Programming Exercise $04$

$1.$ Shape Hierarchy:

$-$ Create a base class called $$Shape$$ with the following attributes and methods:

$-$ Attributes: $`$color$`($String$)$ and $`$filled$`($boolean$).$

$-$ Methods:

$-`$getArea$()`($abstract method$)$

$-`$getPerimeter$()`($abstract method$)$

$-`$toString$()`$ method that returns a string representation of the shape.

$-$ Create two subclasses, $`$Circle$`$ and $`$Rectangle$`,$ that are inherited from the $`$Shape$`$ class.

$-`$Circle$`$ should have a $`$radius$`$ attribute.

$-`$Rectangle$`$ should have $`$width$`$ and $`$length$`$ attributes.

$-$ Implement appropriate constructors and override the abstract methods in the subclasses.

$2.$ Polymorphic Array:

$-$ In the main class, create an array of $`$Shape$`$ objects.

$-$ Populate the array with instances of $`$Circle$`$ and $`$Rectangle$`.$

$-$ Display the details $($color$,$ filled, area, and perimeter$)$ of each shape using polymorphism.

$3.$ Interface:

$-$ Define an interface called $`$Resizable$`$ with a method $`$resize$($double factor$)`$ that represents resizing a shape.

$-$ Make the $`$Rectangle$`$ class implement the $`$Resizable$`$ interface.

$-$ In the main class, demonstrate polymorphism by resizing a $`$Rectangle$`$ object using the $`$Resizable$`$ interface.

An example of the program is shown below: