public class ClassA
{
//default constructor not shown ...
public void method1()
{ /* implementation of method1 */ }
}
public class ClassB extends ClassA
{
//default constructor not shown ...
public void method1()
{ /* different implementation from method1 in ClassA*/ }
public void method2()
{ /* implementation of method2 */ }
}
Consider the following declarations in a client class.
ClassA ob1 = new ClassA();
ClassA ob2 = new ClassB();
Which of the following method calls will cause an error?
I ob1.method2();
II ob2.method2();
III ((ClassB) ob1).method2();
(A) I only
(B) II only
(C) III only
(D) I and III only
(E) I, II, and III