作者: 张天天 时间: 2012-7-10 22:19
首先第一个问题,关于equals方法文档里说的非常清楚:
Note that it is always safe not to override Object.equals(Object). However, overriding this method may, in some cases, improve performance by allowing programs to determine that two distinct comparators impose the same order.
不用重写equals方法也是可以的