具体代码如下：
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=0i<allButtons.lengthi++){
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=0i<16i++){
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=0i<allButtons.lengthi++){
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=0i<16i++){
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()
}
}
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
package Testimport java.awt.*
import java.awt.event.*
import java.util.*
import javax.swing.*
public class Calculator extends JFrame{
private float op1,op2//定义两个变量存放需要运算的值
private String str=""//定义str去和text进行交叉赋值
private String opr,co//opr存放符合，co用来存放复制的内容
private double re//用来存放运算的结果
private boolean bo=false//是否进行了+-*/运算
private boolean btime=false//时间开关
Container contentpane=this.getContentPane()
JPanel panel1=new JPanel(new BorderLayout()),
panel2=new JPanel(new FlowLayout()),
panel3=new JPanel(new GridLayout(4,5)),
panel4=new JPanel(new BorderLayout()),
panel5=new JPanel(new BorderLayout())
//菜单栏
JMenuBar menubar=new JMenuBar()
JMenu edit=new JMenu("编辑(E)"),
find=new JMenu("查看(V)"),
help=new JMenu("帮助(H)")
JMenuItem copy=new JMenuItem("复制(C)",'C'),
paste=new JMenuItem("粘贴(P)",'P'),
standard=new JMenuItem("标准型(T)",'T'),
science=new JMenuItem("科学型(S)",'S'),
numarray=new JMenuItem("数字分组(I)",'I'),
helptopic=new JMenuItem("帮助主题(H)",'H'),
aboutcal=new JMenuItem("关于计算器(A)",'A')
//输入文本框
JTextField text=new JTextField(25)
//数字键
JButton one=new JButton("1"),
two=new JButton("2"),
three=new JButton("3"),
four=new JButton("4"),
five=new JButton("5"),
six=new JButton("6"),
seven=new JButton("7"),
eight=new JButton("8"),
nine=new JButton("9"),
zero=new JButton("0")
//功能键
JButton division=new JButton("/"),
multiply=new JButton("*"),
addition=new JButton("+"),
subtration=new JButton("-"),
sqrt=new JButton("sqrt"),
residual=new JButton("%"),
sign=new JButton("+/-"),
dot=new JButton("."),
reciprocal=new JButton("1/X"),
amount=new JButton("="),
backspace=new JButton("Backspace"),
ce=new JButton("CE"),
c=new JButton("C"),
time=new JButton("time")
public Calculator() {
contentpane.setLayout(new BorderLayout())
//textField文本从右边开始写
text.setHorizontalAlignment(SwingConstants.RIGHT)
text.setText("0.")
//菜单栏添加
edit.add(copy)
edit.add(paste)
find.add(standard)
find.add(science)
find.addSeparator()
find.add(numarray)
help.add(helptopic)
help.addSeparator()
help.add(aboutcal)
//把组件添加至容器中
menubar.add(edit)
menubar.add(find)
menubar.add(help)
panel1.add(menubar,"North")
panel1.add(text,"West")
//添加数字、功能键至panel2、panel3
panel2.add(backspace)
panel2.add(ce)
panel2.add(c)
panel2.add(time)
panel3.add(seven)
panel3.add(eight)
panel3.add(nine)
panel3.add(division)
panel3.add(sqrt)
panel3.add(four)
panel3.add(five)
panel3.add(six)
panel3.add(multiply)
panel3.add(residual)
panel3.add(one)
panel3.add(two)
panel3.add(three)
panel3.add(subtration)
panel3.add(reciprocal)
panel3.add(zero)
panel3.add(sign)
panel3.add(dot)
panel3.add(addition)
panel3.add(amount)
panel4.add(panel2,"North")
panel4.add(panel3,"West")
panel5.add(panel1,"North")
panel5.add(panel4,"West")
contentpane.add(panel5,"North")
//事件
//助记符
edit.setMnemonic('E')
find.setMnemonic('V')
help.setMnemonic('H')
//快捷键
KeyStroke kcopy=KeyStroke.getKeyStroke(KeyEvent.VK_C,Event.CTRL_MASK)
copy.setAccelerator(kcopy)
KeyStroke kpaste=KeyStroke.getKeyStroke(KeyEvent.VK_V,Event.CTRL_MASK)
paste.setAccelerator(kpaste)
//0-9、.的显示事件
actionlistener1 al1=new actionlistener1()
one.addActionListener(al1)
two.addActionListener(al1)
three.addActionListener(al1)
four.addActionListener(al1)
five.addActionListener(al1)
six.addActionListener(al1)
seven.addActionListener(al1)
eight.addActionListener(al1)
nine.addActionListener(al1)
//小数点的ActionListener事件
dot.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e){
int count
count=str.length()
//1.第一位就为.时改变text中内容为："0."
if(count==0){
str="0."
text.setText(str)
}
//2.不可以重复按"."
else {if(!str.contains(".")){
str+="."
text.setText(str)
}
else
System.out.println("您再点的话，输入的将不再是小数了！")
}
}
})
//如果第一位是0那么第二位就不可以为0
zero.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e){
int count
count=str.length()
if(bo){
if(!(str.contains("0")&&count==1)){
str=""
str+="0"
text.setText(str)
}else
System.out.println("您再点的话，输入的将不再是数字了！")
}
else{
if(!(str.contains("0")&&count==1)){
str+="0"
text.setText(str)
}else
System.out.println("您再点的话，输入的将不再是数字了！")
}
bo=false
}
})
//+、-、*、/、%运算
actionlistener3 al3=new actionlistener3()
addition.addActionListener(al3)
subtration.addActionListener(al3)
multiply.addActionListener(al3)
division.addActionListener(al3)
residual.addActionListener(al3)
//CE和C清空按钮时间
actionlistener2 al2=new actionlistener2()
ce.addActionListener(al2)
c.addActionListener(al2)
//退格键
backspace.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e){
int count
count=str.length()-1
if(bo==false){
if(count>=0){
str=str.substring(0,count)
text.setText(str)
}
else
text.setText("0.")
}else
System.out.println("您现在正进行法则运算！")
}
})
//求平方根
sqrt.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e){
int count
count=str.length()
if(count!=0){
op1=Float.parseFloat(text.getText())
re=Math.sqrt(op1)
String str1=String.valueOf(re)
text.setText(str1)
str=""
}
else
System.out.println("您现在的按sqrt键毫无意义")
}
})
//求倒数
reciprocal.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e){
int count
count=str.length()
if(count!=0){
op1=Float.parseFloat(text.getText())
if(op1!=0){
re=1/op1
String str1=String.valueOf(re)
text.setText(str1)
str=str1
}
else{
text.setText("除数不可以为0的")
str=""
}
}
else
System.out.println("您现在的按1/X键毫无意义")
}
})
//=事件
amount.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e){
op2=Float.parseFloat(str)
//需判断进行那种运算法则
if(opr=="+"){//加法运算
re=op1+op2
String str1=String.valueOf(re)
text.setText(str1)
str=String.valueOf(re)
}else{
if(opr=="-"){//减法运算
re=op1-op2
String str1=String.valueOf(re)
text.setText(str1)
str=String.valueOf(re)
}else{
if(opr=="*"){//乘法运算
re=op1*op2
String str1=String.valueOf(re)
text.setText(str1)
str=String.valueOf(re)
}else{
if(opr=="/"&&op2!=0){//除法运算
re=op1/op2
String str1=String.valueOf(re)
text.setText(str1)
str=String.valueOf(re)
}else{
if(opr=="%"){//取余运算
re=op1%op2
String str1=String.valueOf(re)
text.setText(str1)
str=""
}
else if(op2==0){
text.setText("除数不可以为0的")
str=""
}
}
}
}
}
//打印看看
System.out.print(op1)
System.out.print(opr)
System.out.print(op2+"=")
System.out.print(re)
System.out.println()
}
})
//复制事件
copy.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e){
int count
count=str.length()
if(count!=0){
co=text.getText()
}
else
System.out.println("没有可复制的对象")
}
})
//粘贴事件
paste.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e){
str=co
text.setText(str)
}
})
//时间事件
time.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e){
if(btime==false){
String st=(new Date()).toString()
text.setText(st)
str=""
btime=true
}
else{
text.setText(str)
btime=false
}
}
})
//+/-事件
sign.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e){
int a=Integer.valueOf(str)
a=a*(-1)
str=String.valueOf(a)
text.setText(str)
}
})
}
//定义1-9按钮在text中显示的内部类
class actionlistener1 implements ActionListener{
public void actionPerformed(ActionEvent e){
JButton button=(JButton)e.getSource()
String btext=button.getText()
//如果第一位为0再输入其他非零的整数时将零忽略
if(bo){
if(str.indexOf("0")==0&&str.length()==1){
str=""
str+=btext
text.setText(str)
}else{
str=""
str+=btext
text.setText(str)}
}else{
if(str.indexOf("0")==0&&str.length()==1){
str=""
str+=btext
text.setText(str)
}else{
str+=btext
text.setText(str)
}
}
bo=false
}
}
//定义清空text中内容的内部类
class actionlistener2 implements ActionListener{
public void actionPerformed(ActionEvent e){
str=""
text.setText("0.")
}
}
//定义+、-、*、/、%运算的内部类
class actionlistener3 implements ActionListener{
public void actionPerformed(ActionEvent e){
int count
count=str.length()
if(count!=0){
JButton button=(JButton)e.getSource()
opr=button.getText()
op1=Float.parseFloat(str)
bo=true
}
else
System.out.println("您现在的按键毫无意义！")
}
}
public static void main(String[] args){
Calculator cc=new Calculator()
cc.pack()
cc.setResizable(false)//不可最大化
cc.setVisible(true)
cc.setTitle("计算器")
cc.setDefaultCloseOperation(EXIT_ON_CLOSE)
Dimension scmsize=Toolkit.getDefaultToolkit().getScreenSize()
int w=cc.getSize().width
int h=cc.getSize().height
int x=(scmsize.width-w)/2
int y=(scmsize.height-h)/2
cc.setLocation(x, y)
}
}
