Asksearch_php.cn

Community Learn Tools Library Leisure

English

Popular searches：
PHP
MySQL
jquery
HTML
CSS

java - What is the role of the afterNodeInsertion method in HashMap?

Environment: jdk1.8 Problem: When learning HashMap, I found that the afterNodeInsertion method {code...} was called at the end of the putVal method. I searched for the afterNodeInsertion method again and found that it was called in many places, but its implementation was { Code...} An empty method? ...

仅有的幸福 2017-05-17 10:03:41

java - Why does HashMap both inherit AbstractMap and implement the Map interface?

We know that AbstractMap has already implemented the Map interface. Why does HashMap need to implement the Map interface one more time? Even if I remove the Map interface from the source code, no error will be reported. What is the reason for this?

巴扎黑 2017-05-17 09:59:01

java - Doubts about indexFor(int h, int length) in HashMap

{Code...} In HashMap, the hash value of the key and the size of the Entry[] array are hashed to obtain the subscript position of the Entry array. I just found out during debugging that there are 2 different keys (with different hash values), but The index subscripts obtained through indexFor are the...

迷茫 2017-05-17 09:59:13