What are the differences between a HashMap and a Hashtable in Java

0 votes
What are the differences between a HashMap and a Hashtable in Java?

Which is more efficient for non-threaded applications?
Dec 21, 2020 in Java by Rajiv
• 8,910 points
872 views

1 answer to this question.

0 votes

There are several differences between HashMap and Hashtable in Java:

  1. Hashtable is synchronized, whereas HashMap is not. This makes HashMap better for non-threaded applications, as unsynchronized Objects typically perform better than synchronized ones.

  2. Hashtable does not allow null keys or values. HashMap allows one null key and any number of null values.

  3. One of HashMap's subclasses is LinkedHashMap, so in the event that you'd want predictable iteration order (which is insertion order by default), you could easily swap out the HashMap for a LinkedHashMap. This wouldn't be as easy if you were using Hashtable.

Since synchronization is not an issue for you, I'd recommend HashMap. If synchronization becomes an issue, you may also look at ConcurrentHashMap.

answered Dec 21, 2020 by Gitika
• 65,910 points

Related Questions In Java

0 votes
0 answers

What are the differences between a HashMap and a Hashtable in Java?

What are the differences between a HashMap and a Hashtable in ...READ MORE

Apr 26, 2022 in Java by Rahul
• 3,380 points
272 views
0 votes
2 answers

What is the difference between Map and HashMap in java?

The basic difference is : Map is ...READ MORE

answered Aug 28, 2019 in Java by Sirajul
• 59,230 points
29,150 views
0 votes
2 answers

What is the difference between Set and List in java?

List is an ordered sequence of elements. ...READ MORE

answered Apr 26, 2018 in Java by Akrati
• 3,190 points
62,875 views
0 votes
2 answers

What is the difference between getAttribute() and getParameter() in java?

getParameter() returns http request parameters. Those passed from ...READ MORE

answered Aug 28, 2019 in Java by Sirajul
• 59,230 points
21,675 views
0 votes
2 answers

How is hashmap different from hashtable?

HashMap and HashTable: 1) Hashtable and Hashmap implement ...READ MORE

answered Aug 1, 2018 in Java by samarth295
• 2,220 points
6,075 views
0 votes
2 answers

Ho do I Iterate through a HashMap which contains duplicate values

for (Map.Entry<String, String> item : params.entrySet()) { ...READ MORE

answered Jul 24, 2018 in Java by samarth295
• 2,220 points
4,917 views
0 votes
2 answers

Performing Iteration over each entry in a 'Map'

In Java 8 you can do it ...READ MORE

answered Oct 24, 2018 in Java by Sushmita
• 6,910 points
859 views
0 votes
2 answers
+1 vote
7 answers

What is difference between access modifier and access specifier in java

Access Specifier:- This can be understood as ...READ MORE

answered Feb 14, 2019 in Java by Priyaj
• 58,090 points
68,453 views
+1 vote
4 answers

What is a simple way to repeat a string in java?

There is already answer wriiten using StringBuilder ...READ MORE

answered Dec 16, 2020 in Java by Rajiv
• 8,910 points
28,720 views
webinar REGISTER FOR FREE WEBINAR X
REGISTER NOW
webinar_success Thank you for registering Join Edureka Meetup community for 100+ Free Webinars each month JOIN MEETUP GROUP