Final Variables

Final Variables in JAVA

You can declare a variable in any scope to be final, including parameters to methods and constructors. The value of a final variable cannot change after it has been initialized. To declare a final variable, use the final keyword in the variable declaration before the type

Final in aFinalVar=0;

The previous statement declares a final variable and initializes it, all at once. Subsequent attempts to assign a value to aFinalVar result in a compiler error. You may, if necessary, defer initialization of a final variable. Simply declare the variable and initialize it later, like this:

Final int blankfinal;

….

Blankfinal =0;

A final variable that has been declared but not yet initialized is called a blank final. Again, once a final variable has been initialized it cannot be set and any later attempts to assign a value to blankfinal result in a compile-time error.