Mega Code Archive
Using Observer pattern with two observers observing a changing integer
<![CDATA[
import java.util.Observable;
import java.util.Observer;
public class Main {
public static void main(String[] args) {
MyObservable observable = new MyObservable();
MyObserver1 observer1 = new MyObserver1();
MyObserver2 observer2 = new MyObserver2();
observable.addObserver(observer1);
observable.addObserver(observer2);
observable.start();
try {
Thread.sleep(20000);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
class MyObserver1 implements Observer {
public void update(Observable o, Object arg) {
Integer count = (Integer) arg;
}
}
class MyObserver2 implements Observer {
public void update(Observable o, Object arg) {
Integer count = (Integer) arg;
}
}
class MyObservable extends Observable implements Runnable {
public MyObservable() {
}
public void start() {
new Thread(this).start();
}
public void run() {
int count = 0;
try {
Thread.sleep(3000);
} catch (InterruptedException e) {
e.printStackTrace();
}
count++;
setChanged();
notifyObservers(new Integer(count));
}
}
]]>