Which of these options most closely matches the original design:

for (int i = 0; i < 10; i++) {
    System.out.println(i);
}
Explanation
The scope of the variable i, declared in the header of the cycle, is limited by this cycle.
In order to limit the scope of the variable you need to use an external block
{
  int i = 0;
  . . .
}

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