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Interview Questions and Answers for 'Coupang' - 2 question(s) found
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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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 java   collections   hashmap   map   hashtable   hashmap vs hashtable
Asked in 14 Companies
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frequent
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Try 2 Question(s) Test
Which of the following is false ?
HashMap came before HashTable.
HashMap allows null values whereas Hashtable doesn’t allow null values.
HashTable and HashMap allow Key-Value pairs.
Hashtable is synchronized whereas HashMap is not.
Which of the collections allows null as the key ?
HashTable
HashMap
TreeMap
LinkedHashMap
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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Asked in 21 Companies
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Related Questions
Difference between == and .equals() ?
Why is String immutable in Java ?
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or
What is the difference between String , StringBuilder and StringBuffer ?
What are the difference between composition and inheritance in Java?
Explain OOPs
or
Explain OOPs Principles
or
Explain OOPs Concepts
or
Explain OOPs features
or
Tell me something about OOPs
What is a Lambda Expression ? What's its use ?
What are different ways to create String Object? Explain.
Why Char array is preferred over String for storing password?
Does garbage collection guarantee that a program will not run out of memory?
What is the difference between final, finally and finalize() ?
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