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Both are used to work with groups of objects, but they serve very different purposes:
📋 Collection (Java Collections Framework)
➡️ Stores data in memory (e.g., List, Set, Map)
➡️ Focuses on data storage and retrieval
➡️ Supports iteration (for-each, iterator)
➡️ Example:
List〈String〉names = List.of("Alice", "Bob");
🌊 Stream (Java 8 Streams API)
➡️ Does not store data, works on data from a collection or other source
➡️ Focuses on data processing (filtering, mapping, reducing)
➡️ Can be sequential or parallel
➡️ Example:
names.stream().filter(n -〉 n.startsWith("A")).forEach(System.out::println);
🧠 Key difference:
- Collection = represents data
- Stream = represents operations on data
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