java计算器加减代码 java加法计算器代码

用java写个简单的加减计算器

不仅可以加减还可以乘除，代码如下：

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package 计算器;

import java.awt.BorderLayout;

import java.awt.Container;

import java.awt.GridLayout;

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

import java.util.regex.Matcher;

import java.util.regex.Pattern;

import javax.swing.JButton;

import javax.swing.JFrame;

import javax.swing.JOptionPane;

import javax.swing.JPanel;

import javax.swing.JTextField;

public class Calculator extends JFrame implements ActionListener {

boolean flag = false;

JTextField jtf = new JTextField();

public static void main(String[] args) {

new Calculator();

}

public Calculator() {

setSize(300, 300);

setTitle("计算器");

Container c = getContentPane();

jtf.setHorizontalAlignment(JTextField.RIGHT);

JButton jb = new JButton("=");

jb.addActionListener(this);

JPanel jp = new JPanel();

c.add(jtf, BorderLayout.NORTH);

c.add(jp, BorderLayout.CENTER);

c.add(jb, BorderLayout.SOUTH);

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

addButton(jp);

setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

setResizable(false);

setVisible(true);

}

public void addButton(JPanel jp) {

JButton b = null;

b = new JButton("1");

b.addActionListener(this);

jp.add(b);

b = new JButton("2");

b.addActionListener(this);

jp.add(b);

b = new JButton("3");

b.addActionListener(this);

jp.add(b);

b = new JButton("+");

b.addActionListener(this);

jp.add(b);

b = new JButton("4");

b.addActionListener(this);

jp.add(b);

b = new JButton("5");

b.addActionListener(this);

jp.add(b);

b = new JButton("6");

b.addActionListener(this);

jp.add(b);

b = new JButton("-");

b.addActionListener(this);

jp.add(b);

b = new JButton("7");

b.addActionListener(this);

jp.add(b);

b = new JButton("8");

b.addActionListener(this);

jp.add(b);

b = new JButton("9");

b.addActionListener(this);

jp.add(b);

b = new JButton("*");

b.addActionListener(this);

jp.add(b);

b = new JButton("0");

b.addActionListener(this);

jp.add(b);

b = new JButton(".");

b.addActionListener(this);

jp.add(b);

b = new JButton("C");

b.addActionListener(this);

jp.add(b);

b = new JButton("/");

b.addActionListener(this);

jp.add(b);

}

public void actionPerformed(ActionEvent e) {

if (e.getActionCommand() == "=") {

if (jtf.getText().matches("\\d+\\.?\\d*[\\+\\-\\*\\/]\\d+\\.?\\d*")) {

String s = jtf.getText();

Pattern p = Pattern.compile("\\d+\\.?\\d*");

Matcher m = p.matcher(s);

m.find();

double firstNum = Double.parseDouble(m.group());

m.find();

double secondNum = Double.parseDouble(m.group());

if (jtf.getText().matches("\\d+\\.?\\d*\\+\\d+\\.?\\d*")) {

jtf.setText("" + (firstNum + secondNum));

} else if (jtf.getText().matches("\\d+\\.?\\d*\\-\\d+\\.?\\d*")) {

jtf.setText("" + (firstNum - secondNum));

} else if (jtf.getText().matches("\\d+\\.?\\d*\\*\\d+\\.?\\d*")) {

jtf.setText("" + (firstNum * secondNum));

} else if (jtf.getText().matches("\\d+\\.?\\d*\\/\\d+\\.?\\d*")) {

jtf.setText("" + (firstNum / secondNum));

}

} else {

JOptionPane.showMessageDialog(null, "请输入正确表达式！");

}

flag = true;

} else if (e.getActionCommand() == "C") {

jtf.setText("");

} else {

if (flag) {

if (e.getActionCommand() != "+" e.getActionCommand() != "-"

e.getActionCommand() != "*"

e.getActionCommand() != "/") {

//System.out.println(e.getActionCommand() != "+");

jtf.setText("");

}

flag = false;

}

jtf.setText(jtf.getText() + e.getActionCommand());

}

如何使用Java对象语言编写一个加减乘除计算器要有代码

下面文件名要为：JiSuanQi.java

import java.awt.*;

import java.awt.event.*;

public class JiSuanQi

{

String s="",s1=null,s2=null;

Frame f=new Frame("计算器");

TextField tf=new TextField(30);

Panel p1=new Panel();

Panel p2=new Panel();

Panel p3=new Panel();

Button bt1=new Button("=");

Button bt2=new Button("删除");

Button[] bt=new Button[16];

int id=0;

public static void main(String[] args)

{

new JiSuanQi().init();

}

public void init()

{

f.setBackground(new Color(85,247,253));

f.setLayout(new BorderLayout(4,4));

p2.setLayout(new GridLayout(4,4,4,4));

p3.setLayout(new BorderLayout(4,4));

f.setResizable(false);

f.add(p1,BorderLayout.NORTH);

f.add(p2);

p3.add(bt2,BorderLayout.NORTH);

p3.add(bt1);

p1.add(tf);

f.add(p3,BorderLayout.EAST);

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

for(int i=0;i16;i++)

{

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

p2.add(bt[i]);

}

bt[0].setForeground(Color.blue);

bt[1].setForeground(Color.blue);

bt[2].setForeground(Color.blue);

bt[4].setForeground(Color.blue);

bt[5].setForeground(Color.blue);

bt[6].setForeground(Color.blue);

bt[8].setForeground(Color.blue);

bt[9].setForeground(Color.blue);

bt[10].setForeground(Color.blue);

bt[12].setForeground(Color.blue);

bt[13].setForeground(Color.blue);

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

bt[7].setForeground(Color.red);

bt[11].setForeground(Color.red);

bt[15].setForeground(Color.red);

bt[14].setForeground(Color.red);

bt1.setForeground(Color.red);

bt2.setForeground(Color.red);

f.pack();

f.setVisible(true);

f.addWindowListener(new WindowAdapter()

{

public void windowClosing(WindowEvent e)

{

System.exit(0);

}

);

bt[0].addActionListener(new ActionListener()

{

public void actionPerformed(ActionEvent e)

{

s+=1;

s2+=1;

tf.setText(s);

}

);

bt[1].addActionListener(new ActionListener()

{

public void actionPerformed(ActionEvent e)

{

s+=2;

s2+=2;

tf.setText(s);

}

);

bt[2].addActionListener(new ActionListener()

{

public void actionPerformed(ActionEvent e)

{

s+=3;

s2+=3;

tf.setText(s);

}

);

bt[4].addActionListener(new ActionListener()

{

public void actionPerformed(ActionEvent e)

{

s+=4;

s2+=4;

tf.setText(s);

}

);

bt[5].addActionListener(new ActionListener()

{

public void actionPerformed(ActionEvent e)

{

s+=5;

s2+=5;

tf.setText(s);

}

);

bt[6].addActionListener(new ActionListener()

{

public void actionPerformed(ActionEvent e)

{

s+=6;

s2+=6;

tf.setText(s);

}

);

bt[8].addActionListener(new ActionListener()

{

public void actionPerformed(ActionEvent e)

{

s+=7;

s2+=7;

tf.setText(s);

}

);

bt[9].addActionListener(new ActionListener()

{

public void actionPerformed(ActionEvent e)

{

s+=8;

s2+=8;

tf.setText(s);

}

);

bt[10].addActionListener(new ActionListener()

{

public void actionPerformed(ActionEvent e)

{

s+=9;

s2+=9;

tf.setText(s);

}

);

bt[12].addActionListener(new ActionListener()

{

public void actionPerformed(ActionEvent e)

{

s+=0;

s2+=0;

tf.setText(s);

}

);

bt[13].addActionListener(new ActionListener()

{

public void actionPerformed(ActionEvent e)

{

s+='.';

s2+='.';

tf.setText(s);

}

);

bt[3].addActionListener(new ActionListener()

{

public void actionPerformed(ActionEvent e)

{

s1=s;

s+='+';

id=1;

s2="";

tf.setText(s);

}

);

bt[7].addActionListener(new ActionListener()

{

public void actionPerformed(ActionEvent e)

{

s1=s;

s+='-';

id=2;

s2="";

tf.setText(s);

}

);

bt[11].addActionListener(new ActionListener()

{

public void actionPerformed(ActionEvent e)

{

s1=s;

s+='*';

id=3;

s2="";

tf.setText(s);

}

);

bt[14].addActionListener(new ActionListener()

{

public void actionPerformed(ActionEvent e)

{

s="";

s2="";

tf.setText(s);

}

);

bt[15].addActionListener(new ActionListener()

{

public void actionPerformed(ActionEvent e)

{

s1=s;

s+='/';

id=4;

s2="";

tf.setText(s);

}

);

bt1.addActionListener(new ActionListener()

{

public void actionPerformed(ActionEvent e)

{

if(id1) ;

else{

s+='=';

double a=Double.parseDouble(s1);

double b=Double.parseDouble(s2);

double c=0;

switch(id)

{

case 1:c=a+b; break;

case 2:c=a-b; break;

case 3:c=a*b; break;

case 4:c=a/b; break;

}

s+=c;

tf.setText(s);

}

s="";s1="";s2="";id=0;

}

);

bt2.addActionListener(new ActionListener()

{

public void actionPerformed(ActionEvent e)

{

char[] c1;

char[] c2=new char[s.length()-1];

c1=s.toCharArray();

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

c2[i]=c1[i];

s=s.valueOf(c2);

if(id1)

{

s1=s;

}

if(s2.length()=1)

{

char[] c3;

char[] c4=new char[s2.length()-1];

c3=s2.toCharArray();

for(int i=0;is2.length()-1;i++)

c4[i]=c3[i];

s2=s2.valueOf(c4);

}

tf.setText(s);

}

);

}

帮忙用java补齐制作计算器加减乘除等于小数点这几个运算符的代码

import java.awt.*;

import java.awt.event.*;

import javax.swing.*;

import javax.swing.border.*;

import java.util.LinkedList; //工具包

import java.text.NumberFormat; //文本包

/**

* java swing计算器

* @author young

public class Calculator extends Frame implements ActionListener // 计算器类

{

JTextField result;

NumberButton numberButton[];

OperatorButton operatorButton[];

Button radixpoint, positiveminus, backspace, reciprocal, equal, clear; // 声明成员变量

// 小数点按钮,正负号按钮,退格按钮,求倒数按钮,等号按钮,清零按钮

Panel panel;

String operator[] = { "+", "-", "*", "/" };

LinkedList linklist;

boolean pressequal = false;

public Calculator() // 构造方法

{

super("计算器");

linklist = new LinkedList();

numberButton = new NumberButton[10];

for (int i = 0; i = 9; i++) {

numberButton[i] = new NumberButton(i);

numberButton[i].addActionListener(this);

}

operatorButton = new OperatorButton[4];

for (int i = 0; i 4; i++) {

operatorButton[i] = new OperatorButton(operator[i]);

operatorButton[i].addActionListener(this);

}

radixpoint = new Button(".");

positiveminus = new Button("+/-");

backspace = new Button("CE");

reciprocal = new Button("1/x");

equal = new Button("=");

clear = new Button("C");

radixpoint.setForeground(Color.red);

positiveminus.setForeground(Color.red);

backspace.setForeground(Color.red);

reciprocal.setForeground(Color.red);

equal.setForeground(Color.red);

clear.setForeground(Color.red);

radixpoint.addActionListener(this);

positiveminus.addActionListener(this);

backspace.addActionListener(this);

reciprocal.addActionListener(this);

equal.addActionListener(this);

clear.addActionListener(this);

result = new JTextField(10);

result.setHorizontalAlignment(JTextField.RIGHT);

result.setForeground(Color.black);

result.setBackground(Color.white);

result.setFont(new Font("TimesRoman", Font.PLAIN, 14));

result.setBorder(new SoftBevelBorder(BevelBorder.LOWERED));

result.setEditable(false);

panel = new Panel();

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

panel.add(numberButton[1]);

panel.add(numberButton[2]);

panel.add(numberButton[3]);

panel.add(backspace);

panel.add(clear);

panel.add(numberButton[4]);

panel.add(numberButton[5]);

panel.add(numberButton[6]);

panel.add(operatorButton[0]);

panel.add(operatorButton[2]);

panel.add(numberButton[7]);

panel.add(numberButton[8]);

panel.add(numberButton[9]);

panel.add(operatorButton[1]);

panel.add(operatorButton[3]);

panel.add(numberButton[0]);

panel.add(positiveminus);

panel.add(reciprocal);

panel.add(radixpoint);

panel.add(equal);

add(result, "North");

add(panel, "Center");

addWindowListener(new WindowAdapter() {

public void windowClosing(WindowEvent e) {

System.exit(0);

}

});

setSize(270, 200);

setLocation(300, 230);

setVisible(true);

}

public void actionPerformed(ActionEvent e) // 按钮的单击事件处理方法

{

if (e.getSource() instanceof NumberButton) // 数字按钮

{

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

if (linklist.size() == 0) {

int number = b.getNumber();

linklist.add("" + number);

result.setText("" + number);

pressequal = false;

}

else if (linklist.size() == 1 pressequal == false) {

int number = b.getNumber();

String num = (String) linklist.getFirst();

String s = num.concat("" + number);

linklist.set(0, s);

result.setText(s);

} else if (linklist.size() == 1 pressequal == true) {

int number = b.getNumber();

linklist.removeFirst();

linklist.add("" + number);

pressequal = false;

result.setText("" + number);

} else if (linklist.size() == 2) {

int number = b.getNumber();

linklist.add("" + number);

result.setText("" + number);

} else if (linklist.size() == 3) {

int number = b.getNumber();

String num = (String) linklist.getLast();

String s = num.concat("" + number);

linklist.set(2, s);

result.setText(s);

}

} else if (e.getSource() instanceof OperatorButton) // 操作按钮

{

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

if (linklist.size() == 1) {

String fuhao = b.getOperator();

linklist.add(fuhao);

} else if (linklist.size() == 2) {

String fuhao = b.getOperator();

linklist.set(1, fuhao);

} else if (linklist.size() == 3) {

String fuhao = b.getOperator();

String number1 = (String) linklist.getFirst();

String number2 = (String) linklist.getLast();

String operator = (String) linklist.get(1);

try {

double n1 = Double.parseDouble(number1);

double n2 = Double.parseDouble(number2);

double n = 0;

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

n = n1 + n2;

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

n = n1 - n2;

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

n = n1 * n2;

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

n = n1 / n2;

}

linklist.clear();

linklist.add("" + n);

linklist.add(fuhao);

result.setText("" + n);

} catch (Exception ee) {

}

} else if (e.getSource() == equal) // 等号按钮

{

pressequal = true;

if (linklist.size() == 1 || linklist.size() == 2) {

String num = (String) linklist.getFirst();

result.setText("" + num);

} else if (linklist.size() == 3) {

String number1 = (String) linklist.getFirst();

String number2 = (String) linklist.getLast();

String operator = (String) linklist.get(1);

try {

double n1 = Double.parseDouble(number1);

double n2 = Double.parseDouble(number2);

double n = 0;

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

n = n1 + n2;

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

n = n1 - n2;

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

n = n1 * n2;

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

n = n1 / n2;

}

result.setText("" + n);

linklist.set(0, "" + n);

linklist.removeLast();

} catch (Exception ee) {

}

} else if (e.getSource() == radixpoint) // 小数点按钮

{

if (linklist.size() == 0) {

pressequal = false;

} else if (linklist.size() == 1) {

String dot = radixpoint.getLabel();

String num = (String) linklist.getFirst();

String s = null;

if (num.indexOf(dot) == -1) {

s = num.concat(dot);

linklist.set(0, s);

} else {

s = num;

}

linklist.set(0, s);

result.setText(s);

}

else if (linklist.size() == 3) {

String dot = radixpoint.getLabel();

String num = (String) linklist.getLast();

String s = null;

if (num.indexOf(dot) == -1) {

s = num.concat(dot);

linklist.set(2, s);

} else {

s = num;

}

result.setText(s);

}

} else if (e.getSource() == backspace) // 退格按钮

{

if (linklist.size() == 1) {

String num = (String) linklist.getFirst();

if (num.length() = 1) {

num = num.substring(0, num.length() - 1);

linklist.set(0, num);

result.setText(num);

} else {

linklist.removeLast();

result.setText("0");

}

} else if (linklist.size() == 3) {

String num = (String) linklist.getLast();

if (num.length() = 1) {

num = num.substring(0, num.length() - 1);

linklist.set(2, num);

result.setText(num);

} else {

linklist.removeLast();

result.setText("0");

}

} else if (e.getSource() == positiveminus) // 正负号按钮

{

if (linklist.size() == 1) {

String number1 = (String) linklist.getFirst();

try {

double d = Double.parseDouble(number1);

d = -1 * d;

String str = String.valueOf(d);

linklist.set(0, str);

result.setText(str);

} catch (Exception ee) {

}

} else if (linklist.size() == 3) {

String number2 = (String) linklist.getLast();

try {

double d = Double.parseDouble(number2);

d = -1 * d;

String str = String.valueOf(d);

linklist.set(2, str);

result.setText(str);

} catch (Exception ee) {

}

} else if (e.getSource() == reciprocal) // 求倒数按钮

{

if (linklist.size() == 1 || linklist.size() == 2) {

String number1 = (String) linklist.getFirst();

try {

double d = Double.parseDouble(number1);

d = 1.0 / d;

String str = String.valueOf(d);

linklist.set(0, str);

result.setText(str);

} catch (Exception ee) {

}

} else if (linklist.size() == 3) {

String number2 = (String) linklist.getLast();

try {

double d = Double.parseDouble(number2);

d = 1.0 / d;

String str = String.valueOf(d);

linklist.set(0, str);

result.setText(str);

} catch (Exception ee) {

}

} else if (e.getSource() == clear) // 清零按钮

{

pressequal = false;

result.setText("0");

linklist.clear();

}

public static void main(String args[]) {

new Calculator();

}

class NumberButton extends Button // 数字按钮类

{

int number;

public NumberButton(int number) // 构造方法

{

super("" + number);

this.number = number;

setForeground(Color.blue);

}

public int getNumber() {

return number;

}

class OperatorButton extends Button // 运算符号按钮类

{

String operator;

public OperatorButton(String operator) // 构造方法

{

super(operator);

this.operator = operator;

setForeground(Color.red);

}

public String getOperator() {

return operator;

}

求一个JAVA简单计算器的代码，100以内加减的，不要小数点，不要乘除

导包：import java.util.Scanner;

public static void main(String[] args) {

Scanner input=new Scanner(System.in);

System.out.println("请输入第一个数字：");

int one=input.nextInt();

System.out.println("请输入符号：");

String fuhao=input.next();

System.out.println("请输入第二个数字：");

int two=input.nextInt();

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

System.out.println("结果："+(one+two));

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

System.out.println("结果："+(one-two));

}

java 写的计算器源代码只实现加减乘除四则运算即可

import java.awt.*;

import java.awt.event.*;

import javax.swing.*;

import java.util.Vector;

public class calculator

{

String str1="0"; //运算数1 初值一定为0 为了程序的安全

String str2="0"; //运算数2

String fh="+"; //运算符

String jg="";//结果

//状态开关重要

int k1=1;//开关1 用于选择输入方向将要写入str2或 str2

int k2=1;//开关2 符号键次数 k21说明进行的是2+3-9+8 这样的多符号运算

int k3=1;//开关3 str1 是否可以被清0 ==1时可以 !=1时不能被清0

int k4=1;//开关4 str2 同上

int k5=1;//开关5 控制小数点可否被录入 ==1时可以 !=1 输入的小数点被丢掉

JButton jicunqi; //寄存器记录是否连续按下符号键

Vector vt=new Vector(20,10);

JFrame frame=new JFrame("sunshine---计算器");

JTextField jg_TextField=new JTextField(jg,20);//20列

JButton clear_Button=new JButton("清除");

JButton button0=new JButton("0");

JButton button1=new JButton("1");

JButton button2=new JButton("2");

JButton button3=new JButton("3");

JButton button4=new JButton("4");

JButton button5=new JButton("5");

JButton button6=new JButton("6");

JButton button7=new JButton("7");

JButton button8=new JButton("8");

JButton button9=new JButton("9");

JButton button_Dian=new JButton(".");

JButton button_jia=new JButton("+");

JButton button_jian=new JButton("-");

JButton button_cheng=new JButton("*");

JButton button_chu=new JButton("/");

JButton button_dy=new JButton("=");

public static void main(String[] args)

{

calculator calculator=new calculator();

}

calculator()

{

jg_TextField.setHorizontalAlignment(JTextField.RIGHT );//文本框右对齐

JPanel pan=new JPanel();

pan.setLayout(new GridLayout(4,4,5,5));//四行四列边距为5像素

pan.add(button7);

pan.add(button8);

pan.add(button9);

pan.add(button_chu);

pan.add(button4);

pan.add(button5);

pan.add(button6);

pan.add(button_cheng);

pan.add(button1);

pan.add(button2);

pan.add(button3);

pan.add(button_jian);

pan.add(button0);

pan.add(button_Dian);

pan.add(button_dy);

pan.add(button_jia);

pan.setBorder(BorderFactory.createEmptyBorder(5,5,5,5));//pan对象的边距

JPanel pan2=new JPanel();

pan2.add(jg_TextField);

JPanel pan3=new JPanel(); //为什么要多此一句呢？因为我不会设置按钮的大小

pan3.setLayout(new FlowLayout());

pan3.add(clear_Button);

//clear_Button.setSize(10,10);//设置清零按钮的大小吗的不好使！！

frame.setLocation(300, 200); //主窗口出现在位置

frame.setResizable(false); //不能调大小

frame.getContentPane().setLayout(new BorderLayout());

frame.getContentPane().add(pan2,BorderLayout.NORTH);

frame.getContentPane().add(pan,BorderLayout.CENTER);

frame.getContentPane().add(pan3,BorderLayout.SOUTH);

frame.pack();

frame.setVisible(true);

//以上是控件和布局

//下面是事件处理程序

//--------------- 数字键 ----------------

class JianTing implements ActionListener

{

public void actionPerformed(ActionEvent e)

{

String ss=((JButton)e.getSource()).getText();

jicunqi=(JButton)e.getSource();

vt.add(jicunqi);

if (k1==1)

{

if(k3==1)

{

str1="";

k5=1;//还原开关k5状态

}

str1=str1+ss;

//k2=1;

k3=k3+1;

//System.out.println(str1);

jg_TextField.setText(str1);//显示

}

else if(k1==2)

{

if (k4==1)

{

str2="";

k5=1; //还原开关k5状态

}

str2=str2+ss;

//k2=2;

k4=k4+1;

///////////////测试////////////////

jg_TextField.setText(str2);

}

//－－－－－－－－符号－－－－－－－－－－－

class JianTing_fh implements ActionListener

{

public void actionPerformed(ActionEvent e)

{

String ss2=((JButton)e.getSource()).getText();

jicunqi=(JButton)e.getSource();

vt.add(jicunqi);

if(k2==1)

{

k1=2;//开关 k1 为1时,向数1写为2时，向数2写

k5=1;

fh=ss2;

k2=k2+1;//按符号键的次数

}

else

{

int a=vt.size();

JButton c=(JButton)vt.get(a-2); if(!(c.getText().equals("+"))!(c.getText().equals("-"))!(c.getText().equals("*"))!(c.getText().equals("/")))

{

yuns();

str1=jg;

k1=2;//开关 k1 为1时,向数1写为2时，向数2写

k5=1;

k4=1;

fh=ss2;

} k2=k2+1;

}

//－－－－－－－－清除－－－－－－－

class JianTing_clear implements ActionListener

{

public void actionPerformed(ActionEvent e)

{

jicunqi=(JButton)e.getSource();

vt.add(jicunqi);

k5=1;

k2=1;

k1=1;

k3=1;

k4=1;

str1="0";

str2="0";

fh="";

jg="";

jg_TextField.setText(jg);

vt.clear();

}

//----------------等于 ---------------------

class JianTing_dy implements ActionListener

{

public void actionPerformed(ActionEvent e)

{

jicunqi=(JButton)e.getSource();

vt.add(jicunqi);

yuns();

k1=1; //还原开关k1状态

//str1=jg;

k2=1;

k3=1;//还原开关k3状态

k4=1; //还原开关k4状态

str1=jg; //为7+5=12 +5=17 这种计算做准备

}

//----------------小数点 ---------------------

class JianTing_xiaos implements ActionListener

{

public void actionPerformed(ActionEvent e)

{

jicunqi=(JButton)e.getSource();

vt.add(jicunqi);

if(k5==1)

{

String ss2=((JButton)e.getSource()).getText();

if (k1==1)

{

if(k3==1)

{

str1="";

k5=1; //还原开关k5状态

}

str1=str1+ss2;

//k2=1;

k3=k3+1;

//System.out.println(str1);

jg_TextField.setText(str1);//显示

}

else if(k1==2)

{

if (k4==1)

{

str2="";

k5=1; //还原开关k5状态

}

str2=str2+ss2;

//k2=2;

k4=k4+1;

///////////////测试////////////////

jg_TextField.setText(str2);

}

k5=k5+1;

}

//注册监听器

JianTing_dy jt_dy=new JianTing_dy();

JianTing jt= new JianTing();//临听数字键

JianTing_fh jt_fh= new JianTing_fh();//临听符号键

JianTing_clear jt_c=new JianTing_clear(); //清除键

JianTing_xiaos jt_xs=new JianTing_xiaos();// 小数点键

button7.addActionListener(jt);

button8.addActionListener(jt);

button9.addActionListener(jt);

button_chu.addActionListener(jt_fh);

button4.addActionListener(jt);

button5.addActionListener(jt);

button6.addActionListener(jt);

button_cheng.addActionListener(jt_fh);

button1.addActionListener(jt);

button2.addActionListener(jt);

button3.addActionListener(jt);

button_jian.addActionListener(jt_fh);

button0.addActionListener(jt);

button_Dian.addActionListener(jt_xs);

button_dy.addActionListener(jt_dy);

button_jia.addActionListener(jt_fh);

clear_Button.addActionListener(jt_c);

//关闭事件处理程序

frame.addWindowListener(new WindowAdapter()

{

public void windowClosing(WindowEvent e)

{

System.exit(0);

}

});

}

//---------------计算------------------

public void yuns()

{

double a2,b2;//运算数1,2

String c=fh;// 运算符

double jg2=0 ;//结果

if (c.equals(""))

{

//System.out.println("请输入运算符");

jg_TextField.setText("请输入运算符");

}

else

{

System.out.println("str1:"+str1);//调试时使用

System.out.println("str2:"+str2);//调试时使用

System.out.println("运算符:"+fh);//调试时使用

if (str1.equals(".")) //字符串 "." 转换成double型数据时会出错所以手工转

str1="0.0";

if (str2.equals("."))

str2="0.0";

a2=Double.valueOf(str1).doubleValue();

b2=Double.valueOf(str2).doubleValue();

System.out.println("double型的a2："+a2); //调试时使用

System.out.println("double型的b2："+b2); //调试时使用

if (c.equals("+"))

{

jg2=a2+b2;

}

if (c.equals("-"))

{

jg2=a2-b2;

}

if (c.equals("*"))

{

jg2=a2*b2;

}

if (c.equals("/"))

{

if(b2==0)

{

jg2=0;//0000000000000 by 0 cu!

}

else

{

jg2=a2/b2;

}

System.out.println("double型a2"+fh+"b2结果："+jg2);

System.out.println();

jg=((new Double(jg2)).toString());

jg_TextField.setText(jg);

}

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