Difference between final and effectively final

Question

I\'m playing with lambdas in Java 8 and I came across warning local variables referenced from a lambda expression must be final or effectively final. I know tha

Answer 1

A variable is final or effectively final when it's initialized once and it's never mutated in its owner class. And we can't initialize it in loops or inner classes.

Final:

final int number;
number = 23;

Effectively Final:

int number;
number = 34;

Note: Final and Effective Final are similar(Their value don't change after assignment) but just that effective Final variables are not declared with Keyword final.