如何用新值替换现有值

问题描述 投票:0回答:2

如果名字已经存在,那么我想为该特定人员替换NetWOrth的值,而不必重复旧的值。

我在遍历列表时尝试这样做,但它给了我重复的输入。

List<Celebrity> list = new CopyOnWriteArrayList<Celebrity>();

protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    response.setContentType("text/html");

    Celebrity cl = new Celebrity("Frank", "Sinatra", "[email protected]", 1000000.00);
    Celebrity c2 = new Celebrity("Michal", "Jackson", "king of [email protected]", 1000000000.00);
    Celebrity c3 = new Celebrity("Aaron", "Hoffman", "[email protected]", 10000.00);

    list.add(cl);
    list.add(c2);
    list.add(c3);

    String firstName = request.getParameter("first");
    String lastName = request.getParameter("last");
    String email = request.getParameter("email");
    double netWorth = Double.parseDouble(request.getParameter("netWorth"));


    for (int i = 0; i < list.size(); i++) {
        if (list.get(i).getEmail().equalsIgnoreCase(firstName)) {
            list.get(i).setNetWorth(netWorth);
        }

        if (!list.get(i).getFirstName().equalsIgnoreCase(firstName)) {
            list.add(new Celebrity(firstName, lastName, email, netWorth));
            break;
        }
    }
}
java servlets
2个回答
0
投票

我不明白您为什么将电子邮件与姓氏进行比较:

 ...
        if (list.get(i).getEmail().equalsIgnoreCase(firstName)) {
         ...

如果我正确理解,这可能是您的问题的解决方案:

  for(Celebrity  ce:list){
  if (ce.getFirstName().trim().equalsIgnoreCase(firstName.trim()) &&ce.getNetworth!=netWorth){
    ce.setNetworth(networth);
    break;
  }
}

0
投票

我认为您的代码非常混乱,但是似乎“中断”未放置在正确的位置。如果要更新属性(uf,我不喜欢可变对象,但这是我的看法),然后停止,只需将“ break”移动到第一个“ if”

如果(list.get(i).getEmail()。equalsIgnoreCase(firstName))

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