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Interview Questions and Answers for 'Blackberry' - 3 question(s) found - Order By Newest

Frequently asked to fresh graduates.
  Q1. 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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   Like         Discuss         Correct / Improve     java   threads   multi threading   operating system   deadlock  concurrency     Asked in 23 Companies      basic        frequent


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 Q2. 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     Asked in 1 Companies


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  Difference between HashMap and Hashtable?
 Why HashTable has been deprecated ?
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  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 ?

a. HashTable
b. HashMap
c. TreeMap
d. LinkedHashMap
 Difference between concurrentHashMap and HashTable ?


 Q3. Explain OAuth.Authentication2018-07-16 09:41:42

Ans. OAuth is an open-standard authorization protocol or framework that describes how unrelated servers and services can safely allow authenticated access to their assets without actually sharing the initial, related, single logon credential. Like using Google or Facebook to login to something.

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   Like         Discuss         Correct / Improve          Asked in 17 Companies


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