Difference Between HashMap and HashTable (Interview)
Interactive Video
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Information Technology (IT), Architecture
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University
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Practice Problem
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Hard
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7 questions
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1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is a common interview question regarding HashMap and HashTable?
What is the difference between HashMap and HashTable?
What are the uses of HashMap?
How to optimize a HashTable?
How to implement a HashMap?
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Which of the following is true about HashMap?
It is synchronized and thread-safe.
It does not allow null keys.
It requires an Enumerator for iteration.
It is not synchronized and not thread-safe.
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What happens when multiple threads access a HashMap simultaneously?
The HashMap throws an exception.
The HashMap becomes synchronized.
The HashMap locks until one thread finishes.
The HashMap updates concurrently without synchronization.
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Which data structure allows null keys and values?
HashMap
HashTable
Neither HashMap nor HashTable
Both HashMap and HashTable
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Why might you choose a HashTable over a HashMap?
To ensure thread safety.
To allow null keys and values.
To improve performance with multiple threads.
To use an Iterator for iteration.
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Which interface is used to iterate over a HashMap?
Collection
ListIterator
Enumerator
Iterator
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is required to iterate over a HashTable?
Iterator
Enumerator
Collection
ListIterator
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