AwkwardCritter.java

import java.util.Random;

public class AwkwardCritter extends Critter {

	public AwkwardCritter() {
		super();
	}

	public void passDay() {
		changeAge(showAge() + 1);
		super.action("Eat", 85, 2, 20);
		super.action("Sleep", 50, 9, 2);
		meditate();
		yodel();
	}

	public String displayType() {
		return "Awkward";
	}

	public void meditate() {
		Random r = new Random();
		int randomInt = r.nextInt(100) + 1;

		if (randomInt > 50) {
			changeHealth(showHealth() + 2);
		} else {
			changeHealth(showHealth() - 7);
		}
	}

	public void yodel () {
		if(showHealth() > 80) {
			if (showLuck() > 7) {
				changeHealth(showHealth() + 3);
			} else {
				changeHealth(showHealth() + 2);
			}
		}
	}

}

Critter.java

import java.util.Random;

public abstract class Critter {

	int age;
	int health;
	int luck;

	public Critter() {
		age = 0;
		health = 100;
		Random r = new Random();
		luck = 1 + r.nextInt(10);
	}

	public String toString() {
		return displayType() + " Critter" + ":\n   Age: " + age + "\n   Health: " + health + "\n   Luck: " + luck + "\n";
	}

	public boolean calculateChances(int percent) {
		int newChance = percent + ((showLuck() * 3) - 15);

		Random r = new Random();
		int randomInt = r.nextInt(100) + 1;

		return (randomInt <= newChance);
	}

	public abstract void passDay();

	public abstract String displayType();

	public void action(String action, int chance, int benefit, int damage) {
		boolean success = calculateChances(chance);
		if(success == true) {
			health += benefit;
		} else {
			health -= damage;
		}

		if (health > 100) {
			health = 100;
		} else if (health < 0) {
			health = 0;
		}
	}

	public int showAge() {
		return age;
	}

	public void changeAge(int a) {
		age = a;
	}

	public int showHealth() {
		return health;
	}

	public void changeHealth(int h) {
		health = h;
	}

	public int showLuck() {
		return luck;
	}

	public void changeLuck(int l) {
		luck = l;
	}

}

Environment.java

public class Environment {

	private Critter[] critters;

	public static void main(String[] args) {
		Environment environment = new Environment(1);
		environment.gogo(30);
	}

	public Environment(int foo) {
		critters = new Critter[foo*3];

		for(int i=0; i<foo; i++) {
			critters[i] = new AwkwardCritter();
		}

		for(int i=0; i<foo; i++) {
			critters[foo+i] = new SmellyCritter();
		}

		for(int i=0; i<foo; i++) {
			critters[(foo*2)+i] = new UglyCritter();
		}
	}

	public void gogo(int days) {
		for (int i=0; i<days; i++) {
			System.out.println("\n***DAY " + (i+1) + "***\n");
			for (Critter critter: critters) {
				critter.passDay();
				System.out.println(critter);
			}
		}
	}

}

SmellyCritter.java

public class SmellyCritter extends Critter {

	public SmellyCritter() {
		super();
	}

	public void passDay() {
		changeAge(showAge() + 1);

		dance();

		super.action("Eat", 40, 6, 10);
		super.action("Sleep", 80, 2, 1);
	}

	public String displayType() {
		return "Smelly";
	}

	private void dance() {
		if (showAge() > 15) {
			changeHealth(showHealth() + 1);
		}
	}


}

UglyCritter.java

public class UglyCritter extends Critter {

	public UglyCritter() {
		super();
	}

	public void passDay() {
		changeAge(showAge() + 1);
		super.action("Eat", 70, 4, 15);
		super.action("Sleep", 50, 9, 2);
	}

	public String displayType() {
		return "Ugly";
	}

}