HashMap vs ConcurrentHashMap inwards Java
ConcurrentHashMap inwards Java is introduced every bit an alternative of Hashtable inwards Java, which is a synchronized collection class, that makes the master copy departure betwixt HashMap as well as ConcurrentHashMap which is 1 is non-synchronized , non-thread prophylactic and non for work inwards Concurrent multi-threaded surroundings piece ConcurrentHashMap is a thread-safe collection as well as intended to survive used every bit primary Map implementation specially for multi-threaded as well as Concurrent environment. Apart from thread-safety, at that topographic point are or as well as thus subtle differences betwixt HashMap and ConcurrentHashMap which nosotros volition run into inwards this article. By the way, Difference betwixt HashMap as well as ConcurrentHashMap also every bit ConcurrentHashMap vs Hashtable are 2 pop core Java interview question, generally asked on senior score Java programmers.
1) As I said the before get-go meaning departure betwixt HashMap and ConcurrentHashMap is that afterwards is thread-safe as well as tin survive used inwards a concurrent surroundings without external synchronization. Though it doesn't render the same score of synchronization every bit achieved past times using Hashtable but it's plenty for the most practical purpose.
2)You tin brand HashMap synchronized past times wrapping it on Collections.synchornizedMap(HashMap) which volition render a collection which is almost equivalent to Hashtable, where every alteration functioning on Map is locked on Map object piece inwards illustration of ConcurrentHashMap, thread-safety is achieved past times dividing whole Map into dissimilar sectionalization based upon Concurrency level as well as entirely locking particular part instead of locking the whole Map.
3) ConcurrentHashMap is to a greater extent than scalable as well as performs meliorate than Synchronized HashMap in the multi-threaded surroundings piece inwards Single threaded surroundings both HashMap and ConcurrentHashMap gives comparable performance, where HashMap entirely slightly better.
In Summary Main departure betwixt ConcurrentHashMap and HashMap inwards Java Collection turns out to survive thread-safety, Scalability, as well as Synchronization. ConcurrentHashMap is a meliorate alternative than synchronized HashMap if you lot are using them every bit cache, which is the most pop work illustration of a Map inwards Java application. ConcurrentHashMap is to a greater extent than scalable as well as outperforms when a release of reader threads outnumber the release of author threads.
Further Learning
Java In-Depth: Become a Complete Java Engineer
Java Fundamentals: Collections
Data Structures as well as Algorithms: Deep Dive Using Java
Algorithms as well as Data Structures - Part 1 as well as 2
Data Structures inwards Java ix past times Heinz Kabutz
ConcurrentHashMap inwards Java is introduced every bit an alternative of Hashtable inwards Java, which is a synchronized collection class, that makes the master copy departure betwixt HashMap as well as ConcurrentHashMap which is 1 is non-synchronized , non-thread prophylactic and non for work inwards Concurrent multi-threaded surroundings piece ConcurrentHashMap is a thread-safe collection as well as intended to survive used every bit primary Map implementation specially for multi-threaded as well as Concurrent environment. Apart from thread-safety, at that topographic point are or as well as thus subtle differences betwixt HashMap and ConcurrentHashMap which nosotros volition run into inwards this article. By the way, Difference betwixt HashMap as well as ConcurrentHashMap also every bit ConcurrentHashMap vs Hashtable are 2 pop core Java interview question, generally asked on senior score Java programmers.
Difference betwixt HashMap as well as ConcurrentHashMap inwards Java
In this section, nosotros volition run into or as well as thus to a greater extent than details virtually HashMap as well as ConcurrentHashMap as well as compare them on diverse parameters similar thread-safety, synchronization, performance, stay of work etc.1) As I said the before get-go meaning departure betwixt HashMap and ConcurrentHashMap is that afterwards is thread-safe as well as tin survive used inwards a concurrent surroundings without external synchronization. Though it doesn't render the same score of synchronization every bit achieved past times using Hashtable but it's plenty for the most practical purpose.
2)You tin brand HashMap synchronized past times wrapping it on Collections.synchornizedMap(HashMap) which volition render a collection which is almost equivalent to Hashtable, where every alteration functioning on Map is locked on Map object piece inwards illustration of ConcurrentHashMap, thread-safety is achieved past times dividing whole Map into dissimilar sectionalization based upon Concurrency level as well as entirely locking particular part instead of locking the whole Map.
3) ConcurrentHashMap is to a greater extent than scalable as well as performs meliorate than Synchronized HashMap in the multi-threaded surroundings piece inwards Single threaded surroundings both HashMap and ConcurrentHashMap gives comparable performance, where HashMap entirely slightly better.In Summary Main departure betwixt ConcurrentHashMap and HashMap inwards Java Collection turns out to survive thread-safety, Scalability, as well as Synchronization. ConcurrentHashMap is a meliorate alternative than synchronized HashMap if you lot are using them every bit cache, which is the most pop work illustration of a Map inwards Java application. ConcurrentHashMap is to a greater extent than scalable as well as outperforms when a release of reader threads outnumber the release of author threads.
Further Learning
Java In-Depth: Become a Complete Java Engineer
Java Fundamentals: Collections
Data Structures as well as Algorithms: Deep Dive Using Java
Algorithms as well as Data Structures - Part 1 as well as 2
Data Structures inwards Java ix past times Heinz Kabutz
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