Implementing a Simple Event Notifier : Observer Pattern « Design Pattern « Java






  1. Java
  2. Design Pattern
  3. Observer Pattern

Implementing a Simple Event Notifier

  


import java.util.Observable;
import java.util.Observer;

class MyModel extends Observable {
  public synchronized void setChanged() {
    super.setChanged();
  }
}

public class Main {
  public static void main(String[] argv) throws Exception {
    MyModel model = new MyModel();
    model.addObserver(new Observer() {
      public void update(Observable o, Object arg) {
      }
    });
    model.setChanged();
    Object arg = "new information";
    model.notifyObservers(arg);
  }
}








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