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In this Collection framework tutorial we will learn what are differences and similarities between java.util.Iterator and java.util.Enumeration in java.

Enumeration and iterator iterates over a collection.

Iterator was introduced to replace Enumeration in the Java Collections Framework.

Differences between java.util.Iterator and java.util.Enumeration in java >

	Property	java.util.Enumeration	java.util.Iterator
1	Remove elements during iteration	java.util.Enumeration doesn’t allows to remove elements from collection during iteration in java.	java.util.Iterator allows to remove elements from collection during iteration by using remove() method in java.
2	Improved naming conventions in Iterator	nextElement() Method Returns the next element of this enumeration if this enumeration object has at least one more element to provide. hasMoreElements() returns true if enumeration contains more elements.	nextElement() has been changed to next() in Iterator. And hasMoreElements() has been changed to hasNext() in Iterator.
3	Introduced in which java version	Enumeration was introduced in first version of java i.e. JDK 1.0	Iterator was introduced in second version of java i.e. JDK 2.0 Iterator was introduced to replace Enumeration in the Java Collections Framework.
4	Recommendation	Java docs recommends iterator over enumeration.	Java docs recommends iterator over enumeration.
5	Enumeration and Iterator over Vector	Enumeration returned by Vector is fail-safe, means any modification made to Vector during iteration using Enumeration don’t throw any exception in java.	Iterator returned by Vector are fail-fast, means any structural modification made to ArrayList during iteration will throw ConcurrentModificationException in java.

Also Read : Collection - List, Set and Map all properties in tabular form in java

So far we have learned what are differences between java.util.Iterator and java.util.Enumeration in java.

Now we will learn similarities between java.util.Iterator and java.util.Enumeration in Collection framework in java.

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Similarities between java.util.Iterator and java.util.Enumeration in java

	Property	java.util.Enumeration and java.util.Iterator
1	iterates over a collection	Enumeration and iterator iterates over a collection in java.
2	Fail-safe and fail-fast	Enumeration and iterator both provides fail-safe and fail-fast iteration in java.

So in this Collection framework tutorial we will learn what are differences and similarities between java.util.Iterator and java.util.Enumeration in java.

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