Java Collections Framework | ArrayList, HashSet, and HashMap Explained | Core Java Full Course

Welcome to Session 20 of our Core Java tutorial series! In this video, we introduce the Java Collections Framework and explore its key components like ArrayList, HashSet, and HashMap. Here's what you'll learn:

✔️ What is a Collection?
- A collection represents a group of objects as a single entity.

✔️ ArrayList:
Implements the List interface.
Key Features:
1️⃣ Heterogeneous data allowed.
2️⃣ Insertion order preserved (supports indexing).
3️⃣ Duplicate elements allowed.
4️⃣ Multiple null values allowed.

✔️ HashSet:
Implements the Set interface.
Key Features:
1️⃣ Heterogeneous data allowed.
2️⃣ Insertion order not preserved (index not supported).
3️⃣ Duplicate elements not allowed.
4️⃣ Only a single null value allowed.

✔️ HashMap:
Implements the Map interface.
Key Features:
1️⃣ Stores data as key-value pairs.
2️⃣ Keys must be unique, but values can be duplicate.
3️⃣ Insertion order not preserved (index not followed).

✔️ When to Use:
- ArrayList: When you need an ordered collection with duplicates allowed.
- HashSet: When unique elements without order are required.
- HashMap: For key-value pair storage where keys must be unique.

By the end of this video, you’ll have a solid understanding of how to use these collection classes in your Java programs to manage and manipulate data effectively.

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