free vector pattern design

31.2 Object Pool Mode31.2.1 definitions and class diagrams(1) Definition: An object pool is a design pattern that can be reused to share certain scarce or costly resources by managing a finite object.(2) class diagram:31.2.2 extended interface for object pooling(1) Level two object pooling method: Free object pool and used object pool(2) Use wrapper mode to wrap

() method that called them is passed in this and arg as parameters */Publ IC void Notifyobservers (Object arg) {object[] arrlocal; Synchronized (this) {if (!changed) return; arrlocal = Obs.toarray (); Clearchanged (); } for (int i = arrlocal.length-1; i>=0; i--)((Observer) arrlocal[i]). Update (this, ARG); }/** * Will gather the observers to empty */public synchronized void Deleteobservers () {obs.removeallelements (); }/** * Set "changed" to Tru

Field-driven design and pattern practice (recommended by Martin Fowler and Eric Evans) [Author] (Swiss) Jimmy Nilsson [same author's work] [Translator's introduction]Translated by Zhao Li and Ma Yanxin [same translator's work][Book name] Turing programming Series[Release news agency] People's post and telecommunications Publishing House [book no.] 9787115212771[Mounting time][Publication date] May October

//Game One BooleanPlayGame (BooleanFree ); A}The responsibilities defined by this interface are not clear. So we can split it into two interface istudentbo,istudentaction.Attribute Interface Istudentbo: Public Interface Istudentbo { // height void setheight (double height); Double getheight (); // Weight void setweight (double weight); Double getweight (); Behavior Interface Istudentaction: Public Interface istudentaction{boolean Brunch (boolean

1. IntroductionThe combination mode (Composite pattern), also known as part of the overall pattern, is used to treat a similar set of objects as a single object. The combined pattern combines objects based on a tree structure to represent parts and the overall hierarchy. This type of design

Definition: In terms of the design pattern type, the simple factory pattern belongs to the creation pattern, also known as the staticfactory method pattern, but not one of 23 gof design patterns. The simple factory mode is determi

which the private constructor is defined to prevent the use of the new keyword from accessing the constructor outside the class, using the static constructor, which is to initialize the read-only field _instance of this public, global access. From the above explanation, it is also possible to use the CLR-sent mutex for free to execute synchronously and the CLR to ensure that the static constructor is executed only once, that is, the perfect implement

the class into the need to ensure uniqueness and do not need to ensure uniqueness, and sometimes more flexible.Java version compatibility remindersThe garbage collection mechanism before 1,java1.2 is bug-free, causing the singleton instance to be purged without a global reference.Many JVM implementations of volatile before 2,java1.4 cause the double lock method to failSome controversies about the singleton modeIf you've just finished reading my blog

part. How to use composite Define an interface or abstract class first, this is the design pattern common way, the other design pattern has little restriction to the internal definition of the interface, Composite has a stipulation, that is to define an object (or part component) within the interface that is used to

This chapter is the last lecture on design patterns. It will introduce the third design patterns-behavioral patterns, 11 in total: rule mode, template method mode, observer mode, iteration sub-mode, responsibility chain mode, command mode, memorandum mode, state mode, visitor mode, intermediary mode, interpreter mode. I have been writing about the design

, creates one and saves it, which means some singleton patterns. Usually the factory class will have a member variable of the collection type to hold the object, such as Hashtable,vector. In Java, the database connection pool, the thread pool, and so on are the applications that use the enjoy meta-mode.More Java-related content readers can view the topic: Java Data structure and algorithm tutorial, Java Operation DOM node tips summary, Java file and d

First, UML diagramSecond, the conceptiterator Mode (Iterator): provides a way to sequentially access individual elements of an aggregated object without exposing the object's internal representation.Third, the descriptionWhen do you use it?(1) When you need to access a clustered object, and no matter what they need to traverse, you should consider using the iterator pattern.(2) When you need to have multiple traversal of the aggregation, you can consi

class in which subclasses implement methods in the base class in different ways. Then you need to define a factory class where the factory class can generate different subclass instances based on the criteria. When an instance of a subclass is obtained, the developer can call a method in the base class without having to consider which instance of the subclass is returned.If you are interested in the power node , you can visit the website to see the free