added implementation of abstract class machine and its subclasses

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

@@ -1,5 +1,16 @@
 package core.basesyntax;
 
-public class MainApp {
+import core.basesyntax.machine.Bulldozer;
+import core.basesyntax.machine.Excavator;
+import core.basesyntax.machine.Machine;
+import core.basesyntax.machine.Truck;
 
+public class MainApp {
+ public static void main(String[] args) {
+ Machine[] machines = new Machine[]{new Excavator(), new Bulldozer(), new Truck()};
+ for (Machine machine : machines) {
+ machine.doWork();
+ machine.stopWork();
+ }
+ }
 }

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

@@ -0,0 +1,13 @@
+package core.basesyntax.machine;
+
+public class Bulldozer extends Machine {
+ @Override
+ public void doWork() {
+ System.out.println("Bulldozer is doing its work!" + super.getStrength());
+ }
+
+ @Override
+ public void stopWork() {
+ System.out.println("Bulldozer has stopped its work!" + super.getRelaxing());
+ }
+}

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

@@ -0,0 +1,13 @@
+package core.basesyntax.machine;
+
+public class Excavator extends Machine {
+ @Override
+ public void doWork() {
+ System.out.println("Excavator is doing its work!" + super.getStrength());
+ }
+
+ @Override
+ public void stopWork() {
+ System.out.println("Excavator has stopped its work!" + super.getRelaxing());
+ }
+}

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

@@ -0,0 +1,23 @@
+package core.basesyntax.machine;
+
+public abstract class Machine {
+ private String strength = "💪"; //just for fun
+ private String relaxing = "🦥"; //just for fun x2
+
+ public abstract void doWork();
+
+ public abstract void stopWork();
+
+ /*
+ * I've decided to set package access for these methods because
+ * I don't want MainApp class to have access to these methods.
+ * */
+
+ String getStrength() {
+ return strength;
+ }
+
+ String getRelaxing() {
+ return relaxing;
+ }
+}

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

@@ -0,0 +1,13 @@
+package core.basesyntax.machine;
+
+public class Truck extends Machine {
+ @Override
+ public void doWork() {
+ System.out.println("Truck is doing its work!" + super.getStrength());
+ }
+
+ @Override
+ public void stopWork() {
+ System.out.println("Truck has stopped its work!" + super.getRelaxing());
+ }
+}