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【Java】 java简单的计算器类
作者:shany33 / 发布于2015/9/14/ 677

	package chap;
	
	import java.awt.BorderLayout;
	import java.awt.Color;
	import java.awt.FlowLayout;
	import java.awt.GridLayout;
	import java.awt.event.ActionEvent;
	import java.awt.event.ActionListener;
	import java.text.DecimalFormat;
	
	import javax.swing.JButton;
	import javax.swing.JFrame;
	import javax.swing.JPanel;
	import javax.swing.JTextField;
	
	public class Calculator {
	 private JFrame frame;
	 private JPanel panel,panelKeys,panelKeys_up,panelKeys_down;
	
	 private JTextField textComputer;//计算区域
	 private JButton buttonBk,buttonC;//退格键和清零键
	 private JButton button[];//数字键组
	 private JButton buttonDot,buttonAddSub,buttonAdd,buttonSub,buttonMul,buttonDiv,button1,button2,button3,buttonEqual;
	
	 private double result;//计算结果
	 private final short ADD = 1;
	 private final short SUB = 2;
	 private final short MUL = 3;
	 private final short DIV = 4;
	 private short operator = -1;//运算符
	
	 public Calculator(){
	 frame = new JFrame("计算机");
	 frame.setSize(400, 250);
	 panel = new JPanel();//全局面板
	 panel.setVisible(true);
	 frame.setVisible(true);
	 frame.getContentPane().add(panel);
	 ActionListener listener = new ComputerActionListener();//按键监听器
	
	 //计算区
	 textComputer = new JTextField(15);
	 textComputer.setText("");
	 textComputer.setEditable(false);
	 textComputer.setBackground(new Color(255,255,255));
	 //功能键上半部分
	 panelKeys_up = new JPanel();
	 panelKeys_up.setLayout(new FlowLayout(FlowLayout.RIGHT));
	
	 buttonBk = new JButton("Backspace");
	 buttonBk.setForeground(new Color(255,0,0));
	
	 buttonC = new JButton("C");
	 buttonC.setForeground(new Color(255,0,0));
	
	 buttonBk.addActionListener(listener);
	 buttonC.addActionListener(listener);
	
	 panelKeys_up.add(buttonBk);
	 panelKeys_up.add(buttonC);
	
	 //功能键下半部分
	 panelKeys_down = new JPanel();
	 panelKeys_down.setLayout(new GridLayout(4,5));
	 button = new JButton[10];
	 for(int i = 0;i < button.length;i++){
	 button[i] = new JButton(Integer.toString(i));
	 button[i].setForeground(new Color(255,0,0));
	 }
	
	 buttonAddSub = new JButton("+/-");
	 buttonAddSub.setForeground(new Color(255,0,0));
	 buttonAdd = new JButton("+");
	 buttonAdd.setForeground(new Color(255,0,0));
	 buttonSub = new JButton("-");
	 buttonSub.setForeground(new Color(255,0,0));
	 buttonMul = new JButton("*");
	 buttonMul.setForeground(new Color(255,0,0));
	 buttonDiv = new JButton("/");
	 buttonDiv.setForeground(new Color(255,0,0));
	 button1 = new JButton();
	 button2 = new JButton();
	 button3 = new JButton();
	 button1.setForeground(new Color(255,0,0));
	 button2.setForeground(new Color(255,0,0));
	 button3.setForeground(new Color(255,0,0));
	 buttonEqual = new JButton("=");
	 buttonEqual.setForeground(new Color(255,0,0));
	
	 buttonAddSub.addActionListener(listener);
	 buttonAdd.addActionListener(listener);
	 buttonSub.addActionListener(listener);
	 buttonMul.addActionListener(listener);
	 buttonDiv.addActionListener(listener);
	 buttonEqual.addActionListener(listener);
	 for(int i = 0 ; i <=9 ; i++){
	 button[i].addActionListener(listener);
	 }
	
	 for(int i = 0 ; i <=9 ; i++){
	 panelKeys_down.add(button[i]);
	 }
	 panelKeys_down.add(buttonAddSub);
	 panelKeys_down.add(buttonAdd);
	 panelKeys_down.add(buttonSub);
	 panelKeys_down.add(buttonMul);
	 panelKeys_down.add(buttonDiv);
	 panelKeys_down.add(buttonEqual);
	
	 panel.setLayout(new BorderLayout());
	 panel.add(textComputer,BorderLayout.NORTH);
	 panel.add(panelKeys_up,BorderLayout.CENTER);
	 panel.add(panelKeys_down,BorderLayout.SOUTH);
	 }
	 class ComputerActionListener implements ActionListener{
	
	 @Override
	 public void actionPerformed(ActionEvent event) {
	 // TODO Auto-generated method stub
	 Object keyButton = event.getSource();
	 String text = textComputer.getText();
	 DecimalFormat df = new DecimalFormat("0.###########");
	
	 //Backspace
	 if(keyButton == buttonBk && text.length() > 0){
	 textComputer.setText(text.substring(0,text.length()-1));
	 }
	
	 //C键
	 if(keyButton == buttonC){
	 result = 0;
	 textComputer.setText("");
	 }
	
	 //数字键
	 for(int i=0;i<10;i++){
	 if(keyButton == button[i]){
	 textComputer.setText(text+i);
	 }
	 }
	
	 if(keyButton == buttonAdd){
	 operator = 1;
	 }
	 if(keyButton == buttonSub){
	 operator = 2;
	 }
	 if(keyButton == buttonMul){
	 operator = 3;
	 }
	 if(keyButton == buttonDiv){
	 operator = 4;
	 }
	
	 //符号键
	 if(keyButton == buttonAdd || keyButton == buttonSub || keyButton == buttonMul || keyButton == buttonDiv || keyButton == buttonEqual){
	 switch(operator){
	 case ADD:
	 result += Double.parseDouble(text);
	 break;
	 case SUB:
	 result -=Double.parseDouble(text);
	 break;
	 case MUL:
	 result *=Double.parseDouble(text);
	 break;
	 case DIV:
	 result /=Double.parseDouble(text);
	 break;
	 default:
	 result = Double.parseDouble(text);
	 }
	 textComputer.setText("");
	 }
	
	 if(keyButton == buttonEqual){
	 textComputer.setText(String.valueOf(result));
	 }
	 }
	
	 }
	 public static void main(String args[]){
	 new Calculator();
	 }
	}
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