public class Shark extends Fish {
 
    private int energy;
    
    public Shark(int pos, int startingEnergy) {
        super(pos); // call Fish constructor
        this.energy = startingEnergy;
    }
    
    public void eat() {
        System.out.println("The shark eats!");
        energy += 10;
    }
    
    public int getEnergy() {
        return energy;
    }
    
    // this implementation replaces the swim implementation from Fish
    @Override
    public void swim() {
        System.out.println("The shark stalks its prey!");
    }
    
    // replaces the toString implementation from Object
    @Override
    public String toString() {
        return "[this is a shark]";
    }
    
}