How to cast ArrayList<> from List<> in java

How to cast ArrayList<> from List<> in java

To cast an ArrayList<> from a List<> in Java, you don't actually need to perform a cast because ArrayList is a subclass of List. You can simply create a new ArrayList and pass the List to its constructor. Here's how you can do it:

List<SomeType> list = new ArrayList<>(); // This can be any List implementation ArrayList<SomeType> arrayList = new ArrayList<>(list);

In this code:

  1. list is an instance of List<>, which can be any implementation of the List interface (e.g., ArrayList, LinkedList, etc.).

  2. arrayList is an instance of ArrayList<>. You can create it by passing the list as an argument to the ArrayList constructor. This creates a new ArrayList that contains the same elements as the original list.

Here's a complete example:

import java.util.ArrayList; import java.util.List; public class ArrayListFromListExample { public static void main(String[] args) { // Create a List List<String> list = new ArrayList<>(); list.add("Item 1"); list.add("Item 2"); list.add("Item 3"); // Convert the List to an ArrayList ArrayList<String> arrayList = new ArrayList<>(list); // Now, you have an ArrayList containing the same elements as the original List System.out.println(arrayList); } }

In this example, list is converted to an ArrayList named arrayList, and you can work with arrayList just like any other ArrayList.

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