Difference Between Iterator And Enumeration In Java
distinguishing between iterator and enumeration in java
Difference Between Iterator And Enumeration In Java
In Java, Iterator and Enumeration are both interfaces used to traverse through collections such as lists and maps. However, Iterator is more powerful and versatile compared to Enumeration. Iterator allows the programmer to remove elements while iterating through a collection using its remove() method, whereas Enumeration does not provide this functionality. Additionally, Iterator has more useful methods such as hasNext() and next() for easy iteration, whereas Enumeration has only two methods: hasMoreElements() and nextElement(). Overall, Iterator is preferred over Enumeration in modern Java programming due to its additional functionality and flexibility.
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1 - The key difference between an iterator and an enumeration in Java is that an iterator is a more robust and powerful interface than an enumeration. Iterators were introduced in Java 2, while enumerations were part of the original Java release.
2) Iterators allow for both read and remove operations, while enumerations only support read operations. This means that iterators provide more flexibility in terms of modifying the elements of a collection.
3) Iterators are fail fast, which means they throw a ConcurrentModificationException if the collection is modified while iterating over it. Enumerations, on the other hand, do not have this feature and may lead to unexpected behavior if the collection is modified during iteration.
4) Iterators are also more extensible and can be used with a wider range of collection types, including lists, sets, and maps. Enumerations are mainly used with legacy classes like Vector and Hashtable.
5) Iterators also provide additional methods such as remove(), which allows elements to be removed from a collection during iteration. Enumerations do not support this operation.
6) Iterators offer improved performance compared to enumerations, especially for larger collections, due to their enhanced functionality and fail fast behavior.
7) In modern Java programming, iterators are preferred over enumerations as they provide more control, flexibility, and functionality in working with collections.
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