Static Final Variable in Java

Question

Possible Duplicate    private final static attribute vs private final attribute       What s the difference between declaring a variable as  static final int x   5    or  final int x   5    If I only want to the variable to be local  and constant  cannot be changed later    Thanks

User · Answer

In first statement you define variable  which common for all of the objects  class static field    In the second statement you define variable  which belongs to each created object  a lot of copies    In your case you should use the first one

User · Answer

Declaring the field as  final  will ensure that the field is a constant and cannot change  The difference comes in the usage of  static  keyword   Declaring a field as static means that it is associated with the type and not with the instances  i e  only one copy of the field will be present for all the objects and not individual copy for each object  Due to this  the static fields can be accessed through the class name   As you can see  your requirement that the field should be constant is achieved in both cases  declaring the field as  final  and as  static final     Similar question is private final static attribute vs private final attribute  Hope it helps

User · Answer

For the primitive types  the  final static  will be a proper declaration to declare a constant  A non-static final variable makes sense when it is a constant reference to an object  In this case each instance can contain its own reference  as shown in JLS 4 5 4   See Pavel s response for the correct answer

User · Answer

Just having final will have the intended effect   final int x   5       x   10     this will cause a compilation error because x is final   Declaring static is making it a class variable  making it accessible using the class name  lt ClassName gt  x

[java] Static Final Variable in Java

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