Simple sort strategy on an object of animals. Group by animal class type.

RunAnimalStrategyDemo.java

/**
 *
 * Run a demo for supplying different strategies to sort a list
 * of animals.
 * 
 * @author keaplogik
 */
public class RunAnimalStrategyDemo {

    public static void main(String[] args) {
        
        //build the animal list.
        Animal[] animals = buildAnimalList();
        
        System.out.println("\tGROUP Animals by same class type");
        System.out.println("----------------------------------------------");

        /**
         * This is an example of implementing strategy to sort 
         * Animals by their animal class. Order doesn't matter, but we want to 
         * ensure that animals are grouped by their animal class property.
         */
        Arrays.sort(animals, new Comparator<Animal>() {
            public int compare(Animal firstAnimal, Animal secondAnimal) {
                return firstAnimal.getAnimalClass().hashCode() - 
                        secondAnimal.getAnimalClass().hashCode();
            }
        });

        for (Animal animal : animals) {
            System.out.println(animal.toString());
        }
    }

    public static Animal[] buildAnimalList(){
        final Animal[] animals = new Animal[10];

        animals[0] = new SimpleAnimal(Animal.AnimalClass.MAMMAL, 
                "Dog", true, Color.GRAY);
        animals[1] = new SimpleAnimal(Animal.AnimalClass.MAMMAL, 
                "Cat", true, Color.YELLOW);
        animals[2] = new SimpleAnimal(Animal.AnimalClass.AMPHIBIAN,
                "Frog", true, Color.GREEN);
        animals[3] = new SimpleAnimal(Animal.AnimalClass.BIRD,
                "Crow", true, Color.BLACK);
        animals[4] = new SimpleAnimal(Animal.AnimalClass.BIRD,
                "Cardinal", true, Color.RED);
        animals[5] = new SimpleAnimal(Animal.AnimalClass.ARTHROPOD,
                "Mantis", false, Color.GREEN);
        animals[6] = new SimpleAnimal(Animal.AnimalClass.ARTHROPOD,
                "Spider", false, Color.ORANGE);
        animals[7] = new SimpleAnimal(Animal.AnimalClass.MAMMAL, 
                "Tiger", true, Color.ORANGE);
        animals[8] = new SimpleAnimal(Animal.AnimalClass.MAMMAL, 
                "Bear", true, Color.BLACK);
        animals[9] = new SimpleAnimal(Animal.AnimalClass.BIRD, 
                "Owl", true, Color.BLACK);
                
        return animals;
    }
}