java 总结

weixin_34109408

于 2013-12-21 08:07:00 发布

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原文链接：http://www.cnblogs.com/leetcode/p/3484783.html

equals vs ==
 
equals : always remember to override hashCode if you override equals so as not to "break the contract".  if equals. the hashCode must be same.

== :  it returns true if both variables refer to the same object, if their references are one and the same.

why in the abstract class, can not have static , native, synchronized methods 

static : Because "abstract" means: "Implements no functionality", and "static" means: "There is functionality even if you don't have an object instance". And that's a logical contradiction.


native:

转载于:https://www.cnblogs.com/leetcode/p/3484783.html