Java Collections Framework provides a set of interfaces and classes that implement different data structures to store and manipulate groups of objects. It is a fundamental part of Java programming and widely used in various applications.

Key Components

  • Interfaces: Collection, List, Set, Queue, Map, and Deque
  • Classes: ArrayList, LinkedList, HashSet, TreeSet, HashMap, TreeMap, etc.

Common Usage

  • Lists: To store and manipulate ordered collections of objects.
  • Sets: To store collections of unique objects.
  • Queues: To hold multiple elements prior to processing.
  • Maps: To store key-value pairs.

Example

Here's a simple example of using an ArrayList to store a list of integers:

import java.util.ArrayList;

public class Main {
    public static void main(String[] args) {
        ArrayList<Integer> numbers = new ArrayList<>();
        numbers.add(1);
        numbers.add(2);
        numbers.add(3);
        numbers.add(4);
        numbers.add(5);

        for (Integer number : numbers) {
            System.out.println(number);
        }
    }
}

Further Reading

For more detailed information on Java Collections, you can visit the Java Collections Framework documentation.

ArrayList Example