如何使用Java将此方法的返回值传递给另一个类？

Question

I created a method that returns a row of arrays via user input. I managed to display the set of inputted number on the same class using System.out.println by assigning each value in userDigits.
My question is, how can I pass the same value in another class?

public class LottoTicket extends Ticket {

public int NUM_DIGITS = 5;
public int[] userDigits = new int[NUM_DIGITS];

@Override
public void buyTicket() {
    Scanner input = new Scanner(System.in);

    int number = 0;
    double amount = 0;
    System.out.println("-------=======LOTTO TICKET SCREEN=======--------");
    System.out.println("");
    System.out.println("There are three Types (Prima, Ambo and Terro)");
    System.out.print("Please select one (P, A, T): ");
    String lotteryOption = input.next();

    switch (lotteryOption) {
        case "P": {
            break;
        }
        case "A": {
            break;
        }
        case "T": {

           amount = getAmount(amount);
           getUserData(userDigits);
           int ticketSold;
            ticketSold = +1;
            int tik = ticketSold +1;
            System.out.println(amount);

            System.out.println("Your numbers are:  " + userDigits[0] + " "
                    + userDigits[1] + " " + userDigits[2] + " " + userDigits[3]
                    + " " + userDigits[4] + " ");
            System.out.println("Ticket/s Sold: " + tik);
            System.out.println("Thank you for playing");
            Ticket.pressAnyKeyToContinue();
            LotteryApplication.loginScreen();
            break;
        }
        default: {
            System.out.println("Invalid Input. Please try again.");
            System.out.println("");
            buyTicket();
            break;
        }
    }
}


@Override
public double getAmount(double amount) {
    Scanner input = new Scanner(System.in);
    System.out.print("Please enter amount of money: ");
    amount = input.nextDouble();
    //input.close();
    return amount;
}

@Override
public int getUserData(int[] userInput) {
    Scanner input = new Scanner(System.in);

    System.out.print("Choose a number from 1 to 90: ");
    userDigits[0] = input.nextInt();
    System.out.print("Choose a number from 1 to 90: ");
    userDigits[1] = input.nextInt();
    System.out.print("Choose a number from 1 to 90: ");
    userDigits[2] = input.nextInt();
    System.out.print("Choose a number from 1 to 90: ");
    userDigits[3] = input.nextInt();
    System.out.print("Choose a number from 1 to 90: ");
    userDigits[4] = input.nextInt();

    //key.close();
    //Returns last value of array
    return userDigits[4];
}
//public int userDigits[];
public static void printTicket(){

   // System.out.println(getUserData.userDigits[4]);
   // for (int i = 0; i < array.length)
}

}

Answer 1

Well, in this case, since you defined userDigits as public , you can do it easily - it is accessible to any class that has a visibility to your instance of LottoTicket . With the current setup you could do something like this:

// you need to instantiate LottoTicket somewhere in your app
LottoTicket ticket = new LottoTicket();

// get the input from user
ticket.buyTicket();

// at this point you can access the numbers and pass them to some other method like this
checkNumbers(ticket.userDigits);

The example posted above needs you to provide a method checkNumbers that has, for example, the following signature:

public void checkNumbers(int[] numbers) {
// the comparison code goes here...

Also, this is somewhat unrelated to your question, but I'd like to point out two issues with your current code:

1. defining class fields as public is done rather rarely, more common approach is to define these as private and provide methods for getting/setting the field values; this restricts the operation on these fields to only those you allow - having public field allows anyone who has a visibility to that field to perform basically any operations, which is usually not what you want
2. you call buyTicket() from default in case user didn't select valid lottery type; in extreme cases this could lead to StackOverflowError - better approach would be to use a loop that keeps asking user for input until a valid one is provided

Hope this helps at least a bit.

Answer 2

        You can easily pass input array to method of another class arguments.

    class PassValue{
     public static void display(int[] elements){
      Anotherclass obj= new Anotherclass();
      obj.display2(elements);
    }
    }
   class Anotherclass{

     public void display2(int[] values){

       do whatever you want
    }
   }