Java Collection Framework Guide

Java Collection Framework is a set of interfaces and classes that provides an architecture to store and manipulate groups of objects. This guide will help you understand the basics of the Java Collection Framework and how to use it effectively.

Overview

The Java Collection Framework provides a wide range of interfaces and classes for different types of collections. Here are some of the key components:

List: An ordered collection of elements. The elements can be accessed by their index.
Set: A collection of elements without duplicates. The elements are unique.
Queue: A collection used to hold elements prior to processing.
Map: A collection of key-value pairs. The keys are unique.

Common Interfaces

Here are some of the most commonly used interfaces in the Java Collection Framework:

List: ArrayList, LinkedList
Set: HashSet, LinkedHashSet, TreeSet
Queue: LinkedList, PriorityQueue
Map: HashMap, LinkedHashMap, TreeMap

Example

Here's an example of how to use 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);
        
        System.out.println(numbers);
    }
}

Resources

For more information on the Java Collection Framework, you can visit the following resources: