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Introduction to OCP (OCP -- open-closed principle ): Software entities (classes, modules, functions, etc.) shocould be open for extension, but closed for modification. The software entity should be open to the extension and closed to the modification, that is, the software entity should be extended without modification (which may be achieved through the proxy mod

In fact, this exception is written very clearly, that is, the session is closed, can not operate on the hibernate entity. There are a lot of such cases, what writing mistakes ah, logic wrong AH. But in this context, about the lazy mechanism: Lazy initialization errors are the most common errors in using Hibernate development projects. If a deferred retrieval policy is configured on a class or collection, it must be initialized when the proxy class ins

This article mainly introduces javascript code for implementing floating ad strips that can be closed at the top of a website. It involves javascript implementation techniques for operating page element styles Based on mouse events, for more information about how to use JavaScript to implement floating ad entries that can be closed at the top of a website, see the example in this article. Share it with you

Recently, the project team has to conduct closed development, but it is clear that there is no need to close the project. Why should it be closed? After thinking for a long time, I come to the following conclusion: Why closed development. It's not a day or night rush. There are three reasons:In order to have a clear limit. In this way, the project cycle will n

agreement (four times)Since TCP connection is full-duplex, so every direction must be independently closed. This principle is when one party after done with its data can be sent to endThe direction of a fin. receive a fin only means no data on this direction flow, a TCP connection after loading ing a fin can send data. first Close Party will perform the initiative, while the other performs passive closure.(1) The tcp client sends a fin, used to close

Android-Socket causes the Socket to close and cannot send and receive data after the IO stream is closed. androidio Use Socket to send data as an example: When sending data, declare: DataOutputStream OS = new DataOutputStream (socket. getOutputStream ()); Recently, I encountered the question: I want to send images to the server. If OS. close () is used, the server will receive the images, but the socket of my client will be affected and

Typically, you use the close output stream to indicate that the output has ended. However, you cannot do this when you are communicating with the network. Because when we close the output stream, the socket corresponding to the output stream will also be closed so that the program will no longer be able to read data from the socket.To cope with this situation, the socket provides two semi-closed methods to

The code is as followsUse $ (' ') to create a jquery object and add it to the Div, firefox/chrome/safari/opera/ie9+ can see the Added link a. Except ie6,7,8.Began to think is 1.6.4 version of the bug (believe that the wording is not a problem), after the change 1.7.0,1.7.2,1.8.0,1.8.3,1.9.1,1.11.1 all this, just surprised.You can just close the A for a minute.var $a = $ (' Orvar $a = $ (' It's no problem.View the document as explained belowRead only know, non-jquery bug, is their own improper us

Morphological Filtering: On, closed, morphological gradient, top hat, black hat, and morphological gradientNot to mention, first 1. Morphological overview II The previous article introduced the expansion and corrosion of basic morphological operations. We will use expansion and corrosion operations to achieve more advanced morphological operations on images, these are based on expansion and corrosion operations. First, morphology is mainly used to ob

When we write user stories or split user stories, it's important to write closed user stories. A closed user story means that when the story is completed, the user can achieve a clear, meaningful goal. I like to play such an analogy, complete a user story, the user can stop to rest for a while, a cup of coffee.Here is an example of a user story that is not closed:Take an online job site as an example: "As a

In daily browser operations, tags are disabled incorrectly. The chrome official blog shares three tips for restoring closed tags. You may wish to use these methods to restore a tag after it is accidentally disabled: 1. You can find the "recently closed tab" at the bottom of the new tab. Here you will find some recently closed labels. Select the tab you want to r

AbstractIn image edge detection, the detected edge is often closed. In this paper, we analyze two common algorithms: The Harf transform and the Canny edge detection algorithm. Finally, discuss the criteria that edge operators should satisfy. KeywordsEdge detection, closed, Harf transformation, and Canny operator 1 IntroductionThe edge of an image refers to the area with significant brightness changes. The

Single principle of responsibilityAs far as a class is concerned, there should be only one cause for it to change.If a class takes on too much responsibility, it is tantamount to coupling these responsibilities, and a change in responsibility may weaken or inhibit the ability of the class to perform other duties. This coupling leads to fragile designs that can be subjected to unexpected damage when the changes occur.The real thing about software design is the discovery of responsibilities and th

Often have friends computer encounters such a problem, open the page when suddenly pop-up "Microsoft Internet Explorer encountered a problem need to shut down ..." information. At this point, if you click the Send Error Report button, an error report is created, and clicking the Close button causes the current IE window to close, and if you click the Do not send button, all IE windows will be closed. Encounter this situation sometimes the user is very

First, IE8 report the following error, Solution:Page Error DetailsMessage: HTML parsing error:unable To modify the parent container element before the child element is closed (KB927917)Line: 0Character: 0Code: 01. See if there are HTML tags that are not closed, such as 2, whether the page is not loaded before the JS code operation of the BODY element, the relevant JS code moved to 3, whether to add a addthi

a real winner ). However, more importantly, Android attracts thousands of developers using open-source names and the charm of Google. Although Android does not allow developers to make a lot of money, in addition, the number of Android mobile phones is less than of that of Apple's products (the number of countries with support charges is 6 times less than that of Apple ). Behind the veil of Open Source What's even more surprising is how closed Androi

Install the closed-source driver, media codecs, and other prohibited software on Linux. A typical Linux system consists of unrestricted open source software. However, some of the most popular software on the market is either closed-source software or open-source software, but it is subject to patent restrictions. This restricted software may be easy to install and may take a long time, depending on your Li

;//Receive Form } //FORM4 when closed Private voidForm4_formclosing (Objectsender, FormClosingEventArgs e) {F3. Close ();//Form3 form Close command } }Form3 off when setting Form4 offTest canSimilarly, how to hide Form3 when FORM4 is turned on? New FORM3 (); // instantiate a FORM3 variable Public FORM4 (Form3 F3)// incoming form { initializecomponent (); = F3; // Receive form

Big talk design mode The second chapter: the strategy mode algorithm can call each other policy mode is used to encapsulate the algorithm. Big talk design mode Chapter Three: single duty principle single duty principle: In the case of a class, there should be only one cause for it to change the responsibilities of the class can not be too much, because sometimes, the completion of a duty, will affect other duties, the phone is only used to answer the phone, the camera is only used to take pictu

 From today onwards, I will publish a series of UBMTalk to you about some of the bugs that I've encountered that you may have encountered or have not yet encountered.Hope to provide some help to the latter.BUG0001 File open not closedDevelopment language:C++Phenomenon:Suddenly log can not output, (at the beginning of the log can not be written, later, the configuration file can not read, the program can do Nothing)Later in the debugging process found the following English information:Too many