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Answer» Both Iterator and Enumeration are interfaces BELONGING to the java.util package. They are used for traversal of collection objects. Although Iterator and Enumeration have the same functionality of traversal, there are quite a few DIFFERENCES between them. Some of the differences are given below: Basis
| Iterator
| Enumeration
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Introduction
| Iterator interface was introduced in JDK 1.2
| Enumeration interface existed since JDK 1.0
| Functions
| Iterator can be used for traversal as well as to remove an element from a given Collection object.
| Enumeration can only perform traversal through the collection object.
| Nature
| Iterator is fail-fast is nature. It throws a ConcurrentModificationException if any modification other than the remove() method is done to the collection while iteration.
| Enumeration is fail-safe in nature. It does not throw any exceptions during modification of the Collection Object during an iteration.
| Legacy
| Classes like ArrayList, HASHSET and HashMap in the collection framework are traversed by Iterator
| Traversal of legacy classes like Vector and Stack is done through Enumeration
| Safety
| Iterator is safer and more robust than Enumeration
| Enumeration is more vulnerable due to its fail-safe nature.
| Methods
| hasNext()
next()
remove()
| hasMoreElements()
NEXTELEMENT()
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