Shape Calculator

A Java application that calculates area and perimeter for multiple shape types, then visualizes the selected shape with JavaFX.

The program asks the user for a number of sides, builds the correct shape object, collects the required measurements, prints the result, and opens a visual representation when JavaFX is available.

Features

• Supports circles, triangles, rectangles, pentagons, and generic polygons
• Uses a shared Shape abstraction for common behavior
• Uses Polygon as a base class for polygon-based shapes
• Calculates area and perimeter for each supported shape
• Validates triangle side lengths and angle totals
• Uses JavaFX to draw the selected shape

Concepts Practiced

• Java
• Object-oriented programming
• Abstract classes
• Inheritance
• Polymorphism
• Method overriding
• Switch expressions
• JavaFX graphics

How to Run

Compile the Java files:

javac *.java

Run the main program:

java Main

JavaFX must be configured in your IDE or runtime environment for the visualizer window to display correctly.

What I Learned

This project helped me understand how class hierarchies can model real-world categories. A circle, triangle, rectangle, and polygon all share shape behavior, but each one calculates its measurements differently.