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
