priority.java

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class Counter implements Runnable 
{
    Thread thread;
    int counter = 0;
    volatile boolean goflag;

    public Counter(int p) 
    {
        thread = new Thread(this);
        thread.setPriority(p);
    }

    public void start() 
    {
        goflag = true;
        thread.start();
    }

    public void run() 
    {
        while (goflag) counter++;
    }

    public void end() {
        goflag = false;
    }

}

class priority 
{
    public static void main(String args[]) 
    {
        Counter thread1 = new Counter(Thread.NORM_PRIORITY + 2);
        Counter thread2 = new Counter(Thread.NORM_PRIORITY + 1);
        Counter thread3 = new Counter(Thread.NORM_PRIORITY - 1);
        Counter thread4 = new Counter(Thread.NORM_PRIORITY - 2);

        thread1.start();
        thread2.start();
        thread3.start();
        thread4.start();

        try {
            Thread.sleep(5000);
        } catch (InterruptedException e) {}

        thread1.end();
        thread2.end();
        thread3.end();
        thread4.end();

        System.out.println("Thread 1 counted: " + thread1.counter); 
        System.out.println("Thread 2 counted: " + thread2.counter);
        System.out.println("Thread 3 counted: " + thread3.counter);
        System.out.println("Thread 4 counted: " + thread4.counter);
    }
}