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Showing posts with label ConcurrentHashMap. Show all posts
Showing posts with label ConcurrentHashMap. Show all posts

ConcurrentHashMap in java

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ConcurrentHashMap in java ConcurrentHashMap was introduced in Java 5 with other concurrency utils such as CountDownLatch, CyclicBarrier and BlockingQueue. ConcurrentHashMap in java is very similar to HashTable but it provides better concurrency level. You might know , you can synchonize HashMap using Collections.synchronizedMap(Map). So what is difference between ConcurrentHashMap and Collections.synchronizedMap(Map)In case of Collections.synchronizedMap(Map), it locks whole HashTable object but in ConcurrentHashMap, it locks only part of it. You will understand it in later part. Another difference is that ConcurrentHashMap will not throw ConcurrentModification exception if we try to modify ConcurrentHashMap while iterating it. Let’s take a very simple example. I have a Country class, we are going to use Country class object as key and its capital name(string) as value. Below example will help you to understand, how these key value pair will be stored in  ConcurrentHashM
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