// array of arrays

public class aoa0 {
    public static void main(String args[]) {

	// create an array of arrays
        // each element of A will be an array
        int[][] A = new int[2][2];

        // create array a0 and store values
        int[] a0 = new int[2];
        a0[0] = 11;
        a0[1] = 12;
	
        // create array a1 and store values
        int[] a1 = new int[2];
        a1[0] = 21;
        a1[1] = 22;
	
        // store arrays a0 and a1 as 1st and 2nd
        // elements of array A
        // Array A now stores 1D arrays as each element:
        A[0] = a0;
        A[1] = a1;

        // How do you access such a beast?
        // Use A[i][j] 
        // The "i" refers to the elements of A
        // The "j" refers to elements of the elements of A

        System.out.println();
        for (int i = 0; i <= 1; i++) {
            for (int j = 0; j <= 1; j++)
                System.out.print(A[i][j] + " ");
            System.out.println();
        }

    } // method main

} // class array_of_arrays

/* Output

11 12 
21 22 
*/