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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 start work");
+    }
+
+    @Override
+    public void stopWork() {
+        System.out.println("Bulldozer stop work");
+    }
+}
+

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

@@ -0,0 +1,15 @@
+package core.basesyntax;
+
+public class Excavator extends Machine {
+
+    @Override
+    public void doWork() {
+        System.out.println("Excavator start work");
+    }
+
+    @Override
+    public void stopWork() {
+        System.out.println("Excavator stop work");
+    }
+}
+

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

@@ -0,0 +1,6 @@
+package core.basesyntax;
+
+public abstract class Machine {
+    public abstract void doWork();
+    public abstract void stopWork();
+}

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

@@ -1,5 +1,13 @@
 package core.basesyntax;
 
 public class MainApp {
+    Machine[] machine = {new Bulldozer(), new Excavator(), new Truck()};
 
+        {
+        for (Machine i : machine)
+        {
+            i.doWork();
+            i.stopWork();
+        }
+    }
 }

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

@@ -0,0 +1,13 @@
+package core.basesyntax;
+
+public class Truck extends Machine{
+    @Override
+    public void doWork() {
+        System.out.println("Truck start work");
+    }
+
+    @Override
+    public void stopWork() {
+        System.out.println("Truck stop work");
+    }
+}