diff --git a/src/main/java/core/basesyntax/Bulldozer.java b/src/main/java/core/basesyntax/Bulldozer.java
new file mode 100644
index 000000000..ecb954c59
--- /dev/null
+++ b/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 working");
+    }
+
+    @Override
+    public void stopWork() {
+        System.out.println("Bulldozer stopped working");
+    }
+}
diff --git a/src/main/java/core/basesyntax/Excavator.java b/src/main/java/core/basesyntax/Excavator.java
new file mode 100644
index 000000000..8640ffcc1
--- /dev/null
+++ b/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 working");
+    }
+
+    @Override
+    public void stopWork() {
+        System.out.println("Excavator stopped working");
+    }
+}
diff --git a/src/main/java/core/basesyntax/Machine.java b/src/main/java/core/basesyntax/Machine.java
new file mode 100644
index 000000000..a69d35319
--- /dev/null
+++ b/src/main/java/core/basesyntax/Machine.java
@@ -0,0 +1,9 @@
+package core.basesyntax;
+
+public abstract class Machine {
+
+    public abstract void doWork();
+
+    public abstract void stopWork();
+}
+
diff --git a/src/main/java/core/basesyntax/MainApp.java b/src/main/java/core/basesyntax/MainApp.java
index f99e9a019..b6e7d0a78 100644
--- a/src/main/java/core/basesyntax/MainApp.java
+++ b/src/main/java/core/basesyntax/MainApp.java
@@ -1,5 +1,11 @@
 package core.basesyntax;
 
 public class MainApp {
-
+    public static void main(String[] args) {
+        Machine[] array = new Machine[]{new Truck(), new Bulldozer(), new Excavator()};
+        for (int i = 0; i < array.length; i++) {
+            array[i].doWork();
+            array[i].stopWork();
+        }
+    }
 }
diff --git a/src/main/java/core/basesyntax/Truck.java b/src/main/java/core/basesyntax/Truck.java
new file mode 100644
index 000000000..369460ca5
--- /dev/null
+++ b/src/main/java/core/basesyntax/Truck.java
@@ -0,0 +1,15 @@
+package core.basesyntax;
+
+public class Truck extends Machine {
+
+    @Override
+    public void doWork() {
+        System.out.println("Truck started working");
+    }
+
+    @Override
+    public void stopWork() {
+        System.out.println("Truck stopped working");
+    }
+}
+