Implement a class Point that represents a point in the plane, with accessors that yield

• the x- and y-coordinates
• the radius and angle in polar coordinates

Points can be constructed in the following ways:

• With a no-argument constructor that constructs the origin (0, 0).
• With a constructor that takes the x- and y-component.
• With a constructor that takes an array of length 2 with the x- and y-coordinates.
• As a copy of another point.
• With factory methods of and ofPolar.

Look at the unit test for details.

Hint: The angle is Math.atan2(y, x).