/** An instance is a zoo creature.  PAGE ONE OF CS1110 REVIEW SESSION, apparent/real classes etc. */
public class Creature {
    
    /** This Creature's name */
    private String name; 
    
    /** set of Creatures in the zoo*/
    // this field has been set to public to make this running example 
    //   shorter to present
    public static Creature[] zoo; 
  
    /** Constructor: a new Creature with name n */
    public Creature(String n) {
        setName(n);
    }
    
    /** = this Creature's name */
    public String getName() {
        return name;
    }
        
    
    /** Set this Creature's name to n */
    public void setName(String n) {
        name= n;
    }
    
    
}

/** An instance is a bird */
public class Bird extends Creature {
    
    /** set of Birds in the zoo.  
      * (Elements should also be listed in the zoo) */
    // public for the purposes of example
    public static Bird[] aviary;
    
    /** Constructor: a Bird with name n */
    public Bird(String n) {
     super(n);   
    }
    
    /** = "a Bird can (usually) fly" */
    public boolean canFly() {
        return true;
    }
}


/** An instance is a penguin */
public class Penguin extends Bird{
    
    /** Constructor: a new Penguin with name n*/
    public Penguin(String n) {
        super(n);   
    }
    
    /** = "a Penguin can usually fly" */
    public boolean canFly() {
        return false;
    }
    
    
    public static void demo() { // PAGE TWO OF CS1110 REVIEW SESSION #2 HANDOUT
        
        // (1) local variables
        Creature x;
        Bird y;
        Penguin z;
        
        // (2) Can you create a new Bird named Tweety and store its name in x?
        
        
        // (3) Can you store (the name of) the new Bird just created in y?
        
        
        // (4) Can you create a new Penguin named Opus and store (the name of) it in z?
        
        
        // (5) Can you execute this statement?
        // zoo[0]=x;
        
        
        // (6) Can you make zoo able to hold 3 elements, and aviary able to hold 2? 
        
        
        
        // (7) Can you execute this statement (now)?
        // zoo[0]=x;
        
        
        // (8) How many ways are there to store the object named in x in aviary[0] (IN THIS
        // PARTICULAR SETTING, WITH x, y, z AS SET ABOVE)?
        
        
        // (9) Can you store the object named in z in both zoo[1] and aviary[1]?
        
        
        
        // (10) What happens when we do this?
        // x.setName("daffy");
        // System.out.println("aviary[0] after x.setName(\"daffy\"): " + aviary[0].getName());
        
        // (11) What happens when we (try to) do each of these things?
        // (11a) 
        // System.out.println("can aviary[0] (codename " + aviary[0].getName() + ") fly? " + aviary[0].canFly()); 
 
        
        // (11b) 
        // System.out.println("can aviary[1] (codename " + aviary[1].getName() + ") fly? " + aviary[1].canFly());
        

        // (11c)
        // System.out.println("can zoo[0] (codename " + zoo[0].getName() + ") fly? " + zoo[0].canFly());
        

        // (11d)
        // System.out.println("can ((Bird) zoo)[0] (codename " + zoo[0].getName() + ") fly? " + ((Bird) zoo[0]).canFly());
    }
    
    
    
    
}