Hi, help me understand this problem in Java!

Write a method that accepts a 2-D array of integers as a parameter and that returns a 1-D array with the contents of the original 2-D array in the order they would appear clockwise starting from top-left. You may assume that the 2-D array is rectangular, that is, that each row of the 2-D array contains the same number of columns. You may also assume that the 2-D array contains at least one row and column. Your method should not modify the array that is passed in.