Java how to write a timer
<p>Hi
I wanted to write a timer in java.which will do the following:
when program starts,start the timer1 which will stop after 45 mins, at the same time start the second timer, which will stop after 15 mins. at this time the first timer will starts again, and repeat the above loop until the program exits
first timer : 45 min (the time I can use computer)
second timer: 15 min (the pause time)
first timer : 45 min (the time I can use computer)
second timer: 15 min (the pause time)
first timer : 45 min (the time I can use computer)
second timer: 15 min (the pause time)</p>

<p>I dont know how to use the thread and timer (utils,swing) so I tried to use while(true) but the cpu goes up.
here is my current code</p>

<pre><code>static int getMinute(){
    Calendar cal=Calendar.getInstance();
    int minute=cal.getTime().getMinutes();
    return minute;
}

public static Runnable clockf(){
    if (endTime&gt;=60){
        endTime=endTime-60;}
    System.out.println(startTime);
    System.out.println(currentTime);
    System.out.println(endTime);

    if(currentTime==endTime){
        pauseStart=getMinute();
        currentTime=getMinute();
        pauseEnd=pauseStart+15;

        if(currentTime==pauseEnd){
            pauseStart=0;
            pauseEnd=0;
            startTime=getMinute();
            currentTime=getMinute();
            endTime=startTime+45;
        }
    }
    else{
        update();
    }

    return null;
</code></pre>

<p>}</p>

<pre><code>private static void update() {
    currentTime=getMinute();
    System.out.println(currentTime);
}

public static void main(String[] args) {
    startTime=getMinute();
    currentTime=getMinute();
    endTime=startTime+45;

    Thread t=new Thread(clockf());
    t.setDaemon(true);
    t.start();
    try {
        Thread.currentThread().sleep(1000);//60000

    } catch (InterruptedException e) {
        System.err.println(e);
    }



    }
</code></pre>

<p>but it isnt good. are there any way to make the clockf method run only once / min ?
or any other way to make that timer runs ?</p>
