如果我们拥有一个Person对象集合，并且想根据Person的姓氏对列表进行分类，那么我们立即将代码改写如下。

If we had a collection of Person objects, and we wanted to sort that list by the last name of the Person, we would write this today as.

youdao

如果我们拥有一个Person对象集合，并且想根据Person的姓氏对列表进行分类，那么我们立即将代码改写如下。

If we had a collection of Person objects, and we wanted to sort that list by the last name of the Person, we would write this today as.

youdao