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Interview Questions and Answers for 'Blackberry' - 2 question(s) found - Order By Newest

 Q1. Can we use null as a key for a map collection ?Core Java
Anonymous
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     BlackBerry


Related Questions

  Difference between HashMap and Hashtable?
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  Which of the following is false ?
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 Difference between concurrentHashMap and HashTable ?


Frequently asked to fresh graduates.
  Q2. What is a Deadlock ?Operating System
Anonymous
Ans. When two threads are waiting each other and cant precede the program is said to be deadlock.

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Related Questions

  What is database deadlock ? How can we avoid them?
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