Question

22) What is printed by the following code?

public class Inherit
{
abstract class Speaker
{
abstract public void speak( );
}
class Cat extends Speaker
{
public void speak( )
{
System.out.println("Woof!");
}
}
class Dog extends Speaker
{
public void speak( )
{
System.out.println("Meow!");
}
}
Inherit( )
{
Speaker d = new Dog( );
Speaker c = new Cat( );
( );
( );
}
public static void main(String[ ] args)
{
new Inherit( );
}
}
a) Woof!
Meow!
b) Meow!
Woof!
c) Meow!
Meow!
d) Woof!
Woof!
e) None of the above

Answer 1

The code example demonstrates polymorphism and method overriding but contains errors and incomplete method calls, which will result in a compilation error and thus, nothing will be printed.

Step-by-step explanation:

The code in question involves an example of polymorphism where an abstract class Speaker is extended by two classes, Cat and Dog. In the constructor of the class Inherit, objects of Dog and Cat are created but referenced by Speaker type variables.

However, when calling the speak method for each object, the overridden methods in the respective classes will be executed, which means the System.out.println statements inside the speak methods of Cat and Dog classes will be printed. But there is a typo in the code provided. The Cat class should print "Meow!" and the Dog class should print "Woof!". Since the speak method calls are missing, the code will not compile and therefore nothing will be printed.