Write a program that asks the user for names. 
The given names are added to the list.

However, if the name is already in the list, it is not added again, but an error message is printed to the user. 
When the user enters 'quit', the list of names is printed and the program is terminated.

Example execution:
Give a name: Jack
Hello, Jack
Give a name: Jill
Hello, Jill
Give a name: Jack
Name has already been given
Give a name: Ann
Hello, Ann
Give a name: Jill
Name has already been given
Give a name: quit
Names: [Jack, Jill, Ann]







import java.util.Random;
import java.util.ArrayList;
import java.util.Scanner;



public class Test{
    public static void main(String[] args){
        final Random r = new Random();

        Scanner reader= new Scanner(System.in);                      //marked as correct if placed outside
        ArrayList<String> names = new ArrayList<String>();

        while (true) {
            // Scanner reader= new Scanner(System.in);                // marked as incorrect if placed inside
            System.out.print("Give a name: ");
            String name = String.valueOf(reader.nextLine());

            if (name.equals("quit")) {
                break;
            }

            if (names.contains(name)) {
                System.out.println("Name has already been given");
            } 
            else {
                names.add(name);
                System.out.println("Hello, " + name);
            }
        }
        System.out.println("Names: " + names);
        
        
    }
}









Give a name: Jack
Hello, Jack
Give a name: Jill
Hello, Jill
Give a name: Pete
Hello, Pete
Give a name: Kate
Hello, Kate
Give a name: Ann
Hello, Ann
Give a name: Pete
Name has already been given
Give a name: Jill
Name has already been given
Give a name: Larry
Hello, Larry
Give a name: Kate
Name has already been given
Give a name: Maya
Hello, Maya
Give a name: Maya
Name has already been given
Give a name: Ann
Name has already been given
Give a name: quit
Names: [Jack, Jill, Pete, Kate, Ann, Larry, Maya]