created abstract class Machine, classes Truck, Excavator, Bulldozer heirs of the Machine class. Added test code from MainApp.#2525
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…eirs of the Machine class. Added test code from MainApp.
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Jan 31, 2026
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Review Summary
Excellent work on this task! You've successfully demonstrated a strong understanding of core OOP principles, including abstraction, inheritance, and polymorphism. All classes (Machine, Truck, Bulldozer, Excavator) are implemented correctly, and the MainApp effectively uses polymorphism to manage the different machine types. Your code is clean, well-structured, and meets all the requirements. I am happy to approve your solution. Keep up the great work!
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created abstract class Machine, classes Truck, Excavator, Bulldozer heirs of the Machine class. Added test code from MainApp.