example of PointDistance class for "KClosestPoints" problem

PointDistance.java

class PointDistance implements Comparable<PointDistance> {
	Point p;
	double dist;
	
	public PointDistance(Point p, double dist) {
		this.p = p;
		this.dist = dist;
	}
	
	public int compareTo(PointDistance other) {
		return (int) (this.dist - other.dist);
	}
	
	// I could fix the toString to display a comma.
	// Easy fencepost stuff.
	// I will leave it as an exercise to the reader.
	public String toString() {
		return "(" + (int) p.getX() + ", " + (int) p.getY() + ") ";
	}
}