2차배열을 1차배열로 변경 (주석달기)

2차배열을 1차배열로 변경법

        int arr2[][] = { { 1, 2, 3 }, { 4, 5, 6 } };
 
        int arr1[];
        arr1 = arr2ToArr1(arr2);
        for (int i = 0; i < arr1.length; i++) {
            System.out.println("arr1 [" + i + "]" + arr1[i]);
        }
 
    }
 
    static int[] arr2ToArr1(int arr2[][]) { // [2][3]
        int rArr[] = new int[arr2.length * arr2[0].length];
        int n = 0;
 
        for (int i = 0; i < arr2.length; i++) {
            for (int j = 0; j < arr2[0].length; j++) {
                rArr[(arr2[0].length * i) + j] = arr2[i][j];
 
            }
 
        }
        return rArr;
    }
 
}