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/*
* Output:
update() called, count is 10
update() called, count is 9
update() called, count is 8
update() called, count is 7
update() called, count is 6
update() called, count is 5
update() called, count is 4
update() called, count is 3
update() called, count is 2
update() called, count is 1
update() called, count is 0
*
*/
import java.util.Observable;
import java.util.Observer;
class Watcher implements Observer {
public void update(Observable obj, Object arg) {
System.out.println("update() called, count is "
+ ((Integer) arg).intValue());
}
}
class BeingWatched extends Observable {
void counter(int period) {
for (; period >= 0; period--) {
setChanged();
notifyObservers(new Integer(period));
try {
Thread.sleep(100);
} catch (InterruptedException e) {
System.out.println("Sleep interrupted");
}
}
}
}
public class MainClass {
public static void main(String args[]) {
BeingWatched observed = new BeingWatched();
Watcher observing = new Watcher();
observed.addObserver(observing);
observed.counter(10);
}
}
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