Why would 0042 sound 34 to int?

Question

   public static void main(String[] args) throws ParseException, UnsupportedEncodingException {
    int rishav = 42;
    System.out.println(rishav);
}

this gives 42, but the below gives 34 :-

public static void main(String[] args) throws ParseException, UnsupportedEncodingException {
    int rishav =0042;
    System.out.println(rishav);
}

If I need to transform an integer to trim its leading zeros, what do I do, most feasible.