Difference Between Iterator and Enumeration

Both Iterator and Enumeration provide ways to traverse or navigate through entire collection in java.

• Enumeration is older and its there from JDK1.0 while iterator was introduced later. 
• The functionality of Enumeration interface is duplicated by the Iterator interface.
• Only major difference between Enumeration and iterator is Iterator has a remove() method while Enumeration doesn't. Enumeration acts as Read-only interface, because it has the methods only to traverse and fetch the objects, where as by using Iterator we can manipulate the objects like adding and removing the objects from collectione.g. Arraylist.
• Also Iterator is more secure and safe as compared to Enumeration because it does not allow other thread to modify the collection object while some thread is iterating over it and throws ConcurrentModificationException. 
• In Summary both Enumeration and Iterator will give successive elements, but Iterator is new and improved version where method names are shorter, and has new method called remove.