“Java Collections Framework: An Introduction to Collections in Java”


“Java Collections Framework: An Introduction to Collections in Java”

The Java Collections Framework provides a set of classes and interfaces that implement commonly used data structures such as lists, sets, maps, and queues. This system makes it easier for developers to organize and manipulate groups of objects.

Understanding Java Collections

In Java, collections are objects that store and manage groups of elements. The most commonly used interfaces in the Java Collections Framework are:

  • Collection: Represents a group of objects known as elements.
  • List: An ordered collection that allows duplicate elements.
  • Set: An unordered collection that does not allow duplicate elements.
  • Map: A collection that stores key-value pairs.

Using Collections in Java

Here's an example of how to create and use a List in Java:

import java.util.ArrayList;
import java.util.List;

public class Main {
    public static void main(String[] args) {
        List<String> names = new ArrayList<>();
        for (String name : names) {

In this example, we create a List of strings and add three names to it. We then iterate over the list and print each name to the console.


The Java Collections Framework is a powerful tool for managing and manipulating groups of elements in Java. By understanding the different types of collections available and how to use them, you can write more efficient and organized code.