java instance methods creations

Question

public Point2D copyOf()

This method creates and returns a new, distinct Point2D object with data copied from this Point2D object.

public Point2D add(Point2D other)

This method creates and returns a new, distinct Point2D object that is the sum of this Point2D object and the Point2D object referenced by other. For example, the sum of points (1, 2) and (3, 4) is a new point (4, 6).



public Point2D midpoint(Point2D other)

This method creates and returns a new, distinct Point2D object that is the midpoint of the line segment formed by this Point2D object and the Point2D object referenced by other. For example, the midpoint of points (1, 2) and (3, 4) is a new point (2, 3). This method assumes that both the x and y coordinates of the midpoint are integers.

NOTE: Do not make copies of the objects used in instance methods unnecessarily. While the add and midpoint method should change neither this Point2D object nor the Point2D object referenced by other, the operations required to create the new Point2D object with the appropriate data naturally do not modify them.

Answer 1

I am writing a rough sketch of your code output as I don't know the full extent of the assignment, but I hope this helps!

public Point2D copyOf()

{

Point2D newPoint = new Point2D(0,0);

return newPoint;

}

public Point2D add(Point2D other)

{

new_x = x + other.x;

new_y = y + other.y;

Point2D final = new Point2D(other_x,other_y);

return final;

}

public Point2D midpoint(Point2D other)

{

new_x2 = (x + other.x)/2;

new_y2 =(y + other.y)/2;

Point2D final2 = new Point2D(other_x,other_y);

return final2;

}