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| Ans. Map is an interface where HashMap is the concrete class. | ||||
 Sample Code for map Sample Code for hashmap | ||||
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 Discuss Correct / Improve  java collections hashmap map  basic  frequent | ||||
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| Can we use null as a key for a map collection ? | ||||
| Which of the following collections stores its elements in insertion Order ? a. HashMap b. TreeMap c. LinkedHashMap d. LinkedMap | ||||
| Can we add duplicate keys in a HashMap ? What will happen if we attempt to add duplicate values ? | ||||
