diff --git a/src/main/java/core/basesyntax/Bulldozer.java b/src/main/java/core/basesyntax/Bulldozer.java
new file mode 100644
index 000000000..0645ff181
--- /dev/null
+++ b/src/main/java/core/basesyntax/Bulldozer.java
@@ -0,0 +1,11 @@
+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");
+    }
+}
\ No newline at end of file
diff --git a/src/main/java/core/basesyntax/Excavator.java b/src/main/java/core/basesyntax/Excavator.java
new file mode 100644
index 000000000..5e730d43b
--- /dev/null
+++ b/src/main/java/core/basesyntax/Excavator.java
@@ -0,0 +1,11 @@
+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");
+    }
+}
\ No newline at end of file
diff --git a/src/main/java/core/basesyntax/Machine.java b/src/main/java/core/basesyntax/Machine.java
new file mode 100644
index 000000000..28996c07a
--- /dev/null
+++ b/src/main/java/core/basesyntax/Machine.java
@@ -0,0 +1,5 @@
+package core.basesyntax;
+public abstract class Machine {
+    public abstract void doWork();
+    public abstract void stopWork();
+}
\ No newline at end of file
diff --git a/src/main/java/core/basesyntax/MainApp.java b/src/main/java/core/basesyntax/MainApp.java
index f99e9a019..f1dd58337 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) {
+        // All executable code goes inside this method
+        Machine[] machines = {new Truck(), new Bulldozer(), new Excavator()};
+        for (Machine machine : machines) {
+            machine.doWork();
+            machine.stopWork();
+        }
+    }
+}
\ No newline at end of file
diff --git a/src/main/java/core/basesyntax/Truck.java b/src/main/java/core/basesyntax/Truck.java
new file mode 100644
index 000000000..b1920543b
--- /dev/null
+++ b/src/main/java/core/basesyntax/Truck.java
@@ -0,0 +1,11 @@
+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");
+    }
+}
\ No newline at end of file