需要帮助创建一个循环，允许用户与菜单交互，直到他们发出想要退出系统的信号。 (爪哇)

Question

For the life of me I cannot figure out how to start creating this while loop to do what they are asking. It tells me to "add loop and code here that accepts and validates user input and takes the appropriate action. include appropriate user feedback and re-display the menu as needed." The menu that the user will choose from is as follows:

[1] Add Ship          [A] Print Ship Name
[2] Edit Ship         [B] Print Ship In Service List
[3] Add Cruise        [C] Print Ship Full List
[4] Edit Cruise       [D] Print Cruise List
[5] Add Passenger     [E] Print Cruise Details
[6] Edit Passenger    [F] Print Passenger List
[x] Exit System

The code goes within the main method shown below:

public static void main(String[] args) {

    initializeShipList();       // initial ships
    initializeCruiseList();     // initial cruises
    initializePassengerList();  // initial passengers

    // add loop and code here that accepts and validates user input
    // and takes the appropriate action. include appropriate
    // user feedback and redisplay the menu as needed


}

Answer 1

I hope you need something like this, here you will perform a specific task based on input provided and once current task done, ask user to do something more till your program will not receive signal("x") to exit.

public static void main(String args[]){

        System.out.print("[1] Add Ship          [A] Print Ship Name\r\n" + 
            "[2] Edit Ship         [B] Print Ship In Service List\r\n" + 
            "[3] Add Cruise        [C] Print Ship Full List\r\n" + 
            "[4] Edit Cruise       [D] Print Cruise List\r\n" + 
            "[5] Add Passenger     [E] Print Cruise Details\r\n" + 
            "[6] Edit Passenger    [F] Print Passenger List\r\n" + 
            "[x] Exit System" + "\r\nEnter your choice from the above menu:" 
            );
        Scanner sc = new Scanner(System.in);
        String choice = sc.nextLine();

        while(!choice.equals('x')){
            switch(choice){
                case "1":{
                   initializeShipList(); //Code for adding the Ship
                   System.out.println("test");  
                   break; 
                }
                case "2":{
                   editShipList();//Code for editing the Records
                   break;
                }
                case "3":{
                   initializeCruiseList//Code for editing the Records
                   break;
                }
                //here other option and so on..

                case "A":{
                   //Code for Print ship name 
                   break;
                }
                //here other option and so on..

                case "x":{
                   System.exit(0); 
                }
            }

            System.out.print("Do something more? Please select option: ");
            choice = sc.nextLine();
        }
}

Answer 2

Use this:

Scanner sc=new Scanner(System.in);
String input=sc.nextLine();
while(!input.equals('x')){
        // do your stuff
}