//------------
// Introduction to Programming Using Java: An Object-Oriented Approach
//	Arnow/Weiss
//------------
class CountingThread extends Thread {
	public CountingThread(int x) {
		this.x = x;
	}

	/*********
	public void run() {
		int    i=0;
		while (i<15) {
			System.out.println(i);
			i+=x;
		}
	}
	*********/

	public void run() {
		int    i=0;
		while (i<15) {
			System.out.println(i);
			i+=x;
			try {
				sleep(1);
			} catch(Exception e) {}
		}
	}

	private    int            x;
}

public class CountingThreadExample {
	public static void main(String a[]) {
		CountingThread  t1 = new CountingThread(2);
		CountingThread t2 = new CountingThread(3);
		t1.start();
		t2.start();
	}
}