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Java Collections Framework

Last Updated : 26 May, 2026

title: Collections Framework Overview

Collections Framework68 words4 headingsTables includedExamples included

title: Collections Framework Overview description: Java Collections Framework ka introduction

Kya Hai?

Pre-built data structures aur algorithms ka set jo common programming tasks simplify karta hai.

Hierarchy

Collection (Interface) ├── List (Interface) — Ordered, Duplicates allowed │ ├── ArrayList │ ├── LinkedList │ ├── Vector │ └── Stack │ ├── Set (Interface) — No duplicates │ ├── HashSet │ ├── LinkedHashSet │ └── TreeSet │ └── Queue (Interface) — FIFO ├── PriorityQueue ├── Deque └── ArrayDeque Map (Interface) — Key-Value pairs ├── HashMap ├── LinkedHashMap ├── TreeMap └── Hashtable

import karna

java exampleWoHoTech

import java.util.*; // Sab ek saath
// Ya specific:
import java.util.ArrayList;
import java.util.HashMap;

Kab Kya Use Karein?

Need	Use
Ordered list, index access	ArrayList
Frequent insert/delete	LinkedList
Unique elements	HashSet
Unique + sorted	TreeSet
Key-Value store	HashMap
Key-Value + sorted	TreeMap
Priority based processing	PriorityQueue

Exam Focus

Revise definitions, diagrams, examples, and short-answer points for Java Collections Framework.

Interview Use

Prepare one clear explanation, one practical example, and one common mistake for this Java topic.

Search Terms

java, java programming, core java, java master course, java notes, master, course, collections

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Collections FrameworkCollections Practice Programstitle: Collections Programs Collections FrameworkComparable vs Comparatortitle: Comparable vs Comparator Collections FrameworkGenericstitle: Generics in Java Collections FrameworkIteratortitle: Iterator in Java Collections FrameworkArrayListtitle: ArrayList in Java Collections FrameworkLinkedListtitle: LinkedList in Java

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