求C#网络拓扑结构图程序的构思与代码

/**
* Calculator
* A shareware calculator
*
* @author {@link http://blog.csdn.net/hongweijin Bingbing Li}
*
* @recitation 0101 Matt Carlson
*
* @date 12/7/2005 12:08AM
*
*/

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

public class Calculator extends JFrame implements ActionListener
{
public static final int WIDTH = 800; // width of the window
public static final int HEIGHT = 600; // height of the window
public static final int BUTTON_WIDTH = 80; // width of the buttons
public static final int BUTTON_HEIGHT = 60; // height of the buttons