标准计算器代码,Java代码库,德仔网

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【Java】标准计算器
作者:锦城暮叶 / 发布于2013/10/24/ 831

	/*
	* @(#)calculate.java 1.0 2013/01/22
	*
	* Copyright (c) 2013 大连工业大学软件工作室.
	* All rights reserved.
	*
	*/

	
	/**
	*
	* @author JinCityKasto
	*
	* @since 1.0 13/01/22
	* @version 1.0 13/01/22
	*/

	//第一部分
	public class calculate {
	 public static void main(String[] args) {
	 calculateFrame frame = new calculateFrame();
	 frame.setDefaultCloseOperation(frame.EXIT_ON_CLOSE);
	 }
	}
	//第二部分

	import java.awt.*;
	import javax.swing.*;
	public class calculateFrame extends JFrame{//外部窗口 顶层容器
	 public calculateFrame(){
	 setTitle("Calculate Made By JinCityKasto");
	 calculatePane panel = new calculatePane();
	 add(panel);
	 Toolkit kit = Toolkit.getDefaultToolkit();
	 Dimension screenSize = kit.getScreenSize();
	 setSize(screenSize.width/3,screenSize.width/4);
	 setLocation(screenSize.width/4,screenSize.height/4);
	 setVisible(true);
	 setResizable(false);
	 }
	}

	//第三部分
	import javax.swing.*;
	import java.awt.*;
	import java.awt.event.*;
	public class calculatePane extends JPanel{//calculate's interface display
	 private JLabel labelForDisplay;
	 private JLabel labelForRemember;
	 private JPanel panelForTop;
	 private JPanel panelForButton;
	 private JPanel panelForUpButton;
	 private JPanel panelForCenterButton;
	 private double sign =1;
	 private double result = 0;
	 private double rememberM = 0;
	 private String lastCommond = "=";
	 private boolean calculateBegin = false;
	 private boolean judgeBegin = true;
	 private boolean judgeCleanDisplay = true;

	 public calculatePane(){
	 setLayout(new BorderLayout());
	 panelForTop = new JPanel();
	 labelForDisplay = new JLabel("0.",SwingConstants.RIGHT);
	 labelForRemember = new JLabel();
	 labelForDisplay.setBorder(BorderFactory.createEmptyBorder(10, 5, 10, 5));
	 labelForRemember.setBorder(BorderFactory.createEmptyBorder(10, 2, 10, 2));
	 panelForTop.setLayout(new GridLayout(1,2));
	 panelForTop.setBackground(Color.GRAY);
	 panelForTop.setBorder(BorderFactory.createLineBorder(Color.BLACK, 2));
	 panelForTop.add(labelForRemember);
	 panelForTop.add(labelForDisplay);
	 add(panelForTop,BorderLayout.NORTH);

	 panelForButton = new JPanel();
	 panelForUpButton = new JPanel();
	 panelForCenterButton = new JPanel();
	 panelForButton.setLayout(new BorderLayout());

	 ActionListener addNumber = new addNumberAction();
	 ActionListener useFunction = new useFunctionAction();
	
	 setButton("",useFunction,0);
	 setButton("Backspace",useFunction,0);
	 setButton("CE",useFunction,0);
	 setButton("C",useFunction,0);
	 setButton("MC",useFunction,1);
	 setButton("7",addNumber,1);
	 setButton("8",addNumber,1);
	 setButton("9",addNumber,1);
	 setButton("/",useFunction,1);
	 setButton("sqrt",useFunction,1);
	 setButton("MR",useFunction,1);
	 setButton("4",addNumber,1);
	 setButton("5",addNumber,1);
	 setButton("6",addNumber,1);
	 setButton("*",useFunction,1);
	 setButton("%",useFunction,1);
	 setButton("MS",useFunction,1);
	 setButton("1",addNumber,1);
	 setButton("2",addNumber,1);
	 setButton("3",addNumber,1);
	 setButton("-",useFunction,1);
	 setButton("1/x",useFunction,1);
	 setButton("M+",useFunction,1);
	 setButton("0",addNumber,1);
	 setButton("+/-",addNumber,1);
	 setButton(".",addNumber,1);
	 setButton("+",useFunction,1);
	 setButton("=",useFunction,1);

	 panelForUpButton.setLayout(new GridLayout(1,4));
	 panelForCenterButton.setLayout(new GridLayout(4,6));
	 panelForButton.add(panelForUpButton,BorderLayout.NORTH);
	 panelForButton.add(panelForCenterButton,BorderLayout.CENTER);
	 add(panelForButton,BorderLayout.CENTER);

	 labelForDisplay.setText("0.");
	 }
	
	 private void setButton(String label, ActionListener action,int judgeUpOrDown){
	 JButton button = new JButton(label);
	 button.addActionListener(action);
	 if(judgeUpOrDown == 0){
	 panelForUpButton.add(button);
	 if(label == ""){
	 button.setEnabled(false);
	 button.setText("锦城暮叶");
	 }
	 }else{
	 panelForCenterButton.add(button);
	 }
	 }
	
	 private class addNumberAction implements ActionListener{
	 public void actionPerformed(ActionEvent e) {
	 String inputNumber = e.getActionCommand();
	 if(judgeBegin){
	 if(judgeCleanDisplay){
	 labelForDisplay.setText("");
	 judgeCleanDisplay = false;
	 }
	 if(inputNumber.equals("+/-")){
	 sign = -sign;
	 String temporaryWords = labelForDisplay.getText();
	 if( temporaryWords.length()>=1 && temporaryWords.charAt(0) == '-'){
	 inputNumber = labelForDisplay.getText().substring(1);
	 labelForDisplay.setText(inputNumber);
	 }else{
	 inputNumber = "-";
	 labelForDisplay.setText(inputNumber + labelForDisplay.getText());
	 }
	 }else{
	 labelForDisplay.setText(labelForDisplay.getText()+inputNumber);
	 }
	 }
	 }
	 }

	 private class useFunctionAction implements ActionListener{
	 public void actionPerformed(ActionEvent e) {
	 String inputFunction = e.getActionCommand();
	 if(inputFunction.equals("=")){
	 calculateBegin = true;
	 }
	 if(inputFunction.equals("MC")){
	 labelForRemember.setText("");
	 rememberM = 0 ;
	 }
	 if(inputFunction.equals("MR") && judgeBegin ){
	 labelForDisplay.setText(rememberM+"");
	 }
	 if(inputFunction.equals("MS") && judgeBegin ){
	 rememberM = Double.parseDouble(labelForDisplay.getText());
	 if(rememberM != 0 ){
	 labelForRemember.setText("M");
	 }
	 }
	 if(inputFunction.equals("M+") && judgeBegin ){
	 rememberM += Double.parseDouble(labelForDisplay.getText());
	 if(rememberM != 0){
	 labelForRemember.setText("M");
	 }
	 }
	 if(inputFunction.equals("Backspace")){
	 if(labelForDisplay.getText().length() > 1){
	 String temporaryWords = labelForDisplay.getText();
	 temporaryWords = temporaryWords.substring(0, temporaryWords.length()-1);
	 labelForDisplay.setText(temporaryWords);
	 }else{
	 labelForDisplay.setText("0");
	 }
	 }
	 if(inputFunction.equals("CE")){
	 labelForDisplay.setText("0");
	 judgeCleanDisplay = true;
	 }
	 if(inputFunction.equals("C")){
	 labelForDisplay.setText("0");
	 judgeCleanDisplay = true;
	 judgeBegin = true;
	 result = 0 ;
	 }
	 if(inputFunction.equals("/")||inputFunction.equals("*")||inputFunction.equals("-")||inputFunction.equals("+")||inputFunction.equals("%")||inputFunction.equals("=")){
	 if(judgeBegin){
	 if(calculateBegin){
	 calculateTheResult(Double.parseDouble(labelForDisplay.getText()),lastCommond);
	 lastCommond = inputFunction;
	 }else{
	 calculateTheResult(Double.parseDouble(labelForDisplay.getText()),"=");
	 lastCommond = inputFunction;
	 calculateBegin =true;
	 }
	 }
	 }
	 if(inputFunction.equals("sqrt") && judgeBegin){
	 labelForDisplay.setText(Math.sqrt(Double.parseDouble(labelForDisplay.getText()))+"");
	 judgeCleanDisplay = true;
	 }
	 if(inputFunction.equals("1/x") && judgeBegin){
	 if(Double.parseDouble(labelForDisplay.getText()) == 0 ){
	 labelForDisplay.setText("ERROR");
	 judgeBegin = false;
	 judgeCleanDisplay = true;
	 }else{
	 labelForDisplay.setText((1 / Double.parseDouble(labelForDisplay.getText()))+"");
	 judgeCleanDisplay = true;
	 }
	 }
	 }
	 }

	 public void calculateTheResult(double number, String symbol){
	 if(symbol.equals("+")){
	 result += (sign * number);
	 }
	 if(symbol.equals("-")){
	 result -= (sign * number);
	 }
	 if(symbol.equals("*")){
	 result *= (sign * number);
	 }
	 if(symbol.equals("/")){
	 if(number == 0){
	 labelForDisplay.setText("ERROR");
	 judgeBegin = false;
	 }else{
	 result /=(sign * number);
	 }
	 }
	 if(symbol.equals("%")){
	 if(number == 0){
	 labelForDisplay.setText("ERROR");
	 judgeBegin = false;
	 }else{
	 result %= (sign * number);
	 }
	 }
	 if(symbol.equals("=")){
	 result = number;
	 }
	 if(judgeBegin){
	 labelForDisplay.setText(result+"");
	 judgeCleanDisplay = true;
	 }
	 sign = 1;
	 }
	}
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