Question

Java Programming, I have already finished SportCar and Airplane.

Answer 1

Short Summary:

• Implemented Playground.java to call respective methods based on the instances in the array

Playground.java

//This class creates instances and adds to Object array
public class Playground {

   public static void main(String[] args) {
       //Create instances for sportscar and airplane
       SportsCar sportsCar1=new SportsCar();
       SportsCar sportsCar2=new SportsCar();
       Airplane airplane1=new Airplane();
       Airplane airplane2=new Airplane();
       //Create generic object array
       Object[] vehicle= {sportsCar1,sportsCar2,airplane1,airplane2};

       //Iterate through Object array and check if the object is Sprotscar or Airplane
       for(Object obj:vehicle)
       {
           //Check if array element is instance of Sportscar
           if(obj instanceof SportsCar)
           {
               ((SportsCar) obj).sound();
           }
           //else it is instance of Sportscar
           else
           {
               ((Airplane) obj).changeSpeed();
           }
       }
   }

}

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