java四則運算器代碼 java編寫四則運算器

java四則運算

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 ;//這里的clickabel 是用來判斷小數(shù)點的如果有小數(shù)點的話 clickable則為false就不對小數(shù)點進行添加了 i在下面有解釋

private double value=0; //這個就是顯示出來的值了

String operate = "="; //操作數(shù) 默認(rèn)情況下是=號

JFrame jframe=new JFrame("計算機");

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"); //顯示圓周率小數(shù)點后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)); //采用的布局方式為網(wǎng)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(); //獲取按鈕的數(shù)據(jù)

if(soc==back){ //進行退格操作

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")){ //顯示圓周率

double Pi=3.1415926;

String pi=String.valueOf(Pi);

text1.setText(pi);

}

else if(s.equals("+/-")){ //變換正負(fù)號

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(".")){ //小數(shù)點

clickable=true;

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

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

{

clickable=false;

break;

} //第一層判斷是否里面含有小數(shù)點;

if(clickable==true) //第二層判斷

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

i=false;

}

else if(s.equals("C")){ //清零所有的數(shù)據(jù)變回初始值

value = 0;

text1.setText("0");

i=true;

operate = "=" ;

}

else if ('0' = s.charAt(0) s.charAt(0) = '9' ) { //若輸入的為數(shù)字以及小數(shù)點的時候執(zhí)行下面

if (i) { //判斷獲得的command是否為操作符

text1.setText(s);

}

else {

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

}

i = false;

}

else { //若輸入運算操作符的話則執(zhí)行下面的代碼

count(Double.parseDouble(text1.getText().trim())); //這里一開始調(diào)用 count()方法的話首先執(zhí)行的是operate.equals("=")

//執(zhí)行上個操作符的運算

operate = s;

i = true;

}

private void count(double a) { //計算區(qū)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();

}

這是例子你可以參考下~監(jiān)聽的部分

java 寫的計算器源代碼只實現(xiàn)加減乘除四則運算即可

import java.awt.*;

import java.awt.event.*;

import javax.swing.*;

import java.util.Vector;

public class calculator

{

String str1="0"; //運算數(shù)1 初值一定為0 為了程序的安全

String str2="0"; //運算數(shù)2

String fh="+"; //運算符

String jg="";//結(jié)果

//狀態(tài)開關(guān) 重要

int k1=1;//開關(guān)1 用于選擇輸入方向將要寫入str2或 str2

int k2=1;//開關(guān)2 符號鍵次數(shù) k21說明進行的是2+3-9+8 這樣的多符號運算

int k3=1;//開關(guān)3 str1 是否可以被清0 ==1時可以 !=1時不能被清0

int k4=1;//開關(guān)4 str2 同上

int k5=1;//開關(guān)5 控制小數(shù)點可否被錄入 ==1時可以 !=1 輸入的小數(shù)點被丟掉

JButton jicunqi; //寄存器記錄是否連續(xù)按下符號鍵

Vector vt=new Vector(20,10);

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

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 );//文本框右對齊

JPanel pan=new JPanel();

pan.setLayout(new GridLayout(4,4,5,5));//四行四列邊距為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對象的邊距

JPanel pan2=new JPanel();

pan2.add(jg_TextField);

JPanel pan3=new JPanel(); //為什么要多此一句呢？因為我不會設(shè)置按鈕的大小

pan3.setLayout(new FlowLayout());

pan3.add(clear_Button);

//clear_Button.setSize(10,10);//設(shè)置清零按鈕的大小嗎的不好使 ??！

frame.setLocation(300, 200); //主窗口出現(xiàn)在位置

frame.setResizable(false); //不能調(diào)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

//下面是事件處理程序

//--------------- 數(shù) 字鍵 ----------------

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;//還原開關(guān)k5狀態(tài)

}

str1=str1+ss;

//k2=1;

k3=k3+1;

//System.out.println(str1);

jg_TextField.setText(str1);//顯示

}

else if(k1==2)

{

if (k4==1)

{

str2="";

k5=1; //還原開關(guān)k5狀態(tài)

}

str2=str2+ss;

//k2=2;

k4=k4+1;

///////////////測試////////////////

jg_TextField.setText(str2);

}

//－－－－－－－－符號－－－－－－－－－－－

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;//開關(guān) k1 為1時,向數(shù)1寫為2時，向數(shù)2寫

k5=1;

fh=ss2;

k2=k2+1;//按符號鍵的次數(shù)

}

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;//開關(guān) k1 為1時,向數(shù)1寫為2時，向數(shù)2寫

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; //還原開關(guān)k1狀態(tài)

//str1=jg;

k2=1;

k3=1;//還原開關(guān)k3狀態(tài)

k4=1; //還原開關(guān)k4狀態(tài)

str1=jg; //為7+5=12 +5=17 這種計算做準(zhǔn)備

}

//----------------小數(shù)點 ---------------------

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; //還原開關(guān)k5狀態(tài)

}

str1=str1+ss2;

//k2=1;

k3=k3+1;

//System.out.println(str1);

jg_TextField.setText(str1);//顯示

}

else if(k1==2)

{

if (k4==1)

{

str2="";

k5=1; //還原開關(guān)k5狀態(tài)

}

str2=str2+ss2;

//k2=2;

k4=k4+1;

///////////////測試////////////////

jg_TextField.setText(str2);

}

k5=k5+1;

}

//注冊監(jiān)聽器

JianTing_dy jt_dy=new JianTing_dy();

JianTing jt= new JianTing();//臨聽數(shù)字鍵

JianTing_fh jt_fh= new JianTing_fh();//臨聽符號鍵

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

JianTing_xiaos jt_xs=new JianTing_xiaos();// 小數(shù)點鍵

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);

//關(guān)閉事件處理程序

frame.addWindowListener(new WindowAdapter()

{

public void windowClosing(WindowEvent e)

{

System.exit(0);

}

});

}

//---------------計算------------------

public void yuns()

{

double a2,b2;//運算數(shù)1,2

String c=fh;// 運算符

double jg2=0 ;//結(jié)果

if (c.equals(""))

{

//System.out.println("請輸入運算符");

jg_TextField.setText("請輸入運算符");

}

else

{

System.out.println("str1:"+str1);//調(diào)試時使用

System.out.println("str2:"+str2);//調(diào)試時使用

System.out.println("運算符:"+fh);//調(diào)試時使用

if (str1.equals(".")) //字符串 "." 轉(zhuǎn)換成double型數(shù)據(jù)時會出錯所以手工轉(zhuǎn)

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); //調(diào)試時使用

System.out.println("double型的b2："+b2); //調(diào)試時使用

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結(jié)果："+jg2);

System.out.println();

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

jg_TextField.setText(jg);

}

編寫一個實現(xiàn)四則運算的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("請輸入第一個數(shù)：");

double x = scanner.nextDouble();

System.out.print("請輸入第二個數(shù)：");

double y = scanner.nextDouble();

System.out.print("請輸入運算符：");

String s = scanner.next();

char z = s.charAt(0);

zhidao.yunsuan(x, y, z);

}catch(Exception e){

System.out.println("請輸入正確的數(shù)據(jù)！");

}

System.out.print("是否繼續(xù)？continue：繼續(xù)，任意字符：結(jié)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("被除數(shù)不能為0");

} else{

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

}

}else{

System.out.println("無法識別改運算符");

}

用java編程加減乘除計算器

剛好用設(shè)計模式（簡單工廠模式）編寫了一個計算器。

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 四則運算器

（首先建個類，把這些復(fù)制粘貼進去）

import java.awt.*;

import javax.swing.*;

public class F {

JFrame frame = new JFrame("計算機");

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();

}

(再新建個類把這些也復(fù)制粘貼進去)

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);

}

（再新建一個，把下面的復(fù)制粘貼）

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 = "";

}

（在建一個復(fù)制粘貼）

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;

}

（在建一個）

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("");

}

名稱欄目：java四則運算器代碼 java編寫四則運算器
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