设计模式之---命令模式

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定义：将一个请求封装成一个对象，从而让你使用不同的请求把客户端参数化，对请求排队或者记录请求日志，可

以提供命令的撤销和恢复功能。

package command;public class Receiver {public void doSomething(){          System.out.println("接收者执行业务逻辑处理");      }  }

package command;public interface Command {void execute();}

package command;public class ConcreteCommand implements Command {Receiver receiver;public ConcreteCommand(Receiver receiver) {this.receiver=receiver;}@Overridepublic void execute() {// TODO Auto-generated method stubreceiver.doSomething();}}

package command;public class Invoker {private Command command;      public void setCommand(Command command) {          this.command = command;      }      public void action(){          this.command.execute();      }  }

package command;public class Client {      public static void main(String[] args){          Receiver receiver = new Receiver();          Command command = new ConcreteCommand(receiver);          //客户端直接执行具体命令方式         command.execute();            //客户端通过调用者来执行命令          Invoker invoker = new Invoker();          invoker.setCommand(command);          invoker.action();      }  }

命令模式优缺点：

命令模式适用场景：

该不该引入设计模式：

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