Convert an Iterator to Stream in Java

Java Program to Convert Iterator to Spliterator

Last Updated : 23 Oct, 2018

Given an Iterator, the task is to convert it into Spliterators in Java. Examples:

Input: Iterator = {1, 2, 3, 4, 5}
Output: {1, 2, 3, 4, 5}

Input: Iterator = {'G', 'e', 'e', 'k', 's'}
Output: {'G', 'e', 'e', 'k', 's'}

Approach:

Get the Iterator.
Convert the iterator to Spliterator using Spliterators.spliteratorUnknownSize() method.
Return the Spliterator.

Below is the implementation of the above approach:

Java

// Java program to get a Spliterator
// from a given Iterator

import java.util.*;

class GFG {

    // Function to get the Spliterator
    public static <T> Spliterator<T>
    getSpliteratorFromIterator(Iterator<T> iterator)
    {
        return Spliterators
            .spliteratorUnknownSize(iterator, 0);
    }

    // Driver code
    public static void main(String[] args)
    {
        // Get the Iterator
        Iterator<Integer>
            iterator = Arrays.asList(1, 2, 3, 4, 5)
                           .iterator();

        // Get the Spliterator from the Iterator
        Spliterator<Integer>
            si = getSpliteratorFromIterator(iterator);

        // Print the elements of Spliterator
        si.forEachRemaining(System.out::println);
    }
}

Output:

Convert an Iterator to Stream in Java

R

RishabhPrabhu

Improve

Article Tags :

Java

Practice Tags :

Java

Similar Reads

Convert an Iterator to Stream in Java

Given an Iterator, the task is to convert it into Stream in Java. Examples: Input: Iterator = {1, 2, 3, 4, 5} Output: {1, 2, 3, 4, 5} Input: Iterator = {'G', 'e', 'e', 'k', 's'} Output: {'G', 'e', 'e', 'k', 's'} Approach: Get the Iterator. Convert the iterator to Spliterator using Spliterators.split

Convert an Iterator to a List in Java

Given an Iterator, the task is to convert it into List in Java. Examples: Input: Iterator = {1, 2, 3, 4, 5} Output: {1, 2, 3, 4, 5} Input: Iterator = {'G', 'e', 'e', 'k', 's'} Output: {'G', 'e', 'e', 'k', 's'} Below are the various ways to do so: Naive Approach: Get the Iterator. Create an empty lis

Program to Convert List to Map in Java

The List is a child interface of Collection. It is an ordered collection of objects in which duplicate values can be stored. Since List preserves the insertion order, it allows positional access and insertion of elements. List Interface is implemented by ArrayList, LinkedList, Vector and Stack class

Java.util Interface Spliterator in Java8

Prerequisite : Iterators in java Spliterators, like other Iterators, are for traversing the elements of a source. A source can be a Collection, an IO channel or a generator function. It is included in JDK 8 for support of efficient parallel traversal(parallel programming) in addition to sequential t

Enumeration vs Iterator vs ListIterator in Java

Enumeration is an interface. It is used in the collection framework in java to retrieve the elements one by one. Enumeration is a legacy interface that is applicable only for legacy classes like Vector, HashTable, Stack, etc. It provides a single direction iteration. By using enumeration, we can per

Convert Iterator to Iterable in Java

Given an Iterator, the task is to convert it into Iterables in Java. Examples: Input: Iterator = {1, 2, 3, 4, 5} Output: {1, 2, 3, 4, 5} Input: Iterator = {'G', 'e', 'e', 'k', 's'} Output: {'G', 'e', 'e', 'k', 's'} Below are the various ways to do so: By overriding the abstract method Iterable.itera

Program to Iterate over a Stream with Indices in Java 8

Given a Stream in Java, the task is to iterate over it with the help of indices. Examples: Input: Stream = [G, e, e, k, s] Output: [0 -> G, 1 -> e, 2 -> e, 3 -> k, 4 -> s] Input: Stream = [G, e, e, k, s, F, o, r, G, e, e, k, s] Output: [0 -> G, 1 -> e, 2 -> e, 3 -> k, 4 -> s, 5 -> F, 6 -> o, 7 -> r,

Convert an Iterable to Stream in Java

Given an Iterable, the task is to convert it into Stream in Java. Examples: Input: Iterable = [1, 2, 3, 4, 5] Output: {1, 2, 3, 4, 5} Input: Iterable = ['G', 'e', 'e', 'k', 's'] Output: {'G', 'e', 'e', 'k', 's'} Approach: Get the Iterable. Convert the Iterable to Spliterator using Iterable.spliterat

CopyOnWriteArrayList spliterator() method in Java

The spliterator() method of CopyOnWriteArrayList returns an spliterator over the elements in this list in proper sequence. There is no need of synchronization while operating on the spliterator. Syntax: public Spliterator spliterator() Parameters: The function does not accept any parameters. Return

CopyOnWriteArraySet spliterator() method in Java

The spliterator() method of CopyOnWriteArraySet returns an spliterator over the elements in this Set in proper sequence. There is no need of synchronization while operating on the spliterator. Syntax: public Spliterator spliterator() Return Value: The function returns an spliterator over the element