largest number

public String (int[] nums) {
    if (nums == null || nums.length == 0)
        return "";
    String[] str = Arrays.toString(nums).split("[\[\]]")[1].split(", ");
    Arrays.sort(str, new Comparator<String>(){
        public int compare(String str1, String str2) {
            String s1 = str1 + str2, s2 = str2 + str1;
            return -1 * s1.compareTo(s2);
        }
    });
    if (str[0].equals("0"))
        return "0";
    StringBuilder sb = new StringBuilder();
    for (String s : str)
        sb.append(s);
    return sb.toString();
}