[정렬] 가장 큰 수 (JAVA)

https://school.programmers.co.kr/learn/courses/30/lessons/42746?language=java 

프로그래머스

import java.io.IOException;
import java.util.Arrays;
import java.util.Comparator;

class Solution {
    public String solution(int[] numbers) throws IOException {
        StringBuilder answer = new StringBuilder();
        String[] result = new String[numbers.length];
        for(int i = 0 ; i < numbers.length; i++)
            result[i] = String.valueOf(numbers[i]);

        Arrays.sort(result, new Comparator<String>(){
            @Override
            public int compare(String o1, String o2){
                return (o2+o1).compareTo(o1+o2);
            }
        });
        
        for(String e : result)
            answer.append(e);
        if(answer.charAt(0) == '0') return "0";
        return answer.toString();
    }
}