What is the difference between List, Set, and Map?

August 03, 2025

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🔹 List vs Set vs Map in Java

Java provides different Collection types to store and manage groups of objects. The most commonly used are List, Set, and Map, each serving a different purpose.

✅ List

An ordered collection that allows duplicates.

Elements are stored in index-based order.

You can access elements by their position.

Example Implementations:

ArrayList, LinkedList

Usage:

java

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List<String> list = new ArrayList<>();

list.add("A");

list.add("A"); // Duplicates allowed

✅ Set

A collection of unique elements.

No duplicates allowed.

Unordered (in HashSet), but TreeSet maintains order.

Example Implementations:

HashSet, LinkedHashSet, TreeSet

Usage:

java

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Set<String> set = new HashSet<>();

set.add("A");

set.add("A"); // Ignored (duplicate)

✅ Map

Stores key-value pairs.

Keys must be unique, values can be duplicated.

Useful for lookup operations.

Example Implementations:

HashMap, TreeMap, LinkedHashMap

Usage:

java

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Map<Integer, String> map = new HashMap<>();

map.put(1, "A");

map.put(1, "B"); // Overwrites value for key 1

📊 Summary Table:

Feature List Set Map

Duplicates Allowed Not Allowed Keys: No, Values: Yes

Order Maintained Not always Depends on implementation

Access By index By element By key

Let me know if you'd like a visual chart or social media version of this!

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