如何从表单中向一个arraylist添加多个对象？ [英] How do I add multiple object to an arraylist from a form?

问题描述

我有一个名为User的类和一个arrayList

I have a class called User and a arrayList

ArrayList<User> users = new ArrayList<>();

我已经在这样的一个用户中添加：

I have already put in one user like this:

User newUser = new User("sunn", "1998");
            User.users.add(newUser);

但是我会从你可以填写的表格中获得下一个用户出。

But then I will get the next users from a form you can fill out.

User newUser = new User(username, year);

User.users.add(newUser);

无法使用标识符newUser每次，但如何为未知数量的用户创建标识符？我真的希望标识符与用户名相同，但我该怎么做？



我尝试过的事情：

It is not possible to use the identifier newUser everytime, but how can I make a identifier to a unknow amount of users? I would really like to have the identifier as the same as the username, but how do I do this?

What I have tried:

User newUser = new User(username, year);

User.users.add(newUser);

无法使用标识符newUser每次，但如何为未知数量的用户创建标识符？我真的希望标识符与用户名相同，但我该怎么做？

It is not possible to use the identifier newUser everytime, but how can I make a identifier to a unknow amount of users? I would really like to have the identifier as the same as the username, but how do I do this?

推荐答案

为什么不可能？这样做非常有效：

Why is it not possible? It is quite valid to do this:

User newUser;
while (some condition) {
    newUser = new User(username, year);
    User.users.add(newUser);
}

// or you could do

while (some condition) {
    User.users.add(new User(username, year));
}

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