java简单四则运算代码（如何用Java编写四则运算程序）

本文目录

• 如何用Java编写四则运算程序
• 编写java程序实现10以内整数的四则运算练习,五题1组,最后给出得分
• JAVA 四则运算
• 编写一个实现四则运算的JAVA程序

如何用Java编写四则运算程序

（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("");
}
}

编写java程序实现10以内整数的四则运算练习,五题1组,最后给出得分

Scanner scanner = new Scanner(System.in);
DecimalFormat df = new DecimalFormat("#.00");
String type;
int score=0;
System.out.println("计算保留两位小数！");
for(int i=0;i《5;i++){
double result=0;
int a=(int)(Math.random()*10+1);
int b=(int)(Math.random()*4);
int c=(int)(Math.random()*10+1);
switch (b){
case 1:
type="+";
result=a+c;
break;
case 2:
type="-";
result=a-c;
break;
case 3:
type="*";
result=a*c;
break;
default:
type="/";
result=Math.round((a*1.0/c)*100)*0.01;
break;
}
System.out.println(a+type+c+"=");
double in = scanner.nextDouble();
if(in==result){
score+=20;
System.out.println("答对了，牛皮！");
}else {
System.out.println("错了，扣分！");
}
}
System.out.println("你最后的得分为："+score);
不知道具体需求，做了个随机生成题，然后一个个回答的，最后输出总分

JAVA 四则运算

public class Calc extends JFrame {
private  JTextField textNum1;
private  JTextField textNum2;
private  JTextField result;
private  JComboBox opers;
public Calc() {
init();
setSize(300,400);
setLocationRelativeTo(null);
setTitle("计算器");
setDefaultCloseOperation(3);
setVisible(true);
}
private void init(){
String operators = "+,-,*,/".split(",");
textNum1 = new JTextField();
textNum1.setColumns(10);
textNum2 = new JTextField();
textNum2.setColumns(10);
result = new JTextField();
result.setColumns(10);
opers = new JComboBox(operators);
opers.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
int operator = opers.getSelectedIndex();
double num1 = Double.parseDouble(textNum1.getText());
double num2 = Double.parseDouble(textNum2.getText());
switch(operator){
case 0:result.setText(num1 + num2+"");break;
case 1:result.setText(num1 - num2+"");break;
case 2:result.setText(num1 * num2+"");break;
case 3:result.setText(num1 / num2+"");break;
}
}
});
JPanel p = new JPanel();
p.add(textNum1);
p.add(textNum2);
p.add(opers);
p.add(result);
this.add(p);
}
public static void main(String args) {
new Calc();
}
}

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");
}
}
}