added Machine absct class, descendant classes, and redefined methods

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

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

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

@@ -0,0 +1,14 @@
+package core.basesyntax;
+
+public class Excavator extends Machine {
+
+ @Override
+ public void doWork() {
+ System.out.println("Excavator start doing his work");
+ }
+
+ @Override
+ public void stopWork() {
+ System.out.println("Excavator stop doing his work");
+ }
+}

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 +1,16 @@
 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 +1,13 @@
+package core.basesyntax;
+
+public class Truck extends Machine {
+ @Override
+ public void doWork() {
+ System.out.println("Truck start doing his work");
+ }
+
+ @Override
+ public void stopWork() {
+ System.out.println("Truck stop doing his work");
+ }
+}