Added new classes Machine, Truck, Bulldozer, Excavator and created and overrided methods doWork() and stopWork() #2464
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…d overrided methods doWork() and stopWork()
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Review Summary
Your solution is approved. You implemented the abstract Machine with the exact required signatures (public abstract void doWork() and public abstract void stopWork()), and each concrete class (Truck, Bulldozer, Excavator) correctly overrides both methods with clear English messages identifying the machine type. MainApp properly demonstrates polymorphism by storing different machines in a Machine[] and invoking doWork() and stopWork() in a loop, and all classes/methods have appropriate access modifiers for a runnable program.
Minor improvement (optional): consider standardizing the wording of the printed messages across all machines for consistency (e.g., use “started working”/“stopped working” uniformly). Great job meeting the core requirements and keeping the implementation clean and straightforward!
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