import java.io.*;

class Test
{
    static class A
    {
        public int i;
        public int k = 1;

        public A()
        {
            i = 2;
        }
    }

    static class B extends A implements Serializable
    {
        public int j = 3;

        public B()
        {
            j = 4;
        }
    }

    public static void main(String[] args) throws IOException, ClassNotFoundException
    {
        B b = new B();

        b.i = 5;
        b.j = 6;
        b.k = 7;

        PipedInputStream pis = new PipedInputStream();
        PipedOutputStream pos = new PipedOutputStream();

        pis.connect(pos);

        ObjectOutputStream oos = new ObjectOutputStream(pos);
        ObjectInputStream ois = new ObjectInputStream(pis);

        oos.writeObject(b);

        B b2 = (B)ois.readObject();

        System.out.printf("i: %d, j: %d, k: %d%n", b2.i, b2.j, b2.k);   //i: 2, j: 6, k: 1
    }
}