Source of BookCollection.java

Structures and functions

public class BookCollection

  1: //BookCollection.java

  3: import java.util.HashSet;

  5: public class BookCollection
  6: {
  7:     public static void main(String[] args)
  8:     {
  9:         HashSet<String> ownedBooks = new HashSet<String>();

 11:         ownedBooks.add("A Tale of Two Cities");
 12:         ownedBooks.add("The Lord of the Rings");

 14:         System.out.println
 15:         (
 16:             "Contains \"A Tale of Two Cities\": "
 17:             + ownedBooks.contains("A Tale of Two Cities")
 18:         );

 20:         ownedBooks.remove("The Lord of the Rings");

 22:         System.out.println
 23:         (
 24:             "Contains \"The Lord of the Rings\": "
 25:             + ownedBooks.contains("The Lord of the Rings")
 26:         );
 27:     }
 28: }