Difference between Hash map and arralylist. Internal implementaion of Hashmap,concurrent modificaiton excpetion, streams, AWS lambda etc.,

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HashMap is a key-value pair data structure with constant time complexity for basic operations, while ArrayList is a dynamic array with linear time complexity for basic operations.

HashMap uses hashing to store key-value pairs, allowing for fast retrieval based on keys.
ArrayList is a resizable array that stores elements in a sequential manner.
ConcurrentModificationException occurs when a collection is modified while iterating over it.
Streams in Java provide a way to process collections of objects in a functional style.
AWS Lambda is a serverless computing service that runs code in response to events.

Difference between Hash map and arralylist. Internal implementaion of Hashmap,concurrent modificaiton excpetion, streams, AWS lambda etc.,

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