JAVA模拟计算器

好的，下面是一个简单的JAVA模拟计算器代码示例：

import java.util.Scanner;

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

运行程序后，用户输入第一个数字、运算符和第二个数字，程序根据运算符进行相应的计算，并输出结果。