import java.awt.event.*
import javax.swing.*
public class 计算器 extends JFrame implements ActionListener {
private final String[] KEYS = { "7", "8", "9", "÷", "sqrt", "4", "5", "6",
"×", "%", "1", "2", "3", "-", "1/x", "0", "+/-", ".", "+", "=" }
private final String[] COMMAND = { "Backspace", "CE", "C" }
private final String[] M = { " ", "MC", "MR", "MS", "M+" }
private JButton keys[] = new JButton[KEYS.length]
private JButton commands[] = new JButton[COMMAND.length]
private JButton m[] = new JButton[M.length]
private JTextField resultText = new JTextField()
private boolean firstDigit = true
private double resultNum = 0.0
private String operator = "="
static double mr// 记忆的数字
private boolean operateValidFlag = true
JPanel panel[]=new JPanel[4]
public 计算器(){
super("计算器")
init()
setBackground(Color.LIGHT_GRAY)
setResizable(false)
setLocation(588, 250)
setSize(378,214)
setDefaultCloseOperation(DO_NOTHING_ON_CLOSE) //窗口不能直接关闭
setVisible(true)
addWindowListener( new WindowAdapter() {
public void windowClosing(WindowEvent e){
if (JOptionPane.showConfirmDialog(null,"确定退出? ", "提示",2)==0){
System.exit(0)
}}})
}
private void init() {
setLayout(null)
for (int i = 0i <4i++) {
panel[i]=new JPanel()
add(panel[i])
}
panel[0].setLayout(new GridLayout(1,1,3,3))
panel[1].setLayout(new GridLayout(1,3,3,3))
panel[2].setLayout(new GridLayout(5,1,3,3))
panel[3].setLayout(new GridLayout(4,5,3,3))
resultText.setHorizontalAlignment(JTextField.RIGHT)
resultText.setAlignmentX(50)
resultText.setEditable(true)
resultText.setFont(new Font("宋体",Font.PLAIN,19))//设置字体
resultText.setBackground(Color.white)
panel[0].add(resultText)
for (int i = 0i <KEYS.lengthi++) {
keys[i] = new JButton(KEYS[i])
panel[3].add(keys[i])
if (i%5-3==0){ keys[i].setForeground(Color.red)}
else{keys[i].setForeground(Color.black)}
keys[i].setVisible(true)
keys[i].setFont(new Font(null,Font.PLAIN,17))//设置字体
keys[i].addActionListener(this)
keys[i].setHorizontalAlignment(keys[i].CENTER)
keys[i].setBackground(new Color(255,236,233))
}
keys[4].setFont(new Font(null,Font.PLAIN,13))//设置字体
keys[19].setForeground(Color.red)
for (int i = 0i <COMMAND.lengthi++) {
commands[i] = new JButton(COMMAND[i])
panel[1].add(commands[i])
commands[i].setForeground(Color.red)
commands[i].addActionListener(this)
}
commands[0].setFont(new Font(null,Font.PLAIN,12))//设置字体
for (int i = 0i <M.lengthi++) {
m[i] = new JButton(M[i])
panel[2].add(m[i])
m[i].setForeground(Color.red)
m[i].addActionListener(this)
}
panel[0].setBounds(2, 0, 370, 30)
panel[1].setBounds(74, 30, 298, 29)
panel[2].setBounds(2,30, 70, 150)
panel[3].setBounds(74,60, 300, 120)
validate()
}
public void actionPerformed(ActionEvent e) {
String label = e.getActionCommand()
if (label.equals(COMMAND[0])){ //用户按了"Backspace"键
handleBackspace()
} else if (label.equals(COMMAND[1])) { //用户按了"CE"键
resultText.setText("0")
} else if (label.equals(COMMAND[2])){ //用户按了"C"键
handleC()
} else if (label.equals(M[4])){ //用户按了"M+"键
mr=mr+Double.valueOf(resultText.getText()).doubleValue()
if (mr==0.0){m[0].setText("")}
else {m[0].setText("M")}
} else if (label.equals(M[3])){ //用户按了"MS"键
mr=Double.valueOf(resultText.getText()).doubleValue()
if (mr==0.0){m[0].setText("")}
} else if (label.equals(M[2])){ //用户按了"MR"键
resultText.setText(""+mr)
} else if (label.equals(M[1])){ //用户按了"MC"键
mr=0.0
m[0].setText("")
} else if (label.equals("sqrt")) { //平方根运算
resultNum = Math.sqrt(Double.valueOf(resultText.getText()).doubleValue())
resultText.setText(String.valueOf(resultNum))
} else if (label.equals("%")){ //百分号运算,除以100
resultNum = Double.valueOf(resultText.getText()).doubleValue() / 100
resultText.setText(String.valueOf(resultNum))
} else if (label.equals("+/-")){ //正数负数运算
resultNum = Double.valueOf(resultText.getText()).doubleValue() * (-1)
resultText.setText(String.valueOf(resultNum))
} else if (label.equals("1/x")) { //倒数运算
resultNum=Double.valueOf(resultText.getText()).doubleValue()
if (resultNum == 0.0){ //操作不合法
operateValidFlag = false
resultText.setText("零没有倒数")
} else {
resultNum = 1 / resultNum
}
resultText.setText(String.valueOf(resultNum))
} else if ("0123456789.".indexOf(label) >= 0) { //用户按了数字键或者小数点键
handleNumber(label)
} else { //用户按了运算符键
handleOperator(label)
}
}
private void handleBackspace() { // 处理Backspace键被按下的事件
String text = resultText.getText()
int i = text.length()
if (i >0) { //退格,将文本最后一个字符去掉
text = text.substring(0, i - 1)
if (text.length() == 0) { //如果文本没有了内容,则初始化计算器的各种值
resultText.setText("0")
firstDigit = true
operator = "="
} else { //显示新的文本
resultText.setText(text)
}
}
}
private void handleNumber(String key) { // 处理数字键被按下的事件
if (firstDigit) { //输入的第一个数字
resultText.setText(key)
} else if ((key.equals(".")) &&(resultText.getText().indexOf(".") <0)){
//输入的是小数点,并且之前没有小数点,则将小数点附在结果文本框的后面
resultText.setText(resultText.getText() + ".")
} else if (!key.equals(".")) { //如果输入的不是小数点,则将数字附在结果文本框的后面
resultText.setText(resultText.getText() + key)
}
firstDigit = false//以后输入的肯定不是第一个数字了
}
private void handleC() { //处理C键被按下的事件, 初始化计算器的各种值
resultText.setText("0")
firstDigit = true
operator = "="
}
private void handleOperator(String key) { //处理运算符键被按下的事件
if (operator.equals("÷")) { //除法运算 ,如果当前结果文本框中的值等于0
if (getNumberFromText() == 0.0){ //操作不合法
operateValidFlag = false
resultText.setText("除数不能为零")
} else {
resultNum /= getNumberFromText()
}
} else if (operator.equals("+")){ //加法运算
resultNum += getNumberFromText()
} else if (operator.equals("-")){ //减法运算
resultNum -= getNumberFromText()
} else if (operator.equals("×")){ //乘法运算
resultNum *= getNumberFromText()
} else if (operator.equals("=")){ //赋值运算
resultNum = getNumberFromText()
}
if (operateValidFlag) { //双精度浮点数的运算
long t1
double t2
t1 = (long) resultNum
t2 = resultNum - t1
if (t2 == 0) {
resultText.setText(String.valueOf(t1))
} else {
resultText.setText(String.valueOf(resultNum))
}
}
operator = key //运算符等于用户按的按钮
firstDigit = true
operateValidFlag = true
}
private double getNumberFromText() { // 从结果文本框中获取数字
double result = 0
try {
result = Double.valueOf(resultText.getText()).doubleValue()
}
catch (NumberFormatException e){ }
return result
}
public static void main(String args[]) {
new 计算器()
}
}
给你一个吧。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.JButton
import javax.swing.JFrame
import javax.swing.JPanel
import javax.swing.JTextField
/**
* 一个计算器,与Windows附件自带计算器的标准版功能、界面相仿。
* 但还不支持键盘操作。
*/
public class Calculator extends JFrame implements ActionListener {
/** 计算器上的键的显示名字 */
private final String[] KEYS = { "7", "8", "9", "/", "sqrt", "4", "5", "6",
"*", "%", "1", "2", "3", "-", "1/x", "0", "+/-", ".", "+", "=" }
/** 计算器上的功能键的显示名字 */
private final String[] COMMAND = { "Backspace", "CE", "C" }
/** 计算器左边的M的显示名字 */
private final String[] M = { " ", "MC", "MR", "MS", "M+" }
/** 计算器上键的按钮 */
private JButton keys[] = new JButton[KEYS.length]
/** 计算器上的功能键的按钮 */
private JButton commands[] = new JButton[COMMAND.length]
/** 计算器左边的M的按钮 */
private JButton m[] = new JButton[M.length]
/** 计算结果文本框 */
private JTextField resultText = new JTextField("0")
// 标志用户按的是否是整个表达式的第一个数字,或者是运算符后的第一个数字
private boolean firstDigit = true
// 计算的中间结果。
private double resultNum = 0.0
// 当前运算的运算符
private String operator = "="
// 操作是否合法
private boolean operateValidFlag = true
/**
* 构造函数
*/
public Calculator(){
super()
//初始化计算器
init()
//设置计算器的背景颜色
this.setBackground(Color.LIGHT_GRAY)
this.setTitle("计算器")
//在屏幕(500, 300)坐标处显示计算器
this.setLocation(500, 300)
//不许修改计算器的大小
this.setResizable(false)
//使计算器中各组件大小合适
this.pack()
}
/**
* 初始化计算器
*/
private void init() {
// 文本框中的内容采用右对齐方式
resultText.setHorizontalAlignment(JTextField.RIGHT)
// 不允许修改结果文本框
resultText.setEditable(false)
// 设置文本框背景颜色为白色
resultText.setBackground(Color.white)
//初始化计算器上键的按钮,将键放在一个画板内
JPanel calckeysPanel = new JPanel()
//用网格布局器,4行,5列的网格,网格之间的水平方向间隔为3个象素,垂直方向间隔为3个象素
calckeysPanel.setLayout(new GridLayout(4, 5, 3, 3))
for (int i = 0i <KEYS.lengthi++) {
keys[i] = new JButton(KEYS[i])
calckeysPanel.add(keys[i])
keys[i].setForeground(Color.blue)
}
//运算符键用红色标示,其他键用蓝色表示
keys[3].setForeground(Color.red)
keys[8].setForeground(Color.red)
keys[13].setForeground(Color.red)
keys[18].setForeground(Color.red)
keys[19].setForeground(Color.red)
//初始化功能键,都用红色标示。将功能键放在一个画板内
JPanel commandsPanel = new JPanel()
//用网格布局器,1行,3列的网格,网格之间的水平方向间隔为3个象素,垂直方向间隔为3个象素
commandsPanel.setLayout(new GridLayout(1, 3, 3, 3))
for (int i = 0i <COMMAND.lengthi++) {
commands[i] = new JButton(COMMAND[i])
commandsPanel.add(commands[i])
commands[i].setForeground(Color.red)
}
//初始化M键,用红色标示,将M键放在一个画板内
JPanel calmsPanel = new JPanel()
//用网格布局管理器,5行,1列的网格,网格之间的水平方向间隔为3个象素,垂直方向间隔为3个象素
calmsPanel.setLayout(new GridLayout(5, 1, 3, 3))
for (int i = 0i <M.lengthi++) {
m[i] = new JButton(M[i])
calmsPanel.add(m[i])
m[i].setForeground(Color.red)
}
//下面进行计算器的整体布局,将calckeys和command画板放在计算器的中部,
//将文本框放在北部,将calms画板放在计算器的西部。
//新建一个大的画板,将上面建立的command和calckeys画板放在该画板内
JPanel panel1 = new JPanel()
//画板采用边界布局管理器,画板里组件之间的水平和垂直方向上间隔都为3象素
panel1.setLayout(new BorderLayout(3, 3))
panel1.add("North", commandsPanel)
panel1.add("West", calckeysPanel)
//建立一个画板放文本框
JPanel top = new JPanel()
top.setLayout(new BorderLayout())
top.add("Center", resultText)
//整体布局
getContentPane().setLayout(new BorderLayout(3, 5))
getContentPane().add("North", top)
getContentPane().add("Center", panel1)
getContentPane().add("West", calmsPanel)
//为各按钮添加事件侦听器
//都使用同一个事件侦听器,即本对象。本类的声明中有implements ActionListener
for (int i = 0i <KEYS.lengthi++) {
keys[i].addActionListener(this)
}
for (int i = 0i <COMMAND.lengthi++) {
commands[i].addActionListener(this)
}
for (int i = 0i <M.lengthi++) {
m[i].addActionListener(this)
}
}
/**
* 处理事件
*/
public void actionPerformed(ActionEvent e) {
//获取事件源的标签
String label = e.getActionCommand()
if (label.equals(COMMAND[0])){
//用户按了"Backspace"键
handleBackspace()
} else if (label.equals(COMMAND[1])) {
//用户按了"CE"键
resultText.setText("0")
} else if (label.equals(COMMAND[2])){
//用户按了"C"键
handleC()
} else if ("0123456789.".indexOf(label) >= 0) {
//用户按了数字键或者小数点键
handleNumber(label)
// handlezero(zero)
} else {
//用户按了运算符键
handleOperator(label)
}
}
/**
* 处理Backspace键被按下的事件
*/
private void handleBackspace() {
String text = resultText.getText()
int i = text.length()
if (i >0) {
//退格,将文本最后一个字符去掉
text = text.substring(0, i - 1)
if (text.length() == 0) {
//如果文本没有了内容,则初始化计算器的各种值
resultText.setText("0")
firstDigit = true
operator = "="
} else {
//显示新的文本
resultText.setText(text)
}
}
}
/**
* 处理数字键被按下的事件
* @param key
*/
private void handleNumber(String key) {
if (firstDigit) {
//输入的第一个数字
resultText.setText(key)
} else if ((key.equals(".")) &&(resultText.getText().indexOf(".") <0)){
//输入的是小数点,并且之前没有小数点,则将小数点附在结果文本框的后面
resultText.setText(resultText.getText() + ".")
} else if (!key.equals(".")) {
//如果输入的不是小数点,则将数字附在结果文本框的后面
resultText.setText(resultText.getText() + key)
}
//以后输入的肯定不是第一个数字了
firstDigit = false
}
/**
* 处理C键被按下的事件
*/
private void handleC() {
//初始化计算器的各种值
resultText.setText("0")
firstDigit = true
operator = "="
}
/**
* 处理运算符键被按下的事件
* @param key
*/
private void handleOperator(String key) {
if (operator.equals("/")) {
//除法运算
//如果当前结果文本框中的值等于0
if (getNumberFromText() == 0.0){
//操作不合法
operateValidFlag = false
resultText.setText("除数不能为零")
} else {
resultNum /= getNumberFromText()
}
} else if (operator.equals("1/x")) {
//倒数运算
if (resultNum == 0.0){
//操作不合法
operateValidFlag = false
resultText.setText("零没有倒数")
} else {
resultNum = 1 / resultNum
}
} else if (operator.equals("+")){
//加法运算
resultNum += getNumberFromText()
} else if (operator.equals("-")){
//减法运算
resultNum -= getNumberFromText()
} else if (operator.equals("*")){
//乘法运算
resultNum *= getNumberFromText()
} else if (operator.equals("sqrt")) {
//平方根运算
resultNum = Math.sqrt(resultNum)
} else if (operator.equals("%")){
//百分号运算,除以100
resultNum = resultNum / 100
} else if (operator.equals("+/-")){
//正数负数运算
resultNum = resultNum * (-1)
} else if (operator.equals("=")){
//赋值运算
resultNum = getNumberFromText()
}
if (operateValidFlag) {
//双精度浮点数的运算
long t1
double t2
t1 = (long) resultNum
t2 = resultNum - t1
if (t2 == 0) {
resultText.setText(String.valueOf(t1))
} else {
resultText.setText(String.valueOf(resultNum))
}
}
//运算符等于用户按的按钮
operator = key
firstDigit = true
operateValidFlag = true
}
/**
* 从结果文本框中获取数字
* @return
*/
private double getNumberFromText() {
double result = 0
try {
result = Double.valueOf(resultText.getText()).doubleValue()
} catch (NumberFormatException e){
}
return result
}
public static void main(String args[]) {
Calculator calculator1 = new Calculator()
calculator1.setVisible(true)
calculator1.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE)
}
}
这个可以不。import javax.swing.*
//import javax.swing.event.*
import java.awt.*
import java.awt.event.*
//计算器显示结果的窗体
class Result extends JPanel
{
JTextField text = new JTextField("0") //text先是输入和结果
Result()
{
text.setHorizontalAlignment(SwingConstants.RIGHT) //讲输入的数字或得到的结果在text的右边显示
text.setEnabled(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
}
}
//计算器数字按钮定义面板
class Number_Key extends JPanel
{
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("ce")//置零键
JButton point = new JButton(".")
JButton tzero = new JButton("00")
Number_Key()
{
setLayout(new GridLayout(6, 3, 10, 10))//定义布局管理器为网格布局
//添加各个按钮键
add(seven)
add(eight)
add(nine)
add(four)
add(five)
add(six)
add(one)
add(two)
add(three)
add(zero)
add(tzero)
add(plus)
add(sub)
add(mul)
add(div)
add(point)
add(equal)
add(ce)
}
}
//计算器主类
class sakura extends JFrame implements ActionListener
{
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sum不会累加
int i = 0
//存放text的内容
String sum = ""
//存放点击按钮+、-、*、/之前的数值
double total = 0
//+、-、*、/的代号分别为1,2,3,4
int symbol = 0
sakura()
{
super("Calculator")//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())
pane.add(result, BorderLayout.NORTH)
pane.add(number_key, 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.tzero.addActionListener(this)//对00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
{
sum = result.text.getText()
result.text.setText(sum + "1")
}
}
else if (e.getSource() == number_key.two)
{
if (com || i == 0)
{
result.text.setText("2")
com = false
i = 1
}
else
{
sum = result.text.getText()
result.text.setText(sum + "2")
}
}
else if (e.getSource() == number_key.three)
{
if (com || i == 0)
{
result.text.setText("3")
com = false
i = 1
}
else
{
sum = result.text.getText()
result.text.setText(sum + "3")
}
}
else if (e.getSource() == number_key.four)
{
if (com || i == 0)
{
result.text.setText("4")
com = false
i = 1
}
else
{
sum = result.text.getText()
result.text.setText(sum + "4")
}
}
else if (e.getSource() == number_key.five)
{
if (com || i == 0)
{
result.text.setText("5")
com = false
i = 1
}
else
{
sum = result.text.getText()
result.text.setText(sum + "5")
}
}
else if (e.getSource() == number_key.six)
{
if (com || i == 0)
{
result.text.setText("6")
com = false
i = 1
}
else
{
sum = result.text.getText()
result.text.setText(sum + "6")
}
}
else if (e.getSource() == number_key.seven)
{
if (com || i == 0)
{
result.text.setText("7")
com = false
i = 1
}
else
{
sum = result.text.getText()
result.text.setText(sum + "7")
}
}
else if (e.getSource() == number_key.eight)
{
if (com || i == 0)
{
result.text.setText("8")
com = false
i = 1
}
else
{
sum = result.text.getText()
result.text.setText(sum + "8")
}
}
else if (e.getSource() == number_key.nine)
{
if (com || i == 0)
{
result.text.setText("9")
com = false
i = 1
}
else
{
sum = result.text.getText()
result.text.setText(sum + "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)
{
if (com || i == 0)
{
result.text.setText("0")
com = false
i = 1
}
else
{
sum = result.text.getText()
if (Float.parseFloat(sum) >0 || Float.parseFloat(sum) <0)
{
result.text.setText(sum + "0")
}
else
{
if (sum.trim().indexOf(".") == -1)
{
result.text.setText(sum)
}
else
{
result.text.setText(sum + "0")
}
}
}
}
else if (e.getSource() == number_key.ce)
{
result.text.setText("0")
i = 0
com = true
}
else if (e.getSource() == number_key.tzero)
{
if (com || i == 0)
{
result.text.setText("0")
com = false
i = 1
}
else
{
sum = result.text.getText()
if (Float.parseFloat(sum) >0 || Float.parseFloat(sum) <0)
{
result.text.setText(sum + "00")
}
else
{
if (sum.trim().indexOf(".") == -1)
{
result.text.setText(sum)
}
else
{
result.text.setText(sum + "00")
}
}
}
}
/*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
{
sum = result.text.getText()
if (sum.trim().indexOf(".") == -1)
{
result.text.setText(sum + ".")
}
else
{
result.text.setText(sum)
}
}
}
//获得点击+之前的数值
else if (e.getSource() == number_key.plus)
{
com = true
i = 0
total = 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
total = 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
total = Double.parseDouble(result.text.getText())
System.out.println(total)
symbol = 3
}//获得点击/之前的数值
else if (e.getSource() == number_key.div)
{
com = true
i = 0
total = Double.parseDouble(result.text.getText())
symbol = 4
}
else if (e.getSource() == number_key.equal)
{
switch (symbol)
{
case 1 ://计算加法
{
double ad =
total + Double.parseDouble(result.text.getText())
result.text.setText(ad + "")
i = 0
sum = ""
break
}
case 2 ://计算减法
{
double ad =
total - Double.parseDouble(result.text.getText())
result.text.setText(String.valueOf(ad))
i = 0
sum = ""
break
}
case 3 ://计算乘法
{
double ad =
total * Double.parseDouble(result.text.getText())
result.text.setText(ad + "")
i = 0
sum = ""
break
}
case 4 ://计算除法
{
double ad =
total / Double.parseDouble(result.text.getText())
result.text.setText(ad + "")
i = 0
sum = ""
break
}
}
System.out.println(com)
}
}
public static void main(String[] args)
{
sakura ww = new sakura()
ww.setVisible(true)
}
}