帮我用java写一个简易科学计算器

好的，下面是一个简易的科学计算器的Java代码示例：

import java.util.Scanner;

public class ScientificCalculator {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);

        System.out.println("欢迎使用科学计算器！");

        while (true) {
            System.out.print("请输入要进行的操作：\n1. 加法\n2. 减法\n3. 乘法\n4. 除法\n5. 指数\n6. 平方根\n7. 退出\n");

            int choice = scanner.nextInt();

            if (choice == 7) {
                System.out.println("感谢使用科学计算器！");
                break;
            }

            double result = 0.0;

            switch (choice) {
                case 1:
                    System.out.print("请输入两个数：");
                    double num1 = scanner.nextDouble();
                    double num2 = scanner.nextDouble();
                    result = num1 + num2;
                    break;
                case 2:
                    System.out.print("请输入两个数：");
                    num1 = scanner.nextDouble();
                    num2 = scanner.nextDouble();
                    result = num1 - num2;
                    break;
                case 3:
                    System.out.print("请输入两个数：");
                    num1 = scanner.nextDouble();
                    num2 = scanner.nextDouble();
                    result = num1 * num2;
                    break;
                case 4:
                    System.out.print("请输入两个数：");
                    num1 = scanner.nextDouble();
                    num2 = scanner.nextDouble();
                    result = num1 / num2;
                    break;
                case 5:
                    System.out.print("请输入一个数和指数：");
                    num1 = scanner.nextDouble();
                    num2 = scanner.nextDouble();
                    result = Math.pow(num1, num2);
                    break;
                case 6:
                    System.out.print("请输入一个数：");
                    num1 = scanner.nextDouble();
                    result = Math.sqrt(num1);
                    break;
                default:
                    System.out.println("无效的选择！");
                    continue;
            }

            System.out.println("结果是：" + result);
        }
    }
}

这个计算器可以进行加、减、乘、除、指数和平方根等操作。你可以根据自己的需求进行修改和扩展。