free vector pattern design

strategypattern, the responsibility for selecting the particularImplementation to use are done by the Client object and are given to theContext of the strategy pattern. Coupling of strategy with contextThe strategy pattern requires that the algorithms that are encapsulated must be outside the class (Context) in which they are used. That is to say that it either passes the information strateg

I believe we all like creative icon design. In this article, Mango collects a refreshing set of icons suitable for 30+ design developers. You will find some mini icons, pictographic icons, wireframe icons, ecommerce icons, toolbar icons, mobile app icons ... And so on, the countless examples. WEB Developer Chart Set Default ICON Default icon is a simple set of simple

(string[] args) throws Executionexception, Interruptedexception {Forkjoinpool pool = new Forkjoinpool ();Cumulative Sum 0-20000000LCounttask task = new Counttask (0, 20000000L);Forkjointask result = Pool.submit (Task);SYSTEM.OUT.PRINTLN ("sum result:" + result.get ());}}The Forkjoin thread pool uses a lock-free stack to manage idle threads, which may be suspended if a worker thread temporarily does not get the available tasks.The suspended thread is

To you illustrator software users to detailed analysis of the design of the beautiful spiral dot pattern of the drawing tutorial. Share list: 1. Free to pull the vertical and horizontal one of the guide line, take the cross location point. Draw a circle, no fill, pure line is good. Please refer to the picture for the position of the circle.

The first time to study one months, read the "Big Talk design mode" and "Effective C + +" two books, the first half of the two books are relatively easy, but later parts, such as: C + + memory, exception and template knowledge is difficult to understand. It may be that you rarely use exception handling and template relationships with yourself. I insisted on one months, anyway, these two books brought me a lot of new knowledge, found their shortcomings

Accumulate to provide all operations (implementations) to define the behavior of subclassesUse one of the simplest examples to illustrate this patternPlayer-manipulated heroes, the protagonist of the game, will have many skills, and we want to define many different skills for the player to use.First we define a Skillbase class as the base class, and the actions of all our skills are implemented here. We can combine a variety of skills from these primitive actions, even hundreds, to

synchronize? Public classsingletonclass{Private StaticSingletonclass instance =NULL; Public StaticSingletonclass getinstance () {if(Instance = =NULL){ synchronized(Singletonclass.class){ if(Instance = =NULL) {instance=NewSingletonclass (); } } } returninstance; } PrivateSingletonclass () {}}Do you have any questions? First determine if instance is NULL, if NULL is going to synchronize, and if not NULL, the instance object is returned di

The Producer-consumer producer-consumer model we are introducing here is a well-known design pattern in multithreaded design patterns. When it comes to producer-consumer problems, most people are not unfamiliar with the classic problem of OS class, and it is a common problem in computer programming. For its application, can cite countless examples, small to a mul

, create color theme, you can save the resulting swatches, sent to Adobe Software, For example illustration and Photoshop, very simple and convenient. It can also directly from the picture to extract color, while providing a color wheel, preset color mode, RGB slider, etc., adjust the color board is very convenient. 　Adobe Ideas (vector graphic painting) This is one of the best iphone apps we've ever encountered, and the good news is th

　　The Observer pattern defines a one-to-many dependency between objects, so that when an object's state changes, all its dependents are notified and updated.The object being observed is called the subject (Subject), and the object that observes the observed object is called the Observer (Observer).Real-world observer patterns: for example newspaper subscriptions. Different people (Observer) order newspapers to the newspaper (Subject), and when a newsp

In the book "Design mode: The basis of reusable object-oriented software" in Gof, the memo pattern is said to capture the internal state of an object without compromising encapsulation, and to save the state outside of that object. The object can then be restored to its previously saved state. Class diagrams and instances: A simple pattern instance:#include #incl

obtained directly, when all subclasses establish the object, it is necessary to see how the parent class initializes the data, to first access the constructors in the parent class when all subclasses initialize them, and to access the constructor specified in the parent class by manually defining the super (XX,XX ) in a way. Attention The super statement must be defined in the first row of the subclass constructor Conclusion: All constructors of subcl

Objective And to the end of the year, also quiet heart to write code, we are very impetuous, turn out the classic "Paladin" play for a while, and play Big Boss, first save the file bar. This is my habit, before playing Big Boss, have to save a file, if won, and then save a file, cover before, if lost, restore the previous archive, then again. I think that's how we all play it. Oh, it's always a hit. OK, no, but the game's archive behavior fascinates me, how does it happen? With a curious heart,

Design Pattern visitor Banqiao Renren http://www.jdon.com Click here to attend monthly design model lectures Visitor mode definitionOperations on objects in an object group. This allows you to define new operations on these objects without changing the objects themselves. In Java, the visitor mode separates elements in the collection structure from the ope

Google code base is a similar SourceForge open source community, where a large number of developers to upload their own code or material to share with others, Google code base launched in 2006, has accumulated a lot of good things, this article from the Google Code library to collect 15 A very good tool and material, they are based on the GPL, BSD, MIT or Creative Common protocol, can be used for free. 1. Twotiny This is a set of micro-icon seri

error that the function would repeatedly define. After the PHP 5.3 version, the official Spl_autoload_register ()was provided; Method instead of the __aotoload () method.Spl_autoload_register () is characterized by the existence of multiple spl_autoload_register () methods.Modify test.php:phpspl_autoload_register (' autoload1 '); Test1::test (); Test2::Test (); function autoload1 ($class) { require __dir__. ' /‘. $class. " php ';}The results of the page output are unchanged.At this point, if

singletonholder.instance, causing the Singletonholder class to be initialized, and when the class is loaded and initialized, it initializes its static domain to create an instance of singleton, because it is a static domain, so only when the virtual machine loads the class Initialized once and is guaranteed to be thread-safe by a virtual machine.The advantage of this pattern is that the GetInstance method is not synchronized and only performs a domai

of the most important principles in object-oriented design, and many other design principles are a means to realize the open-closed principle. For extensions that are open and closed for modifications, this means that the behavior of the module can be extended. When the requirements of the application change, we can extend the module to the new behavior that satisfies those changes. In other words, we can

Template design Pattern Definition:Defining the skeleton of an algorithm in an operation, and delaying some steps into subclasses, the template method allows subclasses to redefine some specific steps of the algorithm without altering the structure of the algorithm.The popular point of understanding is: To complete one thing, there are a fixed number of steps, but each step according to the different object

JPA, as part of the JAVAEE5 specification, has a number of implementations, such as Hiberante,toplink, Eclipselink, and OPENJPA, and many ORM frameworks. JPA is not only used in EJB3, you can also apply applications outside of EJB3, such as spring. Even the author of Gavin King Hiberante also recommends using JPA in the second edition of Hiberante in Action. It is clear that JPA will be widely used. Once you're familiar with annotation and you've tried a program like Hello World, you'll feel li