Why HashMap is faster than other map?

Uses an array-based data structure

Can a HashMap have duplicate keys?

There is no difference between JSON and Map

What is the difference between HashSet and Hashtable?

Hashtable is a legacy class that should be avoided in favor of HashMap

HashSet implements Map, Hashtable implements Set

When you only need to use the basic Map methods and don't require any additional functionality

What are keys in HashMap?

The values stored in the hash table

The unique identifiers used to access values in the hash table

When would you not use a HashMap?

When all object keys have the same hashCode

When thread synchronization is needed

How do you create a HashMap?

By calling the new() method on the HashMap class

By using the put() method to add key-value pairs to an existing HashMap

Uses an array-based data structure

Depends on the Map implementation

What is HashMap and how does it work?

A data structure that stores key-value pairs, using multiple buckets and a hash function to organize and access the pairs

A sorting algorithm that rearranges elements in an array based on their value

What is the main difference between ArrayMap and HashMap?

ArrayMap is more memory-efficient

HashMap is more memory-efficient

They are equally memory-efficient

The values stored in the hash table

Why can HashMap have only one null key?

Because keys are unique in HashMap

Because null keys are not allowed in HashMap

Because null values are not allowed in HashMap

When all object keys have the same hashCode

What is the main difference between HashMap and TreeMap in Java?

TreeMap allows null keys but HashMap does not

HashMap allows null keys but TreeMap does not

Both HashMap and TreeMap allow null keys

By calling the new() method on the HashMap class

What type of tree is used in HashMap in Java?

A data structure that stores key-value pairs, using multiple buckets and a hash function to organize and access the pairs

Is hashing generally faster than searching?

It depends on the specific implementation

What is the main difference between JSON and Map?

JSONObject can contain duplicate keys, while Map cannot

Map is an ordered collection of name/value pairs, while JSONObject is unordered

There is no difference between JSON and Map

When would you use a Map over a HashMap in Java?

When you only need to use the basic Map methods and don't require any additional functionality

When you need to perform a lot of insertions and deletions

When you need to maintain the order of elements

IS null allowed in Map?

Depends on the Map implementation

Why do we use maps in Java?

To associate a key with a value

9-HashMap+java

Authored by ANIL KUMAR

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Professional Development

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40 questions

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MULTIPLE CHOICE QUESTION

20 sec • 1 pt

What is a HashMap in Java?

Data structure

Method

Interface

Class

MULTIPLE CHOICE QUESTION

20 sec • 1 pt

What is the purpose of using a HashMap in Java?

To store elements in key/value pairs

To sort data in ascending order

To perform mathematical calculations

To create loops

MULTIPLE CHOICE QUESTION

20 sec • 1 pt

Is HashMap better than an array in Java?

Yes

Depends on the use case

Both are equally good

MULTIPLE CHOICE QUESTION

20 sec • 1 pt

What is HashMap and HashSet in Java?

Pairs

Key-Value

Indexing

Objects

MULTIPLE CHOICE QUESTION

20 sec • 1 pt

Is HashMap a data structure?

Yes

Non-Synchronized

Key-Value

MULTIPLE CHOICE QUESTION

20 sec • 1 pt

When would you use a HashMap in Java?

Duplicate

Unique

cSorted

None

MULTIPLE CHOICE QUESTION

20 sec • 1 pt

What is the difference between ArrayList and HashMap in Java?

Values

Pairs

Keys

Indexing

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9-HashMap+java

What is a HashMap in Java?

What is the purpose of using a HashMap in Java?

Is HashMap better than an array in Java?

What is HashMap and HashSet in Java?

Is HashMap a data structure?

When would you use a HashMap in Java?

What is the difference between ArrayList and HashMap in Java?

Which is faster list or map in Java?

Why to HashMap what is advantages?

Is JavaScript object a HashMap?

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