命令模式

设计模式/行为型设计模式

简述

把一个请求或者操作封装到一个对象中以便使用不同的请求、队列或者日志来参数化其他对象

UML图

代码

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@Slf4j
public class Receiver {
public void receive() {
log.debug(“接受者”);
}
}

// 命令角色
public interface CatCommand {
void command();
}

// 具体命令
@Slf4j
public class DefaultCommand implements CatCommand {
private Receiver receiver;

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

@Override
public void command() {
log.debug("默认命令 -- ");
receiver.receive();
}
}

@Slf4j
public class Invoker {
private CatCommand catCommand;

public Invoker(CatCommand catCommand) {
this.catCommand = catCommand;
}

public void invoke() {
log.debug(“执行者”);
catCommand.command();
}
}

// 客户端
public class Client {
public static void main(String[] args) {
Receiver receiver = new Receiver();
CatCommand catCommand = new DefaultCommand(receiver);
Invoker invoker = new Invoker(catCommand);
invoker.invoke();
}
}