What is difference between iterator and ListIterator?

An Iterator is an interface in Java and we can traverse the elements of a list in a forward direction whereas a ListIterator is an interface that extends the Iterator interface and we can traverse the elements in both forward and backward directions.

What is the difference between Enumeration and iterator in collection?

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.

What is difference between iterator and Splititerator?

Iterator performs only iteration over a set of elements. But, Spliterator splits as well as iterates over a set of elements which is very useful in parallel processing of elements.

What is ListIterator in Java?

The ListIterator interface of the Java collections framework provides the functionality to access elements of a list. It is bidirectional. This means it allows us to iterate elements of a list in both the direction. It extends the Iterator interface.

What is a Spliterator in Java?

An object for traversing and partitioning elements of a source. The source of elements covered by a Spliterator could be, for example, an array, a Collection , an IO channel, or a generator function. A Spliterator may traverse elements individually ( tryAdvance() ) or sequentially in bulk ( forEachRemaining() ).

Difference between iterator and listiterator in java |iterator vs listiterator

What is Iterator and Enumeration?

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. Methods : hasMoreElements() and nextElement() Methods : hasNext(), next() and remove()

What is difference between enum and Enumeration?

Although the enumerations define a class Enum and the constructors as well, they do not use a new keyword. We can use the enumerators defined in the same way as the primitive. Enum is a generic class and all the enumerations inherit Enum.

What is difference between vector and ArrayList?

ArrayList is non-synchronized. Vector is synchronized. ArrayList increments 50% of its current size if element added exceeds its capacity. Vector increments 100% of its current size if element added exceeds its capacity.

Why ArrayList is non synchronized?

ArrayList is non synchronized because if ArrayList is synchronized then only one thread can work on ArrayList at a time and rest of all threads cannot perform other operations on the ArrayList until the first thread release the lock. This causes overhead and reduces performance. This applies for all collections.

What is difference between list and Set?

List is an ordered sequence of elements whereas Set is a distinct list of elements which is unordered. List <E>: An ordered collection (also known as a sequence). The user of this interface has precise control over where in the list each element is inserted.

What is difference between ArrayList and LinkedList?

ArrayList internally uses a dynamic array to store its elements. LinkedList uses Doubly Linked List to store its elements. ArrayList is slow as array manipulation is slower. LinkedList is faster being node based as not much bit shifting required.

What is difference between enum and interface?

Interfaces are designed to define common behaviours, enums to define common values. Enum represents a real value which can be compared to another value, or stored in the database easily.

Is enum and enumerator same?

In computer programming, an enumerated type (also called enumeration, enum, or factor in the R programming language, and a categorical variable in statistics) is a data type consisting of a set of named values called elements, members, enumeral, or enumerators of the type.

Why do we use Enumeration?

Enumerations make for clearer and more readable code, particularly when meaningful names are used. The benefits of using enumerations include: Reduces errors caused by transposing or mistyping numbers. Makes it easy to change values in the future.

Is enumerate an Iterator?

enumerate() is an iterator, so attempting to access its values by index raises a TypeError .

What is difference between fail-fast and fail-safe?

The Major difference between Fail Fast and Fail Safe iterator is that the Fail Safe does not throw any ConcurrentModificationException in modifying the object during the iteration process, contrary to fail fast, which throws an exception in such scenarios.

What is the correct difference between HashMap and TreeMap?

HashMap allows a single null key and multiple null values. TreeMap does not allow null keys but can have multiple null values. HashMap allows heterogeneous elements because it does not perform sorting on keys. TreeMap allows homogeneous values as a key because of sorting.

What is the difference between typedef and enum?

enum defines a type name automatically, While in case of typedef we define a new data type which may be of any kind of data type so that we do not have declare it explicitly everytime.

Is enumeration interface or not?

Enumeration interface is one of the predefined interfaces, whose object is used for retrieving the data from collections framework variable( like Stack, Vector, HashTable etc.) in a forward direction only and not in the backward direction. This interface has been superceded by an iterator.

Is enum a data type?

An enum type is a special data type that enables for a variable to be a set of predefined constants. The variable must be equal to one of the values that have been predefined for it.

Is enum class A interface?

Yes, Enum implements an interface in Java, it can be useful when we need to implement some business logic that is tightly coupled with a discriminatory property of a given object or class. An Enum is a special datatype which is added in Java 1.5 version.

Can enum extends class in Java?

Inheriting an enum Class from Another Class

We cannot extend enum classes in Java. It is because all enums in Java are inherited from java. lang.

What is difference between enum and class in Java?

An enum can, just like a class , have attributes and methods. The only difference is that enum constants are public , static and final (unchangeable - cannot be overridden). An enum cannot be used to create objects, and it cannot extend other classes (but it can implement interfaces).

Why ArrayList is faster than LinkedList?

Reason: ArrayList maintains index based system for its elements as it uses array data structure implicitly which makes it faster for searching an element in the list. On the other side LinkedList implements doubly linked list which requires the traversal through all the elements for searching an element.