add Truck.java, Bulldozer.java, Excavator.java, Machine.java and real…

pom.xml

@@ -9,7 +9,7 @@
     <version>1.0-SNAPSHOT</version>
 
     <properties>
-        <jdk.version>17</jdk.version>
+        <jdk.version>11</jdk.version>
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
         <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
         <maven.checkstyle.plugin.version>3.1.1</maven.checkstyle.plugin.version>

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 its work.");
+    }
+
+    @Override
+    public void stopWork() {
+        System.out.println("Bulldozer stopped working.");
+    }
+}

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

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

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 +1,12 @@
 package core.basesyntax;
 
 public class MainApp {
+    public static void main(String[] args) {
+        Machine[] machines = new Machine[] { new Truck(), new Bulldozer(), new Excavator() };
 
+        for (Machine machine : machines) {
+            machine.doWork();
+            machine.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 its work.");
+    }
+
+    @Override
+    public void stopWork() {
+        System.out.println("Truck stopped working.");
+    }
+}