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

Very frequently asked across all types of companies.
  Q1. Difference between HashMap and Hashtable?Core Java
Ans. Hashtable is synchronized whereas HashMap is not.HashMap allows null values whereas Hashtable doesnt allow null values.

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   Like         Discuss         Correct / Improve     java   collections   hashmap   map   hashtable   hashmap vs hashtable     Asked in 14 Companies      basic        frequent

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Related Questions

 Why HashTable has been deprecated ?
  Can we use null as a key for a map collection ?
  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 ?

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


 Q2. Why do you want to leave your current job ?General
Ans. The most effective and acceptable reasons for leaving your current job should be positive e.g. moving forward in your life or career

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   Like         Discuss         Correct / Improve          Asked in 21 Companies


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What is the difference between String , StringBuilder and StringBuffer ?
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 Explain OOPs

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Explain OOPs Principles

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Explain OOPs Concepts

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