java - 如何用新值替换现有值

Question

如果名字已经存在，那么我想替换该特定人的 NetWOrth 值，而不重复旧值。

我在循环列表时尝试这样做，但它给了我一个重复的条目。

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", "franks.inatra@smoothjazz.com", 1000000.00);
    Celebrity c2 = new Celebrity("Michal", "Jackson", "king of pop@mtv.com", 1000000000.00);
    Celebrity c3 = new Celebrity("Aaron", "Hoffman", "jamsonreal@smoothjazz.com", 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;
        }
    }
}

Answer 1

我不明白为什么你将电子邮件与名字进行比较:

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

如果我理解正确的话，这可能是您问题的解决方案:

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