java计算器 图形用户界面 精简版

package com.rgy.entity;

import java.awt.*;
import java.awt.event.*;

@SuppressWarnings("serial")
public class Computer extends Frame implements ActionListener{
private Panel panel_keys;
private TextField text_show;
private String str="";
private double num_record=0;
private int count_cut=0;
private int count_multiplication=0;
private int count_division=0;
private int op=0;
private Button button_num0;private Button button_num1;
private Button button_num2;private Button button_num3;
private Button button_num4;private Button button_num5;
private Button button_num6;private Button button_num7;
private Button button_num8;private Button button_num9;
private Button button_division;
private Button button_multiplication;
private Button button_cut;
private Button button_add;
private Button button_equal;
private Button button_point;

public Computer(){
super("计算器");
this.setVisible(true);
this.setBounds(500,250,300,250);

panel_keys=new Panel();
text_show=new TextField();
text_show.setEditable(false);

button_num0=new Button("0");button_num1=new Button("1");
button_num2=new Button("2");button_num3=new Button("3");
button_num4=new Button("4");button_num5=new Button("5");
button_num6=new Button("6");button_num7=new Button("7");
button_num8=new Button("8");button_num9=new Button("9");
button_division=new Button("/");
button_multiplication=new Button("*");
button_cut=new Button("-");
button_add=new Button("+");
button_equal=new Button("=");
button_point=new Button(".");

this.add(text_show,BorderLayout.NORTH);
this.add(panel_keys,BorderLayout.CENTER);

panel_keys.add(button_num7);panel_keys.add(button_num8);panel_keys.add(button_num9);panel_keys.add(button_division);
panel_keys.add(button_num4);panel_keys.add(button_num5);panel_keys.add(button_num6);panel_keys.add(button_multiplication);
panel_keys.add(button_num1);panel_keys.add(button_num2);panel_keys.add(button_num3);panel_keys.add(button_cut);
panel_keys.add(button_num0);panel_keys.add(button_point);panel_keys.add(button_equal);panel_keys.add(button_add);

panel_keys.setLayout(new GridLayout(4,4));

this.addWindowListener(new WinClose());
button_num0.addActionListener(this);
button_num1.addActionListener(this);
button_num2.addActionListener(this);
button_num3.addActionListener(this);
button_num4.addActionListener(this);
button_num5.addActionListener(this);
button_num6.addActionListener(this);
button_num7.addActionListener(this);
button_num8.addActionListener(this);
button_num9.addActionListener(this);
button_division.addActionListener(this);
button_multiplication.addActionListener(this);
button_add.addActionListener(this);
button_cut.addActionListener(this);
button_equal.addActionListener(this);
button_point.addActionListener(this);
}

//键盘事件监听
public void actionPerformed(ActionEvent ev) {
if(ev.getSource()==button_num0){
str=text_show.getText()+"0";
text_show.setText(str);
}
if(ev.getSource()==button_num1){
str=text_show.getText()+"1";
text_show.setText(str);
}
if(ev.getSource()==button_num2){
str=text_show.getText()+"2";
text_show.setText(str);
}
if(ev.getSource()==button_num3){
str=text_show.getText()+"3";
text_show.setText(str);
}
if(ev.getSource()==button_num4){
str=text_show.getText()+"4";
text_show.setText(str);
}
if(ev.getSource()==button_num5){
str=text_show.getText()+"5";
text_show.setText(str);
}
if(ev.getSource()==button_num6){
str=text_show.getText()+"6";
text_show.setText(str);
}
if(ev.getSource()==button_num7){
str=text_show.getText()+"7";
text_show.setText(str);
}
if(ev.getSource()==button_num8){
str=text_show.getText()+"8";
text_show.setText(str);
}
if(ev.getSource()==button_num9){
str=text_show.getText()+"9";
text_show.setText(str);
}
if(ev.getSource()==button_point){
str=text_show.getText()+".";
text_show.setText(str);
}
if(ev.getSource()==button_add){
if(op==5){}
else{
num_record=num_record+Double.parseDouble(str);
}
str="";
text_show.setText(str);
op=1;
}
if(ev.getSource()==button_cut){
if(op==5){}
else{
if(count_cut==0){
num_record=Double.parseDouble(str);
count_cut++;
}
else{
num_record=num_record-Double.parseDouble(str);
}
}
str="";
text_show.setText(str);
op=2;
}
if(ev.getSource()==button_multiplication){
if(op==5){}
else{
if(count_multiplication==0){
num_record=Double.parseDouble(str);
count_multiplication++;
}
else{
num_record=num_record*Double.parseDouble(str);
}
}
str="";
text_show.setText(str);
op=3;
}
if(ev.getSource()==button_division){
if(op==5){}
else{
if(count_division==0){
num_record=Double.parseDouble(str);
count_division++;
}
else{
num_record=num_record/Double.parseDouble(str);
}
}
str="";
text_show.setText(str);
op=4;
}
if(ev.getSource()==button_equal){
if(op==1){
num_record=num_record+Double.parseDouble(str);
}
if(op==2){
num_record=num_record-Double.parseDouble(str);
}
if(op==3){
num_record=num_record*Double.parseDouble(str);
}
if(op==4){
num_record=num_record/Double.parseDouble(str);
}

if(num_record-(int)num_record==0){
text_show.setText(""+(int)num_record);
}
else{
text_show.setText(""+num_record);
}
op=5;
}
}

//窗体事件监听
public class WinClose implements WindowListener {
public void windowOpened(WindowEvent e) {}
public void windowClosing(WindowEvent e) {
System.exit(0);
}
public void windowClosed(WindowEvent e) {}
public void windowIconified(WindowEvent e) {}
public void windowDeiconified(WindowEvent e) {}
public void windowActivated(WindowEvent e) {}
public void windowDeactivated(WindowEvent e) {}
}
}

package com.rgy.Test;

import com.rgy.entity.*;

public class Test {
public static void main(String args[]){
new Computer();
}
}