// 2D array

public class array_2d {
    public static void main(String args[]) {

	// create an array of arrays
	// here, we think "2D" array
	int[][] A = new int[2][2];
	
	// store values
	A[0][0] = 1;
	A[0][1] = 2;
	A[1][0] = 3;
	A[1][1] = 4;

	// print values
	// outer loop: think iterating for each row
	for (int i = 0; i <= 1; i++) {

	    // inner loop: think iterating for each column
	    for (int j = 0; j <= 1; j++)

		// now print each array element
		System.out.print(A[i][j] + " ");

	    // skip line
	    System.out.println();

	} // outer for loop

    } // method main

} // class array_2d

/* Output
1 2
3 4
*/