java编写的仿win7简单计算器小程序

源程序代码：

import javax.swing.*;

import java.awt.*;

import java.awt.event.*; public class CalculationTest{

public static void main(String [] argv)

{

EventQueue.invokeLater(new Runnable(){

public void run()

{

JFrame frame=new CalculationFrame();

frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

frame.setVisible(true);

}

});

}

}

class CalculationFrame extends JFrame{

public CalculationFrame()

{

setTitle("计算机 made by 蓝月追风");

CalculationPanel panel=new CalculationPanel();

add(panel);

this.setSize(300, 350);

}

}

class CalculationPanel extends JPanel

{

public CalculationPanel()

{

this.setLayout(new GridLayout(2,1));

JPanel buttonPanel=new ButtonPanel();

JPanel showPanel=new ShowPanel();

add(showPanel);

add(buttonPanel);

}

private class ShowPanel extends JPanel

{

ShowPanel()

{

panel=new JPanel();

down=new JTextArea(1,10);

up=new JTextArea(1,10);

panel.setLayout(new GridLayout(2,1));

panel.setBorder(BorderFactory.createLineBorder(Color.BLACK, 1));

down.setEditable(false);

down.setFont(new Font("Serifs",Font.BOLD,25));

up.setEditable(false);

// lastShow.setBackground(Color.red);

// showArea.setBackground(Color.BLUE);

down.setEditable(false);

down.setText("0");

panel.setPreferredSize(new Dimension(210,75));

panel.add(up);

panel.add(down);

add(panel);

setBorder(BorderFactory.createEmptyBorder(5, 3, 1, 3));

}

private JPanel panel;

}

private class ButtonPanel extends JPanel

{

public ButtonPanel()

{

start=true;

equals=false;

total=true;

result=0;

button=new JButton[17];

ActionListener NA=new numberAction();

ActionListener CA=new commendAction();

GridBagLayout gridbag=new GridBagLayout();

setLayout(gridbag);

GridBagConstraints gbc;

int

gridx,gridy,gridwidth,gridheight,anchor,fill,ipadx,ipady;

double weightx,weighty;

Insets inset=new Insets(3,3,3,3);

gridx=0;gridy=0;gridwidth=1;gridheight=1;anchor=GridBagConstraint s.CENTER;

fill=GridBagConstraints.BOTH;

ipadx=0;ipady=0;

weightx=0;weighty=0;

button[0]=new JButton("0");

gridy=3;gridx=0;

gridwidth=2;

gbc=new

GridBagConstraints(gridx,gridy,gridwidth,gridheight,weightx,weighty,a nchor,fill,inset,ipadx,ipady);

gridbag.setConstraints(button[0], gbc);

add(button[0]);