用scanner编写java计算器

是使用Scanner编写Java计算器的示例代码：

import java.util.Scanner;

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

        while (choice.equalsIgnoreCase("y")) {
            System.out.print("Enter first number: ");
            num1 = scanner.nextDouble();

            System.out.print("Enter operator (+, -, *, /): ");
            operator = scanner.next();

            System.out.print("Enter second number: ");
            num2 = scanner.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 "/":
                    if (num2 == 0) {
                        System.out.println("Error: Division by zero");
                    } else {
                        result = num1 / num2;
                        System.out.println(num1 + " / " + num2 + " = " + result);
                    }
                    break;
                default:
                    System.out.println("Invalid operator");
                    break;
            }

            System.out.print("Do you want to continue? (y/n): ");
            choice = scanner.next();
        }

        scanner.close();
    }
}