Loop counters should not be assigned to from within the loop body

Loop counters should not be modified in the body of the loop. However other loop control variables representing logical values may be modified in the loop, for example a flag to indicate that something has been completed, which is then tested in the for statement.

The following code:

String[] names = new String[]{ "Jack", "Jim", null, "John" };
for (int i = 0; i < names.length; i++) {
  if (names[i] == null) {
    i = names.length;                                             // Non-Compliant
  } else {
    System.out.println(names[i]);
  }
}

should be refactored into:

String[] names = new String[]{ "Jack", "Jim", null, "John" };
for (String name: names) {
  if (name == null) {
    break;                                                        // Compliant
  }
  System.out.println(name);
}