cart.java

来自「JAVA Servlet2.3外文书籍源码」· Java 代码 · 共 25 行

package store;

import java.util.*;

public class Cart {

  private HashMap items = new HashMap();

  public Cart() {

  }

  public Iterator getItems() {
    return items.values().iterator();
  }

  public void addItem(Product product) throws ItemAlreadyAddedException {
    Integer id = new Integer(product.getId());
    if (this.items.containsKey(id)) {
      throw new ItemAlreadyAddedException();
    }
    this.items.put(id, product);
  }

}