Iterator v/s Enumator

Iterator v/s Enumerator

Often asked during interviews from Collections. They are both used to iterate over a Collection of Data. Below is the difference in tabular format and sufficient for interviews.

Differences
S No.	Iterator	Enumerator
1	Methods hasNext() next() remove()	Methods hasMoreElement() nextElement()
2	Secure as throws ConcurrentModificationException if other thread tries to modify the Collection object while one thread is iterating over it	Not secure as no concept of ConcurrentModificationException
3	remove() method makes it read/modify interface	remove() method is absent, hence it is Read-only interface

Similarities
S No.	Iterator	Enumerator
1	Interface	Interface
2	java.util package	java.util package
3	Used for iteration	Used for iteration