首先来一个命令的接口：
package mode.command;/*** * 定义一个命令接口，其中有一个抽象的执行方法，参数人命令接收器* * */
public interface Command {public void execute(CommandReceiver commandReceiver);
}
定义一个命令接受者的接口：
package mode.command;/*** * 命令接收类，包涵要执行的各种动作* * * */
public interface CommandReceiver {public void doSometingA();public void doSomethingB();
}
两个Command接口的实现类：
package mode.command;public class CommandA implements Command {@Overridepublic void execute(CommandReceiver commandReceiver) {commandReceiver.doSometingA();}}
package mode.command;public class CommandB implements Command {@Overridepublic void execute(CommandReceiver commandReceiver) {commandReceiver.doSomethingB();}}
定义一个命令接收者的实现类，这里使用单例模式来设计这个类
package mode.command;public class CommandReceiverImplSingliton implements CommandReceiver {private static CommandReceiverImplSingliton commandReceiverImplSingliton;public static CommandReceiverImplSingliton getCommandSingliton() {if (null == commandReceiverImplSingliton) {commandReceiverImplSingliton = new CommandReceiverImplSingliton();return commandReceiverImplSingliton;} else {return commandReceiverImplSingliton;}}@Overridepublic void doSometingA() {System.out.println("dodoododododododoodoAAAAA");}@Overridepublic void doSomethingB() {System.out.println("dododoodododoodododoBBBBB");}
}
创建命令执行器：
package mode.command;public class CommandExecutor {public void execute(Command command) {command.execute(CommandReceiverImplSingliton.getCommandSingliton());}
}
用client类来测试：
package mode.command;public class Client {public static void main(String[] args) {Command commandA = new CommandA();Command commandB = new CommandB();CommandExecutor executor = new CommandExecutor();executor.execute(commandA);executor.execute(commandB); }
}
