Task completed

[Eugen2510]

Implement abstract Machine class and subclasses (Truck, Bulldozer, Excavator) with doWork() and stopWork() methods

[mateacademy-ai-mentor]

Review Summary

The submission is missing the MainApp.java file, which is a critical requirement — the task explicitly asks for a MainApp class that creates a Machine array containing Truck, Bulldozer, and Excavator instances and calls doWork() and stopWork() in a loop. Without this file, the core demonstration of polymorphism using abstract references cannot be verified or executed. Additionally, the linter reports WhitespaceAround violations in MainApp.java (lines 4 and 11) and Truck.java (line 3), but those are secondary — the absence of MainApp.java itself is the primary blocker. Please add MainApp.java implementing the required logic, ensuring you use abstract references like Machine truck = new Truck(); [CHECKLIST ITEM #3], and fix the whitespace issues to pass linting. Your implementations of Machine, Truck, Bulldozer, and Excavator are correct and well-structured — just complete the missing piece!

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[mateacademy-ai-mentor]

Review Summary

Changes are needed because the required abstract base class Machine.java is missing from the submission. This is a critical blocker — all subclasses (Truck, Bulldozer, Excavator) extend Machine, and MainApp uses Machine references, but without the Machine class definition containing the abstract methods doWork() and stopWork(), the code will not compile. You must add src/main/java/core/basesyntax/Machine.java with:

package core.basesyntax;

public abstract class Machine {
    public abstract void doWork();
    public abstract void stopWork();
}

This satisfies the core requirement to "create abstract class Machine with doWork() and stopWork() methods" [CHECKLIST ITEM #1]. Once added, the polymorphic behavior in MainApp will work as intended.

---

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Important

Fix the issues, commit the changes, and then re-request my review using the Re-request review button² in the Reviewers tab.

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Caution

Do not close the pull request until the review is complete. Closing it early can lead to unexpected behavior and disrupt the review process.

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[mateacademy-ai-mentor]

The required Machine abstract class is missing from the submission. This class must contain the abstract method signatures public abstract void doWork() and public abstract void stopWork() that all machine types will override.

[fetis-off]

Good one! Approved