Using Collections in Java

In Java, Collections denotes a framework designed to facilitate the handling and storage of data groups. The Java Collections Framework (JCF) embodies interfaces, implementations, and algorithms to represent and handle collections coherently. The chief interfaces encapsulated within the framework include Collection, List, Set, Queue, and Deque. Concrete data structures like ArrayList, LinkedList, HashSet, LinkedHashSet, TreeSet, PriorityQueue, and others are the tangible manifestations of these interfaces. With the aid of collections, one can efficiently store, modify, and retrieve data and carry out assorted operations such as searching, sorting, adding, and removing items. In this Java Collections Example, we instantiate an ArrayList, populate it with elements, organize them in an order, and display the results. Click Execute to run the Java Collections Example online and see the result.
Using Collections in Java Execute 
import java.util.ArrayList;
import java.util.Collections;

public class CollectionsExample {
    public static void main(String[] args) {
        ArrayList<Integer> numbers = new ArrayList<>();

        numbers.add(8);
        numbers.add(1);
        numbers.add(3);
      
        System.out.println("Original list: " + numbers);

        Collections.sort(numbers);

        System.out.println("Sorted list: " + numbers);
    }
}
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