Queue in Java

Queue is FIFO(First In First Out) data structure.In which every element insert in the rear end and deleted from front end.
Some method which very helpful during coding on the basis of Queue is following-

boolean offer(Object obj):- This method is used for insert an obj in the rear end of the Queue.If insertion of obj is successful it return true else false.

Object poll():- This method return head(first) element of Queue and also delete it.If no element exist in the Queue it return null.

Object remove():- This method also return head(first) element of Queue and delete it But when no element found in the Queue it return NoSuchElementException.

Object peek():-  This method return head(first) element of Queue but It does not delete it and return null when Queue is Empty.

Object element():- This method also return head(first) element of Queue and does not delete it but when Queue is Empty it return NoSuchElementException.

add() method is also use for insert element in the rear end of the Queue.