要用java编的计算器代码

给你一个比较简单的吧。以前写的。

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共两个类。还只是完成＋、－、×、÷运算而已。

GUI只是用了AWT，很简单，相信一看就能懂了。

Calculator.java

public class Calculator{

private String result = "0";

private int op = 0,add = 1,sub = 2,mul = 3,div = 4;

private double stringToDouble(String x){

double y = Double.parseDouble(x);

return y;

}

private void operate(String x){

double x1 = stringToDouble(x);

double y = stringToDouble(result);

switch (op){

case 0:

result = x;

break;

case 1:

result = String.valueOf(y+x1);

break;

case 2:

result = String.valueOf(y-x1);

break;

case 3:

result = String.valueOf(y*x1);

break;

case 4:

if(x1!=0){

result = String.valueOf(y/x1);

}else{

result = "The divisor can't be zero!";

}

break;

}

}

public String opAdd(String x){

operate(x);

op = add;

return result;

}

public String opSubtract(String x){

operate(x);

op = sub;

return result;

}

public String opMultiply(String x){

operate(x);

op = mul;

return result;

}

public String opDivide(String x){

operate(x);

op = div;

return result;

}

public String opEquals(String x){

operate(x);

op = 0;

return result;

}

public void opClean(){

op = 0;

result = "0";

}

}

CalculatorGUI.java

import java.awt.*;

import java.awt.event.*;

import java.util.EventObject;

public class CalculatorGUI{

private Frame f;

private Panel p1,p2;

private Button b0,b1,b2,b3,b4,b5,b6,b7,b8,b9;

private Button bPoint,bAdd,bDec,bMul,bDiv,bCal;

private TextField tf;

private String s,op;

private Calculator cal = new Calculator();

private boolean ifOp;

public CalculatorGUI(){

f = new Frame("Calculator");

p1 = new Panel();

p2 = new Panel();

b0 = new Button("0");

b1 = new Button("1");

b2 = new Button("2");

b3 = new Button("3");

b4 = new Button("4");

b5 = new Button("5");

b6 = new Button("6");

b7 = new Button("7");

b8 = new Button("8");

b9 = new Button("9");

bPoint = new Button(".");

bAdd = new Button("+");

bDec = new Button("-");

bMul = new Button("*");

bDiv = new Button("/");

bCal = new Button("=");

tf = new TextField(25);

tf.setEditable(false);

}

public void launchFrame(){

f.setSize(220,160);

f.setResizable(false);

f.addWindowListener(new myWindowListener());

p1.setLayout(new FlowLayout(FlowLayout.CENTER));

p1.add(tf);

f.add(p1,BorderLayout.NORTH);

p2.setLayout(new GridLayout(4,4));

b0.addActionListener(new setLabelText_ActionListener());

b1.addActionListener(new setLabelText_ActionListener());

b2.addActionListener(new setLabelText_ActionListener());

b3.addActionListener(new setLabelText_ActionListener());

b4.addActionListener(new setLabelText_ActionListener());

b5.addActionListener(new setLabelText_ActionListener());

b6.addActionListener(new setLabelText_ActionListener());

b7.addActionListener(new setLabelText_ActionListener());

b8.addActionListener(new setLabelText_ActionListener());

b9.addActionListener(new setLabelText_ActionListener());

bPoint.addActionListener(new setLabelText_ActionListener());

bAdd.addActionListener(new setOperator_ActionListener());

bDec.addActionListener(new setOperator_ActionListener());

bMul.addActionListener(new setOperator_ActionListener());

bDiv.addActionListener(new setOperator_ActionListener());

bCal.addActionListener(new setOperator_ActionListener());

p2.add(b7);

p2.add(b8);

p2.add(b9);

p2.add(bAdd);

p2.add(b4);

p2.add(b5);

p2.add(b6);

p2.add(bDec);

p2.add(b1);

p2.add(b2);

p2.add(b3);

p2.add(bMul);

p2.add(b0);

p2.add(bPoint);

p2.add(bCal);

p2.add(bDiv);

f.add(p2,BorderLayout.SOUTH);

f.setVisible(true);

}

public void setTextFieldText_Temp(){

if (tf.getText().length()15 (tf.getText().indexOf(".")==-1 || !s.equals("."))){

tf.setText(tf.getText()+s);

}else{

tf.setText((tf.getText()+s).substring(0,15));

}

}

public void setTextFieldText(){

if(ifOp){

ifOp = false;

tf.setText("");

setTextFieldText_Temp();

}else{

setTextFieldText_Temp();

}

}

public static void main(String[] args){

CalculatorGUI calculator = new CalculatorGUI();

calculator.launchFrame();

}

class myWindowListener extends WindowAdapter{

public void windowClosing(WindowEvent e){

System.exit(0);

}

}

class setLabelText_ActionListener implements ActionListener{

public void actionPerformed(ActionEvent e){

Button tempB = (Button)e.getSource();

s = tempB.getLabel();

setTextFieldText();

}

}

class setOperator_ActionListener implements ActionListener{

public void actionPerformed(ActionEvent e){

Button tempB = (Button)e.getSource();

op = tempB.getLabel();

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

tf.setText(cal.opAdd(tf.getText()));

ifOp = true;

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

tf.setText(cal.opSubtract(tf.getText()));

ifOp = true;

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

tf.setText(cal.opMultiply(tf.getText()));

ifOp = true;

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

tf.setText(cal.opDivide(tf.getText()));

ifOp = true;

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

tf.setText(cal.opEquals(tf.getText()));

ifOp = true;

}

}

}

}

求解：写一段Java程序，要求简单实现计算器的功能，是GUI编程，代码简洁最好。

import java.awt.BorderLayout;

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;

//暂时不用考虑连加问题

//点第一个运算符 点运算符 点第二个运算符 点=出结果

public class 计算器 implements ActionListener {

JTextField jtf = new JTextField(10);

private boolean append = false;

private String op1 = "0";

private String operator = "+";

@Override

public void actionPerformed(ActionEvent e) {

String comn = e.getActionCommand();

// 处理数字

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

if (append) {// 追加

String temp = jtf.getText();

jtf.setText(temp + comn);

} else {// 替换

jtf.setText(comn);

append = true;

}

}

// 处理运算符

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

op1 = jtf.getText();

operator = comn;

append = false;

} else if ("=".indexOf(comn) != -1) {

String op2 = jtf.getText();

double d1 = Double.parseDouble(op1);

double d2 = Double.parseDouble(op2);

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

d1 = d1 + d2;

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

d1 = d1 - d2;

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

d1 = d1 * d2;

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

d1 = d1 / d2;

}

jtf.setText(d1 + "");

append = false;

} else if (".".equals(comn)) {

String temp = jtf.getText();

if (temp.indexOf(".") == -1) {

jtf.setText(temp + ".");

append = true;

}

} else if ("+/-".equals(comn)) {

String temp = jtf.getText();

if (temp.startsWith("-1")) {

jtf.setText(temp.substring(1));

} else {

jtf.setText("-" + temp);

}

} else if ("Backspace".equals(comn)) {

String temp = jtf.getText();

if (temp.length() 0) {

jtf.setText(temp.substring(0, temp.length() - 1));

}

} else if ("CE".equals(comn) || "C".equals(comn)) {

jtf.setText("0");

append = false;

}

}

public 计算器() {

JFrame jf = new JFrame("计算器");

jf.add(jtf, BorderLayout.NORTH);

String[] s1 = { "Backspace", "CE", "C", "+", "7", "8", "9", "/", "4",

"5", "6", "*", "1", "2", "3", "-", "0", "+/-", ".", "=" };

JPanel jp = new JPanel();

jf.add(jp, BorderLayout.CENTER);

GridLayout gl = new GridLayout(5, 4);

jp.setLayout(gl);

JButton[] jb = new JButton[s1.length];

for (int i = 0; i s1.length; i++) {

jb[i] = new JButton(s1[i]);

jp.add(jb[i]);

jb[i].addActionListener(this);

}

jf.add(jp);

jtf.setEditable(false);

jf.setLocation(400, 300);

jf.pack();

jf.setResizable(false);// 设置窗口的大小不可变

jf.setDefaultCloseOperation(jf.EXIT_ON_CLOSE);

jf.setVisible(true);

}

public static void main(String[] args) {

new 计算器();

}

}

这个功能比较简单 不知道能不能满足要求

有关java里面gui的编程题，实现这样一个建议的计算器

import javax.swing.*;

import javax.swing.JTextField;

import java.awt.*;

import java.awt.event.*;

import java.lang.*;

import java.awt.Color;

public class Ex5_2 extends JFrame implements ActionListener

{

private JPanel p1 = new JPanel(); //创建面板

private JPanel p2 = new JPanel();

private JTextField t1; //文本框1用来显示输入信息

private JTextField t2; //文本框2用来显示结果信息

private JLabel label; //标签信息

StringBuffer str; //显示屏所显示的字符串

double x,y; //x和y都是运算数

int z; //Z表示单击了那一个运算符.0表示"+",1表示"-",2表示"*",3表示"/"

private JButton b[] = new JButton[12]; //创建一个有12个按钮的数组

private JButton b1,b2,b3,b4,b5,b6,b7,b8; //算术功能按钮

public Ex5_2()

{

super("简易计算器"); //窗口名称

Container c = getContentPane(); //创建内容面板对象

t1 = new JTextField(30);

t1.setEditable(false); //只能显示，不能编辑

t2 = new JTextField(30);

t2.setEditable(false); //只能显示，不能编辑

label = new JLabel("欢迎使用小巫版计算器^_^o~ 努力！");

label.setForeground(Color.blue);

//创建一个空字符串缓冲区

str=new StringBuffer();

p2.add(label); //添加标签到面板

p2.add(t2); //添加文本框到面板

p2.add(t1); //添加文本框到面板

p2.setLayout(new GridLayout(4,1)); //把面扳布局为4行1列

for(int i=0;i10;i++) //分别为数组中0~9号的按钮设置标签，并注册监听器

{

String s=""+i;

b[i]= new JButton(s);

b[i].addActionListener(this);

}

//实例化各个按钮

b[10]= new JButton("-/+"); b[11]= new JButton(".");

b1= new JButton("/"); b2= new JButton("Back");

b3= new JButton("*"); b4= new JButton("C");

b5= new JButton("+"); b6= new JButton("Sqrt");

b7= new JButton("-"); b8= new JButton("=");

//设置按钮前景色

for(int i=0;i12;i++)

{

b[i].setForeground(Color.blue);

}

b1.setForeground(Color.red); b3.setForeground(Color.red);

b5.setForeground(Color.red); b7.setForeground(Color.red);

b2.setForeground(Color.blue); b4.setForeground(Color.blue);

b6.setForeground(Color.red); b8.setForeground(Color.blue);

//添加到面板

p1.add(b[7]); p1.add(b[8]); p1.add(b[9]); p1.add(b1); p1.add(b2);

p1.add(b[4]); p1.add(b[5]); p1.add(b[6]); p1.add(b3); p1.add(b4);

p1.add(b[1]); p1.add(b[2]); p1.add(b[3]); p1.add(b5); p1.add(b6);

p1.add(b[0]); p1.add(b[10]); p1.add(b[11]);p1.add(b7);p1.add(b8);

p1.setLayout(new GridLayout(4,5,5,5));

//注册监听器

b[10].addActionListener(this); b[11].addActionListener(this);

b1.addActionListener(this); b2.addActionListener(this);

b3.addActionListener(this); b4.addActionListener(this);

b5.addActionListener(this); b6.addActionListener(this);

b7.addActionListener(this); b8.addActionListener(this);

//将面板添加到内容面板

c.add(p2);

c.add(p1);

c.setLayout(new FlowLayout()); //设置为顺序布局

setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); //设置窗口关闭动作

setVisible(true); //设置为可见

setResizable(false); //禁止调整框架大小

setSize(400,300); //设置窗口大小

}

//主方法实现创建一个窗口

public static void main(String[] args)

{ Ex5_2 f = new Ex5_2(); }

//按钮的事件处理

public void actionPerformed(ActionEvent e)

{

try

{

if(e.getSource()==b4) //选择"C"清零

{

t1.setText("0"); //把文本框清零

t1.setHorizontalAlignment(JTextField.RIGHT); //文本对齐右边

str.setLength(0); //清空字符串缓冲区以准备接收新的输入运算数

}

else if(e.getSource()==b[10])//单击"+/-"选择输入的运算数是正数还是负数

{

x=Double.parseDouble(t1.getText().trim());//trim函数作用是去掉字符串中的空格

t1.setText(""+(-x));

t1.setHorizontalAlignment(JTextField.RIGHT);

}

else if (e.getSource()==b5)//单击加号按钮获得x的值和z的值并清空y的值

{

x=Double.parseDouble(t1.getText().trim());

str.setLength(0);

y=0d;

z=0;

}

else if(e.getSource()==b7)//单击减号按钮获得x的值和z的值并清空y的值

{

x=Double.parseDouble(t1.getText().trim());

str.setLength(0);

y=0d;

z=1;

}

else if(e.getSource()==b3)//单击乘号按钮获得x的值和z的值并清空y的值

{

x=Double.parseDouble(t1.getText().trim());

str.setLength(0);

y=0d;

z=2;

}

else if(e.getSource()==b1)//单击除号按钮获得x的值和z的值并清空y的值

{

x=Double.parseDouble(t1.getText().trim());

str.setLength(0);

y=0d;

z=3;

}

else if(e.getSource()==b8)//单击等号按钮输出计算结果

{

str.setLength(0);

switch(z)

{

case 0: t1.setText(""+(x+y)); t1.setHorizontalAlignment(JTextField.RIGHT);break;

case 1: t1.setText(""+(x-y)); t1.setHorizontalAlignment(JTextField.RIGHT);break;

case 2: t1.setText(""+(x*y)); t1.setHorizontalAlignment(JTextField.RIGHT);break;

case 3: t1.setText(""+(x/y)); t1.setHorizontalAlignment(JTextField.RIGHT);break;

}

}

else if(e.getSource()==b[11])//单击"."按钮输入小数

{

if(t1.getText().trim().indexOf('.')!=-1)//判断字符串中是否已经包含了小数点

{

}

else //如果没有小数点

{

if(t1.getText().trim().equals("0"))//如果初时显示为0

{

t1.setText(str.append(e.getActionCommand()).toString());

t1.setHorizontalAlignment(JTextField.RIGHT);

}

else if(t1.getText().trim().equals(""))//如果初时显示为空则不做任何操作

{}

else

{

t1.setText(str.append(e.getActionCommand()).toString());

t1.setHorizontalAlignment(JTextField.RIGHT);

}

}

y=0d;

}

else if(e.getSource()==b6) //求平方根

{

x=Double.parseDouble(t1.getText().trim());

if(x0)

{

t1.setText("数字格式异常");

t1.setHorizontalAlignment(JTextField.RIGHT);

}

else

{

t1.setText(""+Math.sqrt(x));

t1.setHorizontalAlignment(JTextField.RIGHT);

}

str.setLength(0);

y=0d;

}

else

{

if(e.getSource()==b[0])//如果选择的是"0"这个数字键

{

if(t1.getText().trim().equals("0"))//如果显示屏显示的为零不做操作

{}

else

t1.setText(str.append(e.getActionCommand()).toString());

t1.setHorizontalAlignment(JTextField.RIGHT);

y=Double.parseDouble(t1.getText().trim());

}

else if (e.getSource()==b2) //选择的是back键

{

if(!t1.getText().trim().equals("0"))//如果显示屏显示的不是零

{

if(str.length()!=1)

{

t1.setText(str.delete(str.length()-1,str.length()).toString());//可能抛出字符串越界异常

t1.setHorizontalAlignment(JTextField.RIGHT);

}

else

{

t1.setText("0"); t1.setHorizontalAlignment(JTextField.RIGHT);

str.setLength(0);

}

}

y=Double.parseDouble(t1.getText().trim());

}

else

{

t1.setText(str.append(e.getActionCommand()).toString());

t1.setHorizontalAlignment(JTextField.RIGHT);

y=Double.parseDouble(t1.getText().trim());

}

}

}

catch(NumberFormatException e1){ t1.setText("数字格式异常");

t1.setHorizontalAlignment(JTextField.RIGHT); }

catch(StringIndexOutOfBoundsException e1){t1.setText("字符串索引越界");

t1.setHorizontalAlignment(JTextField.RIGHT);}

}

}

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