Shape Hierarchy Lab (Starter)

Minimal starter: just enough to compile. Implement the classes so tests pass.

Run tests

./gradlew test     # macOS/Linux
gradlew.bat test   # Windows

Tasks

• Create a Shape interface with double getArea() (already provided).
• Complete Circle, Rectangle, Triangle so that:
  • Constructors accept dimensions.
  • getArea() returns the correct area.
• In ShapeHierarchy.main, create a few shapes and print their areas.
• Edge cases: Treat negative dimensions as 0 for this lab.

Hints: Use encapsulation (private fields) and keep logic in methods.