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
|HashMap 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.
HashMap is not thread-safe while
ConcurrentHashMap is thread-safe.
|1 null key
|not allowed null key
|HashMap allowed one null key and multiple null values while
ConcurrentHashMap not allow null key.
|Any 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:
- Difference between HashMap and ConcurrentHashMap in java
- Difference Between HashMap and HashSet in Java
- HashMap Vs HashTable Vs SynchronizedMap Vs ConcurrentHashMap in Java
Happy learning of differences between HashMap and ConcurrentHashMap.