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Q.Difference between HashMap and HashTable?
a)The key difference between the two is that access to the Hashtable is synchronized while access to the HashMap is not synchronized.
b)HashMap permits null values as Key, while Hashtable doesn't.
c)iterator in a HashMap is fail-safe(Fail-safe is relevant from the context of iterators.
If an iterator has been created on a collection object and some other thread tries to modify the collection object "structurally",
a concurrent modification exception will be thrown) while the enumerator of HashTable is not.

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