Java: An interface Terrestrial. It contains - String walk An interface class Aqu

Question

Java:

An interface Terrestrial. It contains - String walk An interface class Aquatic. It contains: - String swim) An abstract class Animal. It contains public String sound I/set the default sounds to "No Sound" A concrete class Cougar extends Animal implements Terrestrial -Override walk) -Override sound ) Override toString O://call the walk) and sound ) methods A concrete class Fish extends Animal implements Aquatic Uses default sound. Override swim) Override toString //call the swim) methods A concrete class Turtle extends Animal implements Terrestrial, Aquatic -Override walk) Override swim) -Override sound ) Override toString //call the walk),swim), and sound) methods Driver program ArrayList of Animals: Cougar, Fish, and Turtle - Print all of the objects using the toString) method

Explanation / Answer

Terrestrial.java

package animal.details;
public interface Terrestrial { //Terrestrial interface according to the given description
String walk(); //incomplete method walk() which will be completed in the class that will inherit it.
}

Aquatic.java

package animal.details;
public interface Aquatic { //Aquatic interface according to the given description
String swim();   //incomplete method swim() which will be completed in the class that will inherit it.
}

Animal.java

package animal.details;

public abstract class Animal { //Abstract class according to the given description

public String sound(){  //Sound() method which returns default value
  return null;
  
}
}

Cougar.java

package animal.details;
public class Cougar extends Animal implements Terrestrial{
@Override
public String walk() {
  return "Walks..."; //returns that Cougar can walk
  // TODO Auto-generated method stub
  //return null;
}
@Override
public String sound() {
  return "Rawr!"; //returns the sound of Cougar
  // TODO Auto-generated method stub
  //return null;
}
@Override
public String toString() {
  String w=walk(); //Reading the values from overridden walk() method
  String s=sound(); //Reading the values from overridden sound() method
  return " Cougar "+w+" "+"Sound:"+s; //Formatting the read values into proper format
  // TODO Auto-generated method stub
  //return null;
}
}

Turtle.java

package animal.details;

public class Turtle extends Animal implements Terrestrial, Aquatic{

@Override     //Annotation is used to check if the method is getting overridden or not
public String swim() {
  return "swims...";  //returns that Turtle can swim
  // TODO Auto-generated method stub
  //return null;
}

@Override
public String walk() {
  return "walks...";  //returns that Turtle can walk
  // TODO Auto-generated method stub
  //return null;
}

@Override
public String sound() {
  return "ehhhhhh..."; //returns the sound of Turtle
  // TODO Auto-generated method stub
  //return null;
}

@Override
public String toString() {
  String w=walk();  //Reading the values from overridden walk() method
  String s=swim();  //Reading the values from overridden swim() method
  String so=sound();  //Reading the values from overridden sound() method
  return " Turtle "+s+" Turtle "+w+" Sound: "+so; //Formatting the read values into proper format
  // TODO Auto-generated method stub
  //return null;
}

}

Fish.java

package animal.details;
public class Fish extends Animal implements Aquatic{
@Override    //Annotation is used to check if the method is getting overridden or not
public String swim() {
  return "Swims..."; //returns that Fish can swim
  // TODO Auto-generated method stub
  //return null;
}
@Override
public String toString() {
  String s=swim(); //Reading the values from overridden swim() method
  String so=sound(); //Reading the values from overridden sound() method
  if(so==null){  //if sound is null then print No Sound
   so="No Sound";
  }
  return " Fish "+s+" "+"Sound:"+so; //Formatting the read values into proper format
  // TODO Auto-generated method stub
  //return null;
}
}

DriverProg.java

package animal.details;
import java.util.ArrayList;
public class driverProg {
public static void main(String[] args) { //execution starts from main() method
  ArrayList<String> a=new ArrayList<String>(); //creating an ArrayList of type String
  a.add("Cougar");        //Adding elements into the ArrayList using the add() method of ArrayList
  a.add("Fish");
  a.add("Turtle");
  Turtle t=new Turtle();       //creating reference variable for class Turtle
  System.out.println(t.toString());    //calling to.String of Turtle class and displaying its contents
  Fish f=new Fish();        //creating reference variable for class Fish
  System.out.println(f.toString());    //calling to.String of Fish class and displaying its contents
  Cougar c=new Cougar();       //creating reference variable for class Cougar
  System.out.println(c.toString());    //calling to.String of Cougar class and displaying its contents
}             //end of main()
}

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