Solution by mykhalenych · Pull Request #2595 · mate-academy/jv-oop

mykhalenych · 2026-05-20T10:21:29Z

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mateacademy-ai-mentor

Review Summary

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mateacademy-ai-mentor · 2026-05-20T10:23:08Z

@@ -0,0 +1,11 @@
+package core.basesyntax;
+


The checklist explicitly states to avoid redundant empty lines after class declaration. Remove this empty line.

mateacademy-ai-mentor · 2026-05-20T10:23:08Z

+public class Excavator extends Machine {
+    public void doWork() {
+        System.out.println("Excavator started its work");
+    }


The checklist explicitly states to avoid redundant empty lines after method signature. Remove this empty line.

mateacademy-ai-mentor · 2026-05-20T10:23:08Z

@@ -0,0 +1,11 @@
+package core.basesyntax;
+


The checklist explicitly states to avoid redundant empty lines after class declaration. Remove this empty line.

mateacademy-ai-mentor · 2026-05-20T10:23:08Z

+public class Excavator extends Machine {
+    public void doWork() {
+        System.out.println("Excavator started its work");
+    }


The checklist explicitly states to avoid redundant empty lines after method signature. Remove this empty line.

mateacademy-ai-mentor · 2026-05-20T10:23:08Z

@@ -0,0 +1,11 @@
+package core.basesyntax;
+


The checklist explicitly states to avoid redundant empty lines after class declaration. Remove this empty line.

mateacademy-ai-mentor · 2026-05-20T10:23:08Z

+
+public class Excavator extends Machine {
+    public void doWork() {
+        System.out.println("Excavator started its work");


The checklist explicitly states to avoid redundant empty lines after method signature. Remove this empty line.

mateacademy-ai-mentor · 2026-05-20T10:23:08Z

+        System.out.println("Excavator started its work");
+    }
+
+    public void stopWork() {


The checklist explicitly states to avoid redundant empty lines after class declaration. Remove this empty line.

mateacademy-ai-mentor · 2026-05-20T10:23:08Z

+
+public abstract class Machine {
+    public abstract void doWork();
+


The task requires creating a Machine array containing all three machine instances. Currently, separate variables are created instead of an array.

mateacademy-ai-mentor · 2026-05-20T10:23:08Z

+    public abstract void stopWork();
+}


Redundant empty line after method declaration - this follows the 'Bad example' pattern from the checklist.

mateacademy-ai-mentor · 2026-05-20T10:23:08Z

+    public abstract void stopWork();
+}


Redundant empty line after method declaration - this follows the 'Bad example' pattern from the checklist.

mateacademy-ai-mentor · 2026-05-20T10:23:13Z

+    public abstract void doWork();
+


Redundant empty line after method signature - this follows the 'Bad example' pattern from the checklist.

mateacademy-ai-mentor · 2026-05-20T10:23:13Z

@@ -0,0 +1,11 @@
+package core.basesyntax;
+


Checklist violation: redundant empty line after class declaration. Remove the empty line on line 2.

mateacademy-ai-mentor · 2026-05-20T10:23:13Z

+public class Bulldozer extends Machine {
+    public void doWork() {
+        System.out.println("Bulldozer started its work");
+    }


Checklist violation: redundant empty line after method closing brace.

mateacademy-ai-mentor · 2026-05-20T10:23:13Z

@@ -0,0 +1,11 @@
+package core.basesyntax;
+


Checklist violation: redundant empty line after class declaration. Remove the empty line on line 2.

mateacademy-ai-mentor · 2026-05-20T10:23:13Z

+public class Bulldozer extends Machine {
+    public void doWork() {
+        System.out.println("Bulldozer started its work");
+    }


Checklist violation: redundant empty line after method closing brace.

mateacademy-ai-mentor · 2026-05-20T10:23:14Z

@@ -0,0 +1,11 @@
+package core.basesyntax;
+


Checklist violation: redundant empty line after class declaration.

mateacademy-ai-mentor · 2026-05-20T10:23:14Z

+package core.basesyntax;
+
+public class Bulldozer extends Machine {
+    public void doWork() {


Checklist violation: redundant empty line after method signature.

mateacademy-ai-mentor · 2026-05-20T10:23:14Z

@@ -0,0 +1,11 @@
+package core.basesyntax;
+


Checklist violation: redundant empty line after class declaration.

mateacademy-ai-mentor · 2026-05-20T10:23:14Z

+    public static void main(String[] args) {
+        Machine truc = new Truck();
+        truc.doWork();
+        truc.stopWork();

+        Machine bulldozer = new Bulldozer();
+        bulldozer.doWork();
+        bulldozer.stopWork();
+
+        Machine excavator = new Excavator();
+        excavator.doWork();
+        excavator.stopWork();


The description requires creating a 'Machine array' and calling methods 'in a loop'. Currently, three separate variables are used instead of an array, and there is no loop. This doesn't demonstrate polymorphism as intended.

mateacademy-ai-mentor · 2026-05-20T10:23:14Z

@@ -0,0 +1,11 @@
+package core.basesyntax;
+


Checklist violation: redundant empty line after class declaration. Remove this empty line as per the 'Bad example' pattern in the checklist.

mateacademy-ai-mentor · 2026-05-20T10:23:18Z

+public class Truck extends Machine {
+    public void doWork() {
+        System.out.println("Truck started its work");
+    }


Checklist violation: redundant empty line after method declaration. Remove this empty line as per the checklist guidelines.

added solution

d18ef05

mateacademy-ai-mentor approved these changes May 20, 2026

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mateacademy-ai-mentor reviewed May 20, 2026

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

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mykhalenych commented May 20, 2026

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