/** A class to represent a Cat.
 */
public class Cat {
  // Field names duplicated in every type of animal.
  String name;
  String sound;
  
  // A field specific to cats, not shared by all Animals:
  double clawSharpness;  // 0.0 represents dull; 1.0 is razor-sharp.

  /** Constructor
   * @param _name, the cat's name.
   */
  Cat( String _name ) {
    this.name = _name;
    this.sound = "meow";
    
    // But this line okay -- it is specific to cats:
    this.clawSharpness = 0.9;  // Kittens start out with sharp claws.
    }

    
  /** When the animal wants to bug a human, it says...
   * @return The sound of the animal, bugging its owner.
   */
  public String speak() {
    return this.sound + ", " + this.sound + ".";
    }
    

  // A method specific to cats, not shared by all Animals:
  /** What happens, when a cat pounces.
   * @return The sound of this cat pouncing.
   */
  String pounce() {
    // Every time they pounce, the claws get 10% closer to perfect sharpness:
    this.clawSharpness += 0.1*(1.0-this.clawSharpness);
    return "whoooomf";
    }
  }