如何在Java命令行中创建用户选择菜单?

Question

我想为一个简单的数学游戏创建一个用户选择菜单:

=============================
Create a New User         [1] 
Continue as Existing User [2]
Exit                      [3]
=============================

当用户选择[1]时，游戏将开始，当用户选择[2]时，将显示用户列表，如下所示:

=============================
Select User to Continue As
John  [1]
Rob   [2]
Steve [3]
Back Button [0]
=============================

我怎么能做这样的事情?

Answer 1

1. 打印用户说明(如:System.out.println("Create a New User [1] "))
2. 从控制台获取用户输入(Scanner in = new Scanner(System.in); int menuItem = scan.nextInt();)
3. 比较用户输入与可能情况(switch (menuItem):{case 1: //do your code; break; case 2: //do your code; break;})

Answer 2

//add code to accept choice
System.out.println("n============================="+"nCreate a New 
User         [1]"+
"nContinue as Existing User [2]"+"nExit                      
[3]"+"n=============================");

switch(choice){
case 1:

//call method to create user;
break;
case 2:
//call method to conitnue as existing user
existingUser();
break;
case 3:
//call method to exit
break;
}