What is the Difference Between Iterator and Enumeration

In Iterator, we can read and remove element while traversing element in the collections. Using Enumeration, we can only read element during traversing element in the collections. 2. It can be used with any class of the collection framework.

1. What is the difference between enumeration and iterator interface?
2. Which is faster enumeration or iterator?
3. What is the difference between iterator and list iterator?
4. What is difference between enum and enumeration?
5. What is enumeration definition?
6. Is enumeration fail fast?
7. What is enumerator in Java?
8. Can elements of a set be traversed without using iterator?
9. What is the difference between equals () and == in Java?
10. What iterator can throw a ConcurrentModificationException?
11. Can iterator traverse a collection in both directions?
12. What implementation of iterator can traverse a collection in both direction?

What is the difference between enumeration and iterator interface?

The main difference between Iterator and Enumeration is that Iterator is a universal cursor, can be used for iterating any collection object. On the other hand, the Enumeration is used for traversing object of legacy class only. Enumeration object has only read-only access to the elements in the collection.

Which is faster enumeration or iterator?

Enumeration is used to traverse the legacy classes like Vector, Stack and HashTable. Iterator is used to iterate most of the classes in the collection framework like ArrayList, HashSet, HashMap, LinkedList etc. ... Iterator is fail-fast in nature. Enumeration is not safe and secured due to it's fail-safe nature.

What is the difference between iterator and list iterator?

Iterator vs ListIterator. 1) Iterator is used for traversing List and Set both. We can use ListIterator to traverse List only, we cannot traverse Set using ListIterator. ... Using ListIterator, we can traverse a List in both the directions (forward and Backward).

What is difference between enum and enumeration?

Enumeration is an interface : An object that implements the Enumeration interface generates a series of elements, one at a time. ... enum is a data type: An enum type is a special data type that enables for a variable to be a set of predefined constants.

What is enumeration definition?

1 : the act or process of making or stating a list of things one after another the rebel leader's effective enumeration of popular grievances also : the list itself The restaurant creates an astonishing range of preserved products …

Is enumeration fail fast?

Fail-fast or Fail-safe : Enumeration is fail-safe in nature. ... Iterator is fail-fast in nature. It throws ConcurrentModificationException if a Collection is modified while iterating other than its own remove() method.

What is enumerator in Java?

Enumeration means a list of named constant. In Java, enumeration defines a class type. An Enumeration can have constructors, methods and instance variables. It is created using enum keyword. Each enumeration constant is public, static and final by default.

Can elements of a set be traversed without using iterator?

Can elements of a Set be traversed without using Iterator? It is possible to Iterate a Set using the normal for loop.

What is the difference between equals () and == in Java?

equals() method for content comparison. In simple words, == checks if both objects point to the same memory location whereas . equals() evaluates to the comparison of values in the objects.

What iterator can throw a ConcurrentModificationException?

Fail-Fast iterators immediately throw ConcurrentModificationException if there is structural modification of the collection. Structural modification means adding, removing any element from collection while a thread is iterating over that collection.

Can iterator traverse a collection in both directions?

Iterator can traverse only in forward direction whereas ListIterator traverses both in forward and backward directions. ListIterator can help to replace an element whereas Iterator cannot. Can traverse elements present in Collection only in the forward direction.

What implementation of iterator can traverse a collection in both direction?

On the other hand, ListIterator must be used when we want to enumerate elements of List. The object of ListIterator can be created by calling listIterator() method present in List interface. List iterator could traverses both in forward and backward directions which makes data traverse in both directions.