This week's book giveaway is in the Testing forum.
We're giving away four copies of Data Structures the Fun Way: An Amusing Adventure with Coffee-Filled Examples and have Jeremy Kubica on-line!
See this thread for details.
  • 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
  • Liutauras Vilda
  • Tim Cooke
  • Jeanne Boyarsky
  • Paul Clapham
Sheriffs:
  • Devaka Cooray
  • Ron McLeod
  • paul wheaton
Saloon Keepers:
  • Tim Moores
  • Piet Souris
  • Tim Holloway
  • Stephan van Hulst
  • Carey Brown
Bartenders:
  • Al Hobbs
  • Frits Walraven
  • Scott Selikoff

difference between instance variable and class variable

 
Ranch Hand
Posts: 243
  • Mark post as helpful
  • send pies
    Number of slices to send:
    Optional 'thank-you' note:
  • Quote
  • Report post to moderator
Hi,
Can Any one explain me difference between instance variable and class variable.As i got confused with those.
Thanks in advance.
 
Ranch Hand
Posts: 52
  • Mark post as helpful
  • send pies
    Number of slices to send:
    Optional 'thank-you' note:
  • Quote
  • Report post to moderator

[ August 07, 2007: Message edited by: Ameen khan ]
 
Ranch Hand
Posts: 1140
  • Mark post as helpful
  • send pies
    Number of slices to send:
    Optional 'thank-you' note:
  • Quote
  • Report post to moderator

Originally posted by Ameen khan:
Class variables = instance variables + static variables





When you create different instances of a class, each instance will have it's own copy of the (instance) variables defined in the class. Modifying an instance variable of one class won't affect the instance variable of another class.
When you define a variable as static, it becomes a class variable. In this case only one copy of the variable is made and all the instances will share this single copy. If you make a change to this variable, it will reflect everywhere (i.e. in all instances).
 
Java Cowboy
Posts: 16084
88
Android Scala IntelliJ IDE Spring Java
  • Mark post as helpful
  • send pies
    Number of slices to send:
    Optional 'thank-you' note:
  • Quote
  • Report post to moderator
See this: Understanding Instance and Class Members

Instance variable: For every instace that you create of a class, there is a separate copy of the variable - each object has its own copy of the variable.

Class variable: There is one variable which is shared by all the instances of the class - there's only one variable which is shared by all the objects.

Class variables are member variables that have the static modifier. Instance variables are member variables that do not have the static modifier.
 
Ranch Hand
Posts: 225
  • Mark post as helpful
  • send pies
    Number of slices to send:
    Optional 'thank-you' note:
  • Quote
  • Report post to moderator
hi i found the difference, its not very detailed but basic difference is given and the link is
http://www.sap-img.com/java/difference-of-class-variable-and-instance-variable.htm
 
srinivas sridaragaddi
Ranch Hand
Posts: 225
  • Mark post as helpful
  • send pies
    Number of slices to send:
    Optional 'thank-you' note:
  • Quote
  • Report post to moderator
hi i found the difference, its not very detailed but basic difference is given and the link is
http://www.sap-img.com/java/difference-of-class-variable-and-instance-variable.htm
 
It will give me the powers of the gods. Not bad for a tiny ad:
the value of filler advertising in 2021
https://coderanch.com/t/730886/filler-advertising
reply
    Bookmark Topic Watch Topic
  • New Topic