设计模式——装饰模式

被装饰对象调用装饰对象的同一个接口方法，实现被装饰对象的方法

//定义共用接口
public interface ILog {
public void log(String message);
}

public class UserLog implements ILog{

    @Override
     public void log(String message) {
         // TODO Auto-generated method stub
         System.out.println("装饰对象的方法"+message);
     }
}
//
public class Decorator implements ILog{
     private ILog usrLog;

    public Decorator(ILog usrLog) {
         super();
         this.usrLog = usrLog;
     }

    @Override
     public void log(String message) {
         // TODO Auto-generated method stub
         System.out.println("被装饰前");
         this.usrLog.log(message);
         System.out.println("被装饰后");
     }
}

public class Demo {
     public static void main(String[] args) {
         Decorator decorator = new Decorator(new UserLog());
         decorator.log("hello Decorator model");
     }
}