Add the following mutator method to the Point class:
public void flip ( )
Negates and swaps the x/y coordinates of the Point object. For example, if an object pt initially represents the point (5, −3), after a call of pt.flip ( ); the object should represent (3, −5). If the same object initially represents the point (4, 17), after a call to pt.flip ( ); the object should represent (−17, −4).
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