做一个eclipse的计算机程序

以下是一个简单的计算器程序的示例代码。你可以在Eclipse中创建一个Java项目并将其复制到您的代码中。该程序接受两个数字和操作符，并返回计算结果。

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.println("Enter first number:");
        num1 = input.nextDouble();

        System.out.println("Enter operator (+, -, *, /):");
        operator = input.next().charAt(0);

        System.out.println("Enter second number:");
        num2 = input.nextDouble();

        switch (operator) {
            case '+':
                result = num1 + num2;
                System.out.println(num1 + " + " + num2 + " = " + result);
                break;
            case '-':
                result = num1 - num2;
                System.out.println(num1 + " - " + num2 + " = " + result);
                break;
            case '*':
                result = num1 * num2;
                System.out.println(num1 + " * " + num2 + " = " + result);
                break;
            case '/':
                result = num1 / num2;
                System.out.println(num1 + " / " + num2 + " = " + result);
                break;
            default:
                System.out.println("Invalid operator!");
                break;
        }
        input.close();
    }
}

提示：在输入操作符时，使用 `.charAt(0)` 以获取输入字符串的第一个字符。