求簡單java寫計算器代碼加減乘除

import javax.swing.*;

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import java.awt.*;

import java.awt.event.*;

public class Calculator extends JFrame implements ActionListener

{

private boolean dotExist, operated, equaled; // 幫助運算的布爾變量

private double storedNumber; // 目前的結(jié)果

private char lastOperator; // 表示上一運算符

private JTextField operation; // 結(jié)果欄

private JButton dot, plus, minus, multi, div, sqrt, equal, changePN, clear; // 運算符

private JButton[] numbers; // 數(shù)字

// 構(gòu)造者

public Calculator()

{

setTitle("Calculator");

// 初始化變量

dotExist = false; // 表示當前的數(shù)是否有小數(shù)點

operated = false; // 表示任意運算符是否被按下

equaled = false; // 表示等號是否被按下

storedNumber = 0;

lastOperator = '?';

// 初始化窗口變量

operation = new JTextField("0");

operation.setEditable(false);

numbers = new JButton[10];

for (int i = 0; i 10; i++)

numbers[i] = new JButton("" + i);

dot = new JButton(".");

plus = new JButton("+");

minus = new JButton("-");

multi = new JButton("*");

div = new JButton("/");

sqrt = new JButton("√");

equal = new JButton("=");

changePN = new JButton("±");

clear = new JButton("AC");

// 將窗口物體放入窗口

GridBagLayout layout = new GridBagLayout();

getContentPane().setLayout(layout);

addComponent(layout, operation, 0, 0, 4, 1);

addComponent(layout, numbers[1], 1, 0, 1, 1);

addComponent(layout, numbers[2], 1, 1, 1, 1);

addComponent(layout, numbers[3], 1, 2, 1, 1);

addComponent(layout, numbers[4], 2, 0, 1, 1);

addComponent(layout, numbers[5], 2, 1, 1, 1);

addComponent(layout, numbers[6], 2, 2, 1, 1);

addComponent(layout, numbers[7], 3, 0, 1, 1);

addComponent(layout, numbers[8], 3, 1, 1, 1);

addComponent(layout, numbers[9], 3, 2, 1, 1);

addComponent(layout, dot, 4, 0, 1, 1);

addComponent(layout, numbers[0], 4, 1, 1, 1);

addComponent(layout, sqrt, 4, 2, 1, 1);

addComponent(layout, plus, 1, 3, 1, 1);

addComponent(layout, minus, 2, 3, 1, 1);

addComponent(layout, multi, 3, 3, 1, 1);

addComponent(layout, div, 4, 3, 1, 1);

addComponent(layout, equal, 5, 0, 2, 1);

addComponent(layout, changePN, 5, 2, 1, 1);

addComponent(layout, clear, 5, 3, 1, 1);

}

// 對按鈕進行反應(yīng)的方法

public void actionPerformed(ActionEvent e)

{

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

if (btn == clear)

{

operation.setText("0");

dotExist = false;

storedNumber = 0;

lastOperator = '?';

}

else if (btn == equal)

{

operate('=');

equaled = true;

}

else if (btn == plus)

{

operate('+');

equaled = false;

}

else if (btn == minus)

{

operate('-');

equaled = false;

}

else if (btn == multi)

{

operate('*');

equaled = false;

}

else if (btn == div)

{

operate('/');

equaled = false;

}

else if (btn == changePN)

{

operate('p');

operate('=');

equaled = true;

}

else if (btn == sqrt)

{

operate('s');

operate('=');

equaled = true;

}

else

{

if (equaled)

storedNumber = 0;

for (int i = 0; i 10; i++)

if (btn == numbers[i])

{

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

operation.setText("" + i);

else if(! operated)

operation.setText(operation.getText() + i);

else

{

operation.setText("" + i);

operated = false;

}

}

if (btn == dot ! dotExist)

{

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

dotExist = true;

}

}

}

// 進行運算的方法

private void operate(char operator)

{

double currentNumber = Double.valueOf(operation.getText()).doubleValue();

if (lastOperator == '?')

storedNumber = currentNumber;

else if (lastOperator == '+')

storedNumber += currentNumber;

else if (lastOperator == '-')

storedNumber -= currentNumber;

else if (lastOperator == '*')

storedNumber *= currentNumber;

else if (lastOperator == '/')

storedNumber /= currentNumber;

else if (lastOperator == 'p')

storedNumber *= -1;

else if (lastOperator == 's')

storedNumber = Math.sqrt(currentNumber);

else if (lastOperator == '=' equaled)

storedNumber = currentNumber;

operation.setText("" + storedNumber);

operated = true;

lastOperator = operator;

}

// 快捷使用GridBagLayout的方法

private void addComponent(GridBagLayout layout, Component component, int row, int col, int width, int height)

{

GridBagConstraints constraints = new GridBagConstraints();

constraints.fill = GridBagConstraints.BOTH;

constraints.insets = new Insets(10, 2, 10, 2);

constraints.weightx = 100;

constraints.weighty = 100;

constraints.gridx = col;

constraints.gridy = row;

constraints.gridwidth = width;

constraints.gridheight = height;

layout.setConstraints(component, constraints);

if (component instanceof JButton)

((JButton)component).addActionListener(this);

getContentPane().add(component);

}

// 主方法初始化并顯示窗口

public static void main(String[] args)

{

Calculator calc = new Calculator();

calc.setSize(290, 400);

calc.setVisible(true);

}

}

用JAVA語言在網(wǎng)頁里實現(xiàn)加減乘除算法的源代碼要怎么寫吖？！

public class Excer{

public static void main(String args[])

{

Excer ex=new Excer();

int x=0;

int y=0;

ex.math(x,y);

}

void math(int x,int y){

MyMath mm = new MyMath();

System.out.println("x="+x+" ,y="+y);

System.out.println("x+y="+mm.plus(x,y));

System.out.println("x-y="+mm.minus(x,y));

System.out.println("x*y="+mm.multi(x,y));

System.out.println("x/y="+mm.div(x,y));

}

}

class MyMath

{

int plus(int a,int b)

{

return(a+b);

}

int minus(int a,int b)

{

return(a-b);

}

int multi(int a,int b)

{

return(a*b);

}

float div(int a,int b)

{

return ((float)a/b);

}

}

求：Java 計算器加減乘除代碼 注釋

public class MyComputer implements ActionListener{

private boolean appendnumber = false;

private boolean append = false;

private boolean flag = false;

private String temp1 = null;

private String op1 = null;

private JTextField jtf = new JTextField("0.",28);

public MyComputer(){

init();

}

private void init() {

/*

* 下面都是在畫計算機界面你想看也可以，

* 不看也行，具體計算在public void

* actionPerformed(ActionEvent e)

* 里

*/

JFrame frame = new JFrame("我的計算器");

JPanel panelTop = new JPanel();

panelTop.setLayout(new FlowLayout());

panelTop.add(jtf);

JPanel panelBotton = new JPanel();

String[] str = {"BackSpace","CE","C","+",

"7","8","9","-",

"4","5","6","*",

"1","2","3","/",

"0","+/-",".","="};

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

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

for(int i = 0;i jb.length;i++)

{

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

panelBotton.add(jb[i]);

jb[i].addActionListener(this);

}

frame.add(panelTop,BorderLayout.NORTH);

frame.add(panelBotton);

frame.setSize(400, 400);

frame.setVisible(true);

}

public static void main(String[] args) {

new MyComputer();

}

public void actionPerformed(ActionEvent e) {

String comm = e.getActionCommand();//獲得button里的數(shù)據(jù)

/*

* "0123456789".indexOf(comm)!=-1是判斷button里獲得的數(shù)據(jù)

* 是0---9的情況

*/

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

if(!appendnumber){

jtf.setText(comm);

appendnumber = true;

}else{

jtf.setText(jtf.getText()+comm);

}

}

/*

* 判斷button里獲得的數(shù)據(jù)是加減乘除的情況

*/

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

//在遇到加減乘除的符號時我們先存儲剛輸入的值

temp1 = jtf.getText();

//然后存儲符號

op1 = comm;

/*

* 然后可以重新輸入數(shù)據(jù)到輸入框，所以這時候我們

* 不能追加數(shù)據(jù)，設(shè)置追加數(shù)據(jù)標志為false

*/

appendnumber = false;

}

/*

* 判斷button里獲得的數(shù)據(jù)是等號的情況

*/

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

if(temp1==null||"".equals(temp1))return;

/*

* 遇到等號的時候，我們?nèi)〕鰟偛疟４娴臄?shù)據(jù)和當前輸入的數(shù)據(jù)做運算

*/

double num1 = Double.parseDouble(temp1);//轉(zhuǎn)化數(shù)據(jù)成double型的

double num2 = Double.parseDouble(jtf.getText());//轉(zhuǎn)化數(shù)據(jù)成double型的

//取出剛才保存的符號看是加減乘除的那種運算

if("+".equals(op1)){

num1+=num2;

}

if("-".equals(op1)){

num1-=num2;

}

if ("*".equals(op1)) {

num1*=num2;

}

if("/".equals(op1)){

num1/=num2;

}

jtf.setText(num1+"");

appendnumber = false;

}

/*

* 判斷button里獲得的數(shù)據(jù)是小數(shù)點的情況

*/

else if (".".equals(comm)) {

if(jtf.getText().indexOf(".")==-1){

append = true;

}

if (append) {

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

append = false;

appendnumber = true;

}

}

/*

* 判斷button里獲得的數(shù)據(jù)是在數(shù)據(jù)前面加正負號的情況

*/

else if ("+/-".equals(comm)) {

if(!flag){

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

flag = true;

}

else{

String result = jtf.getText().substring(1, jtf.getText().length());

jtf.setText(result);

flag = false;

}

}

/*

* 判斷button里獲得的數(shù)據(jù)是清除輸入框的情況

*/

else if ("C".equals(comm)) {

jtf.setText("0.");

appendnumber = false;

}

/*

* 判斷button里獲得的數(shù)據(jù)是清除輸入框的情況

*/

else if ("CE".equals(comm)) {

jtf.setText("0.");

appendnumber = false;

}

/*

* 判斷button里獲得的數(shù)據(jù)是輸入框的數(shù)據(jù)退一位的情況

*/

else if ("BackSpace".equals(comm)) {

if(jtf.getText()==null||"".equals(jtf.getText()))return;

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

jtf.setText(result+"");

appendnumber = true;

}

}

}

很簡單的東西??！你們?nèi)シ帜敲炊嗲闆r?。∵@個東西啊一個人寫半個小時就OK了，如果你會寫的話，其實初學(xué)者們別因為別人怎么怎么說就嚇倒，其實這寫起來都沒多少代碼的，都是些小東西而已。最重要的是你要搞懂來龍去脈就不難了，別聽一些人吹誰誰牛X這類的，其實你認真的去做，認真的去思考，你也不比他們差。

怎么用java編程，實現(xiàn)分數(shù)的加減乘除運算？

java編程實現(xiàn)分數(shù)的加減乘除運算的步驟如下：

1、打開eclipse，創(chuàng)建一個Java工程，在此工程里新建一個類；

2、在新建的類中，添加4個運算類；

3、在主方法中調(diào)用對應(yīng)的方法即可完成分數(shù)的加減乘除運算了。

具體實現(xiàn)代碼如下：

public?class?Demo?{

public?static?void?main(String[]?args)?{

System.out.println(jia(1,?2));

System.out.println(jian(1,?2));

System.out.println(cheng(1,?2));

System.out.println(chu(1,?2));

}

//加法運算

private?static?float?jia(float?x,float?y)?{

return?x?+?y;

}

//減法運算

private?static?float?jian(float?x,float?y)?{

return?x?-?y;

}

//乘法運算

private?static?float?cheng(float?x,float?y)?{

return?x?*?y;

}

//除法運算

private?static?float?chu(float?x,float?y)?{

return?x?/?y;

}

}

用Java編寫實現(xiàn)加減乘除，界面如下

用Java編寫的實現(xiàn)加減乘除的程序如下

import?java.awt.BorderLayout;

import?java.awt.event.ActionEvent;

import?java.awt.event.ActionListener;

import?javax.swing.JButton;

import?javax.swing.JComboBox;

import?javax.swing.JFrame;

import?javax.swing.JLabel;

import?javax.swing.JOptionPane;

import?javax.swing.JPanel;

import?javax.swing.JTextField;

public?class?Calculator?extends?JFrame?implements?ActionListener{

JLabel?jl1=new?JLabel("第一個數(shù)");

JLabel?jl2=new?JLabel("運算符");

JLabel?jl3=new?JLabel("第二個數(shù)");

JLabel?jl4=new?JLabel("結(jié)果:");

JTextField?jtf1=new?JTextField(8);

JTextField?jtf2=new?JTextField(8);

JTextField?jtf3=new?JTextField(8);

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

JComboBoxString?jcb=new?JComboBoxString(a);

JButton?jb1=new?JButton("計算");

JButton?jb2=new?JButton("退出");

JPanel?jp=new?JPanel();

Calculator(){

setTitle("計算器");

jb1.addActionListener(this);

jb2.addActionListener(this);

jp.setLayout(null);

jl1.setBounds(30,?30,?80,?20);

jl2.setBounds(110,?30,?80,?20);

jl3.setBounds(190,?30,?80,?20);

jtf1.setBounds(30,?60,?70,?20);

jcb.setBounds(110,?60,?70,20);

jtf2.setBounds(190,?60,?70,?20);

jl4.setBounds(80,?110,?40,?20);

jtf3.setBounds(110,?110,?100,?20);

jb1.setBounds(60,?160,?60,?25);

jb2.setBounds(170,?160,?60,?25);

jp.add(jl1);jp.add(jl2);jp.add(jl3);

jp.add(jtf1);jp.add(jcb);jp.add(jtf2);

jp.add(jl4);jp.add(jtf3);

jp.add(jb1);jp.add(jb2);

add(jp,BorderLayout.CENTER);

setSize(300,?300);

setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

setLocationRelativeTo(null);

setVisible(true);

}

public?static?void?main(String[]?args)?{

new?Calculator();

}

@Override

public?void?actionPerformed(ActionEvent?ae)?{

if(ae.getSource()==jb1){

String?c=((String)?jcb.getSelectedItem()).trim();

if(jtf1.getText().trim().equals("")){

JOptionPane.showMessageDialog(this,?"第一個數(shù)不能為空");

jtf1.requestFocus();

return;

}

if(jtf2.getText().trim().equals("")){

JOptionPane.showMessageDialog(this,?"第二個數(shù)不能為空");

jtf2.requestFocus();

return;

}

double?num1=Double.parseDouble(jtf1.getText().trim());

double?num2=Double.parseDouble(jtf2.getText().trim());

double?num3?=?0;

switch(c){

case?"+":num3=num1+num2;break;

case?"-":num3=num1-num2;break;

case?"*":num3=num1*num2;break;

case?"/":

if(num2==0){

JOptionPane.showMessageDialog(this,?"除數(shù)不能為0");

jtf2.requestFocus();

return;

}else{

num3=num1/num2;

break;

}

}

jtf3.setText(String.valueOf(num3));

}

if(ae.getSource()==jb2){

System.exit(0);

}

}

}

運行結(jié)果

java加減乘除運算的程序怎么編啊

//JAVA編程:四則運算(接收用戶輸入的2個操作數(shù)，和運算符)，計算之后，輸出結(jié)果~~~~

import java.util.Scanner;

public class 四則運算 {

public static void main(String[] args) {

Scanner sc = new Scanner(System.in);

System.out.print("請輸入第一個數(shù)字：");

int a = sc.nextInt();

System.out.print("請輸入運算符號：");

String str = sc.next();

char ch = str.charAt(0);

System.out.print("請輸入第二個數(shù)字：");

int b = sc.nextInt();

switch(ch)

{

case '+':

System.out.println(a+"+"+ b + "="+(a+b));

break;

case '-':

System.out.println(a+"-"+ b+ "="+(a-b));

break;

case '*':

System.out.println(a+"*"+ b+ "="+(a*b));

break;

case '/':

if(b==0){

System.out.println("被除數(shù)為零，運算無意義!");

break;

}

else {

System.out.println(a+"/"+ b+ " = "+(a/b));

break;

}

default:

System.out.println("運算符是無意義字符！");

break;

}

}

}

望采納~~~~~~~~