Use interface to implement call back pattern - Java Object Oriented Design

Java examples for Object Oriented Design:interface

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Description

Use interface to implement call back pattern

Demo Code

import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.JOptionPane;
import javax.swing.Timer;

public class TickTock {
  public static void main(String[] args) {
    Timer t = new Timer(1000, new Ticker());
    t.start();/*from  www .  j a  v a 2 s  .c  om*/

    // display a message box to prevent the program from ending immediately
    JOptionPane.showMessageDialog(null, "Click OK to exit program");

  }
}

class Ticker implements ActionListener {
  private boolean tick = true;

  public void actionPerformed(ActionEvent event) {
    if (tick) {
      System.out.println("Tick...");
    } else {
      System.out.println("Tock...");
    }
    tick = !tick;
  }
}

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