Java 8 - Iterator forEachRemaining

Java 8 introduced a new method to Iterator called forEachRemaining. This method takes a Consumer, which represents an operation that acceps a single input argument and returns no result.

Here's one way we used to iterate over a collection before this method was introduced:

public class Main {

    public static void main (String[] args){

        List<String> cars = new ArrayList<>();

        cars.add("Honda");

        cars.add("Toyota");

        cars.add("Ford");

        cars.add("Subaru");

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

        while (iterator.hasNext()) {

            System.out.println(iterator.next());

        }

}

With forEachRemaining, we can now perform the equivalent logic with a single line of code like so:

public class Main {

    public static void main (String[] args){

        List<String> cars = new ArrayList<>();

        cars.add("Honda");

        cars.add("Toyota");

        cars.add("Ford");

        cars.add("Subaru");

        cars.iterator().forEachRemaining((car) -> System.out.println(car));}

}

Here's a link to our GitHub location to access an example of using the Iterator forEachRemaining operation: https://github.com/daveschickconsulting/java_8_examples/tree/main/src/funwithforeachremaining