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Convert an Iterable to Stream in Java

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  • Last Updated : 11 Dec, 2018

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:

  1. Get the Iterable.
  2. Convert the Iterable to Spliterator using Iterable.spliterator() method.
  3. Convert the formed Spliterator into Sequential Stream using StreamSupport.stream() method.
  4. Return the stream.

Below is the implementation of the above approach:




// Java program to get a Stream
// from a given Iterable
  
import java.util.*;
import java.util.stream.*;
  
class GFG {
  
    // Function to get the Stream
    public static <T> Stream<T>
    getStreamFromIterable(Iterable<T> iterable)
    {
  
        // Convert the Iterable to Spliterator
        Spliterator<T>
            spliterator = iterable.spliterator();
  
        // Get a Sequential Stream from spliterator
        return StreamSupport.stream(spliterator, false);
    }
  
    // Driver code
    public static void main(String[] args)
    {
  
        // Get the Iterator
        Iterable<Integer>
            iterable = Arrays.asList(1, 2, 3, 4, 5);
  
        // Get the Stream from the Iterable
        Stream<Integer>
            stream = getStreamFromIterable(iterable);
  
        // Print the elements of stream
        stream.forEach(s -> System.out.println(s));
    }
}

Output:

1
2
3
4
5
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