What is the difference between Java HashMap and Hashtable?

Source: Internet
Author: User

What is the difference between 1.HashMap and Hashtable?
HashMap is not thread-safe and its operation method is not synchronized
HashMap allow key to be empty
    
Hashtable is thread-safe and its operation method has been synchronized modified
Hashtable does not allow key to be empty

What is the difference between 2.ArrayList and linkedlist and vectors?
ArrayList internal implementation is an object array, non-thread safe
LinkedList internal implementation is a linked list structure, non-thread-safe
Vector internal implementation is an object array, thread-safe

What is the difference between Java HashMap and Hashtable?

Contact Us

The content source of this page is from Internet, which doesn't represent Alibaba Cloud's opinion; products and services mentioned on that page don't have any relationship with Alibaba Cloud. If the content of the page makes you feel confusing, please write us an email, we will handle the problem within 5 days after receiving your email.

If you find any instances of plagiarism from the community, please send an email to: info-contact@alibabacloud.com and provide relevant evidence. A staff member will contact you within 5 working days.

A Free Trial That Lets You Build Big!

Start building with 50+ products and up to 12 months usage for Elastic Compute Service

  • Sales Support

    1 on 1 presale consultation

  • After-Sales Support

    24/7 Technical Support 6 Free Tickets per Quarter Faster Response

  • Alibaba Cloud offers highly flexible support services tailored to meet your exact needs.