Working with a switch

[überfuzz]

I'm using a switch statement to handle a process. The method is called handle() and I'm having trouble getting to the right place when I want to end it. It's part of a exercise I did in school a while back. This bank was made to handle one customer in the exercise, now I'd like to expand it to be able to handle multiple customers.

  public void handle()                                          //Metod given av uppgiften.
  {
    int choice;
    Scanner sc = new Scanner(System.in);
    
    while (true)
    {
      System.out.println("");
      System.out.println("******************************************");
      System.out.println("*    Hanterar kund " + customerNumber + " (" + person.getName() + ")" );
      System.out.println("*   (0) Avsluta");
      System.out.println("*   (1) Lista konton");
      System.out.println("*   (2) Skapa konto");
      //etc...
      System.out.print("*   Ditt val: ");
      if (sc.hasNextInt())
      {
        choice = sc.nextInt();
      }
      else
      {
        choice = -1;
      }
      sc.nextLine();  // Läs förbi radslutet
      switch (choice)
      {
        case 0:
          break;    //This is the choice that should end it, or better let the user choose an other customer.
        case 1:
          a_method();
          break;
        case 2:
          an_other_method();
          break;
          //etc...
      }
    }
  }

I run this bank from a main class:

    while(customer != -1)                                                       //Programmet avslutas om användaren väljer -1.
    {
      System.out.println("***********************************************************");            //Skapa en tjusig tabell.
      System.out.println("*   Välj       Kundnr.       Namn");
      System.out.println("***********************************************************");
      int numberCostumers = costumers.length;                                                       //iterera igenom de kunder som finns.
      for(int i = 0; i < numberCostumers; i++)
      {
        System.out.println("*   (" + i + ")        " + costumers[i].getCustomerNumber() + "          "+ costumers[i].getPerson().getName());      //skriv ut kunder i listan
      }
      System.out.println("***********************************************************");            //ge användaren alternativ.
      System.out.println("*   Välj en person att hantera, använd siffrorna under välj.  ");
      System.out.println("*   Avsluta programmet genom att välja -1.  ");
      System.out.println("***********************************************************");
      
      Scanner sc = new Scanner(System.in);                                                        //öppna för scanning.
      System.out.print("Välj kund: ");
      int valdKund = sc.nextInt();                                                                //läs in användarens val.
      customer = valdKund;                                                                        //sätt customer för att se in while-loopen ska fortsätta köras.
      while( (valdKund < 0 ) || (valdKund >= numberCostumers))                                    //Om användaren väljer felaktigt.
      {
        System.out.println("*    Välj bland de kunder som finns med i listan.");
        System.out.print("Välj kund: ");
        valdKund = sc.nextInt();
        if(valdKund == -1)                                                                        //Se till att användaren kan avsluta programmet inne i while-loopen.
        {
          System.out.println("Programmet avslutas");   
          System.exit(0);                                                                         //Testar System.exit(0);
        }
      } 
      costumers[valdKund].handle();                                                               //hantera den valda kunden.

    }

The idea now was to add a while loop that runs the bank as long as customer -1 isn't picked. I'd be thrilled if anyone would help me out.

[Tolls]

Spam reported.

[Eranga]

The idea now was to add a while loop that runs the bank as long as customer -1 isn't picked. I'd be thrilled if anyone would help me out.

You can do it in a do-while loop. Because you've to run the application at least once, or exit at the very beginning. Exit on the first step is straightforward.