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Class sg.Square 

java.lang.Object
   |
   +----sg.Quadrilateral
           |
           +----sg.Trapezoid
                   |
                   +----sg.Parallelogram
                           |
                           +----sg.Rectangle
                                   |
                                   +----sg.Square
public class Square
extends Rectangle
Creates a square object.

Constructor Index

o Square(Pixel, Pixel, Pixel, Pixel)
Four parameter constructor insures that new object is a square.

Constructors

o Square 
 public Square(Pixel pt1,
               Pixel pt2,
               Pixel pt3,
               Pixel pt4)
Four parameter constructor insures that new object is a square. If not, throws IllegalArgumentException. 

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