实验1：命令模式.doc

实验1：命令模式一、实验目的本实验要求学生掌握命令模式，要求学生理解命令模式中的四种角色并完成类的定义及测试。二、实验任务1 在军队作战中，指挥官请求三连偷袭敌人，但是指挥官不希望或无法直接与三连取得联系。使用命令模式分析有哪些类以及这些类的角色，完成这些类的定义并进行测试。接收者：Receiver类命令接口：Command类具体命令：ConcreteCommand类请求者： Invoker类import java.lang.*;class Receiverpublic void sneakAttack()System.out.println(I konw);interface Commandpublic abstract void execute();class ConcreteCommand implements CommandReceiver army;ConcreteCommand(Receiver army)this.army = army;public void execute()army.sneakAttack();class InvokerCommand command;public void setCommand(Command command)mand = command;public void startExecuteCommand()command.execute();public class Main public static void main(String args)Receiver thirdArmy = new Receiver();Command command = new ConcreteCommand(thirdArmy);Invoker superior = new Invoker();superior.setCommand(command);superior.startExecuteCommand();2 茱丽(Julia)不需要知道播音(play)、倒带(rewind)和停止 (stop)功能是怎么具体执行的，这些命令执行的细节全都由键盘(Keypad)具体实施。茱丽(Julia)只需要在键盘上按下相应的键便可以了。使用命令模式分析有哪些类以及这些类的角色，完成这些类的定义并进行测试。接收者：Play类 Stop类 Rewind类命令接口：KeypadCommand类具体命令：StopKeypadCommand类 PlayKeypadCommand类 RewindKeypadCommand类请求者：Julia类import java.lang.*;class Playpublic void play()System.out.println(This is Play);class Rewindpublic void rewind()System.out.println(This is Rewind);class Stoppublic void stop()System.out.println(This is Stop);interface KeypadCommandpublic abstract void execute();class PlayKeypadCommand implements KeypadCommandPlay play;PlayKeypadCommand(Play play)this.play = play;public void execute()play.play();class RewindKeypadCommand implements KeypadCommandRewind rewind;RewindKeypadCommand(Rewind rewind)this.rewind = rewind;public void execute()rewind.rewind();class StopKeypadCommand implements KeypadCommandStop stop;StopKeypadCommand(Stop stop)this.stop = stop;public void execute()stop.stop();class JuliaKeypadCommand command;public void setCommand(KeypadCommand command)mand = command;public void clickKeypad()command.execute();public class Main public static void main(String args)Julia julia = new Julia();KeypadCommand stopCommand = new StopKeypadCommand(new Stop();KeypadCommand playCommand = new PlayKeypadCommand(new Play();KeypadCommand rewindCommand = new RewindKeypadCommand(new Rewind();julia.setCommand(stopCommand);julia.clickKeypad();julia.setCommand(playCommand);julia.clickKeypad();julia.setCommand(rewindCommand);julia.clickKeypad();电视机遥控器：电视机是请求的接收者，遥控器是请求的发送者，遥控器上有一些按钮，不同的按钮对应电视机的不同操作。抽象命令角色由一个命令接口来扮演，有三个具体的命令类实现了抽象命令接口，这三个具体命令类分别代表三种操作：打开电视机、关闭电视机和切换频道。使用命令模式分析有哪些类以及这些类的角色，完成这些类的定义并进行测试。接收者：TV类命令接口：Command类具体命令：OnTvCommand类 OffTvCommand类 SwitchChannelCommand类请求者：RemoteControl类import java.lang.*;class TVpublic void on()System.out.println(This is Open TV);public void off()System.out.println(This is Close TV);public void switchChannel()System.out.println(This is Switch Channel);interface Commandpublic abstract void execute();class OnTvCommand implements CommandTV tv;OnTvCommand(TV tv)this.tv = tv;public void execute()tv.on();class OffTvCommand implements CommandTV tv;OffTvCommand(TV tv)this.tv = tv;public void execute()tv.off();class SwitchChannelCommand implements CommandTV tv;SwitchChannelCommand(TV tv)this.tv = tv;public void execute()tv.switchChannel();class RemoteControlCommand command;public void setCommand(Command command)mand = command;public void clickButton()command.execute();public class Main public static void main(String args)RemoteControl rc = new RemoteControl();TV myTv