Question

5) This question deals with the concepts of subtyping. For this problem, assume that the following classes and their subclasses are defined: public class A public void ma (B b) () public class D extends B! public void md (Bb) 0 public class B extends A public void mb (D d) () public class E extends C public void me (A a) () public class C extends A public void mc (cc) () public class F extends DI public void mf(cc) (1 (C) Draw the inheritance graph for the above classes. (d) Assume that the following variables are defined: A a; B b; CCDd; Ee; Ff. For each of the following statements write "Yif the statement is type-correct or "N" if the statement is not type correct: Is it type correct? Statement f.mc (b); e.md (d); d.ma (c); c.mb (e); f.mb (b); C.mc (e); b.ma (e); b.ma (a); b = a; a = d = e; |

Answer 1

c.) Inheritance Graph

class A class B class C class D class E class F

d)

Statement	Is it Type Correct
f.mc(b);	N
e.md(d);	N
d.ma(c);	N
c.mb(e);	N
f.mb(b);	N
c.mc(e);	N
b.ma(e);	N
b.ma(a);	N
b=a;	N
a=d=e;	N