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  • 命令模式

    命令模式通常包含下面几个角色:

    1、Client:创建一个命令,并决定接受者

    2、Command:命令接口,定义一个抽象方法

    3、ConcreteCommand:具体命令,负责调用接受者的相应操作

    4、Invoker:请求者,负责调用命令对象执行请求,调用者可能会对在调用时加入自己需求

    5、Receiver:接受者,负责具体实施和执行一次请求

    Client

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

    Command

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

    Receiver

    package design.pattern.command;
    
    public interface Receiver {
        public void action();
    }

    ConcreteConmmand

    package design.pattern.command;
    
    public class ConcreteCommand implements Command {
        private Receiver receiver;
        
        public ConcreteCommand(Receiver receiver) {
            this.receiver = receiver;
        }
        @Override
        public void execute() {
            receiver.action();
        }
    
    }

    ConcreteReceiver

    package design.pattern.command;
    
    public class ConcreteReceiver implements Receiver {
    
        @Override
        public void action() {
            System.out.println("action");
        }
        
    }
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  • 原文地址:https://www.cnblogs.com/m2492565210/p/7243678.html
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