题解 | #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[] ss = new String[nums.length];
        StringBuilder sb = new StringBuilder();
        for(int i = 0; i < nums.length; i++) {
            ss[i] = String.valueOf(nums[i]);
        }
        Arrays.sort(ss,
            (String s1,String s2) -> {
                return Integer.valueOf(s1 + s2) - Integer.valueOf(s2+s1);
            }
//             new Comparator<String>(){
//                 @Override
//                 public int compare(String s1,String s2){
//                     return Integer.valueOf(s1 + s2) - Integer.valueOf(s2+s1);
//                 }   
//             }        

        );
        for(int i = nums.length-1; i >= 0; i--) {
            sb.append(ss[i]);
        }
        String res = sb.toString();

        return (res.charAt(0) == '0') ? "0" : res;
    }
}