设计模式之命令模式

1.名词解释：
命令模式：将一个请求封装为一个对象，从而使你可用不同的请求对客户进行参数化；对请求排队或记录请求日志，以及支持可撤销的操作。

代码：
抽象命令类：
package CommandPattern;

public abstract class Command {
    protected Receiver receiver;
   
    public Command(Receiver receiver) {
     this.receiver = receiver;
    }
   
    public abstract void execute();
}

具体命令类：
package CommandPattern;

public class ConcreateCommand extends Command {
 
 public ConcreateCommand(Receiver receiver) {
  super(receiver);
 }
 
 public void execute() {
  receiver.excute();
 }

}


调用类：
package CommandPattern;

import java.util.ArrayList;
import java.util.List;

public class Invoker {

 private List<Command> commandList = new ArrayList<Command>();
 
 public void addCommand(Command command) {
  if(command == null) {
   return;
  }
  this.commandList.add(command);
 }
 
 public void delCommand(Command command) {
  if(command == null) {
   return;
  }
  this.commandList.remove(command);
 }
 
 public void ExecuteCommand() {
  for(Command tmpCommand : commandList) {
   tmpCommand.execute();
  }
 }
}

接收者类：
package CommandPattern;

public class Receiver {
    public void excute() {
     System.out.println("You are execute command");
    }
}