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：

java计算器代码

import java.awt.*;

import java.awt.event.*;

public class lvhaiya{

int tmp,sum,sum1,sum2=1,sum3=1;

String a,b,c,d;String s="";

Frame f=new Frame("计算器");

private String[]name={

"0","1","2","3","4","5","6","7","8","9","+","-","*","/","=","空格"

};

public Button[] button=new Button[name.length];

TextField t=new TextField("",30);

Panel p=new Panel();

Panel p1=new Panel();

Color color=new Color(100,170,90);

public lvhaiya(){

p1.setLayout(new GridLayout(5,5));

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

button[i]=new Button(name[i]);

p1.add(button[i]);

}

p.setLayout(new FlowLayout(FlowLayout.LEFT));

p.setBackground(color);

p.add(t);

f.add(p,BorderLayout.NORTH);

f.add(p1,BorderLayout.SOUTH);

f.pack();

f.setVisible(true);

f.addWindowListener( new WindowClose());

t.setText("0.");

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

button[i].addActionListener(new ButtonEventl());

}

}

public static void main(String[]args){

new lvhaiya();

}

class WindowClose extends WindowAdapter{

public void windouClosing(WindowEvent e){

System.exit(0);

}

}

class ButtonEventl implements ActionListener{

public void actionPerformed(ActionEvent e)throws ArithmeticException{

String command=e.getActionCommand();

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

sum=Integer.parseInt(t.getText())+sum;

t.setText(String.valueOf(sum));

a=t.getText();

s="";

}

else if(command.equals("-")){

sum1=Integer.parseInt(t.getText());

b=t.getText();

s="";

}

else if(command.equals("*")){

sum2=Integer.parseInt(t.getText())*sum2;

t.setText(String.valueOf(sum2));

c=t.getText();

s="";

}

else if(command.equals("/")){

sum3=Integer.parseInt(t.getText());

d=t.getText();

s="";

}

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

if(a!=null){

t.setText(String.valueOf(sum+tmp));

}

if(b!=null){

t.setText(String.valueOf(sum1-tmp));

}

if(c!=null){

t.setText(String.valueOf(sum2*tmp));

}

try{

if(d!=null){

t.setText(String.valueOf(sum3/tmp));

}

}

catch(ArithmeticException a){

t.setText("除数不能为零");

}

}

else if(command.equals("空格")){

sum=0;

a=null;

b=null;

c=null;

d=null;

sum1=0;

sum2=1;

sum3=1;

tmp=0;

t.setText("0");

s="";

}

else{

s=s+command;

t.setText(s);

tmp=Integer.parseInt(s);

}

}

}

}

//按钮可以自己美化一下 希望可以帮到你

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。

求用JAVA实现计算器的代码（可实用的，没语法错误的）

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.JButton; import javax.swing.JFrame; import javax.swing.JOptionPane; import javax.swing.JPanel; import javax.swing.JTextField; import javax.swing.border.TitledBorder; //导包 public class Jisuanqi extends JFrame implements ActionListener { //继承JFrame 实现事件监听 private JTextField reasult; private JButton btn1, btn2, btn3, btn4, btn5, btn6, btn7, btn8, btn9, btn0, btnAC, btnAdd, btnSub, btnReasult, btnD, btnAbout, btnCancel; private boolean add, sub, end, s, c; private String str; private double num1, num2; public Jisuanqi() { //构造属性 JPanel p1 = new JPanel(); JPanel p2 = new JPanel(); JPanel p3 = new JPanel(); TitledBorder tb = new TitledBorder("输出"); tb.setTitleColor(Color.BLUE); //标题边框底端线 设置颜色 btnAbout = new JButton(" 关于 "); btnCancel = new JButton("Cancel"); //两个按钮 btnCancel.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent ee) { System.exit(0); } }); //给Cancel添加事件监听 当鼠标点击时 程序结束 btnAbout.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent ee) { JOptionPane.showMessageDialog(null, "黄盖！！", "消息", JOptionPane.INFORMATION_MESSAGE); } //给“关于”添加事件监听 当鼠标点击时 弹出对话框 显示黄盖 }); p3.add(btnAbout); p3.add(btnCancel); // JPanel p4=new JPanel(); // JPanel p5=new JPanel(); // reasult.setBorder(tb); reasult = new JTextField("0", 20); reasult.setEditable(false); //设置不能修改 reasult.setHorizontalAlignment(JTextField.RIGHT); // 设置文本的水平对齐方式。 reasult.setForeground(Color.BLUE); //颜色 p1.setBorder(tb); p1.add(reasult); btn0 = new JButton("0"); btn0.addActionListener(this); btn1 = new JButton("1"); btn1.addActionListener(this); btn2 = new JButton("2"); btn2.addActionListener(this); btn3 = new JButton("3"); btn3.addActionListener(this); btn4 = new JButton("4"); btn4.addActionListener(this); btn5 = new JButton("5"); btn5.addActionListener(this); btn6 = new JButton("6"); btn6.addActionListener(this); btn7 = new JButton("7"); btn7.addActionListener(this); btn8 = new JButton("8"); btn8.addActionListener(this); btn9 = new JButton("9"); btn9.addActionListener(this); btnD = new JButton("."); btnD.addActionListener(this); btnD.setForeground(Color.RED); btnAC = new JButton("AC"); btnAC.addActionListener(this); btnAC.setBackground(Color.PINK); btnAdd = new JButton("+"); btnAdd.addActionListener(this); btnAdd.setForeground(Color.BLUE); btnSub = new JButton("—"); btnSub.addActionListener(this); btnSub.setForeground(Color.BLUE); btnReasult = new JButton("="); btnReasult.addActionListener(this); btnReasult.setForeground(Color.RED); //事件监听 + 颜色 p2.add(btn1); p2.add(btn2); p2.add(btn3); p2.add(btn4); p2.add(btn5); p2.add(btn6); p2.add(btn7); p2.add(btn8); p2.add(btn9); p2.add(btn0); p2.add(btnD); p2.add(btnAC); p2.add(btnAdd); p2.add(btnSub); p2.add(btnReasult); //面板上添加按钮 p2.setLayout(new GridLayout(5, 3)); //面板上设置对齐方式 add(p1, BorderLayout.NORTH); add(p2, BorderLayout.CENTER); add(p3, BorderLayout.SOUTH); //将p1 p2 p3 面板对象添加到JFrame } public void num(int i) { String s = null; s = String.valueOf(i); if (end) { // 如果数字输入结束，则将文本框置零，重新输入 reasult.setText("0"); end = false; } if ((reasult.getText()).equals("0")) { // 如果文本框的内容为零，则覆盖文本框的内容 reasult.setText(s); } else { // 如果文本框的内容不为零，则在内容后面添加数字 str = reasult.getText() + s; reasult.setText(str); } }/* * * String s=null; * * s=String.valueOf(i); * * str=reasult.getText()+s; * * reasult.setText(str); * * } */ public void actionPerformed(ActionEvent e) { if (e.getSource() == btn1) num(1); else if (e.getSource() == btn2) num(2); else if (e.getSource() == btn3) num(3); else if (e.getSource() == btn4) num(4); else if (e.getSource() == btn5) num(5); else if (e.getSource() == btn6) num(6); else if (e.getSource() == btn7) num(7); else if (e.getSource() == btn8) num(8); else if (e.getSource() == btn9) num(9); else if (e.getSource() == btn0) num(0); else if (e.getSource() == btnAdd) { sign(1); btnD.setEnabled(true); } else if (e.getSource() == btnSub) { sign(2); btnD.setEnabled(true); } else if (e.getSource() == btnAC) { btnD.setEnabled(true); reasult.setText("0"); } else if (e.getSource() == btnD) { str = reasult.getText(); str += "."; reasult.setText(str); btnD.setEnabled(false); } else if (e.getSource() == btnReasult) { btnD.setEnabled(true); num2 = Double.parseDouble(reasult.getText()); if (add) { num1 = num1 + num2; } else if (sub) { num1 = num1 - num2; } reasult.setText(String.valueOf(num1)); end = true; } } public void sign(int s) { if (s == 1) { add = true; sub = false; } else if (s == 2) { add = false; sub = true; } num1 = Double.parseDouble(reasult.getText()); end = true; } //设计计算的过程 public static void main(String[] args) { Jisuanqi j = new Jisuanqi(); j.setTitle("+/-简易计算器"); j.setLocation(500, 280); j.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); //默认关闭可以关闭程序 j.setResizable(false); j.pack(); j.setVisible(true); } } 这个计算机，绝对让你满意

本文标题：java计算器设计代码 java计算器设计代码怎么用
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