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Final Variables

 
Greenhorn
Posts: 5
Android Java Linux
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Hi...!!! check this program:


Acc to me(with ref to the above code) Final variables are not assigned default values ever but i hv not read this statement in any book i hv read abt java......
Can somebody please clarify this fact!!!....
 
Ranch Hand
Posts: 5575
Eclipse IDE Windows XP Java
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Welcome to JavaRanch

what you have read is correct

from JLS


A blank final is a final variable whose declaration lacks an initializer.
Once a final variable has been assigned, it always contains the same value



in your case the blank variable is an instance variable, so you can only access the variable after the constructor execution. so it make sense to initialize i value in constructor.
remember if the variable i is static, then you need a static initializer instead of constructor to initialize i value

hth
 
Ranch Hand
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1
Eclipse IDE MySQL Database Tomcat Server
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also
the final instance variables area needed to be given value in the same line or in every constructor
this is because
before the constructor runs, the default values are assigned to the instance variables after the super class constructor has completed execution
so when we write
final int i ;
then the value i = 0 is automatically given to i
 
karry sharma
Greenhorn
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Thnx 4 the reply....i have checked out the JLS and now i am very sure of this fact.....
 
Sheriff
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Karthik please check your private messages for some administrative matter.

Thnx 4 the reply


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