Sort numbers with bubble sort, and don't lose zeros. Actually we don't change String array.

    for (int i = 0; i < s.length-2; i++) {
        for (int j = 1; j < (n-i); j++) {
            BigDecimal sj = new BigDecimal(s[j]);
            BigDecimal sj1 = new BigDecimal(s[j-1]);
            if(sj.compareTo(sj1) == 1){
                String temp = s[j];
                s[j] = s[j-1];
                s[j-1] = temp;
            }
        }       
    }