MultiThread/pattern/src/main/java/cn/bunny/pattern5/demo3/CommandDemo.java

package cn.bunny.pattern5.demo3;

import lombok.Setter;

public class CommandDemo {
    public static void main(String[] args) {
        Receiver receiver = new Receiver();

        ConcreteCommand concreteCommand = new ConcreteCommand(receiver);

        Invoker invoker = new Invoker();
        invoker.setCommand(concreteCommand);
        invoker.invoke();
    }

    // 命令接口
    interface Command {

        /**
         * 执行方法
         */
        void execute();
    }

    //  接受者
    static class Receiver {
        public void action() {
            System.out.println("接受者 执行。。。");
        }
    }

    // 具体的执行命令
    static class ConcreteCommand implements Command {

        private final Receiver receiver;

        public ConcreteCommand(Receiver receiver) {
            this.receiver = receiver;
        }

        /**
         * 执行方法
         */
        @Override
        public void execute() {
            receiver.action();
        }
    }

    @Setter
    static class Invoker {
        private Command command;

        public void invoke() {
            command.execute();
        }
    }
}