diff --git a/MainApp.java b/MainApp.java
new file mode 100644
index 000000000..95e0f70ee
--- /dev/null
+++ b/MainApp.java
@@ -0,0 +1,17 @@
+package core.basesyntax;
+
+public class MainApp {
+    
+    public static void main(String[] args) {
+    Machine[] machines = {
+            new Truck(),
+            new Bulldozer(),
+            new Excavator()
+        };
+        for (Machine machine : machines) {
+            machine.doWork();   
+            machine.stopWork(); 
+            System.out.println("--------------------"); 
+        }
+    }
+}
diff --git a/MainApp1.java b/MainApp1.java
new file mode 100644
index 000000000..95e0f70ee
--- /dev/null
+++ b/MainApp1.java
@@ -0,0 +1,17 @@
+package core.basesyntax;
+
+public class MainApp {
+    
+    public static void main(String[] args) {
+    Machine[] machines = {
+            new Truck(),
+            new Bulldozer(),
+            new Excavator()
+        };
+        for (Machine machine : machines) {
+            machine.doWork();   
+            machine.stopWork(); 
+            System.out.println("--------------------"); 
+        }
+    }
+}
diff --git a/public abstract class Machine {.java b/public abstract class Machine {.java
new file mode 100644
index 000000000..f377fe04b
--- /dev/null
+++ b/public abstract class Machine {.java	
@@ -0,0 +1,6 @@
+package core.basesyntax;
+
+public abstract class Machine {
+     public abstract void doWork();
+     public abstract void stopWork();
+}
\ No newline at end of file
diff --git a/public class Bulldozer extends Machine {.java b/public class Bulldozer extends Machine {.java
new file mode 100644
index 000000000..bf19cb4a6
--- /dev/null
+++ b/public class Bulldozer extends Machine {.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.");
+    }
+}
\ No newline at end of file
diff --git a/public class Excavator extends Machine {.java b/public class Excavator extends Machine {.java
new file mode 100644
index 000000000..4a411ee9e
--- /dev/null
+++ b/public class Excavator extends Machine {.java	
@@ -0,0 +1,14 @@
+package core.basesyntax;
+
+public 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.");
+    }
+}
\ No newline at end of file
diff --git a/public class Truck extends Machine {.java b/public class Truck extends Machine {.java
new file mode 100644
index 000000000..4d1f69912
--- /dev/null
+++ b/public class Truck extends Machine {.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.");
+    }
+}
\ No newline at end of file