Done homework

pom.xml

@@ -47,6 +47,15 @@
                     <linkXRef>false</linkXRef>
                 </configuration>
             </plugin>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-compiler-plugin</artifactId>
+                <configuration>
+                    <source>25</source>
+                    <target>25</target>
+                    <compilerArgs>--enable-preview</compilerArgs>
+                </configuration>
+            </plugin>
         </plugins>
         <pluginManagement>
             <plugins>

src/main/java/core/basesyntax/Bulldozer.java

@@ -0,0 +1,14 @@
+package core.basesyntax;
+
+public class Bulldozer extends Machine {
+
+    @Override
+    public void doWork() {
+        System.out.println("Bulldozer started work");
+    }
+
+    @Override
+    public void stopWork() {
+        System.out.println("Bulldozer stopped work");
+    }
+}

src/main/java/core/basesyntax/Excavator.java

@@ -0,0 +1,14 @@
+package core.basesyntax;
+
+public class Excavator extends Machine {
+
+    @Override
+    public void doWork() {
+        System.out.println("Excavator started work");
+    }
+
+    @Override
+    public void stopWork() {
+        System.out.println("Excavator stopped work");
+    }
+}

src/main/java/core/basesyntax/Machine.java

@@ -0,0 +1,8 @@
+package core.basesyntax;
+
+public abstract class Machine {
+
+    public abstract void doWork();
+
+    public abstract void stopWork();
+}

src/main/java/core/basesyntax/MainApp.java

@@ -1,5 +1,22 @@
 package core.basesyntax;
 
 public class MainApp {
+    public static void main(String[] args) {
+        Machine[] machines = new Machine[7];
+
+        machines[0] = new Truck();
+        machines[1] = new Bulldozer();
+        machines[2] = new Excavator();
+        machines[3] = new Excavator();
+        machines[4] = new Truck();
+        machines[5] = new Bulldozer();
+        machines[6] = new Truck();
+
+        for (int i = 0; i < machines.length; i++) {
+            machines[i].doWork();
+            machines[i].stopWork();
+        }
+
+    }
 
 }

src/main/java/core/basesyntax/Truck.java

@@ -0,0 +1,14 @@
+package core.basesyntax;
+
+public class Truck extends Machine {
+
+    @Override
+    public void doWork() {
+        System.out.println("Truck started work");
+    }
+
+    @Override
+    public void stopWork() {
+        System.out.println("Truck stopped work");
+    }
+}