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An ArrayList is a dynamic array in Java that can grow or shrink in size as needed.
ArrayList is a class in Java's Collection framework.
It allows for dynamic resizing of the array.
Elements can be added, removed, or accessed using index.
Example: ArrayList<String> names = new ArrayList<String>();
A hash map is a data structure that stores key-value pairs and allows for efficient retrieval of values based on keys.
Hash map uses a hash function to map keys to indices in an array.
It allows for constant time average case complexity for insertion, deletion, and lookup operations.
Collisions can occur when multiple keys hash to the same index, which can be resolved using techniques like chaining or open addressing.
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