java代码写亲戚计算器最简单java计算器代码

如何用JAVA语言编写计算器小程序？

具体代码如下：

凤城网站建设公司创新互联,凤城网站设计制作，有大型网站制作公司丰富经验。已为凤城1000+提供企业网站建设服务。企业网站搭建\成都外贸网站制作要多少钱，请找那个售后服务好的凤城做网站的公司定做！

import javax.swing.*;

import java.awt.event.*;

import java.awt.*;

public class Calculator extends JFrame implements ActionListener {

private JFrame jf;

private JButton[] allButtons;

private JButton clearButton;

private JTextField jtf;

public Calculator() {

//对图形组件实例化

jf=new JFrame("任静的计算器1.0：JAVA版");

jf.addWindowListener(new WindowAdapter(){

public void windowClosing(){

System.exit(0);

}

});

allButtons=new JButton[16];

clearButton=new JButton("清除");

jtf=new JTextField(25);

jtf.setEditable(false);

String str="123+456-789*0.=/";

for(int i=0;iallButtons.length;i++){

allButtons[i]=new JButton(str.substring(i,i+1));

}

public void init(){

//完成布局

jf.setLayout(new BorderLayout());

JPanel northPanel=new JPanel();

JPanel centerPanel=new JPanel();

JPanel southPanel=new JPanel();

northPanel.setLayout(new FlowLayout());

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

southPanel.setLayout(new FlowLayout());

northPanel.add(jtf);

for(int i=0;i16;i++){

centerPanel.add(allButtons[i]);

}

southPanel.add(clearButton);

jf.add(northPanel,BorderLayout.NORTH);

jf.add(centerPanel,BorderLayout.CENTER);

jf.add(southPanel,BorderLayout.SOUTH);

addEventHandler();

}

//添加事件监听

public void addEventHandler(){

jtf.addActionListener(this);

for(int i=0;iallButtons.length;i++){

allButtons[i].addActionListener(this);

}

clearButton.addActionListener(new ActionListener(){

public void actionPerformed(ActionEvent e) {

// TODO Auto-generated method stub

Calculator.this.jtf.setText("");

}

});

}

//事件处理

public void actionPerformed(ActionEvent e) {

//在这里完成事件处理使计算器可以运行

String action=e.getActionCommand();

if(action=="+"||action=="-"||action=="*"||action=="/"){

}

public void setFontAndColor(){

Font f=new Font("宋体",Font.BOLD,24);

jtf.setFont(f);

jtf.setBackground(new Color(0x8f,0xa0,0xfb));

for(int i=0;i16;i++){

allButtons[i].setFont(f);

allButtons[i].setForeground(Color.RED);

}

public void showMe(){

init();

setFontAndColor();

jf.pack();

jf.setVisible(true);

jf.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

}

public static void main(String[] args){

new Calculator().showMe();

}

JAVA 编写计算器要代码最简单的

学java的时候自己编的，很简单，能够连续输入计算式后进行计算

import java.awt.BorderLayout;

import java.awt.Color;

import java.awt.FlowLayout;

import java.awt.Font;

import java.awt.GridLayout;

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

import java.text.NumberFormat;

import java.util.ArrayList;

import javax.swing.JButton;

import javax.swing.JFrame;

import javax.swing.JPanel;

import javax.swing.JTextField;

/**简易计算器，能够进行简单的计算

* @see 2008.12.9

public class CalculatorA

implements ActionListener{

private JFrame frame;

private JTextField field;

private JButton[] allButtons;

private JButton clearButton;

// private JButton backButton;

String result="";//保存结果

StringBuilder sb = new StringBuilder();//保存要进行的计算式

int x = 0; //用来判断上一次的事件类型

String str = "123+456-789*0.=/";

ArrayListString arrayList = new ArrayListString();//保存计算式，通过方法进行运算

public CalculatorA(){

frame = new JFrame("我的计算器v1.1");

frame.setLocation(300,300);

field = new JTextField(25);

allButtons = new JButton[16];

for(int i=0;iallButtons.length;i++){

allButtons[i]= new JButton(str.substring(i,i+1));

}

clearButton = new JButton("CLEAR");

// backButton = new JButton("——");

init();

setFondAndColor();

addEventHander();

}

public void init(){

frame.setLayout(new BorderLayout());

JPanel northPanel = new JPanel();

JPanel centerPanel = new JPanel();

JPanel southPanel = new JPanel();

northPanel.setLayout(new FlowLayout());

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

southPanel.setLayout(new FlowLayout());

northPanel.add(field);

for(int i=0;iallButtons.length;i++){

centerPanel.add(allButtons[i]);

}

southPanel.add(clearButton);

//southPanel.add(backButton);

frame.add(northPanel,BorderLayout.NORTH);

frame.add(centerPanel,BorderLayout.CENTER);

frame.add(southPanel,BorderLayout.SOUTH);

}

//设置输入字体

public void setFondAndColor(){

field.setFont(new Font("宋体",Font.BOLD,24));

field.setBackground(new Color(100,200,200));

field.setForeground(Color.RED);

//设置字体从右起始

field.setHorizontalAlignment(JTextField.RIGHT);

}

public void showMi(){

frame.pack();

frame.setResizable(false);

frame.setVisible(true);

frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

}

public void addEventHander(){

for(int i=0;iallButtons.length;i++){

allButtons[i].addActionListener(this);

}

clearButton.addActionListener(this);

// backButton.addActionListener(this);

}

@Override

public void actionPerformed(ActionEvent e) {

String str = e.getActionCommand();//取得当前事件返回的值

if("0123456789.".indexOf(str)!=-1){

if(x == 0){ //当x为0时表示还没有进行输入

result=str;

sb.append(str);

field.setText(str);

x = 1;

}

else if(x == 1){

result = result +str;

sb.append(str);

field.setText(result);

x = 1;

}

else if(x == 2){

sb.delete(0,sb.length());

result = result+str;

sb.append(str);

field.setText(result);

x = 1;

}

else if(x == 3){

result = str;

sb.delete(0,sb.length());

arrayList.clear();

field.setText(str);

sb.append(str);

field.setText(str);

x = 1;

}

else if(x == 4){

result ="";

sb.delete(0,sb.length());

arrayList.clear();

result = str;

sb.append(str);

field.setText(str);

x = 1;

}

else{

result = result +str;

sb.append(str);

field.setText(result);

x = 1;

}

else if("+*-/".indexOf(str)!=-1){

if(x == 0){

field.setText("");

x = 2;

}

else if(x == 1){

result = result + str;

arrayList.add(sb.toString());

arrayList.add(str);

sb.append(str);

field.setText(result);

x = 2;

}

else if(x == 2){

x = 2;

}

else if(x == 3){

field.setText(result+str);

arrayList.add(result);

arrayList.add(str);

result = result+str;

x = 2;

}

else if(x == 4){

result ="";

sb.delete(0,sb.length());

arrayList.clear();

x = 2;

}

else{

field.setText(result+str);

arrayList.add(result);

arrayList.add(str);

result = result+str;

x = 2;

}

else if("=".equals(str)){

if(x == 0){

field.setText("0");

arrayList.clear();

result = "0";

x = 3;

}

else if(x == 1){

try{

arrayList.add(sb.toString());

arrayList = getResult(arrayList);

result = arrayList.get(0);

field.setText(result);

arrayList.clear();

x = 3;

}catch(Exception e1){

field.setText("数据格式异常");

x = 0;

}

else if(x == 2){

field.setText("数据格式错误.....");

arrayList.clear();

x = 0;

}

else if(x == 3){

field.setText(result);

x = 3;

}

else if(x == 4){

result ="";

sb.delete(0,sb.length());

arrayList.clear();

x = 3;

}

else {

try{

arrayList.add(sb.toString());

arrayList = getResult(arrayList);

result = arrayList.get(0);

field.setText(result);

arrayList.clear();

x = 3;

}catch(Exception e1){

field.setText("数据格式异常");

x = 0;

}

else if("CLEAR".equals(str)){

arrayList.clear();

field.setText("0");

arrayList.add("0");

x = 4;

}

else{

if(result.length()1){

result = result.substring(0,result.length()-1);

if(sb.length()0){

sb.delete(sb.length()-1,sb.length());

}

else {

sb.delete(0,1);

}

field.setText(result);

x = 5;

}

else{

result = "";

sb.delete(0,sb.length());

arrayList.clear();

field.setText("0");

x = 0;

}

public static ArrayListString getResult(ArrayListString list){

String res = null;

String[] s = {"/","*","-","+"};

int i=0;

if(list.size()1){

for(;is.length;){

if(s[i].equals("/")){

for(int j=0;jlist.size();j++){

if(list.get(j).equals(s[i])){

res = Double.toString(Double.parseDouble(list.get(j-1))/Double.parseDouble(list.get(j+1)));

//本地的数据格式

NumberFormat nf = NumberFormat.getInstance();

res = nf.format(Double.parseDouble(res));

res = getChange(res);

list.set(j-1,res);

list.remove(j);

getResult(list);

}

i++;

}

else if(s[i].equals("*")){

for(int j=0;jlist.size();j++){

if(list.get(j).equals(s[i])){

res = Double.toString(Double.parseDouble(list.get(j-1))*Double.parseDouble(list.get(j+1)));

NumberFormat nf = NumberFormat.getInstance();

res = nf.format(Double.parseDouble(res));

res = getChange(res);

list.set(j-1,res);

list.remove(j);

getResult(list);

}

i++;

}

else if(s[i].equals("-")){

for(int j=0;jlist.size();j++){

if(list.get(j).equals(s[i])){

res = Double.toString(Double.parseDouble(list.get(j-1))-Double.parseDouble(list.get(j+1)));

NumberFormat nf = NumberFormat.getNumberInstance();

res = nf.format(Double.parseDouble(res));

res = getChange(res);

list.set(j-1,res);

list.remove(j);

getResult(list);

}

i++;

}

else {

for(int j=0;jlist.size();j++){

if(list.get(j).equals(s[i])){

res = Double.toString(Double.parseDouble(list.get(j-1))+Double.parseDouble(list.get(j+1)));

NumberFormat nf = NumberFormat.getInstance();

res = nf.format(Double.parseDouble(res));

res = getChange(res);

list.set(j-1,res);

list.remove(j);

getResult(list);

}

i++;

}

return list;

}

//对数字字符串进行排除不必要符号

public static String getChange(String res){

String s_temp = "";

char[] c = new char[res.length()];

for(int k=0;kc.length;k++){

c[k] = res.charAt(k);

}

for(int k=0;kc.length;k++){

if((c[k]= '0' c[k]= '9')|| c[k] == '.'){

s_temp += c[k];

}

return s_temp;

}

public static void main(String[] args){

new CalculatorA().showMi();

}

亲戚称呼计算器java代码

计算器java代码

import java.awt.BorderLayout;

import java.awt.Dimension;

import java.awt.GridLayout;

import java.awt.Toolkit;

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

import javax.swing.JButton;

import javax.swing.JFrame;

import javax.swing.JPanel;

import javax.swing.SwingUtilities;

import javax.swing.UIManager;

class CalculatorPanel extends JPanel {

private JPanel jp; // 中间的面板

private double result; // 计算结果

private boolean start; // 用于判断是否是首次输入,true首次,false不是首次

private boolean flag; // 用于判断是否清空显示区域的值,true需要,false不需要

private String lastCommand; // 用于保存运算符

JButton display; // 显示区域

public CalculatorPanel() {

// 初始化各项值

result = 0;

start = true;

flag = false;

lastCommand = "=";

// 设置CalculatorPanel这个面板的布局为框架布局

setLayout(new BorderLayout());

// 这个按钮用来显示值的区域

display = new JButton("0.0");

display.setEnabled(false);// 按钮样式设置为禁用样式

// 用来初始化,清除用的

JButton clear = new JButton("clear");

clear.addActionListener(new ActionListener() {

@Override

public void actionPerformed(ActionEvent e) {

// 作初始化的操作

result = 0;

start = true;

flag = false;

lastCommand = "=";

display.setText("0.0");

}

});

jp = new JPanel();

// 将此面板布局设置为网格布局,4行4列

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

// 实例化监听器对象

NumberAction na = new NumberAction();

CommandAction ca = new CommandAction();

makeButton("7", na);

makeButton("8", na);

makeButton("9", na);

makeButton("/", ca);

makeButton("4", na);

makeButton("5", na);

makeButton("6", na);

makeButton("*", ca);

makeButton("1", na);

makeButton("2", na);

makeButton("3", na);

makeButton("-", ca);

makeButton("0", na);

makeButton(".", na);

makeButton("+", ca);

makeButton("=", ca);

// 将面板,两个按键加入到我的面板,实现计算器的界面

add(display, BorderLayout.NORTH);

add(jp, BorderLayout.CENTER);

add(clear, BorderLayout.SOUTH);

}

private void makeButton(String buttonName, ActionListener al) {

JButton jb = new JButton(buttonName);

jp.add(jb);

jb.addActionListener(al);

}

// 数字监听器

private class NumberAction implements ActionListener {

@Override

public void actionPerformed(ActionEvent e) {

JButton jb = (JButton) e.getSource(); // 获取事件源对象

String input = jb.getText(); // 获取事件源对象上的标签

if (start) { // 首次输入

// 一上就".",就什么也不做

if (input.equals(".")) {

return;

}

// 如果是"0.0"的话,就清空

if (display.getText().equals("0.0")) {

display.setText("");

}

start = false;// 改变是否首次输入的标记值

} else {

// 判断显示区域的值里面是否已经有".",如果有,输入的又是".",就什么都不做

if (display.getText().indexOf(".") != -1) {

if (input.equals(".")) {

return;

}

// 判断显示区域的值里面只有"-",输入的又是".",就什么都不做

if (display.getText().equals("-")) {

if (input.equals(".")) {

return;

}

// 判断显示区域的值如果是"0",输入的不是".",就什么也不做

if (display.getText().equals("0")) {

if (!input.equals(".")) {

return;

}

// 如果我点击了运算符以后,再输入数字的话,就要清空显示区域的值

if (flag) {

display.setText("");

flag = false;// 还原初始值,不需要清空

}

display.setText(display.getText() + input);// 设置显示区域的值

}

// 运算符监听器

private class CommandAction implements ActionListener {

@Override

public void actionPerformed(ActionEvent e) {

JButton jb = (JButton) e.getSource(); // 获取事件源对象

String inputCommand = jb.getText(); // 获取事件源对象上的标签

if (start) {// 首次输入

// 一上就是"-"

if (inputCommand.equals("-")) {

display.setText("-");// 显示区域的内容设置为"-"

start = false;// 改变首次输入的标记

}

} else {

if (!flag) {// 如果flag=false不需要清空显示区的值,就调用方法计算

calculate(Double.parseDouble(display.getText()));// 保存显示区域的值,并计算

}

// 保存你点击的运算符

lastCommand = inputCommand;

flag = true;// 因为我这里已经输入过运算符,

}

// 计算用的方法

private void calculate(double x) {

if (lastCommand.equals("+")) {

result += x;

} else if (lastCommand.equals("-")) {

result -= x;

} else if (lastCommand.equals("*")) {

result *= x;

} else if (lastCommand.equals("/")) {

result /= x;

} else if (lastCommand.equals("=")) {

result = x;

}

display.setText("" + result);

}

class MyFrameUitl {

public static void init(JFrame jFrame, Dimension frameSize, String title,

String iconFileName, boolean resizable) {

Toolkit tk = Toolkit.getDefaultToolkit(); // 系统工具包,可以读取系统信息

Dimension screenSize = tk.getScreenSize();// 获取屏幕大小

// 获取宽高

int screenWidth = screenSize.width;

int screenHeight = screenSize.height;

// 找中心点

int centerX = screenWidth / 2;

int centerY = screenHeight / 2;

// 解析窗体大小

int frameWidth = frameSize.width;

int frameHeight = frameSize.height;

// 设置窗体位置

jFrame.setBounds(centerX - frameWidth / 2, centerY - frameHeight / 2,

frameWidth, frameHeight);

jFrame.setTitle(title);// 设置标题

if (iconFileName != null) {

jFrame.setIconImage(tk.getImage(iconFileName));// 设置图标

}

// 设置皮肤com.sun.java.swing.plaf.windows.WindowsLookAndFeel

/**/

try {

UIManager.setLookAndFeel("com.sun.java.swing.plaf.windows.WindowsLookAndFeel");

SwingUtilities.updateComponentTreeUI(jFrame);

} catch (Exception e1) {

e1.printStackTrace();

}

jFrame.setResizable(resizable);// 设置窗体是否可以改变大小

jFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); // 设置程序关闭动作

jFrame.setVisible(true);// 显示窗体

}

class CalculatorFrame extends JFrame {

public CalculatorFrame() {

add(new CalculatorPanel());

MyFrameUitl.init(this, new Dimension(400, 300), "简易计算器", null,

false);

this.pack();// 让组件按原始大小显示,并且窗体的大小刚好能够容纳所有的组件

}

public class CalculatorTest {

public static void main(String[] args) {

new CalculatorFrame();

}

运行效果：

用java实现一个简单的计算器。

* @(#)JCalculator.java 1.00 06/17/2015

import java.awt.*;

import java.awt.event.*;

import javax.swing.*;

/**

* A simple calculator program.

* pI saw this program in a QQ group, and help a friend correct it./p

* @author Singyuen Yip

* @version 1.00 12/29/2009

* @see JFrame

* @see ActionListener

public class JCalculator extends JFrame implements ActionListener {

/**

* Serial Version UID

private static final long serialVersionUID = -169068472193786457L;

/**

* This class help close the Window.

* @author Singyuen Yip

private class WindowCloser extends WindowAdapter {

public void windowClosing(WindowEvent we) {

System.exit(0);

}

int i;

// Strings for Digit Operator buttons.

private final String[] str = { "7", "8", "9", "/", "4", "5", "6", "*","1",

"2", "3", "-", ".", "0", "=", "+" };

// Build buttons.

JButton[] buttons = new JButton[str.length];

// For cancel or reset.

JButton reset = new JButton("CE");

// Build the text field to show the result.

JTextField display = new JTextField("0");

/**

* Constructor without parameters.

public JCalculator() {

super("Calculator");

// Add a panel.

JPanel panel1 = new JPanel(new GridLayout(4, 4));

// panel1.setLayout(new GridLayout(4,4));

for (i = 0; i str.length; i++) {

buttons[i] = new JButton(str[i]);

panel1.add(buttons[i]);

}

JPanel panel2 = new JPanel(new BorderLayout());

// panel2.setLayout(new BorderLayout());

panel2.add("Center", display);

panel2.add("East", reset);

// JPanel panel3 = new Panel();

getContentPane().setLayout(new BorderLayout());

getContentPane().add("North", panel2);

getContentPane().add("Center", panel1);

// Add action listener for each digit operator button.

for (i = 0; i str.length; i++)

buttons[i].addActionListener(this);

// Add listener for "reset" button.

reset.addActionListener(this);

// Add listener for "display" button.

display.addActionListener(this);

// The "close" button "X".

addWindowListener(new WindowCloser());

// Initialize the window size.

setSize(800, 800);

// Show the window.

// show(); Using show() while JDK version is below 1.5.

setVisible(true);

// Fit the certain size.

pack();

}

public void actionPerformed(ActionEvent e) {

Object target = e.getSource();

String label = e.getActionCommand();

if (target == reset)

handleReset();

else if ("0123456789.".indexOf(label) 0)

handleNumber(label);

else

handleOperator(label);

}

// Is the first digit pressed?

boolean isFirstDigit = true;

/**

* Number handling.

* @param key the key of the button.

public void handleNumber(String key) {

if (isFirstDigit)

display.setText(key);

else if ((key.equals(".")) (display.getText().indexOf(".") 0))

display.setText(display.getText() + ".");

else if (!key.equals("."))

display.setText(display.getText() + key);

isFirstDigit = false;

}

/**

* Reset the calculator.

public void handleReset() {

display.setText("0");

isFirstDigit = true;

operator = "=";

}

double number = 0.0;

String operator = "=";

/**

* Handling the operation.

* @param key pressed operator's key.

public void handleOperator(String key) {

if (operator.equals("+"))

number += Double.valueOf(display.getText());

else if (operator.equals("-"))

number -= Double.valueOf(display.getText());

else if (operator.equals("*"))

number *= Double.valueOf(display.getText());

else if (operator.equals("/"))

number /= Double.valueOf(display.getText());

else if (operator.equals("="))

number = Double.valueOf(display.getText());

display.setText(String.valueOf(number));

operator = key;

isFirstDigit = true;

}

public static void main(String[] args) {

new JCalculator();

}

运行界面：

用java语言,编写一个计算器

有一个现成的.你看看吧

import java.awt.event.ActionEvent;

public class Application extends JFrame {

protected String str = "";

protected boolean isChar = true;

protected boolean isEqual = false;

protected JTextField textField;

public Application() {

Listener listerner = new Listener(this);

getContentPane().setLayout(null);

JButton button = new JButton("7");

button.addActionListener(listerner);

button.setBounds(12, 69, 43, 27);

getContentPane().add(button);

textField = new JTextField();

textField.setText("0");

textField.setEditable(false);

textField.setHorizontalAlignment(JTextField.RIGHT);

textField.setBounds(12, 22, 377, 27);

getContentPane().add(textField);

textField.setColumns(10);

JButton button_1 = new JButton("8");

button_1.addActionListener(listerner);

button_1.setBounds(103, 69, 43, 27);

getContentPane().add(button_1);

JButton button_2 = new JButton("9");

button_2.addActionListener(listerner);

button_2.setBounds(182, 69, 43, 27);

getContentPane().add(button_2);

JButton button_3 = new JButton("4");

button_3.addActionListener(listerner);

button_3.setBounds(12, 106, 43, 27);

getContentPane().add(button_3);

JButton button_4 = new JButton("5");

button_4.addActionListener(listerner);

button_4.setBounds(103, 106, 43, 27);

getContentPane().add(button_4);

JButton button_5 = new JButton("6");

button_5.addActionListener(listerner);

button_5.setBounds(182, 106, 43, 27);

getContentPane().add(button_5);

JButton button_6 = new JButton("1");

button_6.addActionListener(listerner);

button_6.setBounds(12, 143, 43, 27);

getContentPane().add(button_6);

JButton button_7 = new JButton("2");

button_7.addActionListener(listerner);

button_7.setBounds(103, 143, 43, 27);

getContentPane().add(button_7);

JButton button_8 = new JButton("3");

button_8.addActionListener(listerner);

button_8.setBounds(182, 143, 43, 27);

getContentPane().add(button_8);

JButton button_9 = new JButton("+");

button_9.addActionListener(listerner);

button_9.setBounds(269, 72, 43, 27);

getContentPane().add(button_9);

JButton button_10 = new JButton("-");

button_10.addActionListener(listerner);

button_10.setBounds(346, 72, 43, 27);

getContentPane().add(button_10);

JButton button_11 = new JButton("*");

button_11.addActionListener(listerner);

button_11.setBounds(269, 109, 43, 27);

getContentPane().add(button_11);

JButton button_12 = new JButton("/");

button_12.addActionListener(listerner);

button_12.setBounds(346, 109, 43, 27);

getContentPane().add(button_12);

JButton button_13 = new JButton("=");

button_13.addActionListener(listerner);

button_13.setBounds(346, 143, 43, 27);

getContentPane().add(button_13);

JButton button_14 = new JButton("0");

button_14.addActionListener(listerner);

button_14.setBounds(103, 180, 43, 27);

getContentPane().add(button_14);

JButton btnReset = new JButton("reset");

btnReset.addActionListener(listerner);

btnReset.setBounds(269, 180, 118, 27);

getContentPane().add(btnReset);

JButton button_15 = new JButton(".");

button_15.addActionListener(listerner);

button_15.setBounds(269, 146, 43, 27);

getContentPane().add(button_15);

this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

this.setResizable(false);

this.setSize(442, 260);

this.setLocationRelativeTo(null);

this.setVisible(true);

}

public static void main(String[] args) {

new Application();

}

class Listener implements ActionListener {

private Application app = null;

public Listener(Application app) {

this.app = app;

}

public void actionPerformed(ActionEvent e) {

String value = e.getActionCommand();

if (value.matches("[0-9.]")) {

if (app.isChar) {

app.textField.setText("");

app.isChar = false;

}

if (app.isEqual app.str.matches("[0-9.]*")) {

app.str = "";

app.isEqual = false;

}

app.str += value;

app.textField.setText(app.textField.getText() + value);

} else if (value.matches("[\\+\\-\\*/]")) {

if (!app.str.substring(app.str.length() - 1)

.matches("[\\+\\-\\*/]")) {

app.str += value;

app.isChar = true;

}

} else if ("=".equals(value)) {

app.isEqual = true;

if (app.str.substring(app.str.length() - 1).matches("[\\+\\-]")) {

app.str += "0";

} else if (app.str.substring(app.str.length() - 1)

.matches("[\\*/]")) {

app.str += "1";

}

Interpreter bsh = new Interpreter();

String obj = null;

try {

obj = bsh.eval(app.str).toString();

} catch (Exception exception) {

System.out.println(exception.getMessage());

}

System.out.println(app.str);

app.textField.setText(obj);

app.str = obj;

app.isChar = true;

} else {

app.str = "";

app.textField.setText("0");

}

用JAVA编写一个计算器

import java.awt.BorderLayout;

import java.awt.Color;

import java.awt.GridLayout;

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

import javax.swing.ImageIcon;

import javax.swing.JButton;

import javax.swing.JFrame;

import javax.swing.JPanel;

import javax.swing.JTextField;

import javax.swing.SwingConstants;

public class Jisuanqi extends JFrame implements ActionListener {

/**

private static final long serialVersionUID = 1L;

Result result = new Result(); // 定义text的面板

Number_Key number_key = new Number_Key(); // 定义按钮面板

// 当点击按钮+、-、*、/时，com = true

boolean com = false;

// 当i=0时说明是我们第一次输入，字符串text不会累加

int i = 0;

// 存放text的内容

String text = "";

// 存放点击按钮+、-、*、/之前的数值

double defbutton = 0;

// +、-、*、/的代号分别为1，2，3，4

int symbol = 0;

// 构造函数

Jisuanqi() {

super("WangJiao"); // 设定标题

setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); // 设定关闭窗体时退出程序

JPanel pane = new JPanel(); // 定义主面板

pane.setLayout(new BorderLayout());

setBounds(380, 220, 30, 80); // 前两个参数是在屏幕上显示的坐标，后两个是大小

// 替换图标

ImageIcon icon = new ImageIcon("F:1.GIF");

// Jisuanqi.class.getResource("APPLE.GIF")

// );

setIconImage(icon.getImage());

pane.add(result, BorderLayout.NORTH);

pane.add(number_key, BorderLayout.CENTER);

pane.add(number_key.equal, BorderLayout.SOUTH);

number_key.one.addActionListener(this); // 对1按钮添加监听事件

number_key.two.addActionListener(this); // 对2按钮添加监听事件

number_key.three.addActionListener(this); // 对3按钮添加监听事件

number_key.four.addActionListener(this); // 对4按钮添加监听事件

number_key.five.addActionListener(this); // 对5按钮添加监听事件

number_key.six.addActionListener(this); // 对6按钮添加监听事件

number_key.seven.addActionListener(this); // 对7按钮添加监听事件

number_key.eight.addActionListener(this); // 对8按钮添加监听事件

number_key.nine.addActionListener(this); // 对9按钮添加监听事件

number_key.zero.addActionListener(this); // 对0按钮添加监听事件

number_key.ce.addActionListener(this); // 对置零按钮添加监听事件

number_key.plus.addActionListener(this); // 对+按钮添加监听事件

number_key.equal.addActionListener(this); // 对=按钮添加监听事件

number_key.sub.addActionListener(this); // 对-按钮添加监听事件

number_key.mul.addActionListener(this); // 对*按钮添加监听事件

number_key.div.addActionListener(this); // 对/按钮添加监听事件

number_key.point.addActionListener(this); // 对.按钮添加监听事件

setContentPane(pane);

pack(); // 初始化窗体大小为正好盛放所有按钮

}

// 各个按钮触发的事件

public void actionPerformed(ActionEvent e) {

* 如果是点击数字按钮那么先要判断是否在此之前点击了+、-、*、/、=，如果是那么com=true 如果没有com=

* false;或者是否点击数字键，如果是i = 1,如果没有 i = 0;

if (e.getSource() == number_key.one) {

if (com || i == 0) {

result.text.setText("1");

com = false;

i = 1;

} else {

text = result.text.getText();

result.text.setText(text + "1");

}

} else if (e.getSource() == number_key.two) {

if (com || i == 0) {

result.text.setText("2");

com = false;

i = 1;

} else {

text = result.text.getText();

result.text.setText(text + "2");

}

} else if (e.getSource() == number_key.three) {

if (com || i == 0) {

result.text.setText("3");

com = false;

i = 1;

} else {

text = result.text.getText();

result.text.setText(text + "3");

}

} else if (e.getSource() == number_key.four) {

if (com || i == 0) {

result.text.setText("4");

com = false;

i = 1;

} else {

text = result.text.getText();

result.text.setText(text + "4");

}

} else if (e.getSource() == number_key.five) {

if (com || i == 0) {

result.text.setText("5");

com = false;

i = 1;

} else {

text = result.text.getText();

result.text.setText(text + "5");

}

} else if (e.getSource() == number_key.six) {

if (com || i == 0) {

result.text.setText("6");

com = false;

i = 1;

} else {

text = result.text.getText();

result.text.setText(text + "6");

}

} else if (e.getSource() == number_key.seven) {

if (com || i == 0) {

result.text.setText("7");

com = false;

i = 1;

} else {

text = result.text.getText();

result.text.setText(text + "7");

}

} else if (e.getSource() == number_key.eight) {

if (com || i == 0) {

result.text.setText("8");

com = false;

i = 1;

} else {

text = result.text.getText();

result.text.setText(text + "8");

}

} else if (e.getSource() == number_key.nine) {

if (com || i == 0) {

result.text.setText("9");

com = false;

i = 1;

} else {

text = result.text.getText();

result.text.setText(text + "9");

}

* 对于0这个按钮有一定的说法，在我的程序里不会出现如00000这样的情况，我加了判断条件就是

* 如果text中的数值=0就要判断在这个数值中是否有.存在?如果有那么就在原来数值基础之上添加0;否则保持原来的数值不变

else if (e.getSource() == number_key.zero) { // result.text.getText()是得到text里内容的意思

if (com || i == 0) {

result.text.setText("0");

com = false;

i = 1;

} else {

text = result.text.getText();

if (Float.parseFloat(text) 0 || Float.parseFloat(text) 0) { // Float.parseFloat(text)就是类型转换了，下面都是一样

result.text.setText(text + "0");

} else {

if (text.trim().indexOf(".") == -1) {

result.text.setText(text);

} else {

result.text.setText(text + "0");

}

} else if (e.getSource() == number_key.ce) {

result.text.setText("0");

i = 0;

com = true;

// text = "";

defbutton = 0;

}

* 本程序不会让一个数值中出现2个以上的小数点.具体做法是:判断是否已经存在.存在就不添加, 不存在就添加.

else if (e.getSource() == number_key.point) {

if (com || i == 0) {

result.text.setText("0.");

com = false;

i = 1;

} else {

text = result.text.getText();

if (text.trim().indexOf(".") == -1) {

result.text.setText(text + ".");

} else {

result.text.setText(text);

}

} // 获得点击+之前的数值

else if (e.getSource() == number_key.plus) {

com = true;

i = 0;

defbutton = Double.parseDouble(result.text.getText());

symbol = 1;

} // 获得点击-之前的数值

else if (e.getSource() == number_key.sub) {

com = true;

i = 0;

defbutton = Double.parseDouble(result.text.getText());

symbol = 2;

} // 获得点击*之前的数值

else if (e.getSource() == number_key.mul) {

com = true;

i = 0;

defbutton = Double.parseDouble(result.text.getText());

System.out.println(defbutton);

symbol = 3;

} // 获得点击/之前的数值

else if (e.getSource() == number_key.div) {

com = true;

i = 0;

defbutton = Double.parseDouble(result.text.getText());

symbol = 4;

} else if (e.getSource() == number_key.equal) {

switch (symbol) {

case 1: { // 计算加法

double ad = defbutton

+ Double.parseDouble(result.text.getText());

result.text.setText(ad + "");

i = 0;

text = "";

break;

}

case 2: { // 计算减法

double ad = defbutton

- Double.parseDouble(result.text.getText());

result.text.setText(String.valueOf(ad));

i = 0;

text = "";

break;

}

case 3: { // 计算乘法

double ad = defbutton

* Double.parseDouble(result.text.getText());

result.text.setText(ad + "");

i = 0;

text = "";

break;

}

case 4: { // 计算除法

double ad = defbutton

/ Double.parseDouble(result.text.getText());

result.text.setText(ad + "");

i = 0;

text = "";

break;

}

System.out.println(com);

}

System.out.println(result.text.getText());

}

@SuppressWarnings("deprecation")

public static void main(String[] args) {

Jisuanqi loveyou = new Jisuanqi();

loveyou.show();

}

// 计算器数字按钮定义面板

class Number_Key extends JPanel {

/**

private static final long serialVersionUID = 1L;

JButton zero = new JButton("0"); // 数字键0

JButton one = new JButton("1"); // 数字键1

JButton two = new JButton("2"); // 数字键2

JButton three = new JButton("3"); // 数字键3

JButton four = new JButton("4"); // 数字键4

JButton five = new JButton("5"); // 数字键5

JButton six = new JButton("6"); // 数字键6

JButton seven = new JButton("7"); // 数字键7

JButton eight = new JButton("8"); // 数字键8

JButton nine = new JButton("9"); // 数字键9

JButton plus = new JButton("+");

JButton sub = new JButton("-");

JButton mul = new JButton("*");

JButton div = new JButton("/");

JButton equal = new JButton("=");

JButton ce = new JButton("清零"); // 置零键

JButton point = new JButton(".");

Number_Key() {

setLayout(new GridLayout(4, 4, 1, 1)); // 定义布局管理器为网格布局

setBackground(Color.blue); // 设置背景颜色

// 添加按钮

add(one);

add(two);

add(three);

add(four);

add(five);

add(six);

add(seven);

add(eight);

add(nine);

add(zero);

add(plus);

add(sub);

add(mul);

add(div);

add(point);

add(equal);

add(ce);

}

// 计算器显示结果的窗体

class Result extends JPanel {

/**

private static final long serialVersionUID = 1L;

// text先是输入和结果

JTextField text = new JTextField("0");

@SuppressWarnings("deprecation")

Result() { // 讲输入的数字或得到的结果在text的右边显示

text.setHorizontalAlignment(SwingConstants.RIGHT);

text.enable(false); // 文本框不能编辑

setLayout(new BorderLayout()); // 设定布局管理器边框布局

add(text, BorderLayout.CENTER); // text放置在窗体的中间

}

直接复制保存成Jisuanqi .java可以直接运行了

网站栏目：java代码写亲戚计算器最简单java计算器代码
转载源于：http://pwwzsj.com/article/dossppo.html

平武建站

java代码写亲戚计算器最简单java计算器代码

如何用JAVA语言编写计算器小程序？

JAVA 编写计算器要代码最简单的

亲戚称呼计算器java代码

用java实现一个简单的计算器。

用java语言,编写一个计算器

用JAVA编写一个计算器

其他资讯

java代码写亲戚计算器 最简单java计算器代码

如何用JAVA语言编写计算器小程序？

JAVA 编写计算器 要代码最简单的

亲戚称呼计算器java代码

用java实现一个简单的计算器。

用java语言,编写一个计算器

用JAVA编写一个计算器

其他资讯

java代码写亲戚计算器最简单java计算器代码

JAVA 编写计算器要代码最简单的