Efficiency of Java code with primitive types

Question

I want to ask which piece of code is more efficient in Java? Code 1:

void f()
{
 for(int i = 0 ; i < 99999;i++)
 {
  for(int j = 0 ; j < 99999;j++)
  {         


        

Answer 1

The second is worse.

Why? Because the loop variable is scoped outside the loop. i and j will have a value after the loop is done. Generally that isn't what you want. The first scopes the loop variables so it's only visible within the loop.