Simple Geometry Application (Abstract Classes)

A small Java app demonstrating abstract classes, inheritance, and method overriding using geometric shapes.

Design

• Shape (abstract): enforces calculateArea() and calculatePerimeter(), and provides a concrete getName() + toString().
• Circle, Rectangle, Triangle: implement the abstract methods with appropriate formulas.
  • Input validation:
    • Circle: radius > 0
    • Rectangle: length, width > 0
    • Triangle: all sides > 0 and satisfy the triangle inequality
• Main: creates sample shapes, prints name/area/perimeter, and shows edge cases.

Files

• Shape.java
• Circle.java
• Rectangle.java
• Triangle.java
• Main.java

Build & Run

javac Shape.java Circle.java Rectangle.java Triangle.java Main.java
java Main