I want an explanation as to why the code below can compile. Shouldn't declaring a variable within a while loop cause the variable to be declared repeatedly, causing an error?

int i = 1; while (i <= 2) { int j = 1; while (j <= 3) { int k = 1; while (k <= 4) { System.out.print("*"); k++; } System.out.print("!"); j++; } System.out.println(); i++; }