public class CPUTest {   
    public static void main(String[] args) {   
        int busyTime = 5;   
        int idleTime = 50;   
        long startTime = 0;   
        while (true) {   
            startTime = System.currentTimeMillis();   
            // busy loop   
            while ((System.currentTimeMillis() - startTime) < busyTime){
                // do nothing
            }
                 
            // idle loop   
            try {   
                Thread.sleep(idleTime);   
            } catch (InterruptedException e) {   
                System.out.println(e);   
            }   
        }   
    }   
}