java加減乘除英文代碼 java乘除法代碼

求：Java 計(jì)算器加減乘除代碼注釋

public class MyComputer implements ActionListener{

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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(huà)計(jì)算機(jī)界面你想看也可以，

* 不看也行，具體計(jì)算在public void

* actionPerformed(ActionEvent e)

* 里

JFrame frame = new JFrame("我的計(jì)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(hào)時(shí)我們先存儲(chǔ)剛輸入的值

temp1 = jtf.getText();

//然后存儲(chǔ)符號(hào)

op1 = comm;

* 然后可以重新輸入數(shù)據(jù)到輸入框，所以這時(shí)候我們

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

appendnumber = false;

}

* 判斷button里獲得的數(shù)據(jù)是等號(hào)的情況

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

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

* 遇到等號(hào)的時(shí)候，我們?nèi)〕鰟偛疟４娴臄?shù)據(jù)和當(dāng)前輸入的數(shù)據(jù)做運(yùn)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(hào)看是加減乘除的那種運(yùn)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(diǎn)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(fù)號(hào)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;

}

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java加減乘除運(yùn)算的程序怎么編啊

//JAVA編程:四則運(yùn)算(接收用戶輸入的2個(gè)操作數(shù)，和運(yùn)算符)，計(jì)算之后，輸出結(jié)果~~~~

import java.util.Scanner;

public class 四則運(yùn)算 {

public static void main(String[] args) {

Scanner sc = new Scanner(System.in);

System.out.print("請(qǐng)輸入第一個(gè)數(shù)字：");

int a = sc.nextInt();

System.out.print("請(qǐng)輸入運(yùn)算符號(hào)：");

String str = sc.next();

char ch = str.charAt(0);

System.out.print("請(qǐng)輸入第二個(gè)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(yùn)算無(wú)意義!");

break;

}

else {

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

break;

}

default:

System.out.println("運(yùn)算符是無(wú)意義字符！");

break;

}

望采納~~~~~~~~