/** * <p>Title: </p> * <p>Description: </p> * <p>Copyright: Copyright (c) 2002</p> * <p>Company: The9.com</p> * @author Jerry Shen * @version 0.5 */public class TestCommand {    public TestCommand() {    }    public static void main(String[] args) {           Light testLight = new Light();           LightOnCommand testLOC = new LightOnCommand(testLight);           LightOffCommand testLFC = new LightOffCommand(testLight);           Switch testSwitch = new Switch(testLOC, testLFC);           testSwitch.flipUp( );           testSwitch.flipDown( );           Fan testFan = new Fan( );           FanOnCommand foc = new FanOnCommand(testFan);           FanOffCommand ffc = new FanOffCommand(testFan);           Switch ts = new Switch( foc,ffc);           ts.flipUp( );           ts.flipDown( );    }}    //----------  Class Fan  ------------------------------    class Fan {          public void startRotate() {                 System.out.println("Fan is Rotating now !");          }          public void stopRotate() {                 System.out.println("Fan is stop now !");          }    }    //-----------------------------------------------------    //----------  Class Light  ----------------------------    class Light {          public void turnOn() {                 System.out.println("Light is on now !");          }          public void turnOff() {                 System.out.println("Light is off now !");          }    }    //-----------------------------------------------------    //----------  Class Switch  ---------------------------    class Switch {          private Command UpCommand, DownCommand;          public Switch (Command Up, Command Down) {                 UpCommand = Up;                 DownCommand = Down;          }          void flipUp() {               UpCommand.execute();          }          void flipDown() {               DownCommand.execute();          }    }    //-----------------------------------------------------    //----------  Class LightOnCommand  -------------------    class LightOnCommand implements Command {        private Light myLight;        public LightOnCommand (Light L) {               myLight = L;        }        public void execute() {               myLight.turnOn();        }    }    //-----------------------------------------------------    //----------  Class LightOffCommand  ------------------    class LightOffCommand implements Command {        private Light myLight;        public LightOffCommand (Light L) {               myLight = L;        }        public void execute() {               myLight.turnOff();        }    }    //-----------------------------------------------------    //----------  Class FanOnCommand  ---------------------    class FanOnCommand implements Command {          private Fan myFan;          public FanOnCommand (Fan F) {                 myFan = F;          }          public void execute() {                 myFan.startRotate();          }    }    //-----------------------------------------------------    //----------  Class FanOffCommand  ---------------------    class FanOffCommand implements Command {          private Fan myFan;          public FanOffCommand (Fan F) {                 myFan = F;          }          public void execute() {                 myFan.stopRotate();          }    }    //-----------------------------------------------------