外观模式Facade

class wheel{}

class engine{}

class bodywork{}

public class TankFacade

{

wheel[] wheels = new wheel[4];

engine e = new engine();

bodywork b = new bodywork();

public void start(){}

public void stop(){}

public void shot(){}

}

class app

{

TankFacade tankf = new TankFacade();

tankf.start();

tankf.stop();

}