java decorator

One, decorator mode1. Definition and roleThis mode extends the functionality of the object in a transparent manner to the client.2. Role-relatedAbstract component role: Defines an abstract interface to standardize the classes that prepare additional functionality.Concrete Component role: the class that will be attached to the function, implementing the abstract component role interface.Abstract Decorator Ro

Decorator Mode (Decorator pattern) Java IO class usageThis address: http://blog.csdn.net/caroline_wendy/article/details/26716823Decorator Mode (decorator pattern) See: http://blog.csdn.net/caroline_wendy/article/details/26707033the Java IO class is extended using

In Java, many of the classes under IO packages are typical of decorator patterns, such as:New Bufferedoutputstream (OutputStream out)New Bufferedinputstream (InputStream in);New PrintWriter (OutputStream out)New FilterReader (Reader in);The decoration class implements the same interface as the decorated class,Be decorated class, do not care specifically which implementation class to decorate it,The same bus

similar I/O operations to Java are, public class Test {public static void main (string[] args) {Human PE Rson = new Person (); Decorator Decorator = new Decorator_two (new Decorator_first (new Decorator_zero (person)); Decorator.wearclothes (); Decorator.walktowhere (); } }Operation Result:The fact is to go into the house to fi

how to invoke:Work squarepeg = new Squarepeg ();Work decorator = new Decorator (squarepeg);Decorator.insert ();The decorator mode is now complete.If you are careful, you will find that the call above is similar to the one we read from the file:FileReader FR = new FileReader (filename);BufferedReader br = new BufferedReader (FR);In fact,

, which can complicate the program if overused.3. The adornment mode is programmed for the abstract component (Component) type. However, if you are programming for a specific component, you should rethink your application architecture and whether the decorator is appropriate. Of course, you can change the component interface, add new public behavior, and realize the "translucent" decorator pattern.Vii. Prin

same parent class).(2) The decorator holds a reference to a decorated person.(3) The adorner accepts all client requests, and these requests are eventually returned to the decorated person (see Wayne Chart).(4) Dynamically adding properties to an object at run time without changing the structure of the object. The greatest advantage of using the decorator pattern is that it is very well developed, and the

combination of objects, it is possible to mix and match the beverage and seasoning more flexibly.Code External details:When implemented in code, the decorator can be passed into the decorator by the constructor, as in the final invocation form as follows:Beverage beverage = new Darkroast ();Beverage = new Mocha (beverage);Beverage = new Whip (beverage);The two-tier wrapper is completed, and the cost () fun

insert, just to illustrate that the extra function order can be arranged arbitrarily. Well, decorator mode comes out and we see how to call: Copy Code code as follows: Work squarepeg = new Squarepeg (); Work decorator = new Decorator (squarepeg); Decorator.insert (); The decorator mode is co

run time.2. Classes should be designed to be open to extensions and closed for modification. Example: Use the configuration coffee drink to do the exampleFor example, there is now a beverage class (beverage) that adds different ingredients to the beverage (steamed milk (steamed Milk), soy milk (Soy),Mocha (Mocha, which is chocolate flavor) or covered with milk foam), will be formulated a variety of different kinds of drinks, the price also varies with the added ingredient, the beverage store ne

now complete.If you are careful, you will find that the call above is similar to the one we read from the file: New filereader (filename); New BufferedReader (FR);In fact, Java I/O API is implemented using decorator, I/O variants are many, if all take the inheritance method, will produce many subclasses, obviously quite cumbersome.Implementation of decorator