배열 두배 만들기

https://school.programmers.co.kr/learn/courses/30/lessons/120809

• 문제 풀이

import java.util.*;

class Solution {
    public int[] solution(int[] numbers) {
        int[] doubledNumbers = new int[numbers.length];
        
        for (int i = 0; i < numbers.length; i++) {
            doubledNumbers[i] = numbers[i] * 2;
        }
        
        return doubledNumbers;
    }
}

import java.util.*;

class Solution {
    public int[] solution(int[] numbers) {
        List<Integer> list = new ArrayList<>();
        
        for (int num : numbers) {
            list.add(num * 2);
        }
        
        int[] result = new int[list.size()];
        for (int i = 0; i < list.size(); i++) {
            result[i] = list.get(i);
        }
        
        return result;
    }
}