Learn Java Programming - Final Reference Variables Tutorial
When the final keyword is applied to a reference variable and the variable has been initialized, that reference variable cannot be reassigned to a different object instance. It is important to note that when final is applied to a reference variable it does not prevent the members of the object instance from changing values. A final reference variable can only be assigned to a reference of an object instance once and only once. The value does not need to be assigned when the reference variable is declared; this kind of a reference variable is called a blank final variable. A blank final instance reference variable must be assigned a value inside of a constructor or a compiler error will occur. A blank final local reference variable must be assigned a value before it is used. The optional common naming convention for final variables is to be in uppercase with an underscore (_) separating the words.
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