Execute the following PushCounter class and PushCounterPanel class. import javax

Question

Execute the following PushCounter class and PushCounterPanel class.

import javax.swing.JFrame;

public class PushCounter

{

public static void main(String[] args)

JFrame frame = new JFrame("Push Counter");

PushCounterPanel panel = new PushCounterPanel();

import java.awt.*;

import java.awt.event.*;

import javax.swing.*;

public class PushCounterPanel extends JPanel

{

private int count;

private JButton push;

private JLabel label;

public PushCounterPanel()

count = 0;

push = new JButton("Increment");

label = new JLabel();

label.setText("Value: " + count);

push.addActionListener(new ButtonListener());

setPreferredSize(new Dimension(300, 40));

       private class ButtonListener implements ActionListener

       {

public void actionPerformed(ActionEvent event)

label.setText("Value: " + count);

       }

}

1) Add another button called “Decrement”, and modify the PushCounterPanel class so that each time the Decrement button is pressed, count value is decremented.

Explanation / Answer

public class PushCounterPanel extends JPanel

{

private int count;

private JButton push,pushDec;

private JLabel label;

public PushCounterPanel()

count = 0;

push = new JButton("Increment");
push = new JButton("Decrement");

label = new JLabel();

label.setText("Value: " + count);

push.addActionListener(new ButtonListener());
pushDec.addActionListener(new ButtonListener());

setPreferredSize(new Dimension(300, 40));

private class ButtonListener implements ActionListener

{

public void actionPerformed(ActionEvent event)
count = count-1;
label.setText("Value: " + count);

}

}

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