public class TestADT {

    public static void main(String[] args) {

	Printable m = new MyMatrix2D(new Integer[][] 
	    {
		{ new Integer(1),new Integer(2),new Integer(3) },
		{ new Integer(4),new Integer(5),new Integer(6) }
	    } );
	m.print();
    }
}

interface Printable {
    void print();
}

abstract class Matrix2D implements Printable {
    protected final int size1;
    protected final int size2;
    protected Object[][] a;
    public Matrix2D(Object[][] a) {
	size1 = a.length;
	size2 = a[0].length;
	this.a = a;
    }
    abstract public void print();
}

class MyMatrix2D extends Matrix2D implements Printable {
    public MyMatrix2D(Object[][] a) {
	super(a);
    }
    public void print() {
	for(int i=0;i<size1;i++) {
	    for(int j=0;j<size2;j++)
		System.out.print(a[i][j]+" ");
	    System.out.println();
	}
	System.out.println();
    }
}