Oracle Certified Associate, Java SE 7 Programmer Study Guide by Unknown

Author:Unknown
Language: eng
Format: epub, pdf
Publisher: Packt Publishing

Encapsulating collections

When using a collection within a class, hide the collection to prevent inadvertent modification of the collection. For example, if a class encapsulates an ArrayList of Books, then public methods should be provided to permit access to the collection. In the following example, a class called Library hides an ArrayList of Book objects:

public class Library { private ArrayList<Book> books = new ArrayList<Book>(); public Book getBook(int index) { return books.get(index); } public void addBook(Book book) { books.add(book); } public List getBooks() { return books; } }

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