Avoid duplication in Set or key of the Map
Avoid duplication in Set or key of the Map
object to compare
Create a hashCode to accelerate operations in HashSet or HashMap ect.
Create a hashCode to accelerate operations in HashSet or HashMap ect.
isEqual function
(Since version ) see corresponding Javadoc for more information.
Which class can get an indexed hash the index code should be unique to avoid duplication in Set or other data structures
should have a great randomly hashCode, recommend use Long, Int, avoid using String or Double