Question

JAVA

1. Create an Interface Vehicle. Declare one public void method in it paint( ).

2. Create a class Car. Implements Vehicle. It's paint() method prints "Car Painted". It's drive( ) method prints "Car Driven".

3. Create a class Bus. Implements Vehicle. It's paint() method prints "Bus Painted" . It's drive( ) method prints "Bus Driven".  

4. Create a method AutoWork which accepts an object of type Vehicle. The method makes a call to the vehicle's paint( ) and drive() methods.

5. In the main method of your Main class, create a reference and object of Car class. Pass it to the AutoWork method.

6. In the main method of your Main class, create a reference and object of Bus class. Pass it to the AutoWork method.

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7. In the main method of your Main class, create a reference v of Vehicle interface and object of Car class. Pass it to the AutoWork method. (You may have to remove/comment the call to the drive() method in AutoWork)

8. Using the same reference v, create object of Bus. Pass it to the AutoWork method. (Again you may have to remove/comment the call to the drive() method in AutoWork)

Answer 1

CODE :

import java.util.*;

interface Vehicle
{
   public void paint();
}

class Car implements Vehicle
{
   public void paint()
   {
       System.out.println("Car painted");
   }
   public void drive()
   {
       System.out.println("Car Driven");
   }
}

class Bus implements Vehicle
{
   public void paint()
   {
       System.out.println("Bus painted");
   }
   public void drive()
   {
       System.out.println("Bus Driven");
   }
}

class JavProg
{
   public void AutoWork(Vehicle v)
   {
       v.paint();
       //v.drive();
   }

   public static void main(String args[])
   {
      
       JavProg tester =new JavProg();
       Vehicle v;//reference of vehicle interface

       Car c = new Car();
       v = c;//holding car object
      
       tester.AutoWork(v);//calling the auto work passing car object
      
       Bus b = new Bus();
       v = b;
       tester.AutoWork(v);
      
   }
}

OUTPUT :