A$.$ Design a class named Triangle that extends

GeometricObject and implements Comparable and

Clonable. The class contains:

$$ Three double data fields named side$1,$ side$2,$ and side$3$

with default values $1\mathrm{.}0$ to denote three sides of the

triangle.

$$ A no$-$arg constructor that creates a default triangle.

$$ A constructor that creates a triangle with the

specified side$1,$ side$2,$ and side$3.$

$$ The accessor methods for all three data fields.

$$ A method named getArea$()$ that returns the area of this

triangle. Here$$s the code to calculate the area:

s $=($side$1+$ side$2+$ side$3)/2$;

area $=$ Math.sqrt$($s $*($s $-$ side$1)*($s $-$ side$2)*($s $-$ side$3))$;

$$ A method named getPerimeter$()$ that returns the

perimeter of this triangle.

$$ A method named compareTo$()$ that compares the area of

itself and another triangle, return $-1,1$ or $0.$ Hint:

Look at Rectangle example.

$$ A method named clone$()$ that create another triangle

having the same dimensions.

$$ A method named toString$()$ that returns a string

description for the triangle. The toString$()$ method is

implemented as follows:

return "Triangle: side$1="+$ side$1+"$ side$2="+$ side$2+$

$"$ side$3="+$ side;