public class Rectangle

$\{$

private final double x; $//($x$,$y$)$ is the upper left$-$hand corner of this rectangle

private final double y;

private final double width;

private final double height;

$/**$

@param x x$-$coordinate of this Rectangle's upper left$-$hand corner

@param y y$-$coordinate of this Rectangle's upper left$-$hand corner

@param width width of this Rectangle, must be strictly positive

@param height height of this Rectangle, must be strictly positive

@throws IllegalArgumentException when width is not strictly positive

@throws IllegalArgumentException when height is not strictly positive

$*/$

public Rectangle$($double x$,$ double y$,$ double width, double height$)$

$\{$

$//$ implementation

$\}$

$/**$

@return the x$-$coordinate of this Rectangle's upper left$-$hand corner

$*/$

public double getX$()$

$\{$

$//$ implementation

$\}$

$/**$

@return the y$-$coordinate of this Rectangle's upper left$-$hand corner

$*/$

public double getY$()$

$\{$

$//$ implementation

$\}$

$/**$

@return the value of this Rectangle's width

$*/$

public double getWidth$()$

$\{$

$//$ implementation

$\}$

$/**$

@return the value of this Rectangle's height

$*/$

public double getHeight$()$

$\{$

$//$ implementation

$\}$

$/**$

@return the value of this Rectangle's area

$*/$

public double getArea$()$

$\{$

$//$ implementation

$\}$

$/**$

@return the value of this Rectangle's perimeter

$*/$

public double getPerimeter$()$

$\{$

$//$ implementation

$\}$

$/**$

Return a Rectangle object that has the same upper left$-$hand

corner and height as this Rectangle but with the given width.

@param width the width for the new rectangle

@return a Rectangle with the given width and the same upper left$-$hand corner and height as this rectangle

$*/$

public Rectangle setWidth$($double width$)$

$\{$

$//$ implementation

$\}$

$/**$

Return a Rectangle object that has the same upper left$-$hand

corner and width as this Rectangle but with the given height.

@param height the height for the new rectangle

@return a Rectangle with the given height and the same upper left$-$hand corner and width as this rectangle

$*/$

public Rectangle setHeight$($double height$)$

$\{$

$//$ implementation

$\}$

$/**$

Return a Rectangle object that has the same width and height

as this Rectangle but the new Rectangle should have its upper

left$-$hand corner at the given x and y values.

@param x x$-$coordinate for the new Rectangle's upper left$-$hand corner

@param y y$-$coordinate for the new Rectangle's upper left$-$hand corner

@return a Rectangle with the same dimensions but a different upper left$-$hand corner

$*/$

public Rectangle moveTo$($double x$,$ double y$)$

$\{$

$//$ implementation

$\}$

$/**$

Return a Rectangle object that has the same width and height

as this Rectangle but the new Rectangle should have its upper

left$-$hand corner translated from where this Rectangle's upper

left$-$hand corner is$.$

@param dx amount by which to change the x$-$coordinate from this Rectangle

@param dy amount by which to change the y$-$coordinate from this Rectangle

@return a Rectangle with the same dimensions but a different upper left$-$hand corner

$*/$

public Rectangle translateBy$($double dx$,$ double dy$)$

$\{$

$//$ implementation

$\}$

$/**$

Return a Rectangle object that has the same upper left$-$hand

corner as this Rectangle, but the new Rectangle should have

the width and height from this Rectangle flipped.

@return a Rectangle with the same upper left$-$hand corner but with the dimensions flipped

$*/$

public Rectangle flip$()$

$\{$

$//$ implementation

$\}$

$/**$

Return a Rectangle object with the same upper left$-$hand

corner as this Rectangle, a width that is the maximum

of the widths from the two input Rectangles, and with

a height that is the maximum of the heights from the

two input Rectangles.

@param r$1$ the first input Rectangle

@param r$2$ the second input Rectangle

@return a Rectangle with the same upper left$-$hand corner as this one, and maximal dimensions

$*/$

public Rectangle maximal$($Rectangle r$1,$ Rectangle r$2)$

$\{$

$//$ implementation

$\}$

public String toString$()$

$\{$

return "Rectangle$[$x$="+$x$+",$ y$="+$y$+",$ width$="+$width$+",$ height$="+$height$+"]"$;

$\}$

$\}$