How to use Final Variables belonging to one block in another? - JAVA

final int a,b;

if(condition1)
 {
  a=cal.get(Calendar.HOUR);
  b=cal.get(Calendar.MINUTE);
 }

if (condition2)
 {
  int c=b+a;
  display(c);
 } 

In this type of code the compiler is asking to intialize a and b, which I can't do until the condition1 is met. and a and b being final is mandatory as the values of hours and minutes keep changing. The above written code is very generalized just to give you an idea of my problem.