/** Runnable that prints out forever the elements of the sequence
	seed, seed+2, seed+4, ..
    and sleeps a random time in between each element
*/ 
class ChildR implements Runnable
{
    private int seed;

    public ChildR(int seed) {
	this.seed = seed;
    }

    public void run() {
	for (int k = seed; ; k += 2) {
	    System.out.println(k);
	    try {
		Thread.sleep((long)(1000*seed*Math.random()));
	    } catch (InterruptedException e) {
		System.out.println("Interrupted sleep");
		break;
	    }
	}
    }
}

/** It starts two ChildR threads with different seeds 
    and waits for them to terminate (they do not)
*/
public class Thread1R
{
    public static void main(String[] args) {
	Thread child1 = new Thread(new ChildR(1));
	child1.start();
	Thread child2 = new Thread(new ChildR(2));
	child2.start();
	try {
	    Thread.sleep(10000); // sleep 10 seconds
	    child1.interrupt();
	    child2.interrupt();
	    child1.join();
	    child2.join();
	} catch (InterruptedException e) {
	    System.out.println("Interrupted join");
	}
    }
}