java编程计算器代码（java编程计算器代码大全）

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本文目录一览：

• 1、JAVA简单咋做，计算器代码
• 2、java计算器代码
• 3、用JAVA编写的科学计算器源代码

JAVA简单咋做，计算器代码

简单写了下，代码如下请参照：

/**

 * 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

用JAVA编写的科学计算器源代码

import java.awt.*;

import javax.swing.*;

import java.awt.event.*;

class Counter extends WindowAdapter

{

static JFrame f=new JFrame("计算器");

static JTextField text1=new JTextField("0.");

static String source="";

static String cal="";

static String object="";

static boolean flag=false;

static boolean flag1=true;

static boolean flag2=false;

public void init()

{

try

{

Container c=f.getContentPane();

JPanel pan1=new JPanel();

JButton b1=new JButton("1");

JButton b2=new JButton("2");

JButton b3=new JButton("3");

JButton b4=new JButton("4");

JButton b5=new JButton("5");

JButton b6=new JButton("6");

JButton b7=new JButton("7");

JButton b8=new JButton("8");

JButton b9=new JButton("9");

JButton b0=new JButton("0");

JButton b11=new JButton("+");

JButton b12=new JButton("-");

JButton b13=new JButton("*");

JButton b14=new JButton("/");

JButton b15=new JButton(".");

JButton b16=new JButton("=");

JButton bclar=new JButton("清零");

text1.setHorizontalAlignment(JTextField.RIGHT);

c.add(text1,"North");

c.add(pan1);

A aa=new A();

Result re=new Result();

Opertion op=new Opertion();

Clar cl=new Clar();

b1.addActionListener(aa);

b2.addActionListener(aa);

b3.addActionListener(aa);

b4.addActionListener(aa);

b5.addActionListener(aa);

b6.addActionListener(aa);

b7.addActionListener(aa);

b8.addActionListener(aa);

b9.addActionListener(aa);

b0.addActionListener(aa);

b11.addActionListener(op);

b12.addActionListener(op);

b13.addActionListener(op);

b14.addActionListener(op);

b16.addActionListener(re);

b15.addActionListener(aa);

bclar.addActionListener(cl);

pan1.add(b1);

pan1.add(b2);

pan1.add(b3);

pan1.add(b11);

pan1.add(b4);

pan1.add(b5);

pan1.add(b6);

pan1.add(b12);

pan1.add(b7);

pan1.add(b8);

pan1.add(b9);

pan1.add(b13);

pan1.add(b0);

pan1.add(b15);

pan1.add(b16);

pan1.add(b14);

pan1.add(bclar);

f.setSize(200,220);

f.setVisible(true);

}

catch(Exception e)

{

System.out.println(e.getMessage());

}

}

class A implements ActionListener

{

public void actionPerformed(ActionEvent e)

{

String a=text1.getText();

String s=e.getActionCommand();

if(a.equals("0.")||a.equals("+")||a.equals("-")||a.equals("*")||a.equals("/"))

text1.setText(s);

else {

if(flag2)

{

text1.setText(s);

flag2=false;

}

else

text1.setText(a+s);

}

}

}

class Opertion implements ActionListener

{

public void actionPerformed(ActionEvent e)

{

cal=e.getActionCommand();

if(flag1==true)

source=text1.getText();

text1.setText(cal);

flag1=false;

flag=true;

}

}

class Result implements ActionListener

{

public void actionPerformed(ActionEvent e)

{

double num1;

num1=Double.parseDouble(source);

object=text1.getText();

double num2;

num2=Double.parseDouble(object);

double result=0;

if(cal.equals("+"))

result=num1+num2;

if(cal.equals("-"))

result=num1-num2;

if(cal.equals("*"))

result=num1*num2;

if(cal.equals("/"))

if(num2==0)

text1.setText("除数不能为0");

else

result=num1/num2;

String s1=Double.toString(result);

text1.setText(s1);

flag1=true;

flag2=true;

}

}

class Clar implements ActionListener

{

public void actionPerformed(ActionEvent e)

{

text1.setText("0.");

}

}

public static void main(String[] args)

{

Counter count=new Counter();

count.init();

}

public void windowClosing(WindowEvent e){

System.exit(1);

}

public void windowOpened(WindowEvent e){}

public void windowIconified(WindowEvent e){}

public void windowDeiconified(WindowEvent e){}

public void windowClosed(WindowEvent e){}

public void windowActivated(WindowEvent e){}

public void windowDeactivated(WindowEvent e){}

}

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