added classes and overrided the methods

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 is working.");
+ }
+
+ @Override
+ public void stopWork() {
+ System.out.println("Bulldozer stopped working.");
+ }
+}

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 is working.");
+ }
+
+ @Override
+ public void stopWork() {
+ System.out.println("Excavator stopped working.");
+ }
+}

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

@@ -0,0 +1,9 @@
+package core.basesyntax;
+
+public abstract class Machine {
+ public abstract void doWork();
+
+ public abstract void stopWork();
+
+
+}

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

@@ -0,0 +1,14 @@
+package core.basesyntax;
+
+public class Truck extends Machine{
+
+ @Override
+ public void doWork() {
+ System.out.println("Truck is working.");
+ }
+
+ @Override
+ public void stopWork() {
+ System.out.println("Truck stopped working.");
+ }
+}