使用Java设计一款简单的计算器（加、减、乘，除，平方、立方）

以下是一个简单的计算器的Java代码示例，支持加、减、乘、除、平方和立方运算：

import java.util.Scanner;

public class Calculator {
    public static void main(String[] args) {
        Scanner input = new Scanner(System.in);
        double num1, num2, result;
        int choice;

        System.out.print("Enter first number: ");
        num1 = input.nextDouble();

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

        System.out.println("1. Addition");
        System.out.println("2. Subtraction");
        System.out.println("3. Multiplication");
        System.out.println("4. Division");
        System.out.println("5. Square");
        System.out.println("6. Cube");
        System.out.print("Enter your choice: ");
        choice = input.nextInt();

        switch (choice) {
            case 1:
                result = num1 + num2;
                System.out.println("Result: " + result);
                break;
            case 2:
                result = num1 - num2;
                System.out.println("Result: " + result);
                break;
            case 3:
                result = num1 * num2;
                System.out.println("Result: " + result);
                break;
            case 4:
                if (num2 == 0) {
                    System.out.println("Error: Division by zero");
                } else {
                    result = num1 / num2;
                    System.out.println("Result: " + result);
                }
                break;
            case 5:
                result = num1 * num1;
                System.out.println("Result: " + result);
                break;
            case 6:
                result = num1 * num1 * num1;
                System.out.println("Result: " + result);
                break;
            default:
                System.out.println("Invalid choice");
                break;
        }
    }
}

使用时，用户输入两个数字和运算选项，程序根据选项进行相应的计算，并输出结果。