Question

In Java

1. Create a class called "TestZoo" that holds your main method.
2. Write the code in main to create a number of instances of the objects. Create a number of animals and assign a cage and a diet to each. Use a string to specify the diet.
3. Create a zoo object and populate it with your animals. Declare the Animal object in zoo as
   Animal[] animal = new Animal[3] and add the animals into this array. Note that this zoo holds only 3 animals.
4. Use a "for" loop to print the following:
   I am Laila the lion and I live in cage 1. I eat fresh meat.
   I am Hahn the hawk and I live in cage 2. I eat rodents.
   I am Deepak the deer and I live in cage 2. I eat fresh grass.
5. Create a UML diagram of this zoo using boxes to represent each class : Add the relevant instance variables for each class. Indicate your associations and whether they are aggregation or composition. Indicate the one-to-many, one-to-one, etc. relationships.
6. Instance variables would include String animalType, String animalName, String cageType, and String animalFood,

Answer 1

Animal.java

public class Animal {
private String animalType, animalName, cageType, animalFood;
  
public Animal()
{
this.animalType = "";
this.animalName = "";
this.cageType = "";
this.animalFood = "";
}

public Animal(String animalType, String animalName, String cageType, String animalFood)
{
this.animalType = animalType;
this.animalName = animalName;
this.cageType = cageType;
this.animalFood = animalFood;
}

public String getAnimalType() {
return animalType;
}

public void setAnimalType(String animalType) {
this.animalType = animalType;
}

public String getAnimalName() {
return animalName;
}

public void setAnimalName(String animalName) {
this.animalName = animalName;
}

public String getCageType() {
return cageType;
}

public void setCageType(String cageType) {
this.cageType = cageType;
}

public String getAnimalFood() {
return animalFood;
}

public void setAnimalFood(String animalFood) {
this.animalFood = animalFood;
}
  
@Override
public String toString()
{
return ("I am " + this.animalName + " the " + this.animalType
+ " and I live in cage " + this.cageType + ". I eat " + this.animalFood + ".");
}
}

Zoo.java

public class Zoo {
private Animal animal[];
private int size;
private static int count = 0;
  
public Zoo()
{
this.size = 3;
this.animal = new Animal[size];
}
  
public void addAnimal(Animal animal)
{
if(count == size)
throw new ArrayIndexOutOfBoundsException("Cannot add more than 3 animals!");
else
this.animal[count++] = animal;
}
  
public void printAnimalDetails()
{
for(int i = 0; i < animal.length; i++)
{
System.out.println(animal[i].toString());
}
System.out.println();
}
}

TestZoo.java

public class TestZoo {
  
public static void main(String[] args)
{
Zoo zoo = new Zoo();
try
{
Animal lion = new Animal("lion", "Laila", "1", "fresh meat");
Animal hawk = new Animal("hawk", "Hahn", "2", "rodents");
Animal deer = new Animal("deer", "Deepak", "2", "fresh grass");
  
zoo.addAnimal(lion);
zoo.addAnimal(hawk);
zoo.addAnimal(deer);
  
zoo.printAnimalDetails();
  
}catch(ArrayIndexOutOfBoundsException aio){
System.out.println(aio.getMessage());
}
}
}

**********************************************************************************************************************************************

SCREENSHOT:

UML Diagram:

Explanation: The relation between the two classes is Composition; the Zoo class is composed of the Animal class. If the Zoo does not exist, the Animals will also cease to exist. In other words, the existence of the Animal class depends on the life cycle of the Zoo class.