package Classes;

public class Dog {
    public String name;
    public int sticksFetched;
    public Dog myFriend;
    public Cat enemy;
    
    // behavior method
    public void fetch() {
        // methods can access instance variables
        sticksFetched++;
    }
    
    public void bark(){
        // methods can access instance variables
        System.out.println(name + " says woof");
    }

    public void chaseCat(){
        // methods can access instance variables
        // if instance variables have their own instance variables
        // we can access those too
        System.out.println(name + " chases " + enemy.catname);
    }

    
    public void loseSticks() {
        // local variable, only exists in this method
        int old = sticksFetched;
        sticksFetched /= 2;
        System.out.println(name + " had  " + old + " sticks but now only has " + sticksFetched);
    }
    
    public void gainSticks() {
        // local variable, happens to have same name as other local variable
        int old = sticksFetched;
        sticksFetched *= 2;
        System.out.println(name + " had  " + old + " sticks but now  has " + sticksFetched);
    }
    
    public String toString() {
        // simple version that ignores friend and enemy
        return "a dog called " + name + " with " + sticksFetched + " sticks";
        
        // fancier version that includes friend and enemy
        // but if two dogs are each others friend, this goes on forever
        /*
        return "a dog called " + name + " with " + sticksFetched + " sticks"
                +" whose friend is " + myFriend 
                +" and whose enemy is " + enemy;
        */
        // this version doesn't blow up for mutual friend dogs
        // but does blow up if dog doesn't have friend and enemy
        /*
        return "a dog called " + name + " with " + sticksFetched + " sticks"
                +" whose friend is " + myFriend.name 
                +" and whose enemy is " + enemy.catname;
         */
        // we need conditionals so we can have a fancier version without blowing up!
    }
}