牛客网：NC111 最大数

import java.util.*;


public class Solution {
    /**
     * 最大数
     * @param nums int整型一维数组 
     * @return string字符串
     */
    public String solve (int[] nums) {
        // write code here
        String[] arr = new String[nums.length];
        StringBuilder sb = new StringBuilder();
        for (int i = 0; i < nums.length; i++) arr[i] = nums[i] + "";
        Arrays.sort(arr, (a,b) -> ( b + a).compareTo(a + b));
        for (int i = 0; i < arr.length; i++) sb.append(arr[i]);
        return sb.toString().charAt(0) == '0' ? "0" : sb.toString();
    }
}