add Truck.java, Bulldozer.java, Excavator.java, Machine.java and real…

[MrRaveGit]

…ise MainApp.java method

[mateacademy-ai-mentor]

Review Summary

Excellent work on this task! Your implementation correctly demonstrates the principles of inheritance and polymorphism, and all functional requirements are met. I am approving your solution.

One small point for future consideration is the access modifier on the Excavator class. It has default (package-private) access, while the other Machine subclasses are public. For consistency and to ensure classes are accessible from other packages in larger applications, it's a good practice to declare them as public.

Keep up the great work!

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[mateacademy-ai-mentor]

This class has default (package-private) access, while the Truck and Bulldozer classes are public. For consistency and to make it clearly accessible from other packages in a larger application, consider declaring this class as public.