arrayList
Create a 1D array (using an ArrayList).
The size of the 1d array is n.
Create a 2D array (using ArrayLists). The result is an array list of columns, where each item in each column is null.
The size of the 2d array is (x,y)
Create a 3D array (using ArrayLists). The result is an array list of columns, where each item in each column is null.
The size of the 3d array is (x,y,z).