java代码计算器类似 java计算器代码带注释

求一个仿真计算器，界面于真实计算器类似，功能简单，最好能有按键声音的java计算器代码。

import java.awt.*;

class jisuanqi

{

public static void main(String[] args)

{

Panel p1=new Panel();

Panel p2=new Panel();

Panel p3=new Panel();

Panel p4=new Panel();

Panel p5=new Panel();

Panel p6=new Panel();

TextField tf=new TextField(30);

tf.setEditable(false);

tf.setBackground(Color.WHITE);

p1.setLayout(new BorderLayout(3,3));

p1.add(p2,"North");

p1.add(p3,"Center");

p2.add(tf);

p3.setLayout(new BorderLayout(3,3));

p3.add(p4,"North");

p3.add(p5,"West");

p3.add(p6,"Center");

p4.setLayout(new GridLayout(1,3,3,3));

Button b1=new Button("Backspace");b1.setForeground(Color.red);

Button b2=new Button(" CE ");b2.setForeground(Color.red);

Button b3=new Button(" C ");b3.setForeground(Color.red);

p4.add(b1);

p4.add(b2);

p4.add(b3);

p5.setLayout(new GridLayout(4,1,3,3));

Button b4=new Button(" MC ");b4.setForeground(Color.red);

Button b5=new Button(" MR ");b5.setForeground(Color.red);

Button b6=new Button(" MS ");b6.setForeground(Color.red);

Button b7=new Button(" M+ ");b7.setForeground(Color.red);

p5.add(b4);

p5.add(b5);

p5.add(b6);

p5.add(b7);

p6.setLayout(new GridLayout(4,5,3,3));

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

Button []keys=new Button[KEYS.length];

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

keys[i] = new Button(KEYS[i]);

p6.add(keys[i]);

keys[i].setForeground(Color.blue);

}

//运算符键用红色标示java代码计算器类似，其java代码计算器类似他键用蓝色表示

keys[3].setForeground(Color.red);

keys[8].setForeground(Color.red);

keys[13].setForeground(Color.red);

keys[18].setForeground(Color.red);

keys[19].setForeground(Color.red);

Frame f=new Frame("计算器");

f.setBounds(200,200,250,200);

f.add(p1);

f.setResizable(false);

f.setVisible(true);

System.out.println("Hello World!");

}

}

相关问答

Q1: java编程，用代码实现计算器类（Calculator）

public class Calculator {

private int number1;

private int number2;

public Calculator(int number1, int number2) {

this.number1 = number1;

this.number2 = number2;

}

public double add() {

return number1 + number2;

}

public double subtract() {

return number1 - number2;

}

public double multiple() {

return number1 * number2;

}

public double divide() {

if(number2 == 0) {

return 0;

}

return number1 / number2;

}

}

public class TestCalculator {

public static void main(String[] args) {

Calculator calculator = new Calculator(5, 2);

System.out.println(calculator.add());

System.out.println(calculator.subtract());

System.out.println(calculator.multiple());

System.out.println(calculator.divide());

}

}

Q2: 用java设计并实现类似Windows中的计算器

import javax.swing.*;

import javax.swing.event.*;

import java.awt.*;

import java.awt.event.*;

public class calculator extends JFrame implements ActionListener

{//这里java代码计算器类似我把JFrame写成Framejava代码计算器类似，这个错误找了好久

JFrame frame;

private JButton jia=new JButton("+");

private JButton jian=new JButton("-");

private JButton cheng=new JButton("*");

private JButton chu=new JButton("/");

private JButton qiuyi=new JButton("%");

private JButton deng=new JButton("=");

private JButton fu=new JButton("+/-");

private JButton dian=new JButton(".");

private JButton kai=new JButton("sqrt");

private JButton diao=new JButton("1/x");

private JButton aa=new JButton("A");

private JButton bb=new JButton("B");

private JButton cc=new JButton("C");

private JButton dd=new JButton("D");

private JButton ee=new JButton("E");

private JButton ff=new JButton("F");

private TextField k1=new TextField();

private objConversion convert = new objConversion();

JMenuItem copy,paste,s,t,help,about,me;

JRadioButton sixteen,ten,eight,two;

JButton backspace,ce,c,num0,num1,num2,num3,num4,num5,num6,num7,num8,num9;

Container cp;

JTextField text;

String copycontent="";

boolean clickable=true,clear=true;

int all=0;

double qian;

String fuhao;

int jin=10,first=1;

public calculator()

{

setTitle("计算器－杨彩制作");

setSize(400,300);

setLocation(250,200);

text=new JTextField(25);

// text.setEnabled(false);

text.setText("0.");

text.setHorizontalAlignment(JTextField.RIGHT);//从右到左

JPanel cp1=new JPanel();

JPanel cp2=new JPanel();

JPanel cp3=new JPanel();

cp=getContentPane();

cp.add(cp1,"North");

cp.add(cp2,"Center");

cp.add(cp3,"South");

cp1.setLayout(new GridLayout(1,6));

cp2.setLayout(new GridLayout(2,4));

cp3.setLayout(new GridLayout(6,6));

sixteen=new JRadioButton("十六进制");

sixteen.setVisible(false);

ten=new JRadioButton("十进制",true);

ten.setVisible(false);

eight=new JRadioButton("八进制");

eight.setVisible(false);

two=new JRadioButton("二进制");

two.setVisible(false);

sixteen.addActionListener(this);

ten.addActionListener(this);

eight.addActionListener(this);

two.addActionListener(this);

ButtonGroup btg=new ButtonGroup();

btg.add(sixteen);

btg.add(ten);

btg.add(eight);

btg.add(two);

JTextField t3=new JTextField(25);

cp1.add(text);

// text.setEnabled(false);

text.setEditable(false);

text.setBackground(new Color(255, 255, 255));

cp2.add(sixteen);

cp2.add(ten);

cp2.add(eight);

cp2.add(two);

backspace=new JButton("Backspace");

backspace.setForeground(new Color(255,0,0));

backspace.addActionListener(this);

ce=new JButton("CE");

ce.setForeground(new Color(255,0,0));

ce.addActionListener(this);

c=new JButton("C");

c.setForeground(new Color(255,0,0));

c.addActionListener(this);

k1.setVisible(false);

cp2.add(k1);

cp2.add(backspace);

cp2.add(ce);

cp2.add(c);

num0=new JButton("0");

num1=new JButton("1");

num2=new JButton("2");

num3=new JButton("3");

num4=new JButton("4");

num5=new JButton("5");

num6=new JButton("6");

num7=new JButton("7");

num8=new JButton("8");

num9=new JButton("9");

cp3.add(num7);

num7.addActionListener(this);

cp3.add(num8);

num8.addActionListener(this);

cp3.add(num9);

num9.addActionListener(this);

cp3.add(chu);

chu.setForeground(new Color(255,0,0));

chu.addActionListener(this);

cp3.add(kai);

kai.addActionListener(this);

cp3.add(num4);

num4.addActionListener(this);

cp3.add(num5);

num5.addActionListener(this);

cp3.add(num6);

num6.addActionListener(this);

cp3.add(cheng);

cheng.setForeground(new Color(255,0,0));

cheng.addActionListener(this);

cp3.add(qiuyi);

qiuyi.addActionListener(this);

cp3.add(num1);

num1.addActionListener(this);

cp3.add(num2);

num2.addActionListener(this);

cp3.add(num3);

num3.addActionListener(this);

cp3.add(jian);

jian.setForeground(new Color(255,0,0));

jian.addActionListener(this);

cp3.add(diao);

diao.addActionListener(this);

cp3.add(num0);

num0.addActionListener(this);

cp3.add(fu);

fu.addActionListener(this);

cp3.add(dian);

dian.addActionListener(this);

cp3.add(jia);

jia.setForeground(new Color(255,0,0));

jia.addActionListener(this);

cp3.add(deng);

deng.setForeground(new Color(255,0,0));

deng.addActionListener(this);

cp3.add(aa);

aa.addActionListener(this);

cp3.add(bb);

bb.addActionListener(this);

cp3.add(cc);

cc.addActionListener(this);

cp3.add(dd);

dd.addActionListener(this);

cp3.add(ee);

ee.addActionListener(this);

cp3.add(ff);

ff.addActionListener(this);

aa.setVisible(false);

bb.setVisible(false);

cc.setVisible(false);

dd.setVisible(false);

ee.setVisible(false);

ff.setVisible(false);

JMenuBar mainMenu = new JMenuBar();

setJMenuBar(mainMenu);

JMenu editMenu = new JMenu("编辑");

JMenu viewMenu = new JMenu("查看");

JMenu helpMenu = new JMenu("帮助");

mainMenu.add(editMenu);

mainMenu.add(viewMenu);

mainMenu.add(helpMenu);

copy = new JMenuItem(" 复制");

paste = new JMenuItem(" 粘贴");

KeyStroke copyks=KeyStroke.getKeyStroke(KeyEvent.VK_C,Event.CTRL_MASK);

copy.setAccelerator(copyks);//设置退出菜单选项加上快捷键

KeyStroke pasteks=KeyStroke.getKeyStroke(KeyEvent.VK_V,Event.CTRL_MASK);

paste.setAccelerator(pasteks);//设置退出菜单选项加上快捷键

editMenu.add(copy);

editMenu.add(paste);

copy.addActionListener(this);

paste.addActionListener(this);

t = new JMenuItem("●标准型");

s = new JMenuItem(" 科学型");

viewMenu.add(t);

viewMenu.add(s);

t.addActionListener(this);

s.addActionListener(this);

help = new JMenuItem(" 帮助主题");

about = new JMenuItem(" 关于计算器");

me = new JMenuItem(" 作者主页");

helpMenu.add(help);

helpMenu.add(about);

helpMenu.add(me);

help.addActionListener(this);

about.addActionListener(this);

me.addActionListener(this);

addWindowListener(new WindowDestroyer());//结束窗口

}

public void actionPerformed(ActionEvent e)

{//响应动作代码

if(first==1)

text.setText("");

first=0;//第一次把文本框0.清空

Object temp = e.getSource();

if(temp==copy)

{

copycontent = text.getText();

}

if(temp==paste)

{

text.setText(text.getText()+copycontent);

}

if(temp==t)

{//标准

sixteen.setVisible(false);

ten.setVisible(false);

eight.setVisible(false);

two.setVisible(false);

t.setText("●标准型");

s.setText(" 科学型");

aa.setVisible(false);

bb.setVisible(false);

cc.setVisible(false);

dd.setVisible(false);

ee.setVisible(false);

ff.setVisible(false);

}

if(temp==s)

{//科学

sixteen.setVisible(true);

ten.setVisible(true);

eight.setVisible(true);

two.setVisible(true);

t.setText(" 标准型");

s.setText("●科学型");

aa.setVisible(true);

bb.setVisible(true);

cc.setVisible(true);

dd.setVisible(true);

ee.setVisible(true);

ff.setVisible(true);

aa.setEnabled(false);

bb.setEnabled(false);

cc.setEnabled(false);

dd.setEnabled(false);

ee.setEnabled(false);

ff.setEnabled(false);

}

if(temp==help)

{ //打开系统帮助文件 要查资料

try

{

String filePath = "C:/WINDOWS/Help/calc.chm";

Runtime.getRuntime().exec("cmd.exe /c "+filePath);

}

catch(Exception eeee)

{

System.out.println("打开系统的计算器出错");

}

}

if(temp==about)

{

JOptionPane.showMessageDialog(frame," Java计算器 杨彩 制作 ","关于计算器",JOptionPane.INFORMATION_MESSAGE); ;

}

if(temp==me)

{

try

{

Process p = Runtime.getRuntime().exec("explorer ");

}

catch(Exception eeee)

{

System.out.println("打开指定网页出错");

}

}

try

{

if(temp==sixteen)

{

String hex=text.getText();

int inthex=Integer.parseInt(hex,jin);//先把数变为10进制

text.setText(convert.decHex(inthex)) ;

jin=16;

aa.setEnabled(true);

bb.setEnabled(true);

cc.setEnabled(true);

dd.setEnabled(true);

ee.setEnabled(true);

ff.setEnabled(true);

num2.setEnabled(true);

num3.setEnabled(true);

num4.setEnabled(true);

num5.setEnabled(true);

num6.setEnabled(true);

num7.setEnabled(true);

num8.setEnabled(true);

num9.setEnabled(true);

}

if(temp==eight)

{

String oct =text.getText();

int intoct=Integer.parseInt(oct,jin);

text.setText(convert.decOct(intoct)) ;

jin=8;

aa.setEnabled(false);

bb.setEnabled(false);

cc.setEnabled(false);

dd.setEnabled(false);

ee.setEnabled(false);

ff.setEnabled(false);

num2.setEnabled(true);

num3.setEnabled(true);

num4.setEnabled(true);

num5.setEnabled(true);

num6.setEnabled(true);

num7.setEnabled(true);

num8.setEnabled(false);

num9.setEnabled(false);

}

if(temp==two)

{

String bin=text.getText();

int intbin=Integer.parseInt(bin,jin);

text.setText(convert.decBin(intbin));

jin=2;

aa.setEnabled(false);

bb.setEnabled(false);

cc.setEnabled(false);

dd.setEnabled(false);

ee.setEnabled(false);

ff.setEnabled(false);

num2.setEnabled(false);

num3.setEnabled(false);

num4.setEnabled(false);

num5.setEnabled(false);

num6.setEnabled(false);

num7.setEnabled(false);

num8.setEnabled(false);

num9.setEnabled(false);

}

if(temp==ten)

{

String dec=text.getText();

int intdec=Integer.parseInt(dec,jin);

// text.setText(convert.decDec(intdec)); //本句会把123变成321

text.setText(intdec+"");

jin=10;

aa.setEnabled(false);

bb.setEnabled(false);

cc.setEnabled(false);

dd.setEnabled(false);

ee.setEnabled(false);

ff.setEnabled(false);

num2.setEnabled(true);

num3.setEnabled(true);

num4.setEnabled(true);

num5.setEnabled(true);

num6.setEnabled(true);

num7.setEnabled(true);

num8.setEnabled(true);

num9.setEnabled(true);

}

}

catch(Exception ee)

{

System.out.println("转换出错,可能你没有输入任何字符");

text.setText("转换出错");

clear=false;

}

if(temp==backspace)

{//退格

String s = text.getText();

text.setText("");

for (int i = 0; i s.length() - 1; i++)

{

char a = s.charAt(i);

text.setText(text.getText() + a);

}

}

if (temp==ce)

{

text.setText("0.");

clear=true;

first=1;

}

if (temp==c)

{

text.setText("0."); ;

clear=true;

first=1;

}

if(temp==num0)

{

if(clear==false)//判断是否点击了符号位

text.setText("");

text.setText(text.getText()+"0");

}

if(temp==num1)

{

if(clear==false)

text.setText("");

text.setText(text.getText()+"1");

clear=true;//第二次不在清空（前二句）

}

if(temp==num2)

{

if(clear==false)

text.setText("");

text.setText(text.getText()+"2");

clear=true;

}

if(temp==num3)

{

if(clear==false)

text.setText("");

text.setText(text.getText()+"3");

clear=true;

}

if(temp==num4)

{

if(clear==false)

text.setText("");

text.setText(text.getText()+"4");

clear=true;

}

if(temp==num5)

{

if(clear==false)

text.setText("");

text.setText(text.getText()+"5");

clear=true;

}

if(temp==num6)

{

if(clear==false)

text.setText("");

text.setText(text.getText()+"6");

clear=true;

}

if(temp==num7)

{

if(clear==false)

text.setText("");

text.setText(text.getText()+"7");

clear=true;

}

if(temp==num8)

{

if(clear==false)

text.setText("");

text.setText(text.getText()+"8");

clear=true;

}

if(temp==num9)

{

if(clear==false)

text.setText("");

text.setText(text.getText()+"9");

clear=true;

}

if(temp==aa)

{

text.setText(text.getText()+"A");

}

if(temp==bb)

{

text.setText(text.getText()+"B");

}

if(temp==cc)

{

text.setText(text.getText()+"C");

}

if(temp==dd)

{

text.setText(text.getText()+"D");

}

if(temp==ee)

{

text.setText(text.getText()+"E");

}

if(temp==ff)

{

text.setText(text.getText()+"F");

}

if(temp==dian)

{

clickable=true;

for (int i = 0; i text.getText().length(); i++)

if ('.' == text.getText().charAt(i))

{

clickable=false;

break;

} //第一层判断是否里面含有小数点;

if(clickable==true)//第二坛判断

text.setText(text.getText()+".");

}

try

{

if(temp==jia)

{//加法

qian=Double.parseDouble(text.getText());

fuhao="+";

clear=false;

}

if(temp==jian)

{

qian=Double.parseDouble(text.getText());

fuhao="-";

clear=false;

;

}

if(temp==cheng)

{

qian=Double.parseDouble(text.getText());

fuhao="*";

clear=false;

}

if(temp==chu)

{

qian=Double.parseDouble(text.getText());

fuhao="/";

clear=false;

}

if(temp==deng)

{

double ss=Double.parseDouble(text.getText());

text.setText("");

if(fuhao=="+")

text.setText(qian+ss+"");

if(fuhao=="-")

text.setText(qian-ss+"");

if(fuhao=="*")

text.setText(qian*ss+"");

if(fuhao=="/")

text.setText(qian/ss+"");

clear=false;//要清空前一次的数据

;

}

if(temp==kai)

{

String s = text.getText();

if (s.charAt(0) == '-')

{

text.setText("负数不能开根号");

}

else

text.setText(Double.toString(java.lang.Math.sqrt(Double.parseDouble(text.getText()))));

clear=false;

}

if(temp==diao)

{

if (text.getText().charAt(0) == '0'text.getText().length() == 1)

{

text.setText("除数不能为零");

}

else

{

boolean isDec = true;

int i, j, k;

String s = Double.toString(1 / Double.parseDouble(text.getText()));

for (i = 0; i s.length(); i++)

if (s.charAt(i) == '.')

break;

for (j = i + 1; j s.length(); j++)

if (s.charAt(j) != '0')

{

isDec = false;

break;

}

if (isDec == true)

{

String stemp = "";

for (k = 0; k i; k++)

stemp += s.charAt(k);

text.setText(stemp);

}

else

text.setText(s);

}

clear=false;

}

if(temp==qiuyi)

{

text.setText("0");

clear=false;

}

if (temp == fu)

{ //导师java代码计算器类似，此方法参考书中例子

boolean isNumber = true;

String s = text.getText();

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

if (! (s.charAt(i) = '0' s.charAt(i) = '9' || s.charAt(i) == '.' ||

s.charAt(i) == '-'))

{

isNumber = false;

break;

}

if (isNumber == true)

{

//如果当前字符串首字母有'-'号,代表现在是个负数,再按下时,则将首符号去掉

if (s.charAt(0) == '-')

{

text.setText("");

for (int i = 1; i s.length(); i++)

{

char a = s.charAt(i);

text.setText(text.getText() + a);

}

}

//如果当前字符串第一个字符不是符号，则添加一个符号在首字母处

else

text.setText('-' + s);

}

}

}

catch(Exception eee)

{

System.out.println("运算时,首先输入数字或字符");

text.setText("运算出错");

clear=false;

}

}

class WindowDestroyer extends WindowAdapter

{//退出窗口动作

public void windowClosing(WindowEvent e)

{

System.exit(0);

}

}

class objConversion

{//导师,本进制类参考了CSMD类转换例子

public void objConversion ()

{

}

public String decDec (int decNum)

{//10

String strDecNum = Integer.toString(decNum);

for (int i = strDecNum.length(); i 3; i++)

{

strDecNum = "0" + strDecNum;

}

// return strDecNum;

return invert (strDecNum, 5);

}

public String decHex (int decNum)

{//10 to 16

String strHexNum = "";

int currentNum = 0;

while (decNum != 0)

{

if (decNum 15)

{

currentNum = decNum % 16;

decNum /= 16;

}

else

{

currentNum = decNum;

decNum = 0;

}

switch (currentNum)

{

case 15: strHexNum += "F";

break;

case 14: strHexNum += "E";

break;

case 13: strHexNum += "D";

break;

case 12: strHexNum += "C";

break;

case 11: strHexNum += "B";

break;

case 10: strHexNum += "A";

break;

default: strHexNum += Integer.toString(currentNum);

break;

}

}

return invert (strHexNum, 2);

}

public String decOct (int decNum)

{//10 to 8

String strOctNum = "";

while (decNum != 0)

{

if (decNum 7)

{

strOctNum += Integer.toString(decNum % 8);

decNum /= 8;

}

else

{

strOctNum += Integer.toString(decNum);

decNum = 0;

}

}

return invert (strOctNum, 3);

}

public String decBin (int decNum)

{//10 to 2

String strBinNum = "";

while (decNum != 0)

{

if (decNum 1)

{

strBinNum += Integer.toString(decNum % 2);

decNum /= 2;

}

else

{

strBinNum += Integer.toString(decNum);

decNum = 0;

}

}

return invert (strBinNum, 8);

}

private String invert (String strNum, int minLength) //转换长度

{

String answer = "";

int length = strNum.length();

if (length minLength)

{

for (int padding = (minLength - length); padding 0; padding--)

{

answer += "0";

}

}

for (int i = length; i 0; i--)

{

answer += strNum.charAt (i - 1);

}

return answer;

}

}

public static void main(String arg[])//产生窗口

{

calculator win = new calculator();

win.setVisible(true);

}

}

Q3: 用Java做一个类似于这样的计算器界面(必须有0-9和加减乘除等号，其他随意) 主要要求就是希望下

以前写过的一份，仅供参考：

import java.awt.*;

import java.awt.event.*;

import java.math.BigDecimal;

import javax.swing.*;

//创建计算器Calculator类，实现ActionListener接口

public class Calculater implements ActionListener {

    //定义变量和按钮数组

    private String[] names = {"Backspace","CE","C","+","7","8","9","-",

                              "4","5","6","*","1","2","3","/","0","+/-",".","="

                             };

    private JButton[] buttonArray = new JButton[names.length];

    private boolean append = false;//默认追加为false

    private String operator = "+";//默认运算符为“+”

    private String s1 = "0";//默认字符为0

    private String ss = "0";//默认字符为0

    //创建可以显示20个字符的文本框

    JTextField jtf = new JTextField(20);

    //构造方法

    public Calculater() {}

    public Calculater(String title) {

        //创建窗口、面板，并设置面板布局为网格布局

        JFrame jf = new JFrame(title);

        JPanel jp = new JPanel();

        jp.setLayout(new GridLayout(5,4));

        //依次添加按钮到面板中，并为按钮注册监听器

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

            buttonArray[i] = new JButton(names[i]);

            buttonArray[i].addActionListener(this);

            jp.add(buttonArray[i]);

        }

        //添加文本框到窗体中

        jf.add(jtf,BorderLayout.NORTH);

        jf.add(jp);//添加面板到窗体中

        jtf.setHorizontalAlignment(JTextField.RIGHT);//设置文本框的水平方向为右

        jtf.setText("0");//设置初始文本为0

        jtf.setEditable(false);//设置文本框为不可编辑状态

        //设置窗体属性

        jf.pack();//系统自动设置大小和位置

        jf.setVisible(true);

        jf.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

    }

    //实现监听接口的actionPerformed方法

    public void actionPerformed(ActionEvent e) {

        String comm = e.getActionCommand();

        if(comm.matches("\\d")) { //用正则表达式判断输出的是否是0~9

            if(append) { //如果是，追加显示

                String temp = jtf.getText();

                jtf.setText(temp + comm);

            } else { //如果不是，显示该字符并将追加设置为true

                jtf.setText(comm);

                append = true;

            }

        } else if(comm.equals(".")) { //输入小数点时

            String temp = jtf.getText();

            if(temp.indexOf(".")== -1  append) { //当输入的文本中没有小数点时

                jtf.setText(temp+comm);

                append = true; //输入小数点后继续追加

            } else if(!append) { //当字符串开始时候先输入 " . " 则直接输出" 0. "

                jtf.setText("0"+comm);

                append = true;

            }

        } else if("+-*/".indexOf(comm)!= -1) { //输入加减乘除符号时，

            //以下运算应该注意数据类型，尤其是大数字和浮点数及int数在运算中的区别

            operator = comm;

            s1 = jtf.getText();

            double d3 = Double.parseDouble(s1);

            double d4 = Double.parseDouble(ss);

            BigDecimal bd3 = new BigDecimal(d3+"");

            BigDecimal bd4 = new BigDecimal(d4+"");

            if(operator.equals("+")) { //加法时

                d3 = bd3.add(bd4).doubleValue();

                ss = d3+"";

                jtf.setText(ss);

            } else if(operator.equals("-")) { //减法时

                if(d4 == 0.0) {

                    ss = s1;

                    jtf.setText(ss);

                } else {

                    d3 = bd4.subtract(bd3).doubleValue();

                    ss = d3+"";

                    jtf.setText(ss);

                }

            } else if(operator.equals("*")) { //乘法时

                if(d4 == 0.0) {

                    ss = s1;

                    jtf.setText(ss);

                } else {

                    d3 = bd3.multiply(bd4).doubleValue();

                    ss = d3+"";

                    jtf.setText(ss);

                }

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

                if(d4 == 0.0) {

                    ss = s1;

                    jtf.setText(s1);

                } else {

                    d3 = bd4.divide(bd3,15,BigDecimal.ROUND_HALF_UP).doubleValue();

                }

                ss = d3+"";

                jtf.setText(ss);

            }

            append = false; //不继续追加

        } else if(comm.equals("=")) { //输入等号时，计算加减乘除的结果

            String s2 = jtf.getText();

            double d1 = Double.parseDouble(ss);

            double d2 = Double.parseDouble(s2);

            BigDecimal bd1 = new BigDecimal(d1+"");

            BigDecimal bd2 = new BigDecimal(d2+"");

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

                d1 = bd1.add(bd2).doubleValue();

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

                d1 = bd1.subtract(bd2).doubleValue();

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

                d1 = bd1.multiply(bd2).doubleValue();

            } else if(operator.equals("/")) { //精确计算浮点除法

                if(d2!=0.0) {

                    d1 = bd1.divide(bd2,15,BigDecimal.ROUND_HALF_UP).doubleValue();

                }

            }

            ss = "0";

            jtf.setText(d1+"");

            append = false; //不继续追加

        } else if(comm.equals("CE")||comm.equals("C")) { //输入CE或C时

            jtf.setText("0");

            ss = "0";

            append = false;

        } else if(comm.equals("+/-")) { //改变数值的正负号

            String temp = jtf.getText();

            if(!append) {

                jtf.setText("-");

                append = true;

            } else if(temp.startsWith("-")) { //如果字符串以负号开头

                jtf.setText(temp.substring(1));

            } else {

                jtf.setText("-" + temp);

            }

        } else if(comm.equals("Backspace")) { //输入Backspace时，退回一个字符

            String temp = jtf.getText();

            if(temp.length()0)

                jtf.setText(temp.substring(0,temp.length()-1));

        }

    }

    //主方法

    public static void main(String[] args) {

        //创建名为Calculator的计算器对象

        new Calculater("计算器");

    }

}

运行效果：

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