java - When we need Collections class method in Arraylist then why not Collections is extended? -


collections.sort() needed each , every time in arraylist when perform sorting , why not "the great man" has developed arraylist not added collections class extended class !

well may because of following reasons

  1. arraylist extends abstractlist , can extends 1 class in java
  2. all functions of collections static
  3. they not want override methods in case in not static
  4. if 1 argues can converted final non static methods making collections base class of no use.
  5. methods in collections part of job can executed on arraylist , not defines arraylist should do. hence oop point of view i, neither "the great man" have done that.

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