shoppingcart.java

使用servlet写的简单网上书店

package entity;

import java.util.Vector;

public class ShoppingCart {	
//泛型???????????????Vector<Book>
	private Vector<Book> vector;  //容纳数据对象的集合
	public ShoppingCart() {		
		this.vector = new Vector<Book>();		
	}
	
	public void addBook(Book book){		
		  vector.add(book); 			
	}
	
	public int getCount(){		
		return vector.size();		
	}
	
	public Book[] showAllBooks(){		
		Book[] books = new Book[vector.size()];
	    int i=0;
		for(Book book:vector){			
			books[i]=book;
			i++;			
		}		
		return books;		
	}
}