How do i run two threads with different sleep times?

Question

How do i run two threads with different sleep times?
Ive got thread A and thread B, they both update a jpanel.
They both start when i press the start button.
However thread A updates every 250ms and thread B updates every 1000ms. i cant just run them both at 250ms becuase this will mess it up.
So for every four runs of thread A i want thread b to only be run once
Does anyone know how to do this?
Thanks, Ant...

Answer 1

ok, ive done it but now i cant stop it!
ive added buttons to start and stop, the start button works but the stop button doesnt. why doesnt "t.stop();" work?
    public void run() {
        while(t == Thread.currentThread()) {
            System.out.println("No " + t.getName());
            if (t.getName().equals("1")){
                try {
                    t.sleep(1000); // in milliseconds
                } catch (InterruptedException e) {}
            } else{
                try {
                    t.sleep(250); // in milliseconds
                } catch (InterruptedException e) {}
    }