[Java] Java以命令模式设计模式

• Java以命令模式设计模式
  
  
  
  • 1、简单介绍
    
  • 2、命令模式
    
  
  

• received 真正的命令执行对象
  
• Command
  
• invoker 使用命令对象的入口
  

• 降低了系统耦合度。
  
• 新的命令可以很容易添加到系统中去。
  

• GUI 中每一个按钮都是一条命令。
  
• 模拟 CMD。
  

public interface Command {  
  public void exe();  
}  
public class MyCommand implements Command {  
  
  private Receiver receiver;  
    
  public MyCommand(Receiver receiver) {  
    this.receiver = receiver;  
  }  
  
  @Override
  public void exe() {  
    receiver.action();  
  }  
}  
public class Receiver {  
  public void action(){  
    System.out.println("command received!");  
  }  
}  
public class Invoker {  
    
  private Command command;  
    
  public Invoker(Command command) {  
    this.command = command;  
  }  
  
  public void action(){  
    command.exe();  
  }  
}  
public class Test {  
  
  public static void main(String[] args) {  
    Receiver receiver = new Receiver();  
    Command cmd = new MyCommand(receiver);  
    Invoker invoker = new Invoker(cmd);  
    invoker.action();  
  }  
}