SwapPointRef.java

public class SwapPointRef {
	
	public static void swap(Point a, Point b) {
		
		int temp = a.getX();
		a.setX(b.getX());
		b.setX(temp);
	}
	
	public static void main(String[] argv) {

		Point c = new Point(1);
		Point d = new Point(2);

		System.out.println("c: " + c);
		System.out.println("d: " + d);

		swap(c, d);

		System.out.println("c: " + c);
		System.out.println("d: " + d);
	}
}