public class Person  implements Comparable, RPIPerson {

    public String mName;
    public int mIDNum;

    public Person(String name, int id){
	mName = name;
	mIDNum = id;
    }

    public String toString(){
	return mName + ", " + mIDNum;
    }

    public int compareTo(Object rhs){
	if (rhs instanceof Person)
	    return this.getIDNumber() - ((Person)rhs).getIDNumber();
	else
	    return -1;
    }

    public int getIDNumber() {
	return mIDNum;
    }
}