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()
}
}
窗体
package Calc
import java.awt.*
import java.awt.event.*
import javax.swing.*
/**
*
* 计算器程序
*
*/
public class CalcFrame extends JFrame {
JButton[] buttons = new JButton[16]// 16个按钮
StringBuffer sb = null//
JTextField text1 = null// 计算器结果显示框
String no1 = null
String sign = null// 表示+-*/符号
String[] s = { "0", "1", "2", "3", "4", "5", "6", "7", "8", "9", "+", "-",
"*", "/", "=", "C" }// 面板上的字符
public CalcFrame() {
setTitle("计算器")
setResizable(false)
setBounds(200, 200, 300, 350)
setLayout(null)
sb = new StringBuffer()
text1 = new JTextField()
text1.setBounds(10, 10, 250, 30)// 设置位置
text1.setFont(new Font("Arial", Font.PLAIN, 20))// 设置字体
text1.setForeground(Color.RED)// 设置颜色
add(text1)
for (int i = 0i <s.lengthi++) {
buttons[i] = new JButton(s[i])
buttons[i].setFont(new Font("Serif", Font.BOLD, 18))
add(buttons[i])
}// 生成面板上的按钮.
buttons[0].setBounds(10, 50, 50, 40)
buttons[0].addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
sb.append(0)
text1.setText(sb.toString())
}
})
buttons[1].setBounds(70, 50, 50, 40)
buttons[1].addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
sb.append(1)
text1.setText(sb.toString())
}
})
buttons[2].setBounds(130, 50, 50, 40)
buttons[2].addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
sb.append(2)
text1.setText(sb.toString())
}
})
buttons[3].setBounds(190, 50, 50, 40)
buttons[3].addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
sb.append(3)
text1.setText(sb.toString())
}
})
buttons[4].setBounds(10, 100, 50, 40)
buttons[4].addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
sb.append(4)
text1.setText(sb.toString())
}
})
buttons[5].setBounds(70, 100, 50, 40)
buttons[5].addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
sb.append(5)
text1.setText(sb.toString())
}
})
buttons[6].setBounds(130, 100, 50, 40)
buttons[6].addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
sb.append(6)
text1.setText(sb.toString())
}
})
buttons[7].setBounds(190, 100, 50, 40)
buttons[7].addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
sb.append(7)
text1.setText(sb.toString())
}
})
buttons[8].setBounds(10, 150, 50, 40)
buttons[8].addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
sb.append(8)
text1.setText(sb.toString())
}
})
buttons[9].setBounds(70, 150, 50, 40)
buttons[9].addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
sb.append(9)
text1.setText(sb.toString())
}
})
buttons[10].setBounds(130, 150, 50, 40)
buttons[10].addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
sign = "+"
no1 = text1.getText()
sb.delete(0, sb.capacity())
}
})
buttons[11].setBounds(190, 150, 50, 40)
buttons[11].addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
sign = "-"
no1 = text1.getText()
sb.delete(0, sb.capacity())
}
})
buttons[12].setBounds(10, 200, 50, 40)
buttons[12].addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
sign = "*"
no1 = text1.getText()
sb.delete(0, sb.capacity())
}
})
buttons[13].setBounds(70, 200, 50, 40)
buttons[13].addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
sign = "/"
no1 = text1.getText()
sb.delete(0, sb.capacity())
}
})
buttons[14].setForeground(Color.RED)
buttons[14].setBounds(130, 200, 50, 40)
buttons[14].addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
int sum = 0//最终结果
if (sign.equals("+")) {
int no2 = Integer.parseInt(no1)//取得前一个数
int no3 = Integer.parseInt(text1.getText())//取得现在的数
sum = no2 + no3//累加
text1.setText(String.valueOf(sum))
}
if (sign.equals("-")) {
int no2 = Integer.parseInt(no1)
int no3 = Integer.parseInt(text1.getText())
sum = no2 - no3
text1.setText(String.valueOf(sum))
}
if (sign.equals("*")) {
int no2 = Integer.parseInt(no1)
int no3 = Integer.parseInt(text1.getText())
sum = no2 * no3
text1.setText(String.valueOf(sum))
}
if (sign.equals("/")) {
int no2 = Integer.parseInt(no1)
int no3 = Integer.parseInt(text1.getText())
sum = no2 / no3
text1.setText(String.valueOf(sum))
}
}
})
buttons[15].setBounds(190, 200, 50, 40)
buttons[15].addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
sb.delete(0, sb.capacity())//清除sb的内容
text1.setText("")//结果框设置为空
}
})
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE)//响应关闭窗口
setVisible(true)//显示窗口
}
}
2.主程序类
package Calc
public class CalcTest {
public static void main(String[] args) {
CalcFrame f = new CalcFrame()
}
}
学习Java就到IT学习联盟
打开IED：打开自己java编程的软件，采用的是eclipse软件。
建立java工程。
编写类。
编写类的详细步骤1.类的基本结构：
由于这里用到了界面，所以要进行窗口界面的编程，按钮事件的处理，和计算处理界面；
package MyCaculator
import java.awt.*
import java.awt.event.*
import javax.swing.*
public class MyCaculator extends JFrame {
private int add=1,sub=2,mul=3,div=4
private int op=0
boolean ifOp
private String output="0"
private Button[] jba=new Button[]{new Button("7"),new Button("8"),
new Button("9"),new Button("+"),
new Button("4"),new Button("5"),new Button("6"),new Button("-"),
new Button("1"),new Button("2"),new Button("3"),new Button("*"),
new Button("0"),new Button("."),new Button("="),new Button("/")}
private JPanel jpt=new JPanel()
private JPanel jpb=new JPanel()
private JTextField jtf=new JTextField("")
private MyCaculator(){
}
private void operate(String x){
}
public String add(String x){
return output
}
public String subtract(String x){
return output
}
public String multiply(String x){
return output
}
public String divide(String x){
return output
}
public String Equals(String x){
return output
}
public void opClean(){
}
class setOperate_Act implements ActionListener{
public void actionPerformed(ActionEvent e) {
}
}
class setLabel_Act implements ActionListener{
public void actionPerformed(ActionEvent e) {
}
}
public static void main(String[] args) {
}
}
2.建立构造方法：
所谓构造方法就是，对自己的主类进行初始化，代码如下：
private MyCaculator(){
jpt.setLayout(new BorderLayout())
jpt.add(jtf)
this.add(jpt,BorderLayout.NORTH)
jpb.setLayout(new GridLayout(4,4))
for(int i=0i<jba.lengthi++){
jpb.add(jba[i])
if(i==3||i==7||i==11||i==15||i==14)
jba[i].addActionListener(new setOperate_Act())
else
jba[i].addActionListener(new setLabel_Act())
}
this.add(jpb,BorderLayout.CENTER)
this.setSize(250, 200)
this.setResizable(false)
this.setVisible(true)
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE)
}
3.建立数据计算方法
这里的数据计算方法有6个，一个是主方法其他几个是加减乘除的处理方法，代码如下：
private void operate(String x){
double x1=Double.valueOf(x)
double y=Double.valueOf(output)
switch(op){
case 0:output=xbreak
case 1:output=String.valueOf(y+x1)break
case 2:output =String.valueOf(y-x1)break
case 3:output =String.valueOf(y*x1)break
case 4:
if(x1!=0) output=String.valueOf(y/x1)
else output="不能为0"
break
}
}
public String add(String x){
operate(x)
op=add
return output
}
public String subtract(String x){
operate(x)
op=sub
return output
}
public String multiply(String x){
operate(x)
op=mul
return output
}
public String divide(String x){
operate(x)
op=div
return output
}
public String Equals(String x){
operate(x)
op=0
return output
}
public void opClean(){
op=0
output ="0"
}
4.事件处理方法
这里的时间处理方法，没有建立一个整体的方法，二是在为了便于处理的方法，将按钮事件分成两个部分，并采用两个子类来实现，这两个类时内部类要写在主类内部的，代码如下：
class setOperate_Act implements ActionListener{
public void actionPerformed(ActionEvent e) {
if(e.getSource()==jba[3]){
jtf.setText(add(jtf.getText()))
ifOp=true
}
else if(e.getSource()==jba[7]){
jtf.setText(subtract(jtf.getText()))
ifOp=true
}
else if(e.getSource()==jba[11]){
jtf.setText(multiply(jtf.getText()))
ifOp=true
}
else if(e.getSource()==jba[15]){
jtf.setText(divide(jtf.getText()))
ifOp=true
}
else if(e.getSource()==jba[14]){
jtf.setText(Equals(jtf.getText()))
ifOp=true
}
}
}
class setLabel_Act implements ActionListener{
public void actionPerformed(ActionEvent e) {
Button tempb=(Button)e.getSource()
if(ifOp){
jtf.setText(tempb.getLabel())
ifOp=false
}else {
jtf.setText(jtf.getText()+tempb.getLabel())
}
}
}
5.建立main方法：
要想实现我们的代码，我们需在main方法中，实例化我们的对象。
public static void main(String[] args) {
new MyCaculator()
}
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