Number-series naming (a1, a2, .. aN) is the opposite of intentional naming. Such names are not disinformative—they are noninformative; they provide no clue to the author’s intention. Consider:    public static void copyChars(char a1[], char a2[]) {      for (int i = 0; i < a1.length; i++) {        a2[i] = a1[i];      }    } This function reads much better when source and destination are used for the argument names.