
  }
 
  public void run()
  {
    // do something that will take some time...
    try{ runner.sleep( 30000 ) ; } catch( InterruptedException ex ) {}
    if( whenDone != null )
    {
      whenDone.doSomething( "DONE IT!!" ) ;
    }
  }
}

---------

Then, you make your main class implement that interface, and create the thread thing to call you back...

---------

public MyMainClass extends JFrame implements GuffCallback
{

  ....
  // required for the interface...
  public void doSomething( String woo )
  {
    System.out.println( "Something called with parameter " + woo ) ;
  }
  ...

  public void doIt()
  {
    ThreadedObject obj = new ThreadedObject() ;
    obj.setCallback( this ) ;
    obj.start() ;
  }
}

---------

srivenky:
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