/*
  Author:  James Tam
  Version: March 4, 2021

  Learning objective: 
  * How abstract classes can serve as a design template to specify actual 
    behavior that needs to be implemented by non-abstract child classes
    (via abstract methods such as 'workout').
  * How behavior that is common to all instances of a class and its child
    classes can be implemented as a default (non abstract methods such as 
    'rest').
  * Retrieving the name of a class at runtime.
*/


public abstract class TheoreticalPerson implements DesignPerson
{
    private int energy;

    public TheoreticalPerson()
    {
        changeEnergy(DEFAULT_ENERGY);
    }

    public TheoreticalPerson(int energy)
    {
        changeEnergy(energy);
    }

    public void rest()
    {
        energy = energy + DEFAULT_ENERGY;
    }

    public void changeEnergy(int amount)
    {
        energy = energy + amount;
    }

    public String toString()
    {
        //Object.getClass(): class type of object at runtime.
        String s = "Class type " + getClass() + " energy=" + energy;
        return(s);
    }

    public abstract void workout();

}