Difference between final variables and compile time constant

Question

What is the difference between final variables and compile time constants?

Consider the following code

final int a = 5;
final int b;
b=6;
int x=0;
switch         


        

Answer 1

final int b; can be assigned once and value is not sure, that will be decided on runtime depending on conditions. that is the reason, even if being a final variable, it is not COMPILE TIME constant although it will be a RUN TIME constant and case needs compile time constants.