bookshelf.java

<设计模式-Java语言中的应用> 的源码

import java.util.Vector;

public class BookShelf implements Aggregate {
    private Vector books;   
    public BookShelf(int initialsize) {         
        this.books = new Vector(initialsize);   
    }
    public Book getBookAt(int index) {
        return (Book)books.get(index);
    }
    public void appendBook(Book book) {
        books.add(book);
    }
    public int getLength() {
        return books.size();                    
    }
    public Iterator iterator() {
        return new BookShelfIterator(this);
    }
}