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|Interview Questions and Answers|
|Frequently asked in high end product companies. Frequently asked in Deloitte.|
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|Like Discuss Correct / Improve  hashmap  collections  hashmap internal implementation Asked in 20 Companies expert   frequent|
|Difference between HashMap and Hashtable?|
|Difference between TreeMap and HashMap ?|
|Can you provide some implementation of a Dictionary having large number of words ?|
|What is a ConcurrentHashMap ?|
|Why HashTable has been deprecated ?|
|Can we use null as a key for a map collection ?|
| Which of the following collections stores its elements in insertion Order ? |
|Difference between Map and HashMap ?|
|Can we add duplicate keys in a HashMap ? What will happen if we attempt to add duplicate values ?|