Instance variables in java with example program

• Variables declared inside a class and outside method without static keyword known as instance variables.
• Instance variables will be used by objects to store state of the object.
• Every object will have their own copy of instance variables. where as static variables will be single and shared(accessed) among objects.
• Instance variables will be associated with the instance(Object)
• Static variables will be associated with the class.

#1: Java example program on declaring and accessing instance variables.

1. package com.instanceofjava.instancevariables;
2. 
   
3. /**
4.  * @author www.Instanceofjava.com
5.  * @category interview questions
6.  * 
7.  * Description: Instance variables in java with example program
8.  *
9.  */
10. public class InstanceVariables {
11. 
    
12. String websiteName;
13. String category;
15. public static void main(String[] args) {
17. InstanceVariables obj = new InstanceVariables();
18. obj.websiteName="www.InstanceOfJava.com";
19. obj.category="Java tutorial/interview questions";
21. 
    
22. }
23. 
    
24. }

• Instance variables allows all four type of access specifiers in java

• Instance variables can be final and transient

• Instance variables can not be declared as abstract, static strictfp, synchronized and native