Ошибка в нахождении макс числа

public class Solution {
    public static void main(String[] args) throws Exception {
        int[] array = initializeArray();
        int max = max(array);
        System.out.println(max);
    }

    public static int[] initializeArray() throws IOException {
        BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));
        int[] list = new int[20];
        for (int i = 0; i < list.length; i++)
    {
      list[i] = Integer.parseInt(reader.readLine());
    }
        return null;
    }

    public static int max(int[] array) {
        int maximum = array[0];
        for(int j = 1; j < array.length; j++) {
        if(array[j] > maximum) {
            maximum = array[j];
        }
    }
    return maximum;
    }
}

public static int[] initializeArray() throws IOException {
        BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));
        int[] list = new int[20];
        for (int i = 0; i < list.length; i++)
    {
      list[i] = Integer.parseInt(reader.readLine());
    }
        return null;
    }