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// A superclass reference can refer to a subclass object.

class X3 {

int a;

public X3(int i) {

// TODO Auto-generated constructor stub

a = i;

}

}

class Y3 extends X3 {

int b;

public Y3(int i, int j) {

// TODO Auto-generated constructor stub

super(j);

b = i;

}

}

public class SupSubRef2 {

public static void main(String[] args) {

X3 x3 = new X3(10);

Y3 y3 = new Y3(5, 6);

System.out.println("X.a: " + x3.a);

x3 = y3;

System.out.println("X.a: " + x3.a);

// X references know only about X members

x3.a = 19; // OK

// x3.b = 27; // Error, X does not have a b member.

}

}