Question regarding Threads and Swing for simple chat server application

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Java

Swing

threads

Is there a way to immediately stop a thread depending on a boolean variable. In my application, the ReceiveMessage runs in a while loop while(isRunning), but the boolean variable is modified by the windowClosing event. I want the thread to stop immediately when the window is closed..

public class ChatWindow extends WindowAdapter implements ActionListener {
..............
..............
    public void windowClosing(WindowEvent w){
		try{
			
			dos.flush();
                        frame.dispose();
                        isRunning =false;
			
                        //t1.stop();
			}catch(Exception oe){}
		}
}

class ReceiveMessage implements Runnable
{
..................
..................
    public void run()
    {
        
        while(ChatWindow.isRunning)
        {  try
            {
                while(true)
                {
                String str = dislocal.readUTF();
                chatmodel.addElement(chatwith+":> "+str);
                }
            }
            catch(Exception e)
            {
                System.out.println("Error receiving message!");
            }
        }
    }

}