大二下学期

public class HBuilder

{

    public House Create()

    {

        return new House();

    }

}

public class House

{

}

public class Painter

{

    public Picture Draw(Pen p)

    {

        //……
        Picture pic =new Picture();
        p.Line(pic);

        return pic;

    }

}

public class Picture

{

}

public class Pen

{
        public void Line(Picture p){
                //……
        }

}

public class Painter

{

    public Picture Draw(Pen p)

    {

public class Painter

{

    public Picture Draw(Pen p)

    {

class Soldier:GameObj

{