java - IS-A and HAS-A relationship occur together in OOPS -


in java every class child of object. class is-a object. if contains data member of object type (actually type in case), has-a relationship. related above statement have following doubts. 1. there name relationship, is-a , has-a coming together? 2. there real world example it? 3. oops perspective, okay have relationship or should avoided?

  1. is there name relationship, is-a , has-a coming together?

no.

  1. are there real world example it? 
list<set> alistthatcontainssets

list , set both collections. in example list has bunch of sets.

  1. from oops perspective, okay have relationship or should avoided?

yes fine. can has-a yourself.

public class myclass{       myclass me;  }

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