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Understanding the Map Interface in Java

In this video, we explore the Map Interface in Java, which is part of the java.util package. Unlike other collection interfaces like List and Set, Map stores data in key-value pairs, where each key is unique, and it maps to a specific value.

Key Points Covered:

✅ Map Characteristics:
• A Map does not allow duplicate keys, but values can be duplicated.
• It allows efficient retrieval of values using keys.

✅ Common Implementations:
• HashMap – Unordered key-value mapping, fast performance.
• LinkedHashMap – Maintains insertion order.
• TreeMap – Stores keys in sorted order (natural ordering or custom comparator).

✅ Basic Operations:
• put(K key, V value) → Adds a key-value pair.
• get(K key) → Retrieves a value using a key.
• remove(K key) → Deletes a key-value pair.
• containsKey(K key) → Checks if a key exists.
• containsValue(V value) → Checks if a value exists.
• keySet(), values(), entrySet() → Useful methods for iterating over a Map.

📌 Use Case: Maps are commonly used for scenarios like storing configurations, caching, and implementing dictionaries.

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