import java.io.*;

public class TwoCounters {
	private static AnInteger total = new AnInteger(0);
	private static AnInteger count1= new AnInteger(0);
	private static AnInteger count2= new AnInteger(0);
	
	public static void main(String [] args) throws Exception {
		Counter c1 = new Counter(count1, total);
		Counter c2 = new Counter(count2, total);
		Thread t1 = new Thread(c1);
		Thread t2 = new Thread(c2);
		t1.start(); t2.start();
		
		System.out.println("main: waiting 10 seconds");
		Thread.sleep(10000); // wait 10 seconds
		
		System.out.println("main: Count1="+count1.value()+"; Count2="+count2.value()+"; Total="+total.value());
		
		System.out.println("main: Stopping the first counter");
		t1.interrupt(); // stop the first counter
		System.out.println("main: Count1="+count1.value()+"; Count2="+count2.value()+"; Total="+total.value());
		
		System.out.println("main: waiting another 10 seconds");
		Thread.sleep(10000); // wait 10 seconds
		
		System.out.println("main: Stopping the second counter");
		t2.interrupt();
		System.out.println("main: Count1="+count1.value()+"; Count2="+count2.value()+"; Total="+total.value());
		
		System.exit(0);
	}

}


class Counter implements Runnable {
	private AnInteger index; // a refererence to an AnInteger object is stored here
	private AnInteger sum; 
	
	public Counter(AnInteger i, AnInteger t) { index = i; sum = t; }
	
	public void run() {
		int i;
		while (true) {
			for (i=0; i<100; i++) {
				// do nothing, waste some CPU cycles
			}
			if (Thread.interrupted()) { return; }
			index.increment(); sum.increment();
		}
	}
}


class AnInteger {
	private long i;
	public AnInteger(long x) { i = x; }
	public void increment() { i = i + 1; }  // you can make this a "synchronized" method
	public long value() { return i;}
}