// ordinary class inheriting from specification of generic class
public class Coordinate extends MyPair<Integer, Integer> {

	// constructor
	public Coordinate() {
		super(0, 0, "");
	}

	// constructor
	public Coordinate(int v1, int v2) {
		super(v1, v2);
	}

	// return distance between points
	public double distance(Coordinate other) {
		return Math.sqrt( 
		(getFirst() - other.getFirst()) * (getFirst() - other.getFirst()) +
		(getSecond() - other.getSecond()) * (getSecond() - other.getSecond()));
	}

	// string is the pair in parens
	public String toString() {
		return "("+getFirst()+", "+getSecond()+")";
	}
}