创建一个菜单应用

1import java.util.Scanner;
2
3public class Main {
4    public static void main(String[] args) {
5        Scanner input = new Scanner(System.in);
6        int choice = 0;
7
8        while (choice != 3) {
9            System.out.println("\n主菜单");
10            System.out.println("1. 问候");
11            System.out.println("2. 讲个笑话");
12            System.out.println("3. 退出");
13            System.out.print("请选择一个选项: ");
14
15            choice = input.nextInt();
16            input.nextLine(); // 清除换行符
17
18            switch (choice) {
19                case 1:
20                    System.out.println("你好，用户！");
21                    break;
22                case 2:
23                    System.out.println("为什么Java开发者不戴眼镜？因为他们不用C#！");
24                    break;
25                case 3:
26                    System.out.println("再见！");
27                    break;
28                default:
29                    System.out.println("无效选择，请重试。");
30            }
31        }
32
33        input.close();
34    }
35}

1import java.util.Scanner;
2
3public class Main {
4    public static void main(String[] args) {
5        Scanner input = new Scanner(System.in);
6        int choice = 0;
7
8        while (choice != 3) {
9            System.out.println("\n主菜单");
10            System.out.println("1. 问候");
11            System.out.println("2. 讲个笑话");
12            System.out.println("3. 退出");
13            System.out.print("请选择一个选项: ");
14
15            choice = input.nextInt();
16            input.nextLine(); // 清除换行符
17
18            switch (choice) {
19                case 1:
20                    System.out.println("你好，用户！");
21                    break;
22                case 2:
23                    System.out.println("为什么Java开发者不戴眼镜？因为他们不用C#！");
24                    break;
25                case 3:
26                    System.out.println("再见！");
27                    break;
28                default:
29                    System.out.println("无效选择，请重试。");
30            }
31        }
32
33        input.close();
34    }
35}