四则运算java代码

四则运算是指加法、减法、乘法和除法这四种基本运算。以下是一个简单的Java代码示例，实现了四则运算：

import java.util.Scanner;

public class ArithmeticOperations {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        
        System.out.print("请输入第一个操作数：");
        double num1 = scanner.nextDouble();
        
        System.out.print("请输入第二个操作数：");
        double num2 = scanner.nextDouble();
        
        System.out.println("请选择运算符：");
        System.out.println("1. 加法 (+)");
        System.out.println("2. 减法 (-)");
        System.out.println("3. 乘法 (*)");
        System.out.println("4. 除法 (/)");
        
        int operator = scanner.nextInt();
        
        double result = 0;
        
        switch (operator) {
            case 1:
                result = num1 + num2;
                System.out.println("结果：" + result);
                break;
            case 2:
                result = num1 - num2;
                System.out.println("结果：" + result);                break;
            case 3:
                result = num1 * num2;
                System.out.println("结果：" + result);
                break;
            case 4:
                if (num2 != 0) {
                    result = num1 / num2;
                    System.out.println("结果：" + result);
                } else {
                    System.out.println("除数不能为0！");
                }
                break;
            default:
                System.out.println("无效的运算符！");
                break;
        }
        
        scanner.close();
    }
}