int[][] array = new int[0][5];
int n = array[0].length;

int[][] array = new int[5][5];
int n = array[0].length;

int[][] array = new int[0][5];

int[][] array = new int[1][5];

int[] array = new int[5];

int[][] a = new int[0][5];

int[][] a = new int[2][4];
a = {(1,2,3,4}, {5,6,7,8}}
System.out.println(a.length);// would return `2`

int[][] a = new int[x][];
for (int i = 0; i < x; i++)
  a[i] = new int[y];