A Java Class in java pgm

A Java Class

class Point

{

      public double x, y;

      public static Point origin = new Point(0,0);

      Point(double x_value, double y_value)

 {

        x = x_value;

        y = y_value;

   }

        public void clear()

{

        this.x = 0;

        this.y = 0;

   }

        public double distance(Point that)

 {

        double xDiff = x - that.x;

        double yDiff = y - that.y;

        return Math.sqrt(xDiff * xDiff + yDiff * yDiff);

   }

}