HashMap Vs ConcurrentHashMap

Connect with

HashMap Vs ConcurrentHashMapHashMap vs concurrentHashMap, well, this is one of the important interview question, in another way, what is basic differences between HashMap and ConcurrentHashMap?

HashMap Vs ConcurrentHashMap

Follwoing is the differences between concurrentHashMap and Hashmap in java. You can visit to know more about manupulation of any entry (key/value pair) of HashMap in Java, like How to remove Entry from HashMap in Java

SynchronizationNoYesHashMap can be synchronized by using Collections.synchronizedMap(new HashMap()) ~ this way method we get a HashMap object which is equivalent to the HashTable object \, so every modification operation is performed on Map is locked on Map object.
ThreadsafeNoYesHashMap is not thread-safe while ConcurrentHashMap is thread-safe.
Null Key1 null keynot allowed null keyHashMap allowed one null key and multiple null values while ConcurrentHashMap not allow null key.
PerformancefastSlowerAny number of thread can access HashMap object without locking \, while in ConcurrentHashMap lock portion of bucket.

Differences between some java classes

You can visit other differences between two java classes:

Happy learning of differences between HashMap and ConcurrentHashMap.

Connect with

3 thoughts on “HashMap Vs ConcurrentHashMap”

  1. Hiya! I know this is kinda off topic but I’d figured
    I’d ask. Would you be interested in trading links or maybe guest writing a blog post or vice-versa?

    My website covers a lot of the same subjects as yours and
    I think we could greatly benefit from each other. If you might be interested feel free to send
    me an email. I look forward to hearing from you! Awesome blog by the

  2. Aw, this was an incredibly good post. Spending some time and actual effort to
    make a very good article? but what can I say? I put things
    off a lot and never manage to get nearly anything done.

Leave a Comment

Your email address will not be published. Required fields are marked *