怎么用java編程，實(shí)現(xiàn)分?jǐn)?shù)的加減乘除運(yùn)算

1、打開(kāi)eclipse，創(chuàng)建一個(gè)Java工程，在此工程里新建一個(gè)類；

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2、在新建的類中，添加4個(gè)運(yùn)算類；

3、在主方法中調(diào)用對(duì)應(yīng)的方法即可完成分?jǐn)?shù)的加減乘除運(yùn)算了。

具體實(shí)現(xiàn)代碼如下：

public class Demo {

public static void main(String[] args) {

System.out.println(jia(1, 2));

System.out.println(jian(1, 2));

System.out.println(cheng(1, 2));

System.out.println(chu(1, 2));

}

//加法運(yùn)算

private static float jia(float x,float y) {

return x + y;

}

//減法運(yùn)算

private static float jian(float x,float y) {

return x - y;

}

//乘法運(yùn)算

private static float cheng(float x,float y) {

return x * y;

}

//除法運(yùn)算

private static float chu(float x,float y) {

return x / y;

}

}

Java實(shí)現(xiàn)兩個(gè)無(wú)限大的數(shù)的加減乘除運(yùn)算

根據(jù)你的要求，我寫(xiě)了一下代碼，如下：package com.fer2005.test;public class AddUtil { /**

* @param a1 大數(shù)字1，按數(shù)組存儲(chǔ)

* @param a2 大數(shù)字2，按數(shù)組存儲(chǔ)

* @return 返回結(jié)果數(shù)組

*/

public int[] getResult(int[] a1,int[] a2){

//取最大的長(zhǎng)度作為返回結(jié)果的長(zhǎng)度，此時(shí)未考慮是否有進(jìn)位

int length=a1.lengtha2.length?a1.length:a2.length;

//新建未考慮進(jìn)位的數(shù)組結(jié)果

int[] tmp_res =new int[length];

int i=0;

//循環(huán)相加得到res的按照最短數(shù)組相加的結(jié)果

while(ia1.lengthia2.length){

i++;

tmp_res[length-i]=a1[a1.length-i]+a2[a2.length-i];

}

//操作完成后，需將長(zhǎng)數(shù)組的值賦給res

//a1的長(zhǎng)度說(shuō)明a1比a2長(zhǎng)度小，res需要獲取a2的前幾位

if(a1.lengtha2.length){

while(length-i0){

tmp_res[length-i-1]=a2[a2.length-i-1];

i++;

}

}else if(a1.lengtha2.length){

//說(shuō)明a2比a1長(zhǎng)度小，res需要獲取a1的前幾位

while(length-i0){

tmp_res[length-i-1]=a1[a1.length-i-1];

i++;

}

} //考慮進(jìn)位問(wèn)題，如果某一元素大于10，則本身減10，前一元素加1，如果第一個(gè)元素大于10，特殊處理。

//需處理相加之和大于10的情況

for(int k=tmp_res.length-1;k0;k--){

if(tmp_res[k]=10){

tmp_res[k-1]=tmp_res[k-1]+1;

tmp_res[k]=tmp_res[k]-10;

}

}

int[] res=new int[length+1];

//首位情況特殊處理

if(tmp_res[0]=10){

res[0]=1;

res[1]=tmp_res[0]-10;

for(int m=1;mtmp_res.length;m++){

res[m+1]=tmp_res[m];

}else{ res=tmp_res; }

}

return res;

}

/**

* @param args

*/

public static void main(String[] args) {

// TODO Auto-generated method stub

AddUtil addUtil = new AddUtil();

int[] a1= {9,2,3,8,5};

int[] a2={1,9,2,3,9};

for(int j:addUtil.getResult(a1, a2)){

System.out.print(j+",");

}

}}

求簡(jiǎn)單java寫(xiě)計(jì)算器代碼加減乘除

import javax.swing.*;

import java.awt.*;

import java.awt.event.*;

public class Calculator extends JFrame implements ActionListener

{

private boolean dotExist, operated, equaled; // 幫助運(yùn)算的布爾變量

private double storedNumber; // 目前的結(jié)果

private char lastOperator; // 表示上一運(yùn)算符

private JTextField operation; // 結(jié)果欄

private JButton dot, plus, minus, multi, div, sqrt, equal, changePN, clear; // 運(yùn)算符

private JButton[] numbers; // 數(shù)字

// 構(gòu)造者

public Calculator()

{

setTitle("Calculator");

// 初始化變量

dotExist = false; // 表示當(dāng)前的數(shù)是否有小數(shù)點(diǎn)

operated = false; // 表示任意運(yùn)算符是否被按下

equaled = false; // 表示等號(hào)是否被按下

storedNumber = 0;

lastOperator = '?';

// 初始化窗口變量

operation = new JTextField("0");

operation.setEditable(false);

numbers = new JButton[10];

for (int i = 0; i 10; i++)

numbers[i] = new JButton("" + i);

dot = new JButton(".");

plus = new JButton("+");

minus = new JButton("-");

multi = new JButton("*");

div = new JButton("/");

sqrt = new JButton("√");

equal = new JButton("=");

changePN = new JButton("±");

clear = new JButton("AC");

// 將窗口物體放入窗口

GridBagLayout layout = new GridBagLayout();

getContentPane().setLayout(layout);

addComponent(layout, operation, 0, 0, 4, 1);

addComponent(layout, numbers[1], 1, 0, 1, 1);

addComponent(layout, numbers[2], 1, 1, 1, 1);

addComponent(layout, numbers[3], 1, 2, 1, 1);

addComponent(layout, numbers[4], 2, 0, 1, 1);

addComponent(layout, numbers[5], 2, 1, 1, 1);

addComponent(layout, numbers[6], 2, 2, 1, 1);

addComponent(layout, numbers[7], 3, 0, 1, 1);

addComponent(layout, numbers[8], 3, 1, 1, 1);

addComponent(layout, numbers[9], 3, 2, 1, 1);

addComponent(layout, dot, 4, 0, 1, 1);

addComponent(layout, numbers[0], 4, 1, 1, 1);

addComponent(layout, sqrt, 4, 2, 1, 1);

addComponent(layout, plus, 1, 3, 1, 1);

addComponent(layout, minus, 2, 3, 1, 1);

addComponent(layout, multi, 3, 3, 1, 1);

addComponent(layout, div, 4, 3, 1, 1);

addComponent(layout, equal, 5, 0, 2, 1);

addComponent(layout, changePN, 5, 2, 1, 1);

addComponent(layout, clear, 5, 3, 1, 1);

}

// 對(duì)按鈕進(jìn)行反應(yīng)的方法

public void actionPerformed(ActionEvent e)

{

JButton btn = (JButton)e.getSource();

if (btn == clear)

{

operation.setText("0");

dotExist = false;

storedNumber = 0;

lastOperator = '?';

}

else if (btn == equal)

{

operate('=');

equaled = true;

}

else if (btn == plus)

{

operate('+');

equaled = false;

}

else if (btn == minus)

{

operate('-');

equaled = false;

}

else if (btn == multi)

{

operate('*');

equaled = false;

}

else if (btn == div)

{

operate('/');

equaled = false;

}

else if (btn == changePN)

{

operate('p');

operate('=');

equaled = true;

}

else if (btn == sqrt)

{

operate('s');

operate('=');

equaled = true;

}

else

{

if (equaled)

storedNumber = 0;

for (int i = 0; i 10; i++)

if (btn == numbers[i])

{

if (operation.getText().equals("0"))

operation.setText("" + i);

else if(! operated)

operation.setText(operation.getText() + i);

else

{

operation.setText("" + i);

operated = false;

}

}

if (btn == dot ! dotExist)

{

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

dotExist = true;

}

}

}

// 進(jìn)行運(yùn)算的方法

private void operate(char operator)

{

double currentNumber = Double.valueOf(operation.getText()).doubleValue();

if (lastOperator == '?')

storedNumber = currentNumber;

else if (lastOperator == '+')

storedNumber += currentNumber;

else if (lastOperator == '-')

storedNumber -= currentNumber;

else if (lastOperator == '*')

storedNumber *= currentNumber;

else if (lastOperator == '/')

storedNumber /= currentNumber;

else if (lastOperator == 'p')

storedNumber *= -1;

else if (lastOperator == 's')

storedNumber = Math.sqrt(currentNumber);

else if (lastOperator == '=' equaled)

storedNumber = currentNumber;

operation.setText("" + storedNumber);

operated = true;

lastOperator = operator;

}

// 快捷使用GridBagLayout的方法

private void addComponent(GridBagLayout layout, Component component, int row, int col, int width, int height)

{

GridBagConstraints constraints = new GridBagConstraints();

constraints.fill = GridBagConstraints.BOTH;

constraints.insets = new Insets(10, 2, 10, 2);

constraints.weightx = 100;

constraints.weighty = 100;

constraints.gridx = col;

constraints.gridy = row;

constraints.gridwidth = width;

constraints.gridheight = height;

layout.setConstraints(component, constraints);

if (component instanceof JButton)

((JButton)component).addActionListener(this);

getContentPane().add(component);

}

// 主方法初始化并顯示窗口

public static void main(String[] args)

{

Calculator calc = new Calculator();

calc.setSize(290, 400);

calc.setVisible(true);

}

}

用Java編寫(xiě)實(shí)現(xiàn)加減乘除，界面如下

用Java編寫(xiě)的實(shí)現(xiàn)加減乘除的程序如下

import?java.awt.BorderLayout;

import?java.awt.event.ActionEvent;

import?java.awt.event.ActionListener;

import?javax.swing.JButton;

import?javax.swing.JComboBox;

import?javax.swing.JFrame;

import?javax.swing.JLabel;

import?javax.swing.JOptionPane;

import?javax.swing.JPanel;

import?javax.swing.JTextField;

public?class?Calculator?extends?JFrame?implements?ActionListener{

JLabel?jl1=new?JLabel("第一個(gè)數(shù)");

JLabel?jl2=new?JLabel("運(yùn)算符");

JLabel?jl3=new?JLabel("第二個(gè)數(shù)");

JLabel?jl4=new?JLabel("結(jié)果:");

JTextField?jtf1=new?JTextField(8);

JTextField?jtf2=new?JTextField(8);

JTextField?jtf3=new?JTextField(8);

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

JComboBoxString?jcb=new?JComboBoxString(a);

JButton?jb1=new?JButton("計(jì)算");

JButton?jb2=new?JButton("退出");

JPanel?jp=new?JPanel();

Calculator(){

setTitle("計(jì)算器");

jb1.addActionListener(this);

jb2.addActionListener(this);

jp.setLayout(null);

jl1.setBounds(30,?30,?80,?20);

jl2.setBounds(110,?30,?80,?20);

jl3.setBounds(190,?30,?80,?20);

jtf1.setBounds(30,?60,?70,?20);

jcb.setBounds(110,?60,?70,20);

jtf2.setBounds(190,?60,?70,?20);

jl4.setBounds(80,?110,?40,?20);

jtf3.setBounds(110,?110,?100,?20);

jb1.setBounds(60,?160,?60,?25);

jb2.setBounds(170,?160,?60,?25);

jp.add(jl1);jp.add(jl2);jp.add(jl3);

jp.add(jtf1);jp.add(jcb);jp.add(jtf2);

jp.add(jl4);jp.add(jtf3);

jp.add(jb1);jp.add(jb2);

add(jp,BorderLayout.CENTER);

setSize(300,?300);

setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

setLocationRelativeTo(null);

setVisible(true);

}

public?static?void?main(String[]?args)?{

new?Calculator();

}

@Override

public?void?actionPerformed(ActionEvent?ae)?{

if(ae.getSource()==jb1){

String?c=((String)?jcb.getSelectedItem()).trim();

if(jtf1.getText().trim().equals("")){

JOptionPane.showMessageDialog(this,?"第一個(gè)數(shù)不能為空");

jtf1.requestFocus();

return;

}

if(jtf2.getText().trim().equals("")){

JOptionPane.showMessageDialog(this,?"第二個(gè)數(shù)不能為空");

jtf2.requestFocus();

return;

}

double?num1=Double.parseDouble(jtf1.getText().trim());

double?num2=Double.parseDouble(jtf2.getText().trim());

double?num3?=?0;

switch(c){

case?"+":num3=num1+num2;break;

case?"-":num3=num1-num2;break;

case?"*":num3=num1*num2;break;

case?"/":

if(num2==0){

JOptionPane.showMessageDialog(this,?"除數(shù)不能為0");

jtf2.requestFocus();

return;

}else{

num3=num1/num2;

break;

}

}

jtf3.setText(String.valueOf(num3));

}

if(ae.getSource()==jb2){

System.exit(0);

}

}

}

運(yùn)行結(jié)果

運(yùn)用JAVA中大數(shù)類實(shí)現(xiàn)大數(shù)的四則運(yùn)算

import java.math.BigInteger;

public class BigIntegerGet {

public String getAdd(String Str1,String Str2){

String Str3=new String();

BigInteger BigInt1=new BigInteger(Str1);

BigInteger BigInt2=new BigInteger(Str2);

BigInt1=BigInt1.add(BigInt2);

Str3=BigInt1.toString();

return Str3;

}

public String getSubtract(String Str1,String Str2){

String Str3=new String();

BigInteger BigInt1=new BigInteger(Str1);

BigInteger BigInt2=new BigInteger(Str2);

BigInt1=BigInt1.subtract(BigInt2);

Str3=BigInt1.toString();

return Str3;

}

public String getMultiply(String Str1,String Str2){

String Str3=new String();

BigInteger BigInt1=new BigInteger(Str1);

BigInteger BigInt2=new BigInteger(Str2);

BigInt1=BigInt1.multiply(BigInt2);

Str3=BigInt1.toString();

return Str3;

}

public String getDivide(String Str1,String Str2){

String Str3=new String();

BigInteger BigInt1=new BigInteger(Str1);

BigInteger BigInt2=new BigInteger(Str2);

BigInt1=BigInt1.divide(BigInt2);

Str3=BigInt1.toString();

return Str3;

}

}

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