What is blank final variable

Question

I know about final variable. But, I came across blank final variable as well. Can you help me understand that ?

Answer 1

A final variable in Java can be assigned a value only once, we can assign a value either in a declaration or later.

    final int i = 10;
    i = 30; // Error because i is final.

A blank final variable in Java is a final variable that is not initialized during declaration. Below is a simple example of blank final.

    // A simple blank final example 
    final int i;
    i = 30;

How are values assigned to blank final members of objects?
Values must be assigned in constructor.