Implement LRU Cache | Implement LRU Cache using HashMap & Doubly Linked List | Programming Tutorials

Published: 25 April 2020
on channel: Programming Tutorials

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Explained LRU Cache Implementation using HashMap and Doubly Linked List and it's Java Code.

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In this tutorial, I have explained how to implement LRU cache get and put method in O(1) time complexity using HashMap and Doubly Linked List.

We have to design and implement a data structure for LRU (Least Recently Used) cache. It should support two operations get and put in O(1) time.

get(key) - Get the value if the key exists in a cache else returns -1.
put(key, value) - Insert the value if the key is already not present in a cache. When the cache reached its capacity, it should invalidate the least recently used item before inserting a new item.

The cache is Initialized with positive capacity.

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