Question

The UML diagram bellow shows an example for simple chain of inheritance relationship where ClassC inherits ClassB’s members, including the ones that ClassB inherited from ClassA. ClassA constructor has a println statement that prints "Hello This is ClassA", ClassB constructor has a println statement that prints "Hello this is ClassB" and ClassC constructor has a println statement that prints "Hello this is ClassC". ClassC is the driver class. If you create an object of ClassC,you will get the following output: Hello this is ClassA Hello this is ClassB Hello this is ClassC Now write a Java program that meets above conditions.

Answer 1

Program:

//Program to be saved as ClassC.java

//classA
class ClassA
{
   //constructor of ClassA
   public ClassA()
   {
       //println statement in the constructor
       System.out.println("Hello this is ClassA");
   }
}

//classB that extends classA
class ClassB extends ClassA
{
   //constructor of ClassB
   public ClassB()
   {
       //println statement in the constructor
       System.out.println("Hello this is ClassB");
   }
}

////classC that extends classB, this our driver class also
public class ClassC extends ClassB
{
   //constructor of ClassC
   public ClassC()
   {
       //println statement in the constructor
       System.out.println("Hello this is ClassC");
   }
  
   //driver program
   public static void main(String[] args)
   {
       //create an object for classC
       ClassC obj=new ClassC();
       //creating an object for ClassC calls the constructors of the parent class
       //along with its own constructor and prints all the statements
   }

}

Output: