What is the difference between Iterator and enumerator?
Iterator can do modifications (e.g using remove() method it removes the element from the Collection during traversal). Enumeration interface acts as a read only interface, one can not do any modifications to Collection while traversing the elements of the Collection. Iterator is not a legacy interface.
Is enumerator fail-safe?
Fail-fast or Fail-safe : Enumeration is fail-safe in nature. It does not throw ConcurrentModificationException if Collection is modified during the traversal. Iterator is fail-fast in nature. It throws ConcurrentModificationException if a Collection is modified while iterating other than its own remove() method.
What is the difference between enum and Enumeration in Java?
enum is a syntactic sugar that allows for meaningful constants; Enumeration is a class that provides way to go through a collection. @Amadan Is Enumeration a class or interface.
Which is faster Enumeration or iterator?
Iterator is used to iterate most of the classes in the collection framework like ArrayList, HashSet, HashMap, LinkedList etc. Enumeration is fail-safe in nature. Iterator is fail-fast in nature. Enumeration is not safe and secured due to it’s fail-safe nature.
Can you iterate through an enum Java?
Enums don’t have methods for iteration, like forEach() or iterator(). Instead, we can use the array of the Enum values returned by the values() method.
Why enumeration is faster than Iterator?
In the example of the micro-benchmark given, the reason the Enumeration is faster than Iterator is because it is tested first. 😉 The longer answer is that the HotSpot compiler optimises a whole method when a loop has iterated 10,000 times.
Why enumeration is used in Java?
Enums are used when we know all possible values at compile-time, such as choices on a menu, rounding modes, command-line flags, etc. It is not necessary that the set of constants in an enum type stay fixed for all time. In Java (from 1.5), enums are represented using enum data type.
Why Enumeration is faster than Iterator?
What is enumerator method in Java?
Java Collections enumeration() Method The enumeration() is a method of Java Collections class which is used to get the enumeration over the specified collection.
Which Iterator is fail-safe?
The Fail Safe iterators use a copy of the collection to traverse over the elements. Unlike the Fail Fast, they require more memory as they cloned the collection. The examples of Fail Safe iterators are ConcurrentHashMap, CopyOnWriteArrayList, etc.