Source of BooksSet.java

Structures and functions

public class BooksSet

  1: //BooksSet.java

  3: import java.util.Scanner;
  4: import java.util.HashSet;

  6: public class BooksSet
  7: {
  8:     public static void main(String[] args)
  9:     {
 10:         Scanner scnr = new Scanner(System.in);
 11:         HashSet<String> books = new HashSet<String>();
 12:         String userInput;

 14:         userInput = scnr.nextLine();
 15:         while (userInput.compareTo("done") != 0)
 16:         {
 17:             if (books.add(userInput))
 18:             {
 19:                 System.out.println("a");
 20:             }
 21:             else
 22:             {
 23:                 System.out.println("n");
 24:             }
 25:             userInput = scnr.nextLine();
 26:         }

 28:         System.out.println("Size: " + books.size());
 29:     }
 30: }