Command_Pattern

最新推荐文章于 2025-06-04 00:45:50 发布

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#command_pattern #design_pattern #java

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本文深入解析了命令模式设计，展示了如何通过将请求封装为对象来参数化操作，从而实现请求的解耦。通过具体实例，文章详细介绍了命令模式的组成部分，包括Command、ConcreteCommand、Receiver和Invoker，并演示了它们之间的交互过程。

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package command_pattern;

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

package command_pattern;

public class ConcreteCommand extends Command{
public ConcreteCommand(Receiver receiver) {
super(receiver);
}
@Override
public void executed() {
receiver.action();//Give the command to receiver.
}
}

package command_pattern;

public class Receiver {
public void action() {
System.out.println("Executed the request.");
}
}

package command_pattern;

public class Invoker {
private Command command;//It can gather a set of commands to execute together
//through using ArrayList<T>.
public void setCommand(Command command) {
this.command = command;
}
public void executedCommand() {
command.executed();
}
}

package command_pattern;

public class Main {
public static void main(String args[]) {
Receiver r = new Receiver();
Command c = new ConcreteCommand(r);//Map the command and receiver together.
Invoker i = new Invoker();
i.setCommand(c);//Invoker composites the command so as to invoke different
//command.The super class command composite the receiver so as to send the
//command to the related receiver.
i.executedCommand();
}
}
This is a general introduction to the 23 design patterns：
https://blog.youkuaiyun.com/GZHarryAnonymous/article/details/81567214

See more source code:[GZHarryAnonymous](https://github.com/GZHarryAnonymous/Design_Pattern)