Apple Software Engineer interview questions

There was one phone interview, then 3 rounds of technical and design interviews, 1 hour each. 1. Design an LRU cache 2. What would you consider other caches for a system

The process wasvery erratic without a clear directive of what was going to be asked. Prepare Java, Spring boot and multithreading theory very well. They will ask you very simple DS Algo. Most of the focus is in asking remote Java concepts like the different algorithms a garbage collector follows.