- Create class Machine containing methods
public abstract void doWork()
andpublic abstract void stopWork()
. - Create classes
Truck
,Bulldozer
, andExcavator
that will inherit fromMachine
. - In those classes override
doWork()
, so it will print a message that a certain machine started its work. - Override
stopWork()
as well. It should print messages that certain machines stopped working. - In the
MainApp
class create aMachine
array withTruck
,Bulldozer
, andExcavator
and call methodsdoWork()
andstopWork()
in a loop.