quick question about a ButtonListener and a ActionListener

[jdg93]

I have made a JPanel that has two buttons. One is called Increment and the other is called Decrement. When you press the Increment, it supposed to add 1 to the total. Decrement will subtract 1 from the total. The buttons work fine when I comment the other out, but when they are both in there they cancel each other out, so nothing happens.

How do I go about getting them to work together?


Here's my code:

import javax.swing.*;
import java.awt.event.*;
import java.awt.*;

public class ButtonPanel extends JPanel
{

private int count;
private JButton plus;
private JButton minus;
private JLabel label;


public ButtonPanel()
{
count = 50;

plus = new JButton("Increment");
plus.addActionListener(new ButtonListener());

minus = new JButton("Decrement");
minus.addActionListener(new ButtonListener());

label = new JLabel("" + count);

add(plus);
add(minus);
add(label);

setPreferredSize (new Dimension(400, 50));
setBackground (Color.orange);
}

private class ButtonListener implements ActionListener
{
public void actionPerformed (ActionEvent event)
{
count++;
count--;

label.setText("" + count);
}

}
}

[sjalle]

Inner classes are messy.

import javax.swing.*;
import java.awt.event.*;
import java.awt.*;

public class ButtonUsage
    extends JPanel implements ActionListener {

  private int count;
  private JButton plus;
  private JButton minus;
  private JLabel label;

  public ButtonUsage() {
    count = 50;

    plus = new JButton("Increment");
    plus.addActionListener(this);

    minus = new JButton("Decrement");
    minus.addActionListener(this);

    label = new JLabel("" + count);

    add(plus);
    add(minus);
    add(label);

    setPreferredSize(new Dimension(400, 50));
    setBackground(Color.orange);
  }

  public void actionPerformed(ActionEvent event) {
    if (event.getSource()==plus) {
      label.setText("" + (++count));
    } else if (event.getSource()==minus) {
      label.setText("" + (--count));
    } else {
      label.setText("HUH ??"); // will never happend
    }
  }
}

[themoffster]

private class ButtonListener implements ActionListener
{
  public void actionPerformed (ActionEvent event)
  {
    count++;
    count--;

    label.setText("" + count);
  }
}

This bit of code explains it for you...