java四则运算器代码 java编写四则运算器

java四则运算

import java.awt.*;

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import java.awt.event.*;

import javax.swing.*;

public class calculator extends JFrame implements ActionListener {

private boolean i=true,clickable = true ;//这里的clickabel 是用来判断小数点的如果有小数点的话 clickable则为false就不对小数点进行添加了 i在下面有解释

private double value=0; //这个就是显示出来的值了

String operate = "="; //操作数默认情况下是=号

JFrame jframe=new JFrame("计算机");

JTextField text1=new JTextField("0");

JButton back = new JButton("退格");

JButton daoshu = new JButton("1/x");

JButton remain = new JButton("%");

JButton PI = new JButton("PI"); //显示圆周率小数点后7位

JButton square = new JButton("x^2");

JButton cube = new JButton("x^3");

JButton plu=new JButton("+");

JButton min=new JButton("-");

JButton mul=new JButton("*");

JButton equ=new JButton("=");

JButton div=new JButton("/");

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

JButton point=new JButton(".");

JButton num1=new JButton("1");

JButton num2=new JButton("2");

JButton num3=new JButton("3");

JButton num4=new JButton("4");

JButton num5=new JButton("5");

JButton num6=new JButton("6");

JButton num7=new JButton("7");

JButton num8=new JButton("8");

JButton num9=new JButton("9");

JButton num0=new JButton("0");

JButton num00=new JButton("00");

JButton clear=new JButton("C");

calculator(){

jframe.setSize(400, 400);

jframe.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

JPanel p=new JPanel();

p.setBackground(Color.gray);

p.setLayout(new GridLayout(5, 5)); //采用的布局方式为网格布局

PI.addActionListener(this);

daoshu.addActionListener(this);

remain.addActionListener(this);

square.addActionListener(this);

cube.addActionListener(this);

plu.addActionListener(this);

equ.addActionListener(this);

num1.addActionListener(this);

num2.addActionListener(this);

clear.addActionListener(this);

num3.addActionListener(this);

num4.addActionListener(this);

num5.addActionListener(this);

num6.addActionListener(this);

num7.addActionListener(this);

num8.addActionListener(this);

num9.addActionListener(this);

num0.addActionListener(this);

num00.addActionListener(this);

min.addActionListener(this);

code.addActionListener(this);

div.addActionListener(this);

point.addActionListener(this);

mul.addActionListener(this);

back.addActionListener(this);

jframe.add(p);

p.add(PI);

p.add(code);

p.add(daoshu);

p.add(back);

p.add(clear);

p.add(num7);

p.add(num8);

p.add(num9);

p.add(plu);

p.add(remain);

p.add(num4);

p.add(num5);

p.add(num6);

p.add(min);

p.add(square);

p.add(num1);

p.add(num2);

p.add(num3);

p.add(mul);

p.add(cube);

p.add(num0);

p.add(num00);

p.add(point);

p.add(div);

p.add(equ);

jframe.add(text1,"North");

jframe.setLocation(300, 300);

jframe.setVisible(true);

}

public void actionPerformed(ActionEvent evt)

{

String str1,str2;

Object soc=evt.getSource();

String s = evt.getActionCommand(); //获取按钮的数据

if(soc==back){ //进行退格操作

str1=text1.getText();

int n=str1.length();

text1.setText(str1.substring(0,n-1));

str2 = text1.getText();

}

else if (s.equals("x^2")) {

str1=text1.getText();

double k = Double.parseDouble(str1);

k *=k;

text1.setText(String.valueOf(k));

}

else if (s.equals("x^3")) {

str1=text1.getText();

double k = Double.parseDouble(str1);

k =k*k*k;

text1.setText(String.valueOf(k));

}

else if(s.equals("PI")){ //显示圆周率

double Pi=3.1415926;

String pi=String.valueOf(Pi);

text1.setText(pi);

}

else if(s.equals("+/-")){ //变换正负号

double a = 0;

str1=text1.getText();

a=Double.parseDouble(str1.trim());

a=-1*a;

str1=String.valueOf(a);

text1.setText(str1);

}

else if(s.equals("1/x")){ //求倒

str1=text1.getText();

double i = 1/Double.parseDouble(str1.trim());

String k = String.valueOf(i);

text1.setText(k);

}

else if(s.equals(".")){ //小数点

clickable=true;

for (int i = 0; i text1.getText().length(); i++)

if ('.' == text1.getText().charAt(i))

{

clickable=false;

break;

} //第一层判断是否里面含有小数点;

if(clickable==true) //第二层判断

text1.setText(text1.getText()+".");

i=false;

}

else if(s.equals("C")){ //清零所有的数据变回初始值

value = 0;

text1.setText("0");

i=true;

operate = "=" ;

}

else if ('0' = s.charAt(0) s.charAt(0) = '9' ) { //若输入的为数字以及小数点的时候执行下面

if (i) { //判断获得的command是否为操作符

text1.setText(s);

}

else {

text1.setText(text1.getText() + s);

}

i = false;

}

else { //若输入运算操作符的话则执行下面的代码

count(Double.parseDouble(text1.getText().trim())); //这里一开始调用 count()方法的话首先执行的是operate.equals("=")

//执行上个操作符的运算

operate = s;

i = true;

}

private void count(double a) { //计算区域

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

value += a;

}

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

value -= a;

}

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

value *= a;

}

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

value /= a;

}

else if (operate.equals("%")) {

value %= a;

}

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

value = a;

}

text1.setText(Double.toString(value));

}

public static void main(String[] arg)

{

calculator cal=new calculator();

}

这是例子你可以参考下~监听的部分

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);

}

编写一个实现四则运算的JAVA程序

import java.text.DecimalFormat;

import java.util.Scanner;

public class Zhidao {

public static void main(String[] args) {

String condition = "";

Zhidao zhidao = new Zhidao();

do{

Scanner scanner = new Scanner(System.in);

try{

System.out.print("请输入第一个数：");

double x = scanner.nextDouble();

System.out.print("请输入第二个数：");

double y = scanner.nextDouble();

System.out.print("请输入运算符：");

String s = scanner.next();

char z = s.charAt(0);

zhidao.yunsuan(x, y, z);

}catch(Exception e){

System.out.println("请输入正确的数据！");

}

System.out.print("是否继续？continue：继续，任意字符：结束");

condition = scanner.next();

}while("continue".equals(condition));

}

public static void yunsuan(double x,double y,Character z){

DecimalFormat r=new DecimalFormat();

r.applyPattern("#0.00");

if(z.equals('+')){

System.out.println(x+"+"+y+"=" + r.format((x+y)));

} else if(z.equals('-')){

System.out.println(x+"-"+y+"=" + r.format((x-y)));

} else if(z.equals('*')){

System.out.println(x+"*"+y+"=" + r.format((x*y)));

} else if(z.equals('/')){

if(y==0){

System.out.println("被除数不能为0");

} else{

System.out.println(x+"/"+y+"=" + r.format((x/y)));

}

}else{

System.out.println("无法识别改运算符");

}

用java编程加减乘除计算器

刚好用设计模式（简单工厂模式）编写了一个计算器。

package com.medavis.simplefactory.ui;

import java.util.Scanner;

import com.medavis.simplefactory.operate.OperatorFactory;

public class CaculatorUI {

private static Scanner sc;

public static void main(String[] args) {

try {

System.out.println("Please input a number:");

sc = new Scanner(System.in);

long first = sc.nextLong();

System.out.println("Please input a operational character (+-*/):");

sc = new Scanner(System.in);

String operator = sc.nextLine();

System.out.println("Please input a number:");

sc = new Scanner(System.in);

long second = sc.nextLong();

OperatorFactory opf=new OperatorFactory();

System.out.println(first + operator + second + "=" + opf.getOperator(operator).getResult(first, second));

} catch(Exception e) {

System.out.println("Your input is wrong!");

}

package com.medavis.simplefactory.operate;

public class OperatorAdd extends Operator{

@Override

public long getResult(long first, long second) {

return first+second;

}

package com.medavis.simplefactory.operate;

public class OperatorDiv extends Operator{

@Override

public long getResult(long first, long second) {

return first/second;

}

package com.medavis.simplefactory.operate;

public class OperatorFactory {

public Operator getOperator(String operator) throws Exception{

switch(operator){

case "+":

return new OperatorAdd();

case "-":

return new OperatorSub();

case "*":

return new OperatorMul();

case "/":

return new OperatorDiv();

default:

throw new Exception();

}

package com.medavis.simplefactory.operate;

public class OperatorMul extends Operator {

@Override

public long getResult(long first, long second) {

return first*second;

}

package com.medavis.simplefactory.operate;

public class OperatorSub extends Operator{

@Override

public long getResult(long first, long second) {

return first-second;

}

java 四则运算器

（首先建个类，把这些复制粘贴进去）

import java.awt.*;

import javax.swing.*;

public class F {

JFrame frame = new JFrame("计算机");

JPanel pl = new JPanel();

JPanel p2 = new JPanel();

static JTextField show = new JTextField();

static JButton b0 = new JButton("0");

static JButton b1 = new JButton("1");

static JButton b2 = new JButton("2");

static JButton b3 = new JButton("3");

static JButton b4 = new JButton("4");

static JButton b5 = new JButton("5");

static JButton b6 = new JButton("6");

static JButton b7 = new JButton("7");

static JButton b8 = new JButton("8");

static JButton b9 = new JButton("9");

JButton bjia = new JButton("+");

JButton bjian = new JButton("-");

JButton bcheng = new JButton("*");

JButton bchu = new JButton("/");

JButton bdian = new JButton(".");

JButton bdeng = new JButton("=");

JButton bqingchu = new JButton("清除");

public void y() {

pl.setLayout(new GridLayout(1, 1));

pl.add(show);

}

public void p() {

b1.addActionListener(new U());

b2.addActionListener(new U());

b3.addActionListener(new U());

b4.addActionListener(new U());

b5.addActionListener(new U());

b6.addActionListener(new U());

b7.addActionListener(new U());

b8.addActionListener(new U());

b9.addActionListener(new U());

b0.addActionListener(new U());

bjia.addActionListener(new Fu());

bjian.addActionListener(new Fu());

bcheng.addActionListener(new Fu());

bchu.addActionListener(new Fu());

bdeng.addActionListener(new Deng());

bqingchu.addActionListener(new Qing());

p2.setLayout(new GridLayout(6, 3));

p2.add(b1);

p2.add(b2);

p2.add(b3);

p2.add(b4);

p2.add(b5);

p2.add(b6);

p2.add(b7);

p2.add(b8);

p2.add(b9);

p2.add(b0);

p2.add(bjia);

p2.add(bjian);

p2.add(bcheng);

p2.add(bchu);

p2.add(bdian);

p2.add(bqingchu);

p2.add(bdeng);

}

public void o() {

frame.setLayout(new BorderLayout());

frame.add(pl, BorderLayout.NORTH);

frame.add(p2, BorderLayout.CENTER);

frame.setSize(400, 300);

frame.setVisible(true);

}

public static void main(String[] args) {

F f = new F();

f.y();

f.p();

f.o();

}

(再新建个类把这些也复制粘贴进去)

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

public class U implements ActionListener {

public static String str = "";

public static String a = "";

public static String b = "";

public static String k = "";

public void actionPerformed(ActionEvent e) {

String w = e.getActionCommand();//字

if (k.equals("")) {

a += w;

F.show.setText(a);

} else {

b += w;

F.show.setText(b);

}

（再新建一个，把下面的复制粘贴）

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

public class Deng implements ActionListener {

public void actionPerformed(ActionEvent e) {

int a = Integer.parseInt(U.a);

int b = Integer.parseInt(U.b);

int c = 0;

if (U.k.equals("+")) {

c = a + b;

} else

if (U.k.equals("-")) {

c = a - b;

} else

if (U.k.equals("*")) {

c = a * b;

} else

if (U.k.equals("/")) {

c = a / b;

} else {

}

String d = String.valueOf(c);

F.show.setText(d);

U.a = d;

U.b = "";

U.k = "";

}

（在建一个复制粘贴）

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

public class Fu implements ActionListener {

public void actionPerformed(ActionEvent e) {

String a = e.getActionCommand();//字

U.k = a;

}

（在建一个）

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

public class Qing implements ActionListener {

public void actionPerformed(ActionEvent e) {

U.a = "";

U.b = "";

U.k = "";

F.show.setText("");

}

文章标题：java四则运算器代码 java编写四则运算器
标题来源：http://azwzsj.com/article/hphpie.html

java四则运算器代码 java编写四则运算器

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