How to convert Iterable to Collection in java

How to convert Iterable to Collection in java

In Java, you can convert an Iterable to a Collection by creating a new Collection (e.g., ArrayList, LinkedList, or another implementation) and adding the elements from the Iterable to the Collection. Here's how you can do it:

import java.util.ArrayList; import java.util.Collection; import java.util.Iterator; public class IterableToCollectionExample { public static void main(String[] args) { // Create an Iterable (e.g., an ArrayList) Iterable<String> iterable = new ArrayList<>(List.of("one", "two", "three")); // Convert Iterable to a Collection (ArrayList in this example) Collection<String> collection = iterableToCollection(iterable); // Print the elements in the Collection for (String element : collection) { System.out.println(element); } } public static <T> Collection<T> iterableToCollection(Iterable<T> iterable) { Collection<T> collection = new ArrayList<>(); // Iterate over the elements in the Iterable and add them to the Collection for (T element : iterable) { collection.add(element); } return collection; } }

In this example:

  1. We have an Iterable named iterable containing strings.

  2. We create a generic method iterableToCollection that takes an Iterable<T> as input and returns a Collection<T>. Inside this method, we create a new Collection (an ArrayList in this case) and iterate over the elements in the Iterable, adding them to the Collection.

  3. We call the iterableToCollection method to convert the Iterable to a Collection.

  4. Finally, we iterate over the elements in the Collection and print them.

You can use this approach to convert any Iterable to a Collection, such as converting an Iterable obtained from a data source (e.g., an iterator, a list, or a set) to a Collection for further processing or manipulation.

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