HashMap and concurrency- different keys

Question

Say I have a hash map and multiple threads. If I have a synchronized method that adds to the hash map, how would I make it possible that two different threads can put differ

Answer 1

The answer to your question is NO. Because synchronized block forces every tread to wait in the single queue. With ConcurrentHashMap you have more chances for simultaneously add, because it locks only basket where element will be inserted instead of locking whole HashMap.