Hashmap Can Be Synchronized By
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Hashmap Can Be Synchronized By
Map<string,string> synchronizedhashmap = collections.synchronizedmap (new hashmap<string, string> ()); In order to guarantee serial access, it is critical that all access to the backing map is accomplished through the returned map. Hashmap is not thread safe.
As per my knowledge synchronization means accessing a object at a time by one thread. But in my project i am using hashmap. 3 i know hashtable is synchronized, whereas hashmap is not.
If hashmap is accessed by multiple threads concurrently and at least one of the threads modifies the map structurally, you must synchronize hashmap externally.
2) hashmap allows one null key and multiple null values. Or alternatively you can use concurrenthashmap which was introduced in jdk 1.5 You can synchronize hashmap using collection class’s static synchronizedmap method as below : Hashtable doesn't allow any null key or value.
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