가장 큰 수

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

프로그래머스

def solution(numbers):
    number_st = [str(num) for num in numbers]
    number_st = number_st.sort(key=lambda x: x * 3, reverse=True)
    return ''.join(str(number_st))

 

import java.util.Arrays;
class Solution {
    public String solution(int[] numbers) {
        StringBuilder answer = new StringBuilder();
        String[] nums = new String[numbers.length];
        for (int i = 0; i < nums.length; i ++) {
            nums[i] = String.valueOf(numbers[i]);
        }
        Arrays.sort(nums, (a, b) -> (b + a).compareTo(a + b));

        if (nums[0].equals("0")) return "0";

        for (String s: nums) answer.append(s);

        return answer.toString();
    }
}