j ava简易计算器代码

以下是一个简单的 Java 计算器代码，可以执行基本的加、减、乘、除运算：

import java.util.Scanner;

public class Calculator {
    public static void main(String[] args) {
        Scanner input = new Scanner(System.in);
        System.out.print("Enter the first number: ");
        double num1 = input.nextDouble();
        System.out.print("Enter the second number: ");
        double num2 = input.nextDouble();
        System.out.print("Enter an operator (+, -, *, /): ");
        char operator = input.next().charAt(0);
        double result;
        switch (operator) {
            case '+':
                result = num1 + num2;
                break;
            case '-':
                result = num1 - num2;
                break;
            case '*':
                result = num1 * num2;
                break;
            case '/':
                result = num1 / num2;
                break;
            default:
                System.out.println("Invalid operator!");
                return;
        }
        System.out.println(num1 + " " + operator + " " + num2 + " = " + result);
    }
}

运行代码后，会要求用户输入两个数字和操作符。根据操作符执行相应的运算，最后输出结果。