简单计算器java代码 java编程计算器

JAVA简单咋做，计算器代码

简单写了下，代码如下请参照：

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/**

* 计算器类

* @author Administrator

public class Calculator extends JFrame implements ActionListener {

private static final long serialVersionUID = 3868243398506940702L;

// 文本框

private JTextField result;

// 按钮数组

private JButton[] buttons;

// 按钮文本

private final String[] characters = { "7", "8", "9", "/", "4", "5", "6",

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

// 是否为第一个输入的数字

private boolean isFirstDigit = true;

// 运算结果

private double resultNum = 0.0;

// 运算符

private String operator = "=";

public Calculator(String title) {

// 设置标题栏

super(title);

// 初始化各组件

init();

// 注册各组件监听器

registerListener();

// 显示窗体

setVisible(true);

}

/**

* 初始化各组件

private void init() {

// 常用属性初始化

setSize(220, 200);

setResizable(false);

setLocationRelativeTo(null);

setDefaultCloseOperation(EXIT_ON_CLOSE);

/* 文本框对象初始化 */

result = new JTextField("0");

// 文本右对齐

result.setHorizontalAlignment(JTextField.RIGHT);

// 设置是否可编辑

result.setEditable(false);

/* 按钮初始化 */

buttons = new JButton[characters.length];

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

buttons[i] = new JButton(characters[i]);

buttons[i].setFocusable(false); // 不允许按钮定位焦点

}

/* 将文本框与按钮添加到窗体中 */

add(result, BorderLayout.NORTH);

JPanel pnl = new JPanel(new GridLayout(4, 4, 5, 5));

for (JButton jButton : buttons) {

pnl.add(jButton);

}

add(pnl);

this.getContentPane().setFocusable(true);

}

/**

* 注册监听器

private void registerListener() {

for (JButton jButton : buttons) {

jButton.addActionListener(this);

}

// 注册键盘事件

this.getContentPane().addKeyListener(new KeyAdapter() {

@Override

public void keyPressed(KeyEvent e) {

String text = String.valueOf(e.getKeyChar());

if (Character.isDigit(text.charAt(0)) || ".".equals(text)) { // 数字或小数点

handleNumber(text);

} else if ("+-*/=".indexOf(text) != -1) { // 运算符

handleOperator(text);

} else if (e.getKeyCode() == 8) { // 退格键

String tmp = result.getText().trim();

if (tmp.length() == 1) {

result.setText("0");

isFirstDigit = true;

} else {

result.setText(tmp.substring(0, tmp.length() - 1));

}

});

}

@Override

public void actionPerformed(ActionEvent e) {

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

String text = btn.getText().trim();

if (Character.isDigit(text.charAt(0)) || ".".equals(text)) { // 处理数字和小数点

handleNumber(text);

} else { // 处理运算符

handleOperator(text);

}

/**

* 处理数字和小数点

* @param text

private void handleNumber(String text) {

if (isFirstDigit) { // 第一次输入

if (".".equals(text)) {

this.result.setText("0.");

} else {

this.result.setText(text);

}

} else if ("0".equals(text) "0".equals(this.result.getText())) {

isFirstDigit = true;

return;

} else if (".".equals(text) this.result.getText().indexOf(".") == -1) {

this.result.setText(this.result.getText() + ".");

} else if (!".".equals(text)) {

this.result.setText(this.result.getText() + text);

}

isFirstDigit = false;

}

/**

* 处理运算符

* @param text

private void handleOperator(String text) {

switch (operator) { // 处理各项运算适用于JDK1.7版本的

case "+":

resultNum += Double.parseDouble(this.result.getText());

break;

case "-":

resultNum -= Double.parseDouble(this.result.getText());

break;

case "*":

resultNum *= Double.parseDouble(this.result.getText());

break;

case "/":

resultNum /= Double.parseDouble(this.result.getText());

break;

case "=":

resultNum = Double.parseDouble(this.result.getText());

break;

}

// 将文本框的值修改为运算结果

this.result.setText(String.valueOf(resultNum));

// 将点击的运算符放入operator保存

operator = text;

// 下一个数字第一次点击

isFirstDigit = true;

}

public static void main(String[] args) {

new Calculator("My Calculator");

}

运行结果如下：

用JAVA编写一个计算器

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

用JAVA编写一个简单的计算器，要求如下

然后通过输入显示结果，比如说：

以下是上图计算器的代码:

package Computer;

import java.awt.BorderLayout;

import java.awt.Color;

import java.awt.Container;

import java.awt.Font;

import java.awt.GridLayout;

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

import java.util.Stack;

import javax.swing.JApplet;

import javax.swing.JButton;

import javax.swing.JFrame;

import javax.swing.JPanel;

import javax.swing.JTextField;

public class Count extends JApplet implements ActionListener

{

/**

private static final long serialVersionUID = 1L;

private JTextField textField = new JTextField("请输入");

String operator = "";//操作

String input = "";//输入的式子

boolean flag = true;

// boolean flag1 = true;

// boolean flag2 = true;

public void init()//覆写Applet里边的init方法

{

Container C = getContentPane();

JButton b[] = new JButton[16];

JPanel panel = new JPanel();

C.add(textField, BorderLayout.NORTH);

C.add(panel,BorderLayout.CENTER);

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

String name[]={"7","8","9","+","4","5","6","-","1","2","3","*","0","C","=","/"};//设置按钮

for(int i=0;i16;i++)//添加按钮

{

b[i] = new JButton(name[i]);

b[i].setBackground(new Color(192,192,192));

b[i].setForeground(Color.BLUE);//数字键设置为蓝颜色

if(i%4==3)

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

b[i].setFont(new Font("宋体",Font.PLAIN,16));//设置字体格式

panel.add(b[i]);

b[i].addActionListener(this);

}

b[13].setForeground(Color.RED);//非数字键，即运算键设置为红颜色

b[13].setForeground(Color.RED);

}

public void actionPerformed(ActionEvent e)

{

int cnt = 0;

String actionCommand = e.getActionCommand();

if(actionCommand.equals("+")||actionCommand.equals("-")||actionCommand.equals("*") ||actionCommand.equals("/"))

input +=" "+actionCommand+" ";//设置输入，把输入的样式改成需要的样子

else if(actionCommand.equals("C"))

input = "";

else if(actionCommand.equals("="))//当监听到等号时，则处理 input

{

input+= "="+compute(input);

textField.setText(input);

input="";

cnt = 1;

}

else

input += actionCommand;//数字为了避免多位数的输入不需要加空格

if(cnt==0)

textField.setText(input);

}

private String compute(String input)//即1237 的样例

{

String str[];

str = input.split(" ");

StackDouble s = new StackDouble();

double m = Double.parseDouble(str[0]);

s.push(m);

for(int i=1;istr.length;i++)

{

if(i%2==1)

{

if(str[i].compareTo("+")==0)

{

double help = Double.parseDouble(str[i+1]);

s.push(help);

}

if(str[i].compareTo("-")==0)

{

double help = Double.parseDouble(str[i+1]);

s.push(-help);

}

if(str[i].compareTo("*")==0)

{

double help = Double.parseDouble(str[i+1]);

double ans = s.peek();//取出栈顶元素

s.pop();//消栈

ans*=help;

s.push(ans);

}

if(str[i].compareTo("/")==0)

{

double help = Double.parseDouble(str[i+1]);

double ans = s.peek();

s.pop();

ans/=help;

s.push(ans);

}

double ans = 0d;

while(!s.isEmpty())

{

ans+=s.peek();

s.pop();

}

String result = String.valueOf(ans);

return result;

}

public static void main(String args[])

{

JFrame frame = new JFrame("Count");

Count applet = new Count();

frame.getContentPane().add(applet, BorderLayout.CENTER);

applet.init();//applet的init方法

applet.start();//线程开始

frame.setSize(350, 400);//设置窗口大小

frame.setVisible(true);//设置窗口可见

}

JAVA 编写计算器要代码最简单的

学java的时候自己编的，很简单，能够连续输入计算式后进行计算

import java.awt.BorderLayout;

import java.awt.Color;

import java.awt.FlowLayout;

import java.awt.Font;

import java.awt.GridLayout;

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

import java.text.NumberFormat;

import java.util.ArrayList;

import javax.swing.JButton;

import javax.swing.JFrame;

import javax.swing.JPanel;

import javax.swing.JTextField;

/**简易计算器，能够进行简单的计算

* @see 2008.12.9

public class CalculatorA

implements ActionListener{

private JFrame frame;

private JTextField field;

private JButton[] allButtons;

private JButton clearButton;

// private JButton backButton;

String result="";//保存结果

StringBuilder sb = new StringBuilder();//保存要进行的计算式

int x = 0; //用来判断上一次的事件类型

String str = "123+456-789*0.=/";

ArrayListString arrayList = new ArrayListString();//保存计算式，通过方法进行运算

public CalculatorA(){

frame = new JFrame("我的计算器v1.1");

frame.setLocation(300,300);

field = new JTextField(25);

allButtons = new JButton[16];

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

allButtons[i]= new JButton(str.substring(i,i+1));

}

clearButton = new JButton("CLEAR");

// backButton = new JButton("——");

init();

setFondAndColor();

addEventHander();

}

public void init(){

frame.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(field);

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

centerPanel.add(allButtons[i]);

}

southPanel.add(clearButton);

//southPanel.add(backButton);

frame.add(northPanel,BorderLayout.NORTH);

frame.add(centerPanel,BorderLayout.CENTER);

frame.add(southPanel,BorderLayout.SOUTH);

}

//设置输入字体

public void setFondAndColor(){

field.setFont(new Font("宋体",Font.BOLD,24));

field.setBackground(new Color(100,200,200));

field.setForeground(Color.RED);

//设置字体从右起始

field.setHorizontalAlignment(JTextField.RIGHT);

}

public void showMi(){

frame.pack();

frame.setResizable(false);

frame.setVisible(true);

frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

}

public void addEventHander(){

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

allButtons[i].addActionListener(this);

}

clearButton.addActionListener(this);

// backButton.addActionListener(this);

}

@Override

public void actionPerformed(ActionEvent e) {

String str = e.getActionCommand();//取得当前事件返回的值

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

if(x == 0){ //当x为0时表示还没有进行输入

result=str;

sb.append(str);

field.setText(str);

x = 1;

}

else if(x == 1){

result = result +str;

sb.append(str);

field.setText(result);

x = 1;

}

else if(x == 2){

sb.delete(0,sb.length());

result = result+str;

sb.append(str);

field.setText(result);

x = 1;

}

else if(x == 3){

result = str;

sb.delete(0,sb.length());

arrayList.clear();

field.setText(str);

sb.append(str);

field.setText(str);

x = 1;

}

else if(x == 4){

result ="";

sb.delete(0,sb.length());

arrayList.clear();

result = str;

sb.append(str);

field.setText(str);

x = 1;

}

else{

result = result +str;

sb.append(str);

field.setText(result);

x = 1;

}

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

if(x == 0){

field.setText("");

x = 2;

}

else if(x == 1){

result = result + str;

arrayList.add(sb.toString());

arrayList.add(str);

sb.append(str);

field.setText(result);

x = 2;

}

else if(x == 2){

x = 2;

}

else if(x == 3){

field.setText(result+str);

arrayList.add(result);

arrayList.add(str);

result = result+str;

x = 2;

}

else if(x == 4){

result ="";

sb.delete(0,sb.length());

arrayList.clear();

x = 2;

}

else{

field.setText(result+str);

arrayList.add(result);

arrayList.add(str);

result = result+str;

x = 2;

}

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

if(x == 0){

field.setText("0");

arrayList.clear();

result = "0";

x = 3;

}

else if(x == 1){

try{

arrayList.add(sb.toString());

arrayList = getResult(arrayList);

result = arrayList.get(0);

field.setText(result);

arrayList.clear();

x = 3;

}catch(Exception e1){

field.setText("数据格式异常");

x = 0;

}

else if(x == 2){

field.setText("数据格式错误.....");

arrayList.clear();

x = 0;

}

else if(x == 3){

field.setText(result);

x = 3;

}

else if(x == 4){

result ="";

sb.delete(0,sb.length());

arrayList.clear();

x = 3;

}

else {

try{

arrayList.add(sb.toString());

arrayList = getResult(arrayList);

result = arrayList.get(0);

field.setText(result);

arrayList.clear();

x = 3;

}catch(Exception e1){

field.setText("数据格式异常");

x = 0;

}

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

arrayList.clear();

field.setText("0");

arrayList.add("0");

x = 4;

}

else{

if(result.length()1){

result = result.substring(0,result.length()-1);

if(sb.length()0){

sb.delete(sb.length()-1,sb.length());

}

else {

sb.delete(0,1);

}

field.setText(result);

x = 5;

}

else{

result = "";

sb.delete(0,sb.length());

arrayList.clear();

field.setText("0");

x = 0;

}

public static ArrayListString getResult(ArrayListString list){

String res = null;

String[] s = {"/","*","-","+"};

int i=0;

if(list.size()1){

for(;is.length;){

if(s[i].equals("/")){

for(int j=0;jlist.size();j++){

if(list.get(j).equals(s[i])){

res = Double.toString(Double.parseDouble(list.get(j-1))/Double.parseDouble(list.get(j+1)));

//本地的数据格式

NumberFormat nf = NumberFormat.getInstance();

res = nf.format(Double.parseDouble(res));

res = getChange(res);

list.set(j-1,res);

list.remove(j);

getResult(list);

}

i++;

}

else if(s[i].equals("*")){

for(int j=0;jlist.size();j++){

if(list.get(j).equals(s[i])){

res = Double.toString(Double.parseDouble(list.get(j-1))*Double.parseDouble(list.get(j+1)));

NumberFormat nf = NumberFormat.getInstance();

res = nf.format(Double.parseDouble(res));

res = getChange(res);

list.set(j-1,res);

list.remove(j);

getResult(list);

}

i++;

}

else if(s[i].equals("-")){

for(int j=0;jlist.size();j++){

if(list.get(j).equals(s[i])){

res = Double.toString(Double.parseDouble(list.get(j-1))-Double.parseDouble(list.get(j+1)));

NumberFormat nf = NumberFormat.getNumberInstance();

res = nf.format(Double.parseDouble(res));

res = getChange(res);

list.set(j-1,res);

list.remove(j);

getResult(list);

}

i++;

}

else {

for(int j=0;jlist.size();j++){

if(list.get(j).equals(s[i])){

res = Double.toString(Double.parseDouble(list.get(j-1))+Double.parseDouble(list.get(j+1)));

NumberFormat nf = NumberFormat.getInstance();

res = nf.format(Double.parseDouble(res));

res = getChange(res);

list.set(j-1,res);

list.remove(j);

getResult(list);

}

i++;

}

return list;

}

//对数字字符串进行排除不必要符号

public static String getChange(String res){

String s_temp = "";

char[] c = new char[res.length()];

for(int k=0;kc.length;k++){

c[k] = res.charAt(k);

}

for(int k=0;kc.length;k++){

if((c[k]= '0' c[k]= '9')|| c[k] == '.'){

s_temp += c[k];

}

return s_temp;

}

public static void main(String[] args){

new CalculatorA().showMi();

}

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简单计算器java代码 java编程计算器

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