Java 8: Convert Iterator to Stream Examples

To Convert an Iterator to a Stream using Java 8 we can make use of the StreamSupport.stream() method from the java.util.stream package.

Example:

Iterator<String> iterator = collectionObject.iterator();

//Iterator to Stream
Stream<String> stream = StreamSupport.stream(
         Spliterators.spliteratorUnknownSize(iterator, Spliterator.ORDERED), false);

Code Example:

package org.code2care.java.examples;

import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import java.util.Spliterator;
import java.util.Spliterators;
import java.util.stream.Stream;
import java.util.stream.StreamSupport;

public class Java8IteratorToStream {

    public static void main(String[] args) {

        List<String> listOfCountries = new ArrayList<>();
        listOfCountries.add("USA");
        listOfCountries.add("Canada");
        listOfCountries.add("Australia");
        listOfCountries.add("China");
        listOfCountries.add("India");

        Iterator<String> iterator = listOfCountries.iterator();

        Stream<String> stream = StreamSupport.stream(
                Spliterators.spliteratorUnknownSize(iterator, Spliterator.ORDERED), false);

        stream.forEach(System.out::println);
    }

}

Output: