[문제링크 - 프로그래머스 - 최댓값 만들기] https://school.programmers.co.kr/learn/courses/30/lessons/120847
class Solution {
public int solution(int[] numbers) {
int answer = 0;
Arrays.sort(numbers);
answer = numbers[numbers.length-1] * numbers[numbers.length-2];
return answer;
}
}