compareTo字符串排序

import java.util.*;


public class Solution {
    /**
     * 代码中的类名、方法名、参数名已经指定，请勿修改，直接返回方法规定的值即可
     *
     * 
     * @param numbers int整型一维数组 
     * @return string字符串
     */
    public String PrintMinNumber (int[] numbers) {
        // write code here
        if(numbers.length == 0)
            return "";
        String[] nums = new String[numbers.length];
        for(int i = 0; i < nums.length; i++)
            nums[i] = "" + numbers[i];
        Arrays.sort(nums, (o1, o2) -> (o1 + o2).compareTo(o2 + o1));
        StringBuilder sb = new StringBuilder();
        for(int i = 0; i < nums.length; i++)
            sb.append(nums[i]);
        return sb.toString();
    }
}