Let suppose If there are two variables like num 1 and num 2 and there is a method having that num 1 and num 2. now we want to call that method at the end so we can use this call back method .
Let suppose If there are two variables like num 1 and num 2 and there is a method having that num 1 and num 2. now we want to call that method at the end so we can use this call back method .