计算器小程序java代码 java简单计算器程序代码

一个JAVA小程序,计算器的

text.setEditable(false);// 得写到方法体中去,单独是不能存在的,你看来是写得头晕了哈

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第二个类那样是用不了text.setText();的

没有这个对象,你把它们写到同一个类中去就没问题了。

非要这么写,那你得再写个方法将text对象传递出来在第二个类中获取来使用……

你写得有点儿乱,我也不知道怎么改了!写一个太花时间,我这边给你一个吧!

你说按钮距离那就是你布局没有处理好!建议直接像下面给出的程序那样!也简单

出了问题了不怕,问题越多进步越快哈

有问题你可以加这个群进行提问:5358308,java world!(two)

给你一个计算器程序

//第一个类是GUI,两个类放两文件里去

import javax.swing.*;

import java.awt.Container;

import java.awt.event.*;

public class Calculate_GUI extends JFrame{

private JPanel p1;

private JButton keyButton[]=new JButton[16],signButton,clearButton,deleteButton;

private JTextField outputField;

private Container contentPane;

private boolean firstInput=true;

private Calculate_Model model=new Calculate_Model();

public Calculate_GUI(){

p1=new JPanel();

keyButton[0]=new JButton("1"); //创建各个按钮

keyButton[1]=new JButton("2");

keyButton[2]=new JButton("3");

keyButton[3]=new JButton("/");

keyButton[4]=new JButton("4");

keyButton[5]=new JButton("5");

keyButton[6]=new JButton("6");

keyButton[7]=new JButton("*");

keyButton[8]=new JButton("7");

keyButton[9]=new JButton("8");

keyButton[10]=new JButton("9");

keyButton[11]=new JButton("-");

keyButton[12]=new JButton("0");

keyButton[13]=new JButton(".");

keyButton[14]=new JButton("=");

keyButton[15]=new JButton("+");

clearButton=new JButton("c");

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

deleteButton=new JButton("←");

outputField=new JTextField(); //它允许编辑单行文本

outputField.setText("0");

outputField.setEditable(false); //指示此 TextComponent 是否应该为可编辑的

contentPane=this.getContentPane(); //返回此窗体的 contentPane 对象;

this.setSize(250,250);

p1.setLayout(new java.awt.GridLayout(4,5)); //创建具有4行5列的布局

for(int i=0;ikeyButton.length;i++) //在容器中画上按钮

{

if(i==4) p1.add(deleteButton);

if(i==8) p1.add(clearButton);

if(i==12) p1.add(signButton);

keyButton[i].setFont(new java.awt.Font("Dialog",3,15));//设置字体Dialog字体名,样式,大小

p1.add(keyButton[i]);

}

contentPane.add(outputField,java.awt.BorderLayout.NORTH);

contentPane.add(p1,java.awt.BorderLayout.CENTER);

this.show();

} //用于显示界面

public void registEvent() //注册各个事件

{

this.addWindowListener(new WindowAdapter() //窗口事件,窗口关闭里程序关闭

{

public void windowClosing(WindowEvent we)

{

System.exit(0);

}

});

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

{

keyButton[i].addActionListener(new keyButtonHandler()); //为每一个按钮添加监听器

}

signButton.addActionListener(new ActionListener()

{

public void actionPerformed(ActionEvent ae)

{

outputField.setText(String.valueOf(model.toSign(Double.parseDouble(outputField.getText()))));

}

});

deleteButton.addActionListener(new ActionListener()

{

public void actionPerformed(ActionEvent ae)

{

outputField.setText(model.backSpace(outputField.getText()));

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

firstInput=true;

}

});

clearButton.addActionListener(new ActionListener()

{

public void actionPerformed(ActionEvent ae)

{

firstInput=true;

outputField.setText("0");

model.reset();

}

});

}

class keyButtonHandler implements ActionListener

{

public void actionPerformed(ActionEvent ae)

{

char actionCommand=ae.getActionCommand().charAt(0);

switch(actionCommand)

{

case '1':

case '2':

case '3':

case '4':

case '5':

case '6':

case '7':

case '8':

case '9':

case '0':

case '.':

if(firstInput) //是否为首次输入

{

outputField.setText(String.valueOf(actionCommand));

firstInput=false;

}

else

outputField.setText(outputField.getText()+actionCommand);

break;

case '+':

case '-':

case '*':

case '/':

if(firstInput)

model.setOperate(actionCommand);

else

{

model.setOperateNumber(Double.parseDouble(outputField.getText()));

model.calculating();

model.setOperate(actionCommand);

outputField.setText(String.valueOf(model.getResult()));

firstInput=true;

}

break;

case '=':

if(firstInput)

{

model.calculating();

outputField.setText(String.valueOf(model.getResult()));

}

else

{

model.setOperateNumber(Double.parseDouble(outputField.getText()));

model.calculating();

outputField.setText(String.valueOf(model.getResult()));

firstInput=true;

}

}

}

}

public static void main(String args[])

{

new Calculate_GUI().registEvent();

}

}

/******************************************

*****计算的模块****************************/

public class Calculate_Model

{

private double result;

private double operateNumber;

private char operate;

public Calculate_Model() //构造方法进行初始化

{

result=0; //结果

operateNumber=0; //操作数

operate=' '; //操作符

}

public void setResult(double n) //设置结果,成员变量result是private的

{

result=n;

}

public void setOperate(char o) //设置操作符

{

operate=o;

}

public void setOperateNumber(double n) //设置操作数

{

operateNumber=n;

}

public double getResult() //获取结果

{

return result;

}

public void calculating() //计算过程

{

switch(operate)

{

case ' ':result=operateNumber;break; //分别对操作判断后进行相应操作

case '+':result+=operateNumber;break;

case '-':result-=operateNumber;break;

case '*':result*=operateNumber;break;

case '/':result/=operateNumber;break;

}

}

public void reset() //重设方法

{

result=0;

operateNumber=0;

operate=' ';

}

public double toSign(double n) //正负转化

{

return 0-(n-0);

}

public String backSpace(String n) //对backSpace设置

{

String reResult="0";

try

{

reResult=n.substring(0,n.length()-1); //从第一个开始取前n-1个

Double.parseDouble(reResult); //将其转化为Double型

}

catch(NumberFormatException e)

{

reResult="0";

}

return reResult;

}

}

java 计算器代码

import javax.swing.*;

import javax.swing.border.Border;

import java.awt.*;

import java.awt.event.ActionListener;

import java.awt.event.ActionEvent;

import java.math.BigDecimal;

import java.math.RoundingMode;

import java.util.HashMap;

/**

* 我的计算器。Cheshi 继承于 JFrame,是计算器的界面

c*/

public class Cheshi extends JFrame {

private Border border = BorderFactory.createEmptyBorder(5, 5, 5, 5);

private JTextField textbox = new JTextField("0");

private CalculatorCore core = new CalculatorCore();

private ActionListener listener = new ActionListener() {

public void actionPerformed(ActionEvent e) {

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

String label = b.getText();

String result = core.process(label);

textbox.setText(result);

}

};

public Cheshi(String title) throws HeadlessException {

super(title); // 调用父类构造方法

setupFrame(); // 调整窗体属性

setupControls(); // 创建控件

}

private void setupControls() {

setupDisplayPanel(); // 创建文本面板

setupButtonsPanel(); // 创建按钮面板

}

// 创建按钮面板并添加按钮

private void setupButtonsPanel() {

JPanel panel = new JPanel();

panel.setBorder(border);

panel.setLayout(new GridLayout(4, 5, 3, 3));

createButtons(panel, new String[]{

"7", "8", "9", "+", "C",

"4", "5", "6", "-", "CE",

"1", "2", "3", "*", "", // 空字符串表示这个位置没有按钮

"0", ".", "=", "/", ""

});

this.add(panel, BorderLayout.CENTER);

}

/**

* 在指定的面板上创建按钮

*

* @param panel 要创建按钮的面板

* @param labels 按钮文字

*/

private void createButtons(JPanel panel, String[] labels) {

for (String label : labels) {

// 如果 label 为空,则表示创建一个空面板。否则创建一个按钮。

if (label.equals("")) {

panel.add(new JPanel());

} else {

JButton b = new JButton(label);

b.addActionListener(listener); // 为按钮添加侦听器

panel.add(b);

}

}

}

// 设置显示面板,用一个文本框来作为计算器的显示部分。

private void setupDisplayPanel() {

JPanel panel = new JPanel();

panel.setLayout(new BorderLayout());

panel.setBorder(border);

setupTextbox();

panel.add(textbox, BorderLayout.CENTER);

this.add(panel, BorderLayout.NORTH);

}

// 调整文本框

private void setupTextbox() {

textbox.setHorizontalAlignment(JTextField.RIGHT); // 文本右对齐

textbox.setEditable(false); // 文本框只读

textbox.setBackground(Color.white); // 文本框背景色为白色

}

// 调整窗体

private void setupFrame() {

this.setDefaultCloseOperation(EXIT_ON_CLOSE); // 当窗体关闭时程序结束

this.setLocation(100, 50); // 设置窗体显示在桌面上的位置

this.setSize(300, 200); // 设置窗体大小

this.setResizable(false); // 窗体大小固定

}

// 程序入口

public static void main(String[] args) throws Exception {

UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());

Cheshi frame = new Cheshi("我的计算器");

frame.setVisible(true); // 在桌面上显示窗体

}

}

/**

* 计算器核心逻辑。这个逻辑只能处理 1~2 个数的运算。

*/

class CalculatorCore {

private String displayText = "0"; // 要显示的文本

boolean reset = true;

private BigDecimal number1, number2;

private String operator;

private HashMapString, Operator operators = new HashMapString, Operator();

private HashMapString, Processor processors = new HashMapString, Processor();

CalculatorCore() {

setupOperators();

setupProcessors();

}

// 为每种命令添加处理方式

private void setupProcessors() {

processors.put("[0-9]", new Processor() {

public void calculate(String command) {

numberClicked(command);

}

});

processors.put("\\.", new Processor() {

public void calculate(String command) {

dotClicked();

}

});

processors.put("=", new Processor() {

public void calculate(String command) {

equalsClicked();

}

});

processors.put("[+\\-*/]", new Processor() {

public void calculate(String command) {

operatorClicked(command);

}

});

processors.put("C", new Processor() {

public void calculate(String command) {

clearClicked();

}

});

processors.put("CE", new Processor() {

public void calculate(String command) {

clearErrorClicked();

}

});

}

// 为每种 operator 添加处理方式

private void setupOperators() {

operators.put("+", new Operator() {

public BigDecimal process(BigDecimal number1, BigDecimal number2) {

return number1.add(number2);

}

});

operators.put("-", new Operator() {

public BigDecimal process(BigDecimal number1, BigDecimal number2) {

return number1.subtract(number2);

}

});

operators.put("*", new Operator() {

public BigDecimal process(BigDecimal number1, BigDecimal number2) {

return number1.multiply(number2);

}

});

operators.put("/", new Operator() {

public BigDecimal process(BigDecimal number1, BigDecimal number2) {

return number1.divide(number2, 30, RoundingMode.HALF_UP);

}

});

}

// 根据命令处理。这里的命令实际上就是按钮文本。

public String process(String command) {

for (String pattern : processors.keySet()) {

if (command.matches(pattern)) {

processors.get(pattern).calculate(command);

break;

}

}

return displayText;

}

// 当按下 CE 时

private void clearErrorClicked() {

if (operator == null) {

number1 = null;

} else {

number2 = null;

}

displayText = "0";

reset = true;

}

// 当按下 C 时,将计算器置为初始状态。

private void clearClicked() {

number1 = null;

number2 = null;

operator = null;

displayText = "0";

reset = true;

}

// 当按下 = 时

private void equalsClicked() {

calculateResult();

number1 = null;

number2 = null;

operator = null;

reset = true;

}

// 计算结果

private void calculateResult() {

number2 = new BigDecimal(displayText);

Operator oper = operators.get(operator);

if (oper != null) {

BigDecimal result = oper.process(number1, number2);

displayText = result.toString();

}

}

// 当按下 +-*/ 时(这里也可以扩展成其他中间操作符)

private void operatorClicked(String command) {

if (operator != null) {

calculateResult();

}

number1 = new BigDecimal(displayText);

operator = command;

reset = true;

}

// 当按下 . 时

private void dotClicked() {

if (displayText.indexOf(".") == -1) {

displayText += ".";

} else if (reset) {

displayText = "0.";

}

reset = false;

}

// 当按下 0-9 时

private void numberClicked(String command) {

if (reset) {

displayText = command;

} else {

displayText += command;

}

reset = false;

}

// 运算符处理接口

interface Operator {

BigDecimal process(BigDecimal number1, BigDecimal number2);

}

// 按钮处理接口

interface Processor {

void calculate(String command);

}

}

计算器java代码

import java.awt.Color;

import java.awt.Font;

import java.awt.GridLayout;

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

import javax.swing.JButton;

import javax.swing.JFrame;

import javax.swing.JLabel;

import javax.swing.JPanel;

import javax.swing.JTextField;

import javax.swing.WindowConstants;

import javax.swing.border.LineBorder;

class Normal{

double i,j;

public Normal(double num1,double num2){

i=num1;

j=num2;

}

public double puls(){

return i+j;

}

public double subtract(){

return i-j;

}

public double multiply(){

return i*j;

}

public double divide(){

return i/j;

}

public double surpuls(){

return i%j;

}

}

class scientific extends Normal{

public scientific(int num1, int num2) {

super(num1, num2);

}

}

public class calc extends JFrame{

public static void main(String[] args) {

viewNormal VN= new viewNormal("normal");

}

}

class viewNormal extends JFrame implements ActionListener{

JPanel jp1 = new JPanel(new GridLayout(4,3,5,5));

JPanel jp2 = new JPanel(new GridLayout(5,1,5,5));

JLabel jl;

JButton[] jb;

JButton jbs,jbo,jba,jbb,jbc,jby;

StringBuffer sb = new StringBuffer();

Normal normal;

int dot=0;

double fnum=0;

double lnum=0;

double result;

String sign=null;

public viewNormal(String title){

setTitle(title);

setLayout(null);

setVisible(true);

setBounds(200,200,305,350);

setDefaultCloseOperation(WindowConstants.DISPOSE_ON_CLOSE);

jb= new JButton[12];

for(int i=0;i9;i++){

jb[i]=new JButton(""+(i+1));

jp1.add(jb[i]);

jb[i].addActionListener(this);

}

jb[9]=new JButton(".");

jb[10]=new JButton("0");

jb[11]=new JButton("=");

jb[9].addActionListener(this);

jb[10].addActionListener(this);

jb[11].addActionListener(this);

jp1.add(jb[9]);

jp1.add(jb[10]);

jp1.add(jb[11]);

jp1.setBounds(10, 100, 200, 200);

jbs= new JButton("+");jbo= new JButton("-");jba= new JButton("*");

jbb= new JButton("/");jby= new JButton("%");jbc= new JButton("C");

jbs.addActionListener(this);jbo.addActionListener(this);jba.addActionListener(this);

jbb.addActionListener(this);jby.addActionListener(this);jbc.addActionListener(this);

//jp2.add(jby);

jp2.add(jbs);jp2.add(jbo);jp2.add(jba);jp2.add(jbb);jp2.add(jbc);

jp2.setBounds(215, 100, 70, 200);

jl= new JLabel("0",JLabel.RIGHT);

jl.setFont(new Font("Batang",Font.BOLD, 20));

jl.setBorder(new LineBorder(Color.black,2));

jl.setBackground(Color.white);

jl.setBounds(10, 40, 275, 50);

jl.setOpaque(true);

add(jl);

add(jp1);

add(jp2);

}

//+

public void sum(){

lnum=Double.parseDouble(sb.toString());

normal=new Normal(fnum,lnum);

fnum=normal.puls();

result=fnum;

}

//-

private void sub() {

System.out.println(sb.toString());

lnum=Double.parseDouble(sb.toString());

normal=new Normal(fnum,lnum);

fnum=normal.subtract();

result=fnum;

}

//*

private void mul() {

lnum=Double.parseDouble(sb.toString());

normal=new Normal(fnum,lnum);

fnum=normal.multiply();

result=fnum;

}

// /

private void div() {

lnum=Double.parseDouble(sb.toString());

normal=new Normal(fnum,lnum);

fnum=normal.divide();

result=fnum;

}

//%

private void sur() {

lnum=Double.parseDouble(sb.toString());

normal=new Normal(fnum,lnum);

fnum=normal.surpuls();

result=fnum;

}

// =

private void same(){

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

sum();

}

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

sub();

}

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

mul();

}

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

div();

}

if(sign.equals("%")){

sur();

}

}

//result

public void Result(){

if(result%1!=0)

jl.setText(""+result);

else

{

int i=(int)result;

jl.setText(""+i);

}

}

@Override

public void actionPerformed(ActionEvent e) {

//System.out.println(sb.toString());

// 1~9

for(int i=0;i9;i++){

if(e.getSource()==jb[i]!sb.toString().equals("0")){

sb.append(jb[i].getText());

jl.setText(sb.toString());

}

else if(e.getSource()==jb[i]sb.toString().equals("0")){

int d=sb.length();

sb.delete(0, d);

sb.append(jb[i].getText());

jl.setText(sb.toString());

}

}

// 0

if(e.getSource()==jb[10]!sb.toString().equals("0")){

sb.append(jb[10].getText());

jl.setText(sb.toString());

}

// .

if(e.getSource()==jb[9]dot==0!sb.toString().equals("")){

dot++;

sb.append(jb[9].getText());

jl.setText(sb.toString());

}

// =

if(e.getSource()==jb[11]!sb.toString().equals("")){

same();

Result();

int d=sb.length();

sb.delete(0, d);

dot=0;

}

// +

if(e.getSource()==jbs!sb.toString().equals("")){

if(sign!="+"sign!=null)

same();

else

sum();

sign ="+";

Result();

int d=sb.length();

sb.delete(0, d);

dot=0;

}

//-

if(e.getSource()==jbo!sb.toString().equals("")){

if(fnum==0)

fnum=2*Double.parseDouble(sb.toString());

if(sign!="-"sign!=null)

same();

else

sub();

sign ="-";

Result();

int d=sb.length();

sb.delete(0, d);

dot=0;

}

//*

if(e.getSource()==jba!sb.toString().equals("")){

if(fnum==0)

fnum=1;

if(sign!="*"sign!=null)

same();

else

mul();

sign ="*";

Result();

int d=sb.length();

sb.delete(0, d);

dot=0;

}

// /

if(e.getSource()==jbb!sb.toString().equals("")){

if(fnum==0)

fnum=Math.pow(Double.parseDouble(sb.toString()),2);

if(sign!="/"sign!=null)

same();

else

div();

sign ="/";

Result();

int d=sb.length();

sb.delete(0, d);

dot=0;

}

//%

// if(e.getSource()==jby!sb.toString().equals("")){

// if(fnum==0){

// fnum=Double.parseDouble(sb.toString());

// result=fnum;

// }

// else {

// if(sign!="%"sign!=null)

// same();

// else{

// lnum=Double.parseDouble(sb.toString());

// normal=new Normal(fnum,lnum);

// fnum=normal.surpuls();

// result=fnum;

// }

// }

// sign ="%";

// Result();

// int d=sb.length();

// sb.delete(0, d);

// dot=0;

// }

//clear

if(e.getSource()==jbc){

int d=sb.length();

sb.delete(0, d);

jl.setText("0");

dot=0;

fnum=0;

lnum=0;

sign=null;

}

}

}

class viewScientific extends viewNormal{

public viewScientific(String title){

super(title);

setBounds(200,200,800,500);

}

}

//等号以后输入符号用不了, String转 double 本来就有错误,你可以用我的扩展成科学型的。

求一个java编成的“计算器”小程序

// 我以前写的。。 你看看吧

package 娱乐;

import java.awt.Container;

import java.awt.FlowLayout;

import java.awt.GridLayout;

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

import java.awt.event.MouseMotionListener;

import java.text.DecimalFormat;

import javax.swing.*;

public class 计数器_一般 extends JFrame implements ActionListener {

private JButton an[];

private JButton qingkong;

private JTextField k;

private JPanel rq1, rq2;

private String string[] = { "7", "8", "9", "/", "6", "5", "4", "*", "3",

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

private String s = "", shu1 = "", shu2 = "", shu3 = "";

private static int fo = 0;

private boolean ff = true;

public 计数器_一般() {

Container c = getContentPane();

c.setLayout(new FlowLayout());

// c.setLayout(new GridLayout(2,1));

rq1 = new JPanel();

k = new JTextField(10);

qingkong = new JButton("C");

rq1.add(k);

rq1.add(qingkong);

rq2 = new JPanel();

rq2.setLayout(new GridLayout(4, 4, 3, 3));

an = new JButton[string.length];

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

an[i] = new JButton(string[i]);

an[i].addActionListener(this);

rq2.add(an[i]);

}

c.add(rq1);

c.add(rq2);

qingkong.addActionListener(this);

setSize(190, 200);

setVisible(true);

}

public static void main(String[] args) {

计数器_一般 s = new 计数器_一般();

s.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

}

public void actionPerformed(ActionEvent e) {

if (!(e.getSource() == an[3] || e.getSource() == an[7]

|| e.getSource() == an[11] || e.getSource() == an[13]

|| e.getSource() == an[14] || e.getSource() == an[15] || e

.getSource() == qingkong)) {

if (e.getSource() == an[12]) {

s += e.getActionCommand();

char a = s.charAt(0);

if (a == '0') {

s = "0.";

k.setText(s);

}

} else {

s += e.getActionCommand();

k.setText(s);

ff = true;

}

} else {

if (e.getSource() == qingkong) {

k.setText("");

fo = 0;

shu1 = "";

s = "";

}

if (e.getSource() == an[13]) {

String ss = s;

ss += e.getActionCommand();

char a = ss.charAt(0);

if (a == '.') {

s = "";

} else {

if (ss.matches("[0-9].")) {

s += e.getActionCommand();

k.setText(s);

}

}

}

if (ff) {

ff = false;

if (e.getSource() == an[3]) {

if (k.getText().equals(""))

;

else {

if (shu1.equals("")) {

shu1 = k.getText();

k.setText("/");

s = "";

fo = 3;

} else {

shu2 = k.getText();

jishu(fo, shu1, shu2);

fo = 3;

}

}

}

if (e.getSource() == an[7]) {

if (k.getText().equals(""))

;

else {

if (shu1.equals("")) {

shu1 = k.getText();

k.setText("*");

s = "";

fo = 7;

} else {

shu2 = k.getText();

jishu(fo, shu1, shu2);

fo = 7;

}

}

}

if (e.getSource() == an[11]) {

if (k.getText().equals(""))

;

else {

if (shu1.equals("")) {

shu1 = k.getText();

k.setText("-");

s = "";

fo = 11;

} else {

shu2 = k.getText();

jishu(fo, shu1, shu2);

fo = 11;

}

}

}

if (e.getSource() == an[15]) {

if (k.getText().equals(""))

;

else {

if (shu1.equals("")) {

shu1 = k.getText();

k.setText("+");

s = "";

fo = 15;

} else {

shu2 = k.getText();

jishu(fo, shu1, shu2);

fo = 15;

}

}

}

if (e.getSource() == an[14]) {

if (k.getText().equals("") || shu1.equals(""))

;

else {

shu2 = k.getText();

jishu(fo, shu1, shu2);

}

}

}

}

}

public void jishu(int fj, String s1, String s2) {

DecimalFormat twoDigits = new DecimalFormat("0.00");

double a, b;

a = Double.parseDouble(s1);

b = Double.parseDouble(s2);

switch (fj) {

case 3:

shu3 = twoDigits.format((double) (a / b));

k.setText(shu3);

break;

case 7:

shu3 = twoDigits.format((double) (a * b));

k.setText(shu3);

break;

case 11:

shu3 = twoDigits.format((double) (a - b));

k.setText(shu3);

break;

case 15:

shu3 = twoDigits.format((double) (a + b));

k.setText(shu3);

break;

}

s = "";

shu1 = shu3;

shu2 = "";

}

}


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