best java design patterns book

structure that accepts the operation can remain unchanged. The visitor pattern is suitable for systems with relatively indeterminate data structures, which frees up the coupling between the structure and the operation of the structure so that the set of operations can evolve relatively freely. The visitor pattern makes it easy to add new operations, which is to add a new visitor class. The visitor pattern concentrates the behavior on a visitor object, rather than spreading it across a node clas

, the interface is incompatible; You want to create a reusable class that works with some classes that are not much related to each other, including some that might be introduced in the future; A unified output interface is required, and the type of the input terminal is unpredictable. Depending on the situation, the adapter pattern is flexibly applied to the actual development.Summing up, the advantages of the Adapter model are basically clear: Better reusabilityThe system

Design PatternsDesign pattern: An effective idea to solve this problem.Design Patterns: Solutions for solving specific problems that recur in a given environment.Design Pattern Learning Overview★ Why to learn Design patterns1, design patterns are some of the relatively excel

rejected the shortcomings of the simple factory model.But at the same time the factory method model also has some shortcomings, each time we add new products for the factory method to write a new product class, but also to introduce the abstraction layer, when the product type is very long, there will be a large number of corresponding factory objects, which will inevitably lead to complex class structure, so for the simple case, The use of the factory method model requires consideration of whe

Have seen a lot of design patterns of the article, and some of the implementation of the present seems to be some problems, so now on the previous read about the design patterns of the article summarized here, the essay has cited other materials, and according to their own understanding of the re-implementation of the

code with a template method that invokes these new operations.Controls the subclass extension. The template method invokes the "hook" operation only at a specific point, so that only those points are allowed to be extended.The source code for these design patterns is not to be made clear by a few words, so I created a Java Architecture Technology Exchange Group:

In the book "Java and Patterns" of Dr. Shanhong, this describes the interpreter (interpreter) Pattern:The interpreter pattern is the behavior pattern of the class. Given a language, the interpreter pattern can define a representation of its grammar and provide an interpreter at the same time. The client can use this interpreter to interpret the sentences in the l

} + the}Problem: Due to compiler optimization reasons and JVM underlying internal model reasons. There are occasional problems. How to implement a static inner class: PackageCom.roc.singlet;/*** Static Inner class implementation method *@authorLIAOWP **/ Public classSingletPatter4 {Private Static classsingletpatterinstance{Private StaticSingletPatter4 instance =NewSingletPatter4 ();} Public StaticSingletPatter4 getinstance () {//use to call the internal class loading mode, that is, lazy loadi

data structures relative to the undecided system it has a coupling solution between the structure and the action of the structure.Stripping allows the set of operations to be relatively free to evolve the visitor pattern, making it easy to add new operations and adding a new visitor class visitor patternThe behavior is concentrated in a visitor object instead of being scattered across the node class when you use the visitor pattern to put as many object-browsing logicIn the visitor class instea

In the previous section, we talked about what patterns are, what design patterns are, and how to observer a design pattern. We believe that the concept of the model should be a comparative understanding. This part and later content, will step into the topic, from the Java Cl

know as little as possible about other objects.Basic idea: reduce coupling.g: the principle of synthetic multiplexingInstead of using inheritance, it is preferable to use a combination rather than an inheritance principle, which is to use the composition/aggregation method first.Basic idea: In taking advantage of the object's lowest point, the combination is preferred, not the inheritance, because any changes to the parent class can directly affect the behavior of the subclass.eg. To pack an el

Design pattern-- Reusable Object-oriented Software Foundation (patterns)I. Classification of design PatternsIn general, design patterns fall into three broad categoriesCreation Mode: Factory method mode, abstract Factory mode, simple interest mode, builder mode, prototype mo

If you are involved in java-related development, it is inevitable to use abstraction and encapsulation, which is a feature of java, but also every developer must master, Java is so, and so is Android. And the design pattern is to tell us how to write efficient and more applicable and extensibility of the code, recently

Six basic guidelines for JAVA design patterns to followa single principle of responsibility: (Responsibility pinciple)　A class is responsible for only one responsibility. When more than one responsibility is required, new classes need to be added to take responsibility for new responsibilities, rather than personality codes in the class.If a class takes on too ma

Design in design mode, Factory method is also a relatively simple one, but the application is very broad, ejb,rmi,com,corba,swing can see the shadow of this pattern, It is one of the most important patterns. In many places we see xxxfactory classes like this, so what is factory method, why use this pattern, how to use the Jav