java计算机全部代码,Java计算机代码

关于java中计算机的功能实现代码求大神指导

import java.util.Scanner;

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import java.awt.*;

import java.awt.event.*;

public class Test extends WindowAdapter {

Panel p1 = new Panel();

Panel p2 = new Panel();

Panel p3 = new Panel();

TextField txt;

private Button[] b = new Button[17];

private String ss[] = { "7", "8", "9", "+", "4", "5", "6", "-", "1", "2",

"3", "*", "clear", "0", "=", "/", "close" };

static double a;

static String s, str;// 定义变量创建对像

public static void main(String args[]) {

(new Test()).frame();

}

public void frame() {

Frame fm = new Frame("简单计算器");

for (int i = 0; i = 16; i++) {

b[i] = new Button(ss[i]);

}

for (int i = 0; i = 15; i++) {

p2.add(b[i]);

} // 创建按钮并添加到P2

b[16].setBackground(Color.yellow);

txt = new TextField(15);

txt.setEditable(false);

for (int i = 0; i = 16; i++) {

b[i].addActionListener(new buttonlistener());// 添加监听器

}

b[16].addActionListener(new close());

fm.addWindowListener(this);

fm.setBackground(Color.red);

p1.setLayout(new BorderLayout());

p1.add(txt, "North");

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

p3.setLayout(new BorderLayout());

p3.add(b[16]);

fm.add(p1, "North");

fm.add(p2, "Center");

fm.add(p3, "South");

fm.pack();

fm.setVisible(true);// 都是些窗中设置添加相关组件和监听器

}

public void windowClosing(WindowEvent e) {

System.exit(0);// 退出系统

}

class buttonlistener implements ActionListener {// 编写监听器事件通过按键得出给果

public void actionPerformed(ActionEvent e) {

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

if (btn.getLabel() == "=") {

jisuan();

str = String.valueOf(a);

txt.setText(str);

s = "";

} else if (btn.getLabel() == "+") {

jisuan();

txt.setText("");

s = "+";

} else if (btn.getLabel() == "-") {

jisuan();

txt.setText("");

s = "-";

} else if (btn.getLabel() == "/") {

jisuan();

txt.setText("");

s = "/";

} else if (btn.getLabel() == "*") {

jisuan();

txt.setText("");

s = "*";

} else {

txt.setText(txt.getText() + btn.getLabel());

if (btn.getLabel() == "clear")

txt.setText("");

}

public void jisuan() {// 编写具体计算方法

if (s == "+")

a += Double.parseDouble(txt.getText());

else if (s == "-")

a -= Double.parseDouble(txt.getText());

else if (s == "*")

a *= Double.parseDouble(txt.getText());

else if (s == "/")

a /= Double.parseDouble(txt.getText());

else

a = Double.parseDouble(txt.getText());

}

class close implements ActionListener {// 退出

public void actionPerformed(ActionEvent e) {

System.exit(0);

}

用java.EE编写计算器程序代码

java EE是java企业级开发平台的意思，实在是看不出跟计算器这种小程序有什么关联。不知道楼主要找的是不是这个。

package ex1;

import java.awt.BorderLayout;

import java.awt.Color;

import java.awt.Dimension;

import java.awt.Font;

import java.awt.GridLayout;

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

import java.text.DecimalFormat;

import javax.swing.BorderFactory;

import javax.swing.ButtonGroup;

import javax.swing.JButton;

import javax.swing.JCheckBoxMenuItem;

import javax.swing.JFrame;

import javax.swing.JMenu;

import javax.swing.JMenuBar;

import javax.swing.JMenuItem;

import javax.swing.JPanel;

import javax.swing.JRadioButtonMenuItem;

import javax.swing.JTextField;

public class Calcutor extends JFrame {

private JTextField tf;

private JPanel panel1, panel2, panel3, panel4;

private JMenuBar myBar;

private JMenu menu1, menu2, menu3;

private JMenuItem editItem1, editItem2, help1, help2, help3;

private JRadioButtonMenuItem seeItem1, seeItem2;//单选框

private JCheckBoxMenuItem seeItem3;//复选框

private ButtonGroup bgb;

private String back;

private boolean IfResult = true, flag = false;

private String oper = "=";

private double result = 0;

private Num numActionListener;

private DecimalFormat df;

public Calcutor(){

super("科学计算器");//设置标题栏

df = new DecimalFormat("#.####");//保留四位小数

this.setLayout(new BorderLayout(10, 5));

panel1 = new JPanel(new GridLayout(1, 3, 10, 10));

panel2 = new JPanel(new GridLayout(5, 6, 5, 5));//5行6列

panel3 = new JPanel(new GridLayout(5, 1, 5, 5));

panel4 = new JPanel(new BorderLayout(5, 5));

/**

* 菜单栏

myBar = new JMenuBar();

menu1 = new JMenu("编辑(E)");

menu2 = new JMenu("查看(V)");

menu3 = new JMenu("帮助(H)");

menu1.setFont(new Font("宋体", Font.PLAIN, 12));

menu2.setFont(new Font("宋体", Font.PLAIN, 12));

menu3.setFont(new Font("宋体", Font.PLAIN, 12));

/**

* 编辑栏

editItem1 = new JMenuItem("复制(C) Ctrl+C");

editItem2 = new JMenuItem("粘贴(P) Ctrl+V");

editItem1.setFont(new Font("宋体",Font.PLAIN,12));

editItem2.setFont(new Font("宋体",Font.PLAIN,12));

/**

* 查看栏

seeItem1 = new JRadioButtonMenuItem("科学型(T)");

seeItem2 = new JRadioButtonMenuItem("标准型(S)");

seeItem3 = new JCheckBoxMenuItem("数字分组(I)");

seeItem1.setFont(new Font("宋体",Font.PLAIN,12));

seeItem2.setFont(new Font("宋体",Font.PLAIN,12));

seeItem3.setFont(new Font("宋体",Font.PLAIN,12));

/**

* 帮助栏

help1 = new JMenuItem("帮助主题(H)");

help2 = new JMenuItem("关于计算器(A)");

help1.setFont(new Font("宋体",Font.PLAIN,12));

help2.setFont(new Font("宋体",Font.PLAIN,12));

bgb = new ButtonGroup();//选项组

menu1.add(editItem1);

menu1.add(editItem2);

menu2.add(seeItem1);

menu2.add(seeItem2);

menu2.addSeparator();//添加一条分割线

menu2.add(seeItem3);

menu3.add(help1);

menu3.addSeparator();//添加一条分割线

menu3.add(help2);

myBar.add(menu1);

myBar.add(menu2);

myBar.add(menu3);

this.setJMenuBar(myBar);

numActionListener = new Num();//实现数字监听

/**

* 文本域，即为计算器的屏幕显示区域

tf = new JTextField();

tf.setEditable(false);//文本区域不可编辑

tf.setBackground(Color.white);//文本区域的背景色

tf.setHorizontalAlignment(JTextField.RIGHT);//文字右对齐

tf.setText("0");

tf.setBorder(BorderFactory.createLoweredBevelBorder());

init();//对计算器进行初始化

}

/**

* 初始化操作

* 添加按钮

private void init(){

addButton(panel1, "Backspace", new Clear(), Color.red);

addButton(panel1, "CE", new Clear(), Color.red);

addButton(panel1, "C", new Clear(), Color.red);

addButton(panel2, "1/x", new Signs(), Color.magenta);

addButton(panel2, "log", new Signs(), Color.magenta);

addButton(panel2, "7", numActionListener, Color.blue);

addButton(panel2, "8", numActionListener, Color.blue);

addButton(panel2, "9", numActionListener, Color.blue);

addButton(panel2, "÷", new Signs(), Color.red);

addButton(panel2, "n!", new Signs(), Color.magenta);

addButton(panel2, "sqrt", new Signs(), Color.magenta);

addButton(panel2, "4", numActionListener, Color.blue);

addButton(panel2, "5", numActionListener, Color.blue);

addButton(panel2, "6", numActionListener, Color.blue);

addButton(panel2, "×", new Signs(), Color.red);

addButton(panel2, "sin", new Signs(), Color.magenta);

addButton(panel2, "x^2", new Signs(), Color.magenta);

addButton(panel2, "1", numActionListener, Color.blue);

addButton(panel2, "2", numActionListener, Color.blue);

addButton(panel2, "3", numActionListener, Color.blue);

addButton(panel2, "-", new Signs(), Color.red);

addButton(panel2, "cos", new Signs(), Color.magenta);

addButton(panel2, "x^3", new Signs(), Color.magenta);

addButton(panel2, "0", numActionListener, Color.blue);

addButton(panel2, "-/+", new Clear(), Color.blue);

addButton(panel2, ".", new Dot(), Color.blue);

addButton(panel2, "+", new Signs(), Color.red);

addButton(panel2, "tan", new Signs(), Color.magenta);

addButton(panel2, "%", new Signs(), Color.magenta);

addButton(panel2, "π", numActionListener, Color.orange);

addButton(panel2, "e", numActionListener, Color.orange);

addButton(panel2, "′″", new Signs(), Color.orange);

addButton(panel2, "=", new Signs(), Color.red);

JButton btns = new JButton("计算器");

btns.setBorder(BorderFactory.createLoweredBevelBorder());

btns.setEnabled(false);//按钮不可操作

btns.setPreferredSize(new Dimension(20, 20));

panel3.add(btns);//加入按钮

addButton(panel3, "MC", null, Color.red);

addButton(panel3, "MR", null, Color.red);

addButton(panel3, "MS", null, Color.red);

addButton(panel3, "M+", null, Color.red);

panel4.add(panel1, BorderLayout.NORTH);

panel4.add(panel2, BorderLayout.CENTER);

this.add(tf, BorderLayout.NORTH);

this.add(panel3, BorderLayout.WEST);

this.add(panel4);

pack();

this.setResizable(false);//窗口不可改变大小

this.setLocation(300, 200);

this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

}

/**

* 统一设置按钮的的使用方式

* @param panel

* @param name

* @param action

* @param color

private void addButton(JPanel panel, String name, ActionListener action, Color color){

JButton bt = new JButton(name);

panel.add(bt);//在面板上增加按钮

bt.setForeground(color);//设置前景（字体）颜色

bt.addActionListener(action);//增加监听事件

}

/**

* 计算器的基础操作（+ - × ÷）

* @param x

private void getResult (double x){

if(oper == "+"){result += x;}

else if(oper == "-"){result -= x;}

else if(oper == "×"){result *= x;}

else if(oper == "÷"){result /= x;}

else if(oper == "="){result = x;}

tf.setText(df.format(result));

}

/**

* 运算符号的事件监听

class Signs implements ActionListener{

public void actionPerformed(ActionEvent e) {

* 用ActionEvent对象的getActionCommand()方法

* 取得与引发事件对象相关的字符串

String str = e.getActionCommand();

/* sqrt求平方根 */

if(str.equals("sqrt")){

double i = Double.parseDouble(tf.getText());

if(i=0){

* String.valueOf() 转换为字符串

* df.format() 按要求保留四位小数

* Math.sqrt() 求算数平方根

tf.setText(String.valueOf(df.format(Math.sqrt(i))));

}

else{

tf.setText("负数不能开平方根");

}

/* log求常用对数 */

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

double i = Double.parseDouble(tf.getText());

if(i0){

tf.setText(String.valueOf(df.format(Math.log(i))));

}else{

tf.setText("负数不能求对数");

}

/* %求百分比 */

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

tf.setText(df.format(Double.parseDouble(tf.getText()) / 100));

}

/* 1/x求倒数 */

else if(str.equals("1/x")){

if(Double.parseDouble(tf.getText()) == 0){

tf.setText("除数不能为零");

}else{

tf.setText(df.format(1 / Double.parseDouble(tf.getText())));

}

/* sin求正弦函数 */

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

double i = Double.parseDouble(tf.getText());

tf.setText(String.valueOf(df.format(Math.sin(i))));

}

/* cos求余弦函数 */

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

double i = Double.parseDouble(tf.getText());

tf.setText(String.valueOf(df.format(Math.cos(i))));

}

/* tan求正切函数 */

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

double i = Double.parseDouble(tf.getText());

tf.setText(String.valueOf(df.format(Math.tan(i))));

}

/* n!求阶乘 */

else if(str.equals("n!")){

double i = Double.parseDouble(tf.getText());

if((i%2==0)||(i%2==1))//判断为整数放进行阶乘操作

{

int j = (int)i;//强制类型转换

int result=1;

for(int k=1;k=j;k++)

result *= k;

tf.setText(String.valueOf(result));

}

else

{

tf.setText("无法进行阶乘");

}

/* x^2求平方 */

else if(str.equals("x^2")){

double i = Double.parseDouble(tf.getText());

tf.setText(String.valueOf(df.format(i*i)));

}

/* x^3求立方 */

else if(str.equals("x^3")){

double i = Double.parseDouble(tf.getText());

tf.setText(String.valueOf(df.format(i*i*i)));

}

/* ′″角度转换 */

/**

* 将角度值转换成弧度值，方便三角函数的计算

else if(str.equals("′″")){

double i = Double.parseDouble(tf.getText());

tf.setText(String.valueOf(i/180*Math.PI));

}

else{

if(flag){

IfResult = false;

}

if(IfResult){

oper = str;

}else{

getResult(Double.parseDouble(tf.getText()));

oper = str;

IfResult = true;

}

/**

* 清除按钮的事件监听

class Clear implements ActionListener{

public void actionPerformed(ActionEvent e) {

* 用ActionEvent对象的getActionCommand()方法

* 取得与引发事件对象相关的字符串

String str = e.getActionCommand();

if(str == "C"){

tf.setText("0");

IfResult = true;

result = 0;

}else if(str == "-/+"){

double i = 0 - Double.parseDouble(tf.getText().trim());

tf.setText(df.format(i));

}else if(str == "Backspace"){

if(Double.parseDouble(tf.getText()) 0){

if(tf.getText().length() 1){

tf.setText(tf.getText().substring(0, tf.getText().length() - 1));

//使用退格删除最后一位字符

}else{

tf.setText("0");

IfResult = true;

}

}else{

if(tf.getText().length() 2){

tf.setText(tf.getText().substring(0, tf.getText().length() - 1));

}else{

tf.setText("0");

IfResult = true;

}

}else if(str == "CE"){

tf.setText("0");

IfResult = true;

}

/**

* 数字输入的事件监听

class Num implements ActionListener{

public void actionPerformed(ActionEvent e) {

String str = e.getActionCommand();

if(IfResult){

tf.setText("");

IfResult = false;

}

if(str=="π")

{

tf.setText(String.valueOf(Math.PI));

}

else if(str=="e")

{

tf.setText(String.valueOf(Math.E));

}

else{

tf.setText(tf.getText().trim() + str);

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

tf.setText("0");

IfResult = true;

flag = true;

}

/**

* 小数点的事件监听

class Dot implements ActionListener{

public void actionPerformed(ActionEvent e) {

IfResult = false;

if(tf.getText().trim().indexOf(".") == -1){

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

}

/**

* main方法

public static void main(String[] args) {

new Calcutor().setVisible(true);

}

java 计算器代码带括号求注释

//引入各种类文件

import java.awt.Button;

import java.awt.Color;

import java.awt.FlowLayout;

import java.awt.Font;

import java.awt.Frame;

import java.awt.GridLayout;

import java.awt.Panel;

import java.awt.TextField;

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

//定义JsqFrame继承Frame

class JsqFrame extends Frame {

double d1, d2; //定义两个double类型的变量

int op = -1; //定义两个int类型的变量

static TextField tf;//定义静态对象TextField

CalPanelL p1; //定义CalPanelL对象

// Constructor构造方法

JsqFrame() {

//以下设置属性

super("计算器");

setLayout(new FlowLayout());

setResizable(false);

setSize(250, 250);

tf = new TextField(18);

tf.setEditable(false);

tf.setBackground(Color.lightGray);

tf.setForeground(Color.red);

tf.setFont(new Font("Arial", Font.BOLD, 16));

add(tf);

p1 = new CalPanelL();

add(p1);

setVisible(true);

// addWindowListener(new Wclose());

}

//添加按钮继承Button类

class CalButton extends Button {

CalButton(String s) {

//设置按钮属性

super(s);

setBackground(Color.WHITE); //设置颜色为白色

}

//定义显示器继承Panel类

class CalPanelL extends Panel {

CalButton a, c, b0, b1, b2, b3, b4, b5, b6, b7, b8, b9, bPN, bPoint,

bAdd, bSub, bMul, bDiv, bL, bR, bLn, bEqual, bCE, bQuit;

CalPanelL() {

//设置显示器的属性

setLayout(new GridLayout(6, 4));

setFont(new Font("TimesRoman", Font.BOLD, 16));

a = new CalButton("");

c = new CalButton("");

b0 = new CalButton("0");

b1 = new CalButton("1");

b2 = new CalButton("2");

b3 = new CalButton("3");

b4 = new CalButton("4");

b5 = new CalButton("5");

b6 = new CalButton("6");

b7 = new CalButton("7");

b8 = new CalButton("8");

b9 = new CalButton("9");

bPN = new CalButton("+/-");

bPoint = new CalButton(".");

// 设置按钮

bAdd = new CalButton("+");

bSub = new CalButton("-");

bMul = new CalButton("*");

bDiv = new CalButton("/");

bL = new CalButton("(");

bR = new CalButton(")");

bLn = new CalButton("ln");

bEqual = new CalButton("=");

bCE = new CalButton("CE");

bQuit = new CalButton("退出");

// 加入按钮

add(a);

add(c);

add(bCE);

bCE.addActionListener(new PressBCE());

add(bQuit);

bQuit.addActionListener(new PressBQuit());

add(b7);

b7.addActionListener(new PressB7());

add(b8);

b8.addActionListener(new PressB8());

add(b9);

b9.addActionListener(new PressB9());

add(bDiv);

bDiv.addActionListener(new PressBDiv());

add(b4);

b4.addActionListener(new PressB4());

add(b5);

b5.addActionListener(new PressB5());

add(b6);

b6.addActionListener(new PressB6());

add(bMul);

bMul.addActionListener(new PressBMul());

add(b1);

b1.addActionListener(new PressB1());

add(b2);

b2.addActionListener(new PressB2());

add(b3);

b3.addActionListener(new PressB3());

add(bSub);

bSub.addActionListener(new PressBSub());

add(b0);

b0.addActionListener(new PressB0());

add(bPoint);

bPoint.addActionListener(new PressBPoint());

add(bPN);

bPN.addActionListener(new PressBPN());

;

add(bAdd);

bAdd.addActionListener(new PressBAdd());

add(bL);

bL.addActionListener(new PressBL());

add(bR);

bR.addActionListener(new PressBR());

add(bLn);

bLn.addActionListener(new PressBLn());

add(bEqual);

bEqual.addActionListener(new PressBEqual());

}

//定义PressBAdd实现ActionListener

//大体的意思是按计算机按键的时出发的时间，设置按键的监听[加号的监听事件]

class PressBAdd implements ActionListener {

public void actionPerformed(ActionEvent e) {

try {

String d1 = tf.getText();

op = 0;

tf.setText(d1 + "+");

} catch (Exception ee) {

}

//定义PressBSub实现ActionListener

//大体的意思是按计算机按键的时出发的时间，设置按键的监听[减号的监听事件]

class PressBSub implements ActionListener {

public void actionPerformed(ActionEvent e) {

try {

String d1 = tf.getText();

op = 1;

tf.setText(d1 + "-");

} catch (Exception ee) {

}

//定义PressBMul实现ActionListener

//大体的意思是按计算机按键的时出发的时间，设置按键的监听[乘号的监听事件]

class PressBMul implements ActionListener {

public void actionPerformed(ActionEvent e) {

try {

String d1 = tf.getText();

op = 2;

tf.setText(d1 + "*");

} catch (Exception ee) {

}

//定义PressBDiv实现ActionListener

//大体的意思是按计算机按键的时出发的时间，设置按键的监听[除号的监听事件]

class PressBDiv implements ActionListener {

public void actionPerformed(ActionEvent e) {

try {

String d1 = tf.getText();

op = 3;

tf.setText(d1 + "/");

} catch (Exception ee) {

}

//定义PressBL实现ActionListener

//大体的意思是按计算机按键的时出发的时间，设置按键的监听[向左键的监听事件]

class PressBL implements ActionListener {

public void actionPerformed(ActionEvent e) {

try {

String d1 = tf.getText();

op = 3;

tf.setText(d1 + "(");

} catch (Exception ee) {

}

//定义PressBR实现ActionListener

//大体的意思是按计算机按键的时出发的时间，设置按键的监听[向右键的监听事件]

class PressBR implements ActionListener {

public void actionPerformed(ActionEvent e) {

try {

String d1 = tf.getText();

op = 3;

tf.setText(d1 + ")");

} catch (Exception ee) {

}

//定义PressBEqual实现ActionListener

//大体的意思是按计算机按键的时出发的时间，设置按键的监听[等号的监听事件]

class PressBEqual implements ActionListener {

public void actionPerformed(ActionEvent e) {

try {

Jsq jsq = new Jsq();

String s = tf.getText();

System.out.println(s);

while (s.indexOf("(") + 1 0 s.indexOf(")") 0) {

String s1 = jsq.caculateHigh(s);

System.out.println(s1);

s = s1;

}

String str = jsq.cacluteMain(s);

System.out.println(str);

tf.setText(String.valueOf(str));

} catch (Exception ee) {

}

* 批量写吧

* 以下是按1、2、3等等的监听事件

* 还有清零的等等监听事件

class PressBLn implements ActionListener {

public void actionPerformed(ActionEvent e) {

try {

double x = Double.parseDouble(tf.getText());

double y;

y = Math.log10(x);

tf.setText(y + "");

} catch (Exception ee) {

}

class PressBCE implements ActionListener {

public void actionPerformed(ActionEvent e) {

tf.setText("");

}

class PressBPN implements ActionListener {

public void actionPerformed(ActionEvent e) {

try {

String text = tf.getText();

if (text != "") {

if (text.charAt(0) == '-')

tf.setText(text.substring(1));

else if (text.charAt(0) = '0' text.charAt(0) = '9')

tf.setText("-" + text.substring(0));

else if (text.charAt(0) == '.')

tf.setText("-0" + text.substring(0));

}

} catch (Exception ee) {

}

class PressBPoint implements ActionListener {

public void actionPerformed(ActionEvent e) {

String text = tf.getText();

if (text.lastIndexOf(".") == -1)

tf.setText(text + ".");

}

class PressB0 implements ActionListener {

public void actionPerformed(ActionEvent e) {

String text = tf.getText();

tf.setText(text + "0");

}

class PressB1 implements ActionListener {

public void actionPerformed(ActionEvent e) {

String text = tf.getText();

tf.setText(text + "1");

}

class PressB2 implements ActionListener {

public void actionPerformed(ActionEvent e) {

String text = tf.getText();

tf.setText(text + "2");

}

class PressB3 implements ActionListener {

public void actionPerformed(ActionEvent e) {

String text = tf.getText();

tf.setText(text + "3");

}

class PressB4 implements ActionListener {

public void actionPerformed(ActionEvent e) {

String text = tf.getText();

tf.setText(text + "4");

}

class PressB5 implements ActionListener {

public void actionPerformed(ActionEvent e) {

String text = tf.getText();

tf.setText(text + "5");

}

class PressB6 implements ActionListener {

public void actionPerformed(ActionEvent e) {

String text = tf.getText();

tf.setText(text + "6");

}

class PressB7 implements ActionListener {

public void actionPerformed(ActionEvent e) {

String text = tf.getText();

tf.setText(text + "7");

}

class PressB8 implements ActionListener {

public void actionPerformed(ActionEvent e) {

String text = tf.getText();

tf.setText(text + "8");

}

class PressB9 implements ActionListener {

public void actionPerformed(ActionEvent e) {

String text = tf.getText();

tf.setText(text + "9");

}

class PressBQuit implements ActionListener {

public void actionPerformed(ActionEvent e) {

System.exit(0);

}

public void Js() {

String text = tf.getText();

tf.setText(text);

}

跪求简单计算器的java代码，要入门级的编程~~

//////////////////////////这个很简单,方法也差不多////////////////////

import javax.swing.*;

import java.awt.event.*;

import java.awt.*;

public class Calculator extends JFrame implements ActionListener

{

///////////////菜单

JMenuBar mb;

JMenu mEdit,mFind,mHelp;

JMenuItem mEditCopy,mEditPaste;

JMenuItem mFindStandarded,mFindScience,mFindGroup;

JMenuItem mHelpTopic,mHelpAbout;

JPanel pan;

/////////////按钮

JTextField tf;

JButton butnull;

JButton butBackspace,butCE,butC;

JButton butMC,butMR,butMS,butM;

JButton but1,but2,but3,but4,but5,but6,but7,but8,but9,but0;

JButton butChu,butSqrt,butCheng,butYu,butJian,but1x,butDot,butJia,butEqual,butJJ;

Calculator()

{

mb =new JMenuBar();

mEdit =new JMenu("编辑(E)");

mEdit.setMnemonic('E');

mFind =new JMenu("查看(F)");

mFind.setMnemonic('F');

mHelp =new JMenu("帮助(H)");

mFind.setMnemonic('H');

mEditCopy =new JMenuItem("复制(C)");

mEditCopy.setMnemonic('C');

mEditPaste =new JMenuItem("粘贴(P)");

mEditCopy.setMnemonic('P');

mFindStandarded=new JMenuItem("标准型(T)");

mFindStandarded.setMnemonic('T');

mFindScience=new JMenuItem("科学型(S)");

mFindScience.setMnemonic('S');

mFindGroup =new JMenuItem("数字分组(I)");

mFindGroup.setMnemonic('I');

mHelpTopic =new JMenuItem("帮助主题(H)");

mHelpTopic.setMnemonic('H');

mHelpAbout =new JMenuItem("关于我们(A)");

mHelpAbout.setMnemonic('A');

////////////////////////////添加mb组件beginning

mb.add(mEdit);

mb.add(mFind);

mb.add(mHelp);

mEdit.add(mEditCopy);

mEdit.add(mEditPaste);

mFind.add(mFindStandarded);

mFind.add(mFindScience);

mFind.add(mFindGroup);

mHelp.add(mHelpTopic);

mHelp.add(mHelpAbout);//////////////ending

////////////////////////***创建计算机按钮***////////////////////

Color red =new Color(250,0,0);

Color green =new Color(0,127,0);

butnull =new JButton("?");

butnull.setForeground(red);

butnull.addActionListener(this);

butBackspace =new JButton("Backspace");

butBackspace.setForeground(green);

butCE =new JButton("CE");

butCE.setForeground(green);

butC =new JButton("C");

butC.addActionListener(this);

butC.setForeground(red);

butMC =new JButton("MC");

butMC.setForeground(green);

butMR =new JButton("MR");

butMR.setForeground(green);

butMS =new JButton("MS");

butMS.setForeground(green);

butM =new JButton("M+");

butM.setForeground(green);

butChu =new JButton("/");

butChu.addActionListener(this);

butChu.setForeground(red);

butCheng =new JButton("*");

butCheng.addActionListener(this);

butCheng.setForeground(red);

butJian =new JButton("-");

butJian.addActionListener(this);

butJian.setForeground(red);

butJia =new JButton("+");

butJia.addActionListener(this);

butJia.setForeground(red);

butEqual =new JButton("=");

butEqual.addActionListener(this);

butEqual.setForeground(red);

Color blue =new Color(0,0,250);

butSqrt =new JButton("sqrt");

butSqrt.setForeground(green);

butYu =new JButton("%");

butYu.setForeground(green);

but1x =new JButton("1/x");

but1x.setForeground(green);

butDot =new JButton(".");

butDot.setForeground(blue);

butDot.addActionListener(this);

butJJ =new JButton("+/-");

butJJ.setForeground(blue);

butJJ.addActionListener(this);

but1 =new JButton("1");

but1.addActionListener(this);

but1.setForeground(blue);

but2 =new JButton("2");

but2.addActionListener(this);

but2.setForeground(blue);

but3 =new JButton("3");

but3.addActionListener(this);

but3.setForeground(blue);

but4 =new JButton("4");

but4.addActionListener(this);

but4.setForeground(blue);

but5 =new JButton("5");

but5.addActionListener(this);

but5.setForeground(blue);

but6 =new JButton("6");

but6.addActionListener(this);

but6.setForeground(blue);

but7 =new JButton("7");

but7.addActionListener(this);

but7.setForeground(blue);

but8 =new JButton("8");

but8.addActionListener(this);

but8.setForeground(blue);

but9 =new JButton("9");

but9.addActionListener(this);

but9.setForeground(blue);

but0 =new JButton("0");

but0.addActionListener(this);

but0.setForeground(blue);///////////////////////////////ending

pan =new JPanel(null);//创建最大的panel

tf =new JTextField("0");//输入显示框

tf.setBounds(5,0,337,25);//显示框设置大小位置

tf.setBackground(Color.white);

tf.setHorizontalAlignment(JTextField.RIGHT);//输入框设置位子居右显示

tf.setEditable(false);

JPanel pa=new JPanel(new BorderLayout());//所有按钮的panel

pa.setBounds(5,35,340,240);

JPanel pp=new JPanel(new BorderLayout());//null,MC,MR,MS,M+的panel;pa的西

JPanel aa=new JPanel(new BorderLayout());//其余所有Button的panel;pa的中

JPanel p =new JPanel(new GridLayout(4,1));//MC,MR,MS,M+的Panel，pp的中北是一个butnull

JPanel a =new JPanel(new GridLayout(1,3));//backspace,ce,c的panel，aa的北

JPanel a2=new JPanel(new GridLayout(4,5));//其余的button的panel，aa的中

pa.add(pp,BorderLayout.WEST);

pa.add(aa,BorderLayout.CENTER);

pp.add(butnull,BorderLayout.NORTH);

pp.add(p,BorderLayout.CENTER);

p.add(butMC);

p.add(butMR);

p.add(butMS);

p.add(butM);

aa.add(a,BorderLayout.NORTH);

aa.add(a2,BorderLayout.CENTER);

a.add(butBackspace);

a.add(butCE);

a.add(butC);

a2.add(but7);

a2.add(but8);

a2.add(but9);

a2.add(butChu);

a2.add(butSqrt);

a2.add(but4);

a2.add(but5);

a2.add(but6);

a2.add(butCheng);

a2.add(butYu);

a2.add(but1);

a2.add(but2);

a2.add(but3);

a2.add(butJian);

a2.add(but1x);

a2.add(but0);

a2.add(butJJ);

a2.add(butDot);

a2.add(butJia);

a2.add(butEqual);

this.add(pan);

pan.add(tf);

pan.add(pa);

this.setTitle("我的计算器");

this.setJMenuBar(mb);

this.setBounds(200,300,353,330);//设置窗口大小

this.setResizable(false);

this.setVisible(true);

}

public static void main(String args[])

{

try

{

UIManager.setLookAndFeel(

UIManager.getSystemLookAndFeelClassName());

}

catch (Exception ex)

{

ex.printStackTrace();

}

new Calculator();

}

////////////////////********以下是监听设置和运算*******///////////////////

boolean b=true;//初始值设置为真未点运算符号

String fuhao="";//保存最后一次运算符号，用于进行上次结果的运算

String lastCommand="";//保存按等号前的最后的运算符号

double lastValue=0.0;//保存按等号钱的最后的输入框里的值

double value=0.0;//原值，当你点完运算符的时候计算之前的值

double fuzhi=0.0;

public void actionPerformed(ActionEvent click)/////////////////////行为监听设置

{

if(click.getSource()==butJJ)

{

fuzhi=Double.parseDouble(tf.getText());

if(tf.getText().equals("0")||tf.getText().equals("0."))

{

boolean b=true;

String fuhao="";

double value=0.0;

tf.setText("0");

}

else if(fuzhi0)

{

tf.setText((-fuzhi)+"");

}

else

{

tf.setText("-"+tf.getText());

}

if(click.getSource()==butnull)

{

}

if(click.getSource()==butC)

{

tf.setText("0");

lastCommand="";

lastValue=0.0;

b=true;

fuhao="";

value=0.0;

}

if(click.getSource()==but1)

{

if(b==false)

{

tf.setText("1");

b=true;

}

else if(tf.getText().equals("0"))

{

tf.setText("1");

}

else

{

tf.setText(tf.getText()+1);

}

if(click.getSource()==but2)

{

if(b==false)

{

tf.setText("2");

b=true;

}

else if(tf.getText().equals("0"))

{

tf.setText("2");

}

else

{

tf.setText(tf.getText()+2);

}

if(click.getSource()==but3)

{

if(b==false)

{

tf.setText("3");

b=true;

}

else if(tf.getText().equals("0"))

{

tf.setText("3");

}

else

{

tf.setText(tf.getText()+3);

}

if(click.getSource()==but4)

{

if(b==false)

{

tf.setText("4");

b=true;

}

else if(tf.getText().equals("0"))

{

tf.setText("4");

}

else

{

tf.setText(tf.getText()+4);

}

if(click.getSource()==but5)

{

if(b==false)

{

tf.setText("5");

b=true;

}

else if(tf.getText().equals("0"))

{

tf.setText("5");

}

else

{

tf.setText(tf.getText()+5);

}

if(click.getSource()==but6)

{

if(b==false)

{

tf.setText("6");

b=true;

}

else if(tf.getText().equals("0"))

{

tf.setText("6");

}

else

{

tf.setText(tf.getText()+6);

}

if(click.getSource()==but7)

{

if(b==false)

{

tf.setText("7");

b=true;

}

else if(tf.getText().equals("0"))

{

tf.setText("7");

}

else

{

tf.setText(tf.getText()+7);

}

if(click.getSource()==but8)

{

if(b==false)

{

tf.setText("8");

b=true;

}

else if(tf.getText().equals("0"))

{

tf.setText("8");

}

else

{

tf.setText(tf.getText()+8);

}

if(click.getSource()==but9)

{

if(b==false)

{

tf.setText("9");

b=true;

}

else if(tf.getText().equals("0"))

{

tf.setText("9");

}

else

{

tf.setText(tf.getText()+9);

}

if(click.getSource()==but0)

{

if(b==false)

{

tf.setText("0");

b=true;

}

else if(tf.getText().equals("0"))

{

tf.setText("0");

}

else

{

tf.setText(tf.getText()+0);

}

if(click.getSource()==butDot)

{

/////////code/////////////////////////////////////////////////////////////////////////////////////////////////////////???

int izhi=Integer.parseInt(tf.getText());

double dzhi=Double.parseDouble(tf.getText());

if(tf.getText().equals("0"))

{

tf.setText("0.");

}

else

{

if(tf.getText().equals("0."))

{

tf.setText("0.");

}

else

{

if(dzhi0)

{

izhi=izhi;

dzhi=dzhi;

if(dzhi==izhi)

{

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

}

else

{

izhi=-izhi;

dzhi=-dzhi;

if(dzhi==izhi)

{

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

}

if(click.getSource()==butJia)///////////////////////////////////////////////"+"

{

if(tf.getText().equals("0"))

{

}

else if(fuhao=="")

{

double tfvaluejia;

tfvaluejia=Double.parseDouble(tf.getText());

value=tfvaluejia;

tf.setText(""+value);

b=false;

fuhao="+";

}

else if(fuhao=="*")

{

double tfvalueCheng;

tfvalueCheng=Double.parseDouble(tf.getText());

value=value*tfvalueCheng;

tf.setText(""+value);

b=false;

}

else if(fuhao=="/")

{

double tfvalueChu;

tfvalueChu=Double.parseDouble(tf.getText());

value=value/tfvalueChu;

tf.setText(""+value);

b=false;

}

else if(fuhao=="-")

{

double tfvaluejian;

tfvaluejian=Double.parseDouble(tf.getText());

value=value-tfvaluejian;

tf.setText(""+value);

b=false;

}

else if(fuhao=="=")

{

double tfvaluejia;

tfvaluejia=Double.parseDouble(tf.getText());

value=tfvaluejia;

b=false;

}

else

{

double tfvaluejia;

tfvaluejia=Double.parseDouble(tf.getText());//2

value=value+tfvaluejia;

tf.setText(""+value);

b=false;

}

lastValue=Double.parseDouble(tf.getText());

fuhao="+";

lastCommand="+";

}

if(click.getSource()==butCheng)////////////////////////////////////////////////////////////"*"

{

if(tf.getText().equals("0"))

{

}

else if(fuhao=="")

{

double tfvalueCheng;

tfvalueCheng=Double.parseDouble(tf.getText());

value=tfvalueCheng;

tf.setText(""+value);

b=false;

fuhao="*";

}

else if(fuhao=="+")

{

double tfvaluejia;

tfvaluejia=Double.parseDouble(tf.getText());

value=value+tfvaluejia;

tf.setText(""+value);

b=false;

}

else if(fuhao=="/")

{

double tfvalueChu;

tfvalueChu=Double.parseDouble(tf.getText());

value=value/tfvalueChu;

tf.setText(""+value);

b=false;

}

else if(fuhao=="-")

{

double tfvaluejian;

tfvaluejian=Double.parseDouble(tf.getText());

value=value-tfvaluejian;

tf.setText(""+value);

b=false;

}

else if(fuhao=="=")

{

double tfvalueCheng;

tfvalueCheng=Double.parseDouble(tf.getText());

value=tfvalueCheng;

b=false;

}

else

{

double tfvalueCheng;

tfvalueCheng=Double.parseDouble(tf.getText());

value=value*tfvalueCheng;

tf.setText(""+value);

b=false;

}

lastValue=Double.parseDouble(tf.getText());

fuhao="*";

lastCommand="*";

}

if(click.getSource()==butChu)//////////////////////////////////////////////"/"

{

if(tf.getText().equals("0"))

{

}

else if(fuhao=="")

{

double tfvalueChu;

tfvalueChu=Double.parseDouble(tf.getText());

value=tfvalueChu;

tf.setText(""+value);

b=false;

fuhao="/";

}

else if(fuhao=="+")

{

double tfvaluejia;

tfvaluejia=Double.parseDouble(tf.getText());

value=value+tfvaluejia;

tf.setText(""+value);

b=false;

}

else if(fuhao=="*")

{

double tfvalueCheng;

tfvalueCheng=Double.parseDouble(tf.getText());

value=value*tfvalueCheng;

tf.setText(""+value);

b=false;

}

else if(fuhao=="-")

{

double tfvaluejian;

tfvaluejian=Double.parseDouble(tf.getText());

value=value-tfvaluejian;

tf.setText(""+value);

b=false;

}

else if(fuhao=="=")

{

double tfvalueCheng;

tfvalueCheng=Double.parseDouble(tf.getText());

value=tfvalueCheng;

b=false;

}

else

{

double tfvalueChu;

tfvalueChu=Double.parseDouble(tf.getText());

value=value/tfvalueChu;

tf.setText(""+value);

b=false;

}

lastValue=Double.parseDouble(tf.getText());

fuhao="/";

lastCommand="/";

}

if(click.getSource()==butJian)////////////////////////////////////////////////////////////////////////"-"

{

if(tf.getText().equals("0"))

{

}

else if(fuhao=="")

{

double tfvaluejian;

tfvaluejian=Double.parseDouble(tf.getText());

value=tfvaluejian;

tf.setText(""+value);

b=false;

fuhao="/";

}

else if(fuhao=="+")

{

double tfvaluejia;

tfvaluejia=Double.parseDouble(tf.getText());

value=value+tfvaluejia;

tf.setText(""+value);

b=false;

}

else if(fuhao=="*")

{

double tfvalueCheng;

tfvalueCheng=Double.parseDouble(tf.getText());

value=value*tfvalueCheng;

tf.setText(""+value);

b=false;

}

else if(fuhao=="/")

{

double tfvalueChu;

tfvalueChu=Double.parseDouble(tf.getText());

value=value/tfvalueChu;

tf.setText(""+value);

b=false;

}

else if(fuhao=="=")

{

double tfvalueCheng;

tfvalueCheng=Double.parseDouble(tf.getText());

value=tfvalueCheng;

b=false;

}

else

{

double tfvaluejian;

tfvaluejian=Double.parseDouble(tf.getText());

value=value-tfvaluejian;

tf.setText(""+value);

b=false;

}

lastValue=Double.parseDouble(tf.getText());

fuhao="-";

lastCommand="-";

}

if(click.getSource()==butEqual)//////////////////////////////////////////"="

{

if(tf.getText().equals("0"))

{

}

if(fuhao=="+")

{

double tfvaluejia;

tfvaluejia=Double.parseDouble(tf.getText());

value=value+tfvaluejia;

tf.setText(""+value);

b=false;

}

else if(fuhao=="*")

{

double tfvalueCheng;

tfvalueCheng=Double.parseDouble(tf.getText());

value=value*tfvalueCheng;

tf.setText(""+value);

b=false;

}

else if(fuhao=="/")

{

double tfvalueChu;

tfvalueChu=Double.parseDouble(tf.getText());

value=value/tfvalueChu;

tf.setText(""+value);

b=false;

}

else if(fuhao=="-")

{

double tfvaluejian;

tfvaluejian=Double.parseDouble(tf.getText());

value=value-tfvaluejian;

tf.setText(""+value);

b=false;

}

else if(fuhao=="=")

{

if(lastCommand=="+")

{

value = value +lastValue;

tf.setText(""+value);

b=false;

}

else if(lastCommand=="-")

{

value = value - lastValue;

tf.setText(""+value);

b=false;

}

if(lastCommand=="*")

{

value = value *lastValue;

tf.setText(""+value);

b=false;

}

if(lastCommand=="/")

{

value = value /lastValue;

tf.setText(""+value);

b=false;

}

fuhao="=";

}

求JAVA简易计算机源代码

试试这个

import java.util.*;

import java.awt.*;

import java.awt.event.*;

import javax.swing.*;

import java.applet.*;

public class SZJSQ extends JApplet implements ActionListener

{

boolean i=true;

private JButton num0=new JButton("0");

private JButton num1=new JButton("1");

private JButton num2=new JButton("2");

private JButton num3=new JButton("3");

private JButton num4=new JButton("4");

private JButton num5=new JButton("5");

private JButton num6=new JButton("6");

private JButton num7=new JButton("7");

private JButton num8=new JButton("8");

private JButton num9=new JButton("9");

private JButton zuok=new JButton("(");

private JButton youk=new JButton(")");

private JButton dian=new JButton(".");

private JButton NULL=new JButton("N");

private JButton plu=new JButton("+");

private JButton min=new JButton("-");

private JButton mul=new JButton("x");

private JButton div=new JButton("/");

private JButton equ=new JButton("=");

private JButton cle=new JButton("C");//清除

private JTextField space=new JTextField(30);

public void init()

{

JPanel text=new JPanel();

text.setLayout(new FlowLayout());

text.add(space);

JPanel buttons=new JPanel();

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

buttons.add(num9);

buttons.add(num8);

buttons.add(num7);

buttons.add(plu);

buttons.add(num6);

buttons.add(num5);

buttons.add(num4);

buttons.add(min);

buttons.add(num3);

buttons.add(num2);

buttons.add(num1);

buttons.add(mul);

buttons.add(num0);

buttons.add(cle);

buttons.add(equ);

buttons.add(div);

buttons.add(zuok);

buttons.add(youk);

buttons.add(dian);

buttons.add(NULL);

(num9).addActionListener(this);

(num8).addActionListener(this);

(num7).addActionListener(this);

(num6).addActionListener(this);

(num5).addActionListener(this);

(num4).addActionListener(this);

(num3).addActionListener(this);

(num2).addActionListener(this);

(num1).addActionListener(this);

(num0).addActionListener(this);

(plu).addActionListener(this);

(min).addActionListener(this);

(mul).addActionListener(this);

(div).addActionListener(this);

(equ).addActionListener(this);

(cle).addActionListener(this);

(zuok).addActionListener(this);

(youk).addActionListener(this);

(dian).addActionListener(this);

setLayout(new BorderLayout());

add("North",text);

add("South",buttons);

space.setText("0");

}

public void actionPerformed(ActionEvent e)

{

if(e.getSource()==num9)

{

if(i==true)

{

space.setText("9");

i=false;

}

else space.setText(space.getText()+'9');

}

if(e.getSource()==num8)

{

if(i==true)

{

space.setText("8");

i=false;

}

else space.setText(space.getText()+'8');

}

if(e.getSource()==num7)

{

if(i==true)

{

space.setText("7");

i=false;

}

else space.setText(space.getText()+'7');

}

if(e.getSource()==num6)

{

if(i==true)

{

space.setText("6");

i=false;

}

else space.setText(space.getText()+'6');

}

if(e.getSource()==num5)

{

if(i==true)

{

space.setText("5");

i=false;

}

else space.setText(space.getText()+'5');

}

if(e.getSource()==num4)

{

if(i==true)

{

space.setText("4");

i=false;

}

else space.setText(space.getText()+'4');

}

if(e.getSource()==num3)

{

if(i==true)

{

space.setText("3");

i=false;

}

else space.setText(space.getText()+'3');

}

if(e.getSource()==num2)

{

if(i==true)

{

space.setText("2");

i=false;

}

else space.setText(space.getText()+'2');

}

if(e.getSource()==num1)

{

if(i==true)

{

space.setText("1");

i=false;

}

else space.setText(space.getText()+'1');

}

if(e.getSource()==num0)

{

if(i==true)

{

space.setText("0");

i=false;

}

else space.setText(space.getText()+'0');

}

if(e.getSource()==zuok)

{

if(i==true)

{

space.setText("(");

i=false;

}

else space.setText(space.getText()+'(');

} if(e.getSource()==youk)

{

if(i==false)

space.setText(space.getText()+')');

}

if(e.getSource()==dian)

{

if(i==false)

space.setText(space.getText()+'.');

}

if(e.getSource()==plu)

{

space.setText(space.getText()+'+');

i=false;

}

if(e.getSource()==min)

{

space.setText(space.getText()+'-');

i=false;

}

if(e.getSource()==mul)

{

space.setText(space.getText()+'*');

i=false;

}

if(e.getSource()==div)

{

space.setText(space.getText()+'/');

i=false;

}

if(e.getSource()==equ)

{

space.setText(String.valueOf(Calculator(space.getText())));

i=true;

}

if(e.getSource()==cle)

{

space.setText("0");

i=true;

}

public double Calculator(String f)//科学计算

{

int i=0,j=0,k;

char c;

StringBuffer s=new StringBuffer();

s.append(f);

s.append('=');

String formula=s.toString();

char[] anArray;

anArray=new char[50];

StackCharacter mystack=new StackCharacter();

while(formula.charAt(i)!='=')

{

c=formula.charAt(i);

switch(c)

{

case '(': mystack.push(new Character(c));

i++;

break;

case ')':

while(mystack.peek().charValue()!='(')

{

anArray[j++]=mystack.pop().charValue();

}

mystack.pop();

i++;

break;

case '+':

case '-':

while(!mystack.empty()mystack.peek().charValue()!='(')

{

anArray[j++]=mystack.pop().charValue();

}

mystack.push(new Character(c));

i++;

break;

case '*':

case '/':

while(!mystack.empty()(mystack.peek().charValue()=='*'||mystack.peek().charValue()=='/'))

{

anArray[j++]=mystack.pop().charValue();

}

mystack.push(new Character(c));

i++;

break;

case' ': i++;

break;

default: while((c='0'c='9')||c=='.')

{

anArray[j++]=c;

i++;

c=formula.charAt(i);

}

anArray[j++]='#';

break;

}

while(!(mystack.empty()))

anArray[j++]=mystack.pop().charValue();

i=0;

int count;

double a,b,d;

StackDouble mystack1 =new StackDouble();

while(ij)

{

c=anArray[i];

switch(c)

{

case '+':

a=mystack1.pop().doubleValue();

b=mystack1.pop().doubleValue();

d=b+a;

mystack1.push(new Double(d));

i++;

break;

case '-':

a=mystack1.pop().doubleValue();

b=mystack1.pop().doubleValue();

d=b-a;

mystack1.push(new Double(d));

i++;

break;

case '*':

a=mystack1.pop().doubleValue();

b=mystack1.pop().doubleValue();

d=b*a;

mystack1.push(new Double(d));

i++;

break;

case '/':

a=mystack1.pop().doubleValue();

b=mystack1.pop().doubleValue();

if(a!=0)

{

d=b/a;

mystack1.push(new Double(d));

i++;

}

else

{

System.out.println("Error!");

}

break;

default:

d=0;count=0;

while((c='0'c='9'))

{

d=10*d+c-'0';

i++;

c=anArray[i];

}

if(c=='.')

{

i++;

c=anArray[i];

while((c='0'c='9'))

{

count++;

d=d+(c-'0')/Math.pow(10,count);

i++;

c=anArray[i];

}

if(c=='#')

mystack1.push(new Double(d));

i++;

break;

}

return(mystack1.peek().doubleValue());

}

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