/**

* @(#)PanelTest.java

*

*

* @author

* @version 1.00 2015/5/14

*/

import java.awt.*;

import java.awt.event.*;

import javax.swing.*;

public class PanelTest extends JFrame implements ActionListener

{

private JPanel panel;

private JLabel output;

private JButton[] buttons;

private JButton clear;

public PanelTest()

{

panel = new JPanel();

output = new JLabel(" ");

buttons = new JButton[12];

clear = new JButton("clear");

for (int i = 0; i <= 9; i ++)

buttons[i] = new JButton(""+i);

buttons[10] = new JButton("#");

buttons[11] = new JButton("*");

clear = new JButton("CLEAR");

setSize(400,400);

setDefaultCloseOperation(EXIT_ON_CLOSE);

setTitle("Calculator");

panel.setLayout(new GridLayout(4,3));

for (int i = 1; i <=9; i ++)

panel.add(buttons[i]);

panel.add(buttons[10]);

panel.add(buttons[0]);

panel.add(buttons[11]);

Container pane = this.getContentPane();

this.setLayout(new BorderLayout());

pane.add(output, BorderLayout.NORTH);

pane.add(clear, BorderLayout.SOUTH);

pane.add(panel, BorderLayout.CENTER);

for (int i = 0; i < 12; i ++)

buttons[i].addActionListener(this);

clear.addActionListener(this);

setVisible(true);

}

public void actionPerformed(ActionEvent e)

{

if (e.getActionCommand().equals("CLEAR"))

output.setText(" ");

else

{

String content = e.getActionCommand();

output.setText(output.getText()+content);

}

}

public static void main (String args[])

{new PanelTest();}

}