abstract public class Prisoner {
    protected int ID;
	
    /**
     * @param ID the unique integer ID of this prisoner
     * @requires ID is unique amongst instances of (derived) class <br />
     *           prisoner ID's are consecutively assigned 0..99
     */
    public Prisoner (int ID)	{
	this.ID = ID;
    }
	
    /**
     * @return a one-line high-level description of the strategy
     */
    abstract public String strategyDescription ();

	
    /**
     * @param day   the count of day in which visit occurs (numbered from 0)
     * @param light the shared light bulb object which can be observed and
     * 		    modified during the visit
     * @return true iff the prisoner is willing to claim that all prisoners
     * 	       have visited the common room
     */
    abstract public boolean visit (int day, LightBulb light);
}