i can't see circle moving

Question

While using Swing in java, I am trying to move a circle slowly from a starting position to an end position when clicking a button. However, I can\'t see the circle moving. It ju

Answer 1

As Andrew Thompson said, calling Thread.sleep() without defining a second thread freezes everything, so the solution is to define and run another thread like so:

class Bute implements ActionListener, Runnable {
    //let class implement Runnable interface
    Thread t;   // define 2nd thread

    public void actionPerformed(ActionEvent e) {

        t = new Thread(this);   //start a new thread
        t.start();
    }

    @Override               //override our thread's run() method to do what we want 
    public void run() {     //this is after some java-internal init stuff called by start()
        //b.setEnabled(false);
        for (int i = 0; i < 150; i++) {
            x++;
            y++;
            m.repaint();
            try {
                Thread.sleep(50);   //let the 2nd thread sleep
            } catch (InterruptedException iEx) {
                iEx.printStackTrace();  
            }
        }
        //b.setEnabled(true);
    }

}

The only problem with this solution is that pressing the button multiple times will speed up the circle, but this can be fixed by making the button unclickable during the animation via b.setEnabled(true/false). Not the best solution but it works.