java計算器代碼講解 java簡單計算器代碼

急求Java計算器代碼注釋?。。。?！

其實(shí)你這種學(xué)習(xí)編程的方法我是極度不推薦的，正確的方法應(yīng)該從基礎(chǔ)開始，你這個程序是用圖形用戶界面來寫的，入門的話最好還是控制臺程序，這樣你可以了解整個程序的流程和語法，如果你沒有C語言的基礎(chǔ)，請找一本講解C語言的書學(xué)習(xí)，然后學(xué)習(xí)好了你再來看JAVA感覺就很簡單了。（絕對原創(chuàng)，請求給分）

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import java.awt.*;

import java.awt.event.*; //導(dǎo)入包，因為后面要用到里面的東西

public class jisuanqi extends WindowAdapter {

Panel p1 = new Panel();

Panel p2 = new Panel();

Panel p3 = new Panel(); //構(gòu)造3個panel對象，這個是個容器，里面可以添加別的組件

TextField txt; // TextField 組件，相當(dāng)于一個文本區(qū)域

private Button[] b = new Button[17]; //看名字就知道是按鈕了吧

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

"3", "*", "清空", "0", "=", "/", "關(guān)閉" };

static int a;

static String s, str;

//入口函數(shù)，相當(dāng)于C里面的MAIN函數(shù)

public static void main(String args[]) {

(new jisuanqi()).frame(); //調(diào)用函數(shù)，java里叫方法

}

//將窗口實(shí)例化，frame是一個窗口，awt包里的。算法方面自己看看就能明白

public void frame() {

Frame fm = new Frame("簡單計算器");

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

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

}

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

p2.add(b[i]);

}

fm.setBounds(300,200,200,200);

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

txt = new TextField(15);

txt.setEditable(false);

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

b[i].addActionListener(new buttonlistener());

}

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

fm.addWindowListener(this);

fm.setBackground(Color.red);

p1.setLayout(new BorderLayout());

p1.add(txt, "Center");

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);

}

//關(guān)閉窗口的方法

public void windowClosing(WindowEvent e) {

System.exit(0);

}

//用這種方法在一個類里面定義另一個類是不好的，應(yīng)該單獨(dú)用以個文件承載，這個類是實(shí)現(xiàn)了ActionListener接口，用于監(jiān)聽按鈕事件。正規(guī)的寫法應(yīng)該是在主類里面實(shí)現(xiàn)這個接口，然后寫一個方法來調(diào)用。

class buttonlistener implements ActionListener {

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() == "清空")

txt.setText("");

}

}

public void jisuan() {

if (s == "+")

a += Integer.parseInt(txt.getText());

else if (s == "-")

a -= Integer.parseInt(txt.getText());

else if (s == "*")

a *= Integer.parseInt(txt.getText());

else if (s == "/")

a /= Integer.parseInt(txt.getText());

else

a = Integer.parseInt(txt.getText());

}

}

}

//關(guān)閉按鈕事件

class close implements ActionListener {

public void actionPerformed(ActionEvent e) {

System.exit(0);

}

}

java 計算器代碼帶括號 求注釋

//引入各種類文件

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;

//定義JsqFrame繼承Frame

class?JsqFrame?extends?Frame?{

double?d1,?d2;??//定義兩個double類型的變量

int?op?=?-1;??//定義兩個int類型的變量

static?TextField?tf;//定義靜態(tài)對象TextField

CalPanelL?p1;??//定義CalPanelL對象

//?Constructor構(gòu)造方法

JsqFrame()?{

//以下設(shè)置屬性

super("計算器");

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());

}

//添加按鈕繼承Button類

class?CalButton?extends?Button?{

CalButton(String?s)?{

//設(shè)置按鈕屬性

super(s);

setBackground(Color.WHITE);?//設(shè)置顏色為白色

}

}

//定義顯示器繼承Panel類

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()?{

//設(shè)置顯示器的屬性

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(".");

//?設(shè)置按鈕

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");

//?加入按鈕

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());

}

}

//定義PressBAdd實(shí)現(xiàn)ActionListener

//大體的意思是按計算機(jī)按鍵的時出發(fā)的時間，設(shè)置按鍵的監(jiān)聽[加號的監(jiān)聽事件]

class?PressBAdd?implements?ActionListener?{

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

try?{

String?d1?=?tf.getText();

op?=?0;

tf.setText(d1?+?"+");

}?catch?(Exception?ee)?{

}

}

}

//定義PressBSub實(shí)現(xiàn)ActionListener

//大體的意思是按計算機(jī)按鍵的時出發(fā)的時間，設(shè)置按鍵的監(jiān)聽[減號的監(jiān)聽事件]

class?PressBSub?implements?ActionListener?{

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

try?{

String?d1?=?tf.getText();

op?=?1;

tf.setText(d1?+?"-");

}?catch?(Exception?ee)?{

}

}

}

//定義PressBMul實(shí)現(xiàn)ActionListener

//大體的意思是按計算機(jī)按鍵的時出發(fā)的時間，設(shè)置按鍵的監(jiān)聽[乘號的監(jiān)聽事件]

class?PressBMul?implements?ActionListener?{

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

try?{

String?d1?=?tf.getText();

op?=?2;

tf.setText(d1?+?"*");

}?catch?(Exception?ee)?{

}

}

}

//定義PressBDiv實(shí)現(xiàn)ActionListener

//大體的意思是按計算機(jī)按鍵的時出發(fā)的時間，設(shè)置按鍵的監(jiān)聽[除號的監(jiān)聽事件]

class?PressBDiv?implements?ActionListener?{

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

try?{

String?d1?=?tf.getText();

op?=?3;

tf.setText(d1?+?"/");

}?catch?(Exception?ee)?{

}

}

}

//定義PressBL實(shí)現(xiàn)ActionListener

//大體的意思是按計算機(jī)按鍵的時出發(fā)的時間，設(shè)置按鍵的監(jiān)聽[向左鍵的監(jiān)聽事件]

class?PressBL?implements?ActionListener?{

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

try?{

String?d1?=?tf.getText();

op?=?3;

tf.setText(d1?+?"(");

}?catch?(Exception?ee)?{

}

}

}

//定義PressBR實(shí)現(xiàn)ActionListener

//大體的意思是按計算機(jī)按鍵的時出發(fā)的時間，設(shè)置按鍵的監(jiān)聽[向右鍵的監(jiān)聽事件]

class?PressBR?implements?ActionListener?{

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

try?{

String?d1?=?tf.getText();

op?=?3;

tf.setText(d1?+?")");

}?catch?(Exception?ee)?{

}

}

}

//定義PressBEqual實(shí)現(xiàn)ActionListener

//大體的意思是按計算機(jī)按鍵的時出發(fā)的時間，設(shè)置按鍵的監(jiān)聽[等號的監(jiān)聽事件]

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)?{

}

}

}

/*

*?批量寫吧

*?以下是按1、2、3等等的監(jiān)聽事件

*?還有清零的等等監(jiān)聽事件

*/

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);

}

}

幫我解釋下java計算器代碼中的除法運(yùn)算謝謝

java中字符串的相等，請不要用==號，應(yīng)該改成s.equals("==")

else

if(s=="退格"){

a=a/10;

}

這個方法不太好，比如我輸入1，再退格，應(yīng)該等于0.1嗎？

JAVA計算器相關(guān)代碼求大神｛詳解｝

我給你找找

package com.bj.calcultor;

import java.awt.Frame;

import java.awt.GridLayout;

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

import java.awt.event.WindowAdapter;

import java.awt.event.WindowEvent;

import javax.swing.JButton;

import javax.swing.JPanel;

import javax.swing.JTextField;

public class Calcultor extends Frame implements ActionListener {

public static void main(String[] args) {//定義主方

new Calcultor();//創(chuàng)建匿名對象，并調(diào)用test()方法;

}

//定義按鈕名稱

String[] arr={"1","2","3","4","5","6","7","8","9","0","+","-","*","/","=","."};

JButton [] button=new JButton[arr.length];

JButton reset = new JButton("CE");

JTextField display = new JTextField(20);

//創(chuàng)建窗口，定義組件

//執(zhí)行窗口事件:關(guān)閉窗口

private class WindowCloser extends WindowAdapter {

public void windowClosing(WindowEvent we) {

System.exit(0);

}

}

public Calcultor(){

super("計算器");//定義標(biāo)題

//定義面板容器，并布局

JPanel jpanel=new JPanel(new GridLayout(4,4));

//添加按鈕，并給按鈕添加名稱

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

button[i]= new JButton(arr[i]);

jpanel.add(button[i]);

}

JPanel panel2 = new JPanel();

panel2.add("Northr", display);

display.setEnabled(false);

panel2.add("East", reset);

this.add("North", panel2);

this.add("Center", jpanel);

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

addWindowListener(new WindowCloser());

setVisible(true);

setSize(400,400);

pack();

button[i].addActionListener(this);

reset.addActionListener(this);

display.addActionListener(this);

}

}

@Override

public void actionPerformed(ActionEvent e) {//定義事件

// TODO Auto-generated method stub

Object target=e.getSource();

String lable=e.getActionCommand();

if(target==reset){

handleReset();

}else if("0123456789.".indexOf(lable)0){

handleNumber(lable);

}else{

hadleOperator(lable);

}

}

boolean isFirstDigit=true;

private void hadleOperator(String key) {

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

number += Double.valueOf(display.getText());

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

number -= Double.valueOf(display.getText());

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

number *= Double.valueOf(display.getText());

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

number /= Double.valueOf(display.getText());

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

number =Double.valueOf(display.getText());

}

display.setText(String.valueOf(number));

operator=key;

isFirstDigit=true;

}

private void handleNumber(String key) {

if(true){

display.setText(key);//把鍵值設(shè)置為文本框內(nèi)容

}else if(key.equals(".") display.getText().indexOf(".")0){

display.setText(display.getText()+".");//把文本框內(nèi)容設(shè)置：display.getText()+"."

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

display.setText(display.getText() + key);//把文本框內(nèi)容設(shè)置：display.getText()+key

isFirstDigit=false;

}

}

private void handleReset() {

display.setText("0");

isFirstDigit=true;

operator="=";

}

String operator="=";

Double number=0.0;

}

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