设计模式总结5--命令模式 commend pattern

命令模式把发出命令的责任和执行命令
的责任分割开，委派给不同的对象。就像我们去餐厅，点菜是找服务员，然后服务员去让厨师做菜
而不是我们直接找厨师做菜

public interface Commend {
    
    public void execute();
}

public class Remoter {
    
    public void click(Commend cmd){
        cmd.execute();
    }
}

public class OpenLightCommend  implements Commend{

    private Light light;
    
    public OpenLightCommend(Light light){
        this.light = light;
    }
    @Override
    public void execute() {
        
        light.open();
        
    }

}

测试

 

public class test {
    
    public static void main(String[] args) {
        /*命令的执行者light和命令的发出者remoter是分开的，靠着OpenLightCommend
            连接*/
        Light light = new Light();
        
        OpenLightCommend olc = new OpenLightCommend(light);
        Remoter r = new Remoter();
        r.click(olc);
    }
}

 

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宏命令：宏命令是命令的一种简单延伸，允许调用多个命令

public class MarcoCommend implements Commend{

    private Commend[] cmds;
    public MarcoCommend(Commend... cmds){
        this.cmds = cmds;
    }
    
    @Override
    public void execute() {
        for(Commend c : cmds){
            c.execute();
        }
        
    }

}

public class test {
    
    public static void main(String[] args) {
        
        Light light = new Light();
        
        OpenLightCommend olc = new OpenLightCommend(light);
        CloseLightCommend clc = new CloseLightCommend(light);
        MarcoCommend mc = new MarcoCommend(olc,clc);
        
        
        Remoter r = new Remoter();
        r.click(mc);
    }
}