finished

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");
+
+    }
+}

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

@@ -0,0 +1,17 @@
+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");
+
+    }
+}

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 +1,14 @@
 package core.basesyntax;
 
 public class MainApp {
+    public static void main(String[] args) {
+        Machine[] MachineArray = {new Truck(), new Bulldozer(), new Excavator()};
+        for (Machine machine : MachineArray) {
+            machine.doWork();
+            machine.stopWork();
+
+        }
+    }
+
 
 }

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");
+
+    }
+}