java - for循环中创建对象

Question

下面这两种for循环中新建对象写法有什么区别呢？
第一种：

list<User> users = new ArrayList<User>();
User user = null;
for (int i = 0; i < 10; i++) {
    user = new User();
    user.setUserId(i);
    user.setUserName("segment" + i);
    users.add(user);
}
……

第二种:

list<User> users = new ArrayList<User>();
for (int i = 0; i < 10; i++) {
    User user = new User();
    user.setUserId(i);
    user.setUserName("segment" + i);
    users.add(user);
}
……

这两种写法对集合users中的内容有影响吗，还是只是性能上有区别？

Answer 1

There is a difference between these two, and the execution results are different
Please refer to the following article:
http://ocaicai.iteye.com/blog...