added class Machine, Truck, Bulldozer, Excavator and called methods d…

[tbasy]

…oWork, stopWork

[okuzan]

mate checkstyle doesn't provide for a line after class definition, please fix everywhere

Suggested change

[okuzan]

why do you create strings here? Create machine array instead: new Machine[]{new Truck(), etc}

[okuzan]

Please, make sure the build passes before requesting a review (locally you can run mvn clean package)

[Ivan95kos]

try using a `for' loop for machines

Suggested change

	public static void main(String[] args) {
	Machine[] machines = new Machine[]{new Truck(), new Bulldozer(), new Excavator()};
	Machine truck = new Truck();
	truck.doWork();
	truck.stopWork();
	Machine bulldozer = new Bulldozer();
	bulldozer.doWork();
	bulldozer.stopWork();
	Machine excavator = new Excavator();
	excavator.doWork();
	excavator.stopWork();
	}
	public static void main(String[] args) {
	Machine[] machines = new Machine[]{new Truck(), new Bulldozer(), new Excavator()};
	// here
	}