Using Inner Classes to Listen for Events - Java Object Oriented Design

Java examples for Object Oriented Design:Inner Class

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Description

Using Inner Classes to Listen for Events

Demo Code

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

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;

public class ClickMe2 extends JFrame {
  public static void main(String[] args) {
    new ClickMe2();
  }/*from   w  w  w.  j  ava2 s .  c o  m*/

  private JButton button1;

  public ClickMe2() {
    this.setSize(200, 100);
    this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    this.setTitle("I'm Listening");

    ClickListener cl = new ClickListener();

    JPanel panel1 = new JPanel();
    button1 = new JButton("Click Me!");
    button1.addActionListener(cl);
    panel1.add(button1);
    this.add(panel1);

    this.setVisible(true);
  }

  private class ClickListener implements ActionListener {
    private int clickCount = 0;

    public void actionPerformed(ActionEvent e) {
      if (e.getSource() == button1) {
        clickCount++;
        if (clickCount == 1)
          button1.setText("I've been clicked!");
        else
          button1.setText("I've been clicked " + clickCount + " times!");
      }
    }
  }
}

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