【算法题】把数组中的数排成一个最小的数

import com.dianping.cat.util.StringUtils;

import java.util.Arrays;
import java.util.Comparator;


public class Test5 {
    public static void main(String[] args) {
        int[] input = {3, 32, 321};
        System.out.println(joinToMinNumber(input));
    }

    public static String joinToMinNumber(int[] input) {
        if (input == null || input.length == 0) {
            return "";
        }
        String[] strArr = new String[input.length];
        for (int i = 0; i < input.length; i++) {
            strArr[i] = String.valueOf(input[i]);
        }

        Arrays.sort(strArr, new Comparator() {
            @Override
            public int compare(String o1, String o2) {
                return (o1 + o2).compareTo(o2 + o1);
            }
        });

        return StringUtils.join(strArr, "");
    }
}