Write code using following class diagram. Is it possible to extract polymorphic behavior from the given class design?

Question

Animal

+age: Int

+gender: String

+isMammal()

+talk()

Zoo

+name: String

+Address: String

+animals: Animals[]

+listAllAnimals()

Duck

+beakColor: String = “yellow”

+swim()

+quack()

+talk()

Fish

+sizeInFeet: Int

+canEat: boolean

-swim()

+quack()

+talk()

Answer 1

//**** Animal.java *****//

class Animal

{

protected int age;

protected boolean gender;

protected boolean mammal;

public Animal( int Age, boolean Gender, boolean Mammal)

{

this.age = Age;

this.gender = Gender;

this.mammal = Mammal;

}

public void SetAge(int n) { this.age = n; }

public void SetGenderMale() { this.gender=false; }

public void SetGenderFemale() { this.gender=true; }

public void SetMammal(boolean Mammal) { this.mammal = Mammal; }

public int GetAge() { return(age); }

public boolean IsMammal() { return(mammal); }

public boolean GetGender() { return(gender); }

public void talk() { }

public String SerializeToCSV()

{

return(

new String (

age + "," + gender + "," + mammal

)

);

}

}

//***** Duck.java *************//

class Duck extends Animal

{

protected String beakColor;

public Duck( String beak_color,int Age, boolean Gender, boolean Mammal)

{

super(Age,Gender,Mammal);

this.beakColor = beak_color;

}

public String GetBeakColor() { return(beakColor); }

public void swim() { System.out.println("swimming..."); }

public void quack() { System.out.println("quack"); }

@Override public void talk() { System.out.println("quack"); }

@Override public String SerializeToCSV()

{

return(

new String (

age + "," + gender + "," + mammal + "," + beakColor

)

);

}

}

//******** Fish.java *********//

class Fish extends Animal

{

protected int size;

protected boolean edible;

Fish (int n, boolean edible, int Age, boolean Gender, boolean Mammal)

{

super(Age,Gender,Mammal);

size = n;

this.edible = edible;

}

public int GetSize() { return(size); }

public boolean IsEdible() { return(edible); }

public void swim() { System.out.println("swimming...."); }

@Override public void talk() { System.out.println(" fish cannot talk "); }

@Override public String SerializeToCSV()

{

return(

new String (

age + "," + gender + "," + mammal + "," + size + "," + edible

)

);

}

}

//**** Zoo.java *********//

class Zoo

{

private String name;

private String address;

private Animal animals[];

private int numAnimals;

Zoo() { name=address=null; numAnimals=0; animals=null; }

public int GetNumAnimals() { return(numAnimals); }

public String GetZooName() { return(name); }

public String GetAddress() { return(address); }

public void SetName(String zooName) { this.name = new String(zooName) ; }

public void SetAddress(String zooAddr) { this.address = new String(zooAddr); }

public void SetAnimals( Animal animalArray[])

{

numAnimals = animalArray.length;

animals = animalArray;

}

public Animal IndexerGetIndexAt(int iIndexPos)

{

Animal animalReturn = null;

if ((iIndexPos>=0) && (iIndexPos<numAnimals))

{

animalReturn = animals[iIndexPos];

}

return(animalReturn);

}

public void listAllAnimals()

{

for (int iLoop=0; iLoop<numAnimals; iLoop++)

{

String animalBuffCSV = animals[iLoop].SerializeToCSV();

System.out.println(animalBuffCSV);

}

}

}

//******* main ***********//

class ZooMain

{

public static void main(String args[])

{

Duck duck = new Duck("yellow",1,true,true);

Fish fish = new Fish(6,true,1,true,true);

Zoo zoo = new Zoo();

zoo.SetName("Generic Zoo");

zoo.SetAddress("zoo address");

Animal animalArray [] = new Animal[2];

animalArray[0] = duck;

animalArray[1] = fish;

zoo.SetAnimals(animalArray);

zoo.listAllAnimals();

}

}