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|Interview Questions and Answers|
|Ans. Yes , for HashMap. HashMap implements Map interface. HashMap allows one null key and any number of null values.|
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|Like Discuss Correct / Improve  java   collections   hashmap   map   hashtable   yes-no Asked in 1 Companies|
|Difference between HashMap and Hashtable?|
|Why HashTable has been deprecated ?|
|What is a Property class ?|
|Can we add duplicate keys in a HashMap ? What will happen if we attempt to add duplicate values ?|
|Which interface does java.util.Hashtable implement?|
|Which interface does java.util.Hashtable implement ?|
|Which of the following is false ?|
| Which of the collections allows null as the key ? |
|Difference between concurrentHashMap and HashTable ?|