LRU Cache | Learn for Master
  • Leetcode – LRU cache solution in Java

    LRU cache figure

    Design and implement a data structure for Least Recently Used (LRU) cache. It should support the following operations: get and set.

    get(key) – Get the value (will always be positive) of the key if the key exists in the cache, otherwise return -1.
    set(key, value) – Set or insert the value if the key is not already present. When the cache reached its capacity, it should invalidate the least recently used item before inserting a new item.

    Analysis

    The popular method to implement an LRU cache is to use a bounded Queue. 

    The key to for implementing an LRU is to put any recently used data at the head of the queue.

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