salelist.java

一个出售卡片信息的源码 是我的一个作业

import java.text.NumberFormat;
import java.util.*;

public class SaleList {

  /**
   * list of sale card
   */
  private static LinkedList<Card> saleList = new LinkedList<Card> ();

  /**
   * a card in the list
   */
  private static Card card;

  /**
   * to sale a kind card
   * @param name String
   * @param quantity int
   * @param stuffName String
   * @param price double
   */
  public static void saleCard(String stuffName, String index, int quantity) throws
      Exception {

    card = CardList.getCard(index);
    card.setSalesInfo(quantity,stuffName);
    Card c = new Card(stuffName, index, card.getName(), quantity, card.getPrice());
    saleList.add(c);
  }

  /**
   * get the information of the salelist
   * @return String
   */
  public static String print() {

    String list = "";
    Card c = null;
    if (saleList != null) {
      for (int i = 0; i < saleList.size(); i++) {
        String s;
        if (i < 10) {
          s = "c00" + i;
        }
        else if (i >= 0 && i < 100) {
          s = "c0" + i;
        }
        else {
          s = "c" + i;
        }
        c = saleList.get(i);
        Double fee = c.getQuantity()*c.getPrice();
        NumberFormat f = NumberFormat.getInstance();
		f.setMinimumFractionDigits(2);
        String f1 = f.format(fee);
        list +=
            s + "    " + c.getId() + "  " + c.getStuffName() + "   " +
            c.getQuantity() + "   * $ " +
            c.getPrice() + "   =  $ " + f1 +
            "\r\n";
      }
    }
    return list;
  }

  public static int getSize() {
    return saleList.size();
  }

  /**
   * get the card name in the specified position of the salelist
   * @param i int
   * @return Card
   */
  public static String getSaleCardName(int i) {
    return saleList.get(i).getName();
  }

  /**
   * get the card quantity in the specific position of the salelist
   * @param i int
   * @return int
   */
  public static int getSaleQuantity(String code) {
    int quantity = 0;
    for (int i = 0; i < saleList.size(); i++) {
      Card c = saleList.get(i);
      if (c.getId().equals(code)) {
        quantity += c.getQuantity();
      }
    }
    return quantity;
  }

  /**
   * contains the Card named name YES OR NO
   * @param name String
   * @return boolean
   */
  public static boolean contains(String code) {
    for (int i = 0; i < saleList.size(); i++) {
      if (saleList.get(i).getId().equals(code)) {
        return true;
      }
    }
    return false;
  }
  
  /**
   * Remove card from sale list and return it
   */
  public static Card remove(){
	  return saleList.remove();
  }
}