added main class

src/main/java/core/basesyntax/Bulldozer.java

@@ -1,2 +1,13 @@
-package core.basesyntax;public class Bulldozer {
+package core.basesyntax;
+
+public class Bulldozer extends Machine {
+ @Override
+ public void doWork() {
+ System.out.println("Bulldozer machine started its work");
+ }
+ @Override
+ public void stopWork() {
+
+ System.out.println("Bulldozer machine stopped its work");
+ }
 }

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

@@ -1,2 +1,14 @@
-package core.basesyntax;public class Excavator {
+package core.basesyntax;
+
+public class Excavator extends Machine {
+ @Override
+ public void doWork() {
+
+ System.out.println("Excavator machine started its work");
+ }
+ @Override
+ public void stopWork() {
+
+ System.out.println("Excavator machine stopped its work");
+ }
 }

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

@@ -1,2 +1,7 @@
-package core.basesyntax;public class Machine {
+package core.basesyntax;
+
+public abstract class Machine {
+ public abstract void doWork();
+ public abstract void stopWork();
+
 }

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

@@ -2,7 +2,13 @@
 
 public class MainApp {
  public static void main(String[] args) {
- System.out.println("Hello world");
+ Truck truck = new Truck();
+ Bulldozer bulldozer = new Bulldozer();
+ Excavator excavator = new Excavator();
+ Machine[] machines = new Machine[]{truck, bulldozer, excavator};
+ for (Machine machine : machines) {
+ machine.doWork();
+ machine.stopWork();
+ }
  }
-
 }

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

@@ -1,2 +1,14 @@
-package core.basesyntax;public class Truck {
+package core.basesyntax;
+public class Truck extends Machine {
+
+ @Override
+ public void doWork() {
+
+ System.out.println("Truck machine started its work");
+ }
+ @Override
+ public void stopWork() {
+
+ System.out.println("Truck machine stopped its work");
+ }
 }