$1.$ Declare the headers$($class declaration$)$ for the classes in the class diagram.

$2.$ Declare no$-$argument constructors for Shape, TwoDimensionalShape, and

ThreeDimensionalShape classes.

$3.$ Declare the instance variables for Circle$($radius$),$ Square$($side$),$ Sphere$($radius$)$ and

Cube$($side$)$ classes. $4.$ Declare one$-$argument and no$-$argument constructors for Circle, Square, Sphere,

and Cube classes.

$5.$ Declare get and set methods for instance variables in Circle, Square, Sphere, and

Cube classes

$6.$ Declare computeArea method for Circle, Square, Sphere, and Cube classes.

$7.$ Declare toString methods for all the classes. Class Shape$$s toString method should

return the string $$Shape$.$ The toString method of each of the subclasses in the

hierarchy should return a string containing the class$$s name the string $$is a$$ and the

result of a call the superclass$$s toString method.

$8.$ Write a separate driver class$($application class$)$ that creates one object of each of

the classes Circle, Square Sphere and Cube, and invokes their toString methods.

The output for each object should show the is$-$a relationships between that object$$s

class and its superclasses.Sample Output:

Circle: Circle is a TwoDimesnionalShape is a Shape

Circle's area is $4\mathrm{.}91$

Square: Square is a TwoDimesnionalShape is a Shape

Square's area is $6\mathrm{.}25$

Sphere: Sphere is a ThreeDimesnionalShape is a Shape

Sphere's area is $176\mathrm{.}71$

Sphere's volume is $220\mathrm{.}89$

Cube: Cube is a ThreeDimesnionalShape is a Shape

Cube's area is $150\mathrm{.}00$

Cube's volume is $125\mathrm{.}00$