Question:Which collection class allows you to access its elements by associating a key with an element's value, and provides synchronization? 

A java.util.SortedMap 
B java.util.TreeMap 
C java.util.TreeSet 
D java.util.Hashtable 

+ Answer
D 

+ Explanation
Hashtable is the only class listed that provides synchronized methods. If you need synchronization great; otherwise, use HashMap, it's faster.

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Suman Chowdhury

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