命令模式（实例二）

RECERVER

public class CeilingFan {String location = "";int level;public static final int HIGH = 2;public static final int MEDIUM = 1;public static final int LOW = 0; public CeilingFan(String location) {this.location = location;}  public void high() {// turns the ceiling fan on to highlevel = HIGH;System.out.println(location + " ceiling fan is on high"); } public void medium() {// turns the ceiling fan on to mediumlevel = MEDIUM;System.out.println(location + " ceiling fan is on medium");}public void low() {// turns the ceiling fan on to lowlevel = LOW;System.out.println(location + " ceiling fan is on low");} public void off() {// turns the ceiling fan offlevel = 0;System.out.println(location + " ceiling fan is off");} public int getSpeed() {return level;}}

public class GarageDoor {String location;public GarageDoor(String location) {this.location = location;}public void up() {System.out.println(location + " garage Door is Up");}public void down() {System.out.println(location + " garage Door is Down");}public void stop() {System.out.println(location + " garage Door is Stopped");}public void lightOn() {System.out.println(location + " garage light is on");}public void lightOff() {System.out.println(location + " garage light is off");}}

public class Hottub {boolean on;int temperature;public Hottub() {}public void on() {on = true;}public void off() {on = false;}public void bubblesOn() {if (on) {System.out.println("Hottub is bubbling!");}}public void bubblesOff() {if (on) {System.out.println("Hottub is not bubbling");}}public void jetsOn() {if (on) {System.out.println("Hottub jets are on");}}public void jetsOff() {if (on) {System.out.println("Hottub jets are off");}}public void setTemperature(int temperature) {this.temperature = temperature;}public void heat() {temperature = 105;System.out.println("Hottub is heating to a steaming 105 degrees");}public void cool() {temperature = 98;System.out.println("Hottub is cooling to 98 degrees");}}

public class Light {String location = "";public Light(String location) {this.location = location;}public void on() {System.out.println(location + " light is on");}public void off() {System.out.println(location + " light is off");}}

public class Stereo {String location;public Stereo(String location) {this.location = location;}public void on() {System.out.println(location + " stereo is on");}public void off() {System.out.println(location + " stereo is off");}public void setCD() {System.out.println(location + " stereo is set for CD input");}public void setDVD() {System.out.println(location + " stereo is set for DVD input");}public void setRadio() {System.out.println(location + " stereo is set for Radio");}public void setVolume(int volume) {// code to set the volume// valid range: 1-11 (after all 11 is better than 10, right?)System.out.println(location + " Stereo volume set to " + volume);}}

public class TV {String location;int channel;public TV(String location) {this.location = location;}public void on() {System.out.println("TV is on");}public void off() {System.out.println("TV is off");}public void setInputChannel() {this.channel = 3;System.out.println("Channel is set for VCR");}}

COMMAND

public interface Command {public void execute();}

public class CeilingFanOffCommand implements Command {CeilingFan ceilingFan;public CeilingFanOffCommand(CeilingFan ceilingFan) {this.ceilingFan = ceilingFan;}public void execute() {ceilingFan.off();}}

public class CeilingFanOnCommand implements Command {CeilingFan ceilingFan;public CeilingFanOnCommand(CeilingFan ceilingFan) {this.ceilingFan = ceilingFan;}public void execute() {ceilingFan.high();}}

public class GarageDoorDownCommand implements Command {GarageDoor garageDoor;public GarageDoorDownCommand(GarageDoor garageDoor) {this.garageDoor = garageDoor;}public void execute() {garageDoor.up();}}

public class GarageDoorUpCommand implements Command {GarageDoor garageDoor;public GarageDoorUpCommand(GarageDoor garageDoor) {this.garageDoor = garageDoor;}public void execute() {garageDoor.up();}}

public class HottubOffCommand implements Command {Hottub hottub;public HottubOffCommand(Hottub hottub) {this.hottub = hottub;}public void execute() {hottub.cool();hottub.off();}}

public class HottubOnCommand implements Command {Hottub hottub;public HottubOnCommand(Hottub hottub) {this.hottub = hottub;}public void execute() {hottub.on();hottub.heat();hottub.bubblesOn();}}

public class LightOffCommand implements Command {Light light; public LightOffCommand(Light light) {this.light = light;} public void execute() {light.off();}}

public class LightOnCommand implements Command {Light light;public LightOnCommand(Light light) {this.light = light;}public void execute() {light.on();}}

public class LivingroomLightOffCommand implements Command {Light light;public LivingroomLightOffCommand(Light light) {this.light = light;}public void execute() {light.off();}}

public class LivingroomLightOnCommand implements Command {Light light;public LivingroomLightOnCommand(Light light) {this.light = light;}public void execute() {light.on();}}

public class NoCommand implements Command {public void execute() { }}

public class StereoOffCommand implements Command {Stereo stereo; public StereoOffCommand(Stereo stereo) {this.stereo = stereo;} public void execute() {stereo.off();}}

public class StereoOnWithCDCommand implements Command {Stereo stereo; public StereoOnWithCDCommand(Stereo stereo) {this.stereo = stereo;} public void execute() {stereo.on();stereo.setCD();stereo.setVolume(11);}}

INVOKEF

public class RemoteControl {Command[] onCommands;Command[] offCommands; public RemoteControl() {onCommands = new Command[7];offCommands = new Command[7]; Command noCommand = new NoCommand();for (int i = 0; i < 7; i++) {onCommands[i] = noCommand;offCommands[i] = noCommand;}}  public void setCommand(int slot, Command onCommand, Command offCommand) {onCommands[slot] = onCommand;offCommands[slot] = offCommand;} public void onButtonWasPushed(int slot) {onCommands[slot].execute();} public void offButtonWasPushed(int slot) {offCommands[slot].execute();}  public String toString() {StringBuffer stringBuff = new StringBuffer();stringBuff.append("\n------ Remote Control -------\n");for (int i = 0; i < onCommands.length; i++) {stringBuff.append("[slot " + i + "] " + onCommands[i].getClass().getName()+ "    " + offCommands[i].getClass().getName() + "\n");}return stringBuff.toString();}}

CLIENT

public class RemoteLoader { public static void main(String[] args) {RemoteControl remoteControl = new RemoteControl(); Light livingRoomLight = new Light("Living Room");Light kitchenLight = new Light("Kitchen");CeilingFan ceilingFan= new CeilingFan("Living Room");GarageDoor garageDoor = new GarageDoor("");Stereo stereo = new Stereo("Living Room");  LightOnCommand livingRoomLightOn = new LightOnCommand(livingRoomLight);LightOffCommand livingRoomLightOff = new LightOffCommand(livingRoomLight);LightOnCommand kitchenLightOn = new LightOnCommand(kitchenLight);LightOffCommand kitchenLightOff = new LightOffCommand(kitchenLight);  CeilingFanOnCommand ceilingFanOn = new CeilingFanOnCommand(ceilingFan);CeilingFanOffCommand ceilingFanOff = new CeilingFanOffCommand(ceilingFan); GarageDoorUpCommand garageDoorUp =new GarageDoorUpCommand(garageDoor);GarageDoorDownCommand garageDoorDown =new GarageDoorDownCommand(garageDoor); StereoOnWithCDCommand stereoOnWithCD =new StereoOnWithCDCommand(stereo);StereoOffCommand  stereoOff =new StereoOffCommand(stereo); remoteControl.setCommand(0, livingRoomLightOn, livingRoomLightOff);remoteControl.setCommand(1, kitchenLightOn, kitchenLightOff);remoteControl.setCommand(2, ceilingFanOn, ceilingFanOff);remoteControl.setCommand(3, stereoOnWithCD, stereoOff);  System.out.println(remoteControl); remoteControl.onButtonWasPushed(0);remoteControl.offButtonWasPushed(0);remoteControl.onButtonWasPushed(1);remoteControl.offButtonWasPushed(1);remoteControl.onButtonWasPushed(2);remoteControl.offButtonWasPushed(2);remoteControl.onButtonWasPushed(3);remoteControl.offButtonWasPushed(3);}}