• 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 all forums
this forum made possible by our volunteer staff, including ...
Marshals:
  • Campbell Ritchie
  • Liutauras Vilda
  • Devaka Cooray
  • Jeanne Boyarsky
  • Bear Bibeault
Sheriffs:
  • Junilu Lacar
  • Paul Clapham
  • Knute Snortum
Saloon Keepers:
  • Ron McLeod
  • Tim Moores
  • Stephan van Hulst
  • salvin francis
  • Carey Brown
Bartenders:
  • Tim Holloway
  • Frits Walraven
  • Ganesh Patekar

Synchronization  RSS feed

 
Ranch Hand
Posts: 244
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
Hello,

Can anybody explain me when and why do I need

a) class level synchronization
b) method level synchronization() and
c) synchronization block

Thank you in advance.

Kousik
 
Bartender
Posts: 1638
IntelliJ IDE Java MySQL Database
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
Hi Kousik,

Synchronization is always done on an object. It is to ensure that only one thread, using the same object, executes the code in the synchronized block at any instance.
The 3 types that you have mentioned just uses different objects for synchronization, viz.:

1) Static synchronized methods uses the class object.
2) non-static synchronized methods uses the "this" object.
3) Synchronized blocks can use any object that the user specifies.

Static synchronized methods ensure that at no time two threads can execute the code simultaneously.
Non-Static synchronized methods ensure that at no time two threads that uses a single instance of that class can execute the code simultaneously.
Synchronized blocks ensure that at no time two threads that uses the same object instance, as is used to synchronize, can execute the code simultaneously.

Hope it is clear.
 
All of the world's problems can be solved in a garden - Geoff Lawton. Tiny ad:
RavenDB is an Open Source NoSQL Database that’s fully transactional (ACID) across your database
https://coderanch.com/t/704633/RavenDB-Open-Source-NoSQL-Database
  • Post Reply Bookmark Topic Watch Topic
  • New Topic
Boost this thread!