Added Machine, added Truck, Bulldozer, and Excavator that inherit fro…

…m Machine. Call doWork and stopWork

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

@@ -1,4 +1,13 @@
 package core.basesyntax;
 
-public class Bulldozer {
+public class Bulldozer extends Machine{
+    @Override
+    public void doWork() {
+        System.out.println("Bulldozer do work");
+    }
+
+    @Override
+    public void stopWork() {
+        System.out.println("Bulldozer stop work");
+    }
 }

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

@@ -1,4 +1,13 @@
 package core.basesyntax;
 
-public class Excavator {
+public class Excavator extends Machine {
+    @Override
+    public void doWork() {
+        System.out.println("Excavator do work");
+    }
+
+    @Override
+    public void stopWork() {
+        System.out.println("Excavator stop work");
+    }
 }

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

@@ -1,4 +1,6 @@
 package core.basesyntax;
 
-public class Machine {
+public abstract class Machine {
+    public abstract void doWork();
+    public abstract void stopWork();
 }

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

@@ -1,5 +1,17 @@
 package core.basesyntax;
 
 public class MainApp {
+    public static void main(String[] args) {
+        Machine[] machines = {
+                new Bulldozer(),
+                new Excavator(),
+                new Truck()
+        };
+
+        for (Machine machine : machines) {
+            machine.doWork();
+            machine.stopWork();
+        }
+    }
 
 }

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

@@ -1,4 +1,13 @@
 package core.basesyntax;
 
-public class Truck {
+public class Truck extends Machine{
+    @Override
+    public void doWork() {
+        System.out.println("Truck do work");
+    }
+
+    @Override
+    public void stopWork() {
+        System.out.println("Truck stop work");
+    }
 }