我有一个用于订单的哈希图和另一个用于订单项的哈希图。将数据放入哈希图中的方法如下执行:
// THIS ONE ADDS THE ORDERS
// (int orderNumber, String Datum, String salesperson, int customernumber)
mainController.addBestallning(500, "2012/01/01", "Hendrik Gustafsson", 1001);
// THIS ONE ADDS THE ORDERED ITEMS
// (int orderNumber, int linePos, Artikel product, int amount, double price)
mainController.addBestallningsOrderRad(500, 1, mainController.getAllaArtiklar().get(101), 5, 100.00);
通过订单号找到订单后,如何找到已订购的商品?我现在唯一的链接是 ordernumber,我保存在 orderitemshashmap 中,所以我假设需要进行某种迭代,找到匹配项并返回结果。
我尝试这样做并让它工作,但前提是所有订单项位置也是唯一的。
所以,如果我要添加另一个这样的订单:
mainController.addBestallning(501, "2011/05/02", "Sven Karmageddon", 1002);
mainController.addBestallningsOrderRad(501, 1, mainController.getAllaArtiklar().get(101), 5, 100.00);
我找不到订单 501 的订单项。
这是我到目前为止所尝试的。制作了一种查找客户所有订单的方法:
public HashMap<Integer, Bestallning> getAllaKundOrdrar() {
HashMap<Integer, Bestallning> allaKundOrderHashMap = new HashMap<>();
//iterate through all orders
//find the ones which belong to customerid
//place them in allaKundOrderHashMap
//return allaKundOrderHashMap
Iterator iter = tmpBestallningsregister.getAllaBestallningar().keySet().iterator();
while (iter.hasNext()) {
Integer key = (Integer) iter.next();
//String value = (String) controller.getAllaKunder().get(key).getKundNamn();
if ((customerNrToFindOrdersFor) == getAllaBestallningar().get(key).getKundNr()) {
//found an order for this customer, putting it in the hashmap
allaKundOrderHashMap.put(key, getAllaBestallningar().get(key));
}
}
return allaKundOrderHashMap;
}
一种从所有客户那里查找所有已订购商品的方法(我知道,像这样搜索是 100% 错误)并获取属于特定订单的商品:
//RETURN OF ORDERRADERS HASHMAP FOR SPECIFIC ORDER VIA ORDERREGISTER
public HashMap<Integer, BestallningsOrderRad> getAllaBestallningsBestallningsOrderRader() {
HashMap<Integer, BestallningsOrderRad> allaBestallningsOrderRaderHashMap = new HashMap<>();
//iterate through all orderrader
//find the ones which belong to orderid
//place them in allaKundOrderRaderHashMap
//return allaKundOrderRaderHashMap
Iterator iter = tmpBestallningsregister.getAllaBestallningsOrderRader().keySet().iterator();
while (iter.hasNext()) {
Integer key = (Integer) iter.next();
if ((orderNrToFindOrderRaderFor) == tmpBestallningsregister.getAllaBestallningsOrderRader().get(key).getBestallningsNr()) {
//found an orderrad for this order, putting it in the hashmap
//allaBestallningsOrderRaderHashMap.put(key, getAllaBestallningsOrderRader().get(key));
allaBestallningsOrderRaderHashMap.put(key, getAllaBestallningsOrderRader().get(key));
}
}
return allaBestallningsOrderRaderHashMap;
}
有人愿意告诉我我做错了什么吗?我已经连续20个小时了...