Java-马士兵设计模式学习笔记-命令模式

一、概述

命令模式

二、代码

1.Client.java

public class Client {
    
    public void request(Server server){
        server.addCommand(new TextCommand());
        server.addCommand(new ImageCommand());
        server.doSomething();
    }
}

2.Server.java

public class Server {

    private List<Command> commands = new ArrayList<Command>();

    public void doSomething() {
        for(Command c : commands){
            c.execute();
        }
    }

    public void addCommand(Command command) {
        commands.add(command);
    }

}

3.Command.java

public abstract class Command {
    
    public abstract void execute();
    public abstract void unDo();

}

4.TextCommand.java

public class TextCommand extends Command {

    @Override
    public void execute() {
        System.out.println("TextCommand...........");
    }

    @Override
    public void unDo() {
        // 涉及到操作的历史记录
    }

}

5.ImageCommand.java

public class ImageCommand extends Command {

    @Override
    public void execute() {
        System.out.println("ImageCommand...........");
    }

    @Override
    public void unDo() {
        // 涉及到操作的历史记录
    }

}

6.Test.java

public class Test {
    
    @org.junit.Test
    public void test(){
        Client c = new Client();
        c.request(new Server());
    }

}

三、运行结果