The concurrent collection APIs, apart from the Java Collection API, are a set of collections APIs that are designed and optimized specifically for synchronized multithreaded access. They are grouped under the java. util. concurrent package.

What are the concurrent collections in Java?

Concurrent collections in java are designed and optimized specifically for synchronized multithreaded access. These are the thread safe collections, and these are existing in java. util. concurrent package.

What is the difference between synchronized collection and concurrent collection?

The main reason for this slowness is locking; synchronized collections lock the whole collection e.g. whole Map or List while concurrent collection never locks the whole Map or List. They achieve thread safety by using advanced and sophisticated techniques like lock stripping.