Pause And Resume Thread Using MouseClick?

Here I want to make a simple program where a Ball keep bouncing forever, then I add a MouseClick Listener to stop and resume thread (I mean, to stop moving Ball and to resume again). The problem is I can stop the thread using wait(), But I can not resume it. Below is the code

public class TestResumePauseBall {
public static void main(String[] args) {
EventQueue.invokeLater(new Runnable() {
@Override
public synchronized void run() {
Field aField = new Field();

[code]....

At first I think that notify() must be called from another active thread. So I add a 'class Timing implements Runnable'. Then I call notifyAll() from class Timing. But still it was failed.

After wait() called on Ball's thread, the whole frame also freeze. I can not understand why this happen?

If this test success, I will add 1 one more ball and add keyboard keys as controller of ball's movement.