jv-oop

• Create class Machine containing methods public abstract void doWork() and public abstract void stopWork().
• Create classes Truck, Bulldozer, Excavator that will inherit from Machine.
• In those classes override doWork(), so it will print message that certain machine started its work.
• Override stopWork() as well. It should print messages that certain machine stopped its work.
• In Main class create an object of each class.
• Start work of all machines and then stop them.

Try to avoid these common mistakes, while solving task