What are the common use cases for LinkedHashMap?

What are the common use cases for LinkedHashMap?

LinkedHashMap is often used when you need a map that maintains insertion order. Common use cases include caching, maintaining a history of items, and implementing LRU (Least Recently Used) caches.

Can you give me an example of how to use it in a caching scenario?

Sure! In a caching scenario, you can use LinkedHashMap to store key-value pairs where the keys are the items being cached. By overriding the removeEldestEntry method, you can automatically remove the oldest entry when the cache exceeds a certain size.

What are the performance implications of using LinkedHashMap?

LinkedHashMap provides O(1) time complexity for basic operations like get and put, but it uses more memory than HashMap due to maintaining the order of elements.

Are there any alternatives to LinkedHashMap?

Yes, alternatives include TreeMap for sorted order and HashMap for faster performance without order. Each has its own use cases.