made changes

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

@@ -0,0 +1,15 @@
+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 finished the job");
+
+ }
+}

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 started working");
+
+ }
+
+ @Override
+ public void stopWork() {
+ System.out.println("Excavator finished the job");
+
+ }
+}

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

@@ -0,0 +1,7 @@
+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() {
+ Machine bulldozer = new Bulldozer();
+ Machine truck = new Truck();
+ Machine excavator = new Excavator();
+ Machine[] machines = {bulldozer, truck, excavator};
+ for (int i = 0; i < machines.length; i++) {
+ machines[i].doWork();
+ machines[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 started working");
+ }
+
+ @Override
+ public void stopWork() {
+ System.out.println("Truck finished the job");
+ }
+}