Created class Machine and method toWork() and stopWork(),

src/main/java/Bulldozer.java

@@ -0,0 +1,11 @@
+public class Bulldozer extends Machine {
+ @Override
+ public void doWork() {
+ System.out.println("Bulldozer started work!");
+ }
+
+ @Override
+ public void stopWork() {
+ System.out.println("Bulldozer stopped work!");
+ }
+}

src/main/java/Excavator.java

@@ -0,0 +1,11 @@
+public class Excavator extends Machine {
+ @Override
+ public void doWork() {
+ System.out.println("Excavator started work!");
+ }
+
+ @Override
+ public void stopWork() {
+ System.out.println("Excavator stopped work!");
+ }
+}

src/main/java/Machine.java

@@ -0,0 +1,5 @@
+public abstract class Machine {
+ public abstract void doWork();
+
+ public abstract void stopWork();
+}

src/main/java/MainApp.java

@@ -0,0 +1,16 @@
+public class MainApp {
+ public static void main(String[] args) {
+ Excavator excavator = new Excavator();
+ Bulldozer bulldozer = new Bulldozer();
+ Truck truck = new Truck();
+
+ Machine[] machine = new Machine[] {excavator, bulldozer, truck};
+ for (Machine machinery : machine) {
+ machinery.doWork();
+ machinery.stopWork();
+ }
+
+ }
+}
+
+

src/main/java/Truck.java

@@ -0,0 +1,13 @@
+public class Truck extends Machine {
+ @Override
+ public void doWork() {
+
+ System.out.println("Truck started work!");
+ }
+
+ @Override
+ public void stopWork() {
+
+ System.out.println("Truck stopped work");
+ }
+}