• Post Reply Bookmark Topic Watch Topic
  • New Topic
programming forums Java Mobile Certification Databases Caching Books Engineering Micro Controllers OS Languages Paradigms IDEs Build Tools Frameworks Application Servers Open Source This Site Careers Other Pie Elite all forums
this forum made possible by our volunteer staff, including ...
Marshals:
  • Campbell Ritchie
  • Tim Cooke
  • Devaka Cooray
  • Ron McLeod
  • Jeanne Boyarsky
Sheriffs:
  • Liutauras Vilda
  • paul wheaton
  • Junilu Lacar
Saloon Keepers:
  • Tim Moores
  • Stephan van Hulst
  • Piet Souris
  • Carey Brown
  • Tim Holloway
Bartenders:
  • Martijn Verburg
  • Frits Walraven
  • Himai Minh

Hashtable vs HashMap

 
Ranch Hand
Posts: 47
  • Mark post as helpful
  • send pies
    Number of slices to send:
    Optional 'thank-you' note:
  • Quote
  • Report post to moderator
Hi,

What is the major difference between a hashtable and hashmap? Thanks.
 
Ranch Hand
Posts: 225
  • Mark post as helpful
  • send pies
    Number of slices to send:
    Optional 'thank-you' note:
  • Quote
  • Report post to moderator
Hashtable is synchronized, HashMap not.
 
Greenhorn
Posts: 13
  • Mark post as helpful
  • send pies
    Number of slices to send:
    Optional 'thank-you' note:
  • Quote
  • Report post to moderator
HashMap class is not thread-safe nad permits one null key,the HashTable class is thread-safe and permits non-null keys and values only.
The Thread-safety that <i>HashTable</i> class provides has a performance penalty. HashTable class is a legay class that has been retrofitted to implement the Map interface.
 
Ranch Hand
Posts: 1780
  • Mark post as helpful
  • send pies
    Number of slices to send:
    Optional 'thank-you' note:
  • Quote
  • Report post to moderator
if you are considering using HashTable or Collections.synchronizedMap(new HashMap())
because its methods are "thread-safe", check out java.util.concurrent.ConcurrentHashMap first:

Brian Goetz's articl on ConcurrentHashMap

ConcurrentHashMap API
 
Ronnie Ho
Ranch Hand
Posts: 47
  • Mark post as helpful
  • send pies
    Number of slices to send:
    Optional 'thank-you' note:
  • Quote
  • Report post to moderator
Thanks all.
 
You would be much easier to understand if you took that bucket off of your head. And that goes for the tiny ad too!
the value of filler advertising in 2021
https://coderanch.com/t/730886/filler-advertising
reply
    Bookmark Topic Watch Topic
  • New Topic