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Path to Architect (7)-opening and closing principle of OOD

2. open-closed principle (OCP) 2.1 What is the principle of open/closedThe principle of opening/closing is the cornerstone of "reusable design" in Object-Oriented Design and one of the most important principles in object-oriented design. Many other design principles are a means to achieve the principle of opening/closing. In 1988, Bertrand Meyer proposed the open and closed principle in his book object

How to download images in PHP, instead of opening-php Tutorial

How does PHP download images instead of opening them! Example: PHP nbsp; how can I download a specified image? Instead of opening it in a browser? PHP Image Download PHP how to download images instead of opening them! Example: How does PHP download specified images? Instead of opening it in a browser? PHP image down

Detects if the user is opening the app for the first time

Very often we need to detect if the user is opening the app for the first time, initializing some data, or opening the boot interface, and so on./* Method One: * First open when get Isfirstin value, default value is False * get false, prove not first open * get true, prove to be first opened; then set isfirstin value to False * */ Sharedpreferences sp = getsharedpreferences ("Isfirstin", activity.mode_priva

7 great cheats to increase your website's opening speed

effect would be? Its principle is to obtain the picture path through the way of CSS coordinates, each CSS tag refers to the different coordinates to obtain the different picture. We see a lot of web site CSS pictures only one, with this principle.Do not understand also has no relationship, CSS image Merge generator This site can help you to merge CSS images, and can get the corresponding code.5: Basic script to load only This is the simplest, do not spend time, click on their own site right-cli

NHibernate Tutorial (1)--a good opening

NHibernate Tour (1): The opening is goodThe content of this section What is NHibernate? Architecture of the NHibernate NHibernate Resources Welcome to join NHibernate Chinese community Author Note: 2009-11-06 updatedNHibernate opening is beneficialLearning nhibernate for some time, intends to do a phased summary, on the initiation of this series, this series of reference NHibernate

Slow solution for Web page opening

The slow opening of the Web page is a frequent problem when surfing the internet, for a lot of reasons. Here is a brief introduction to the reasons for the slow Web page and solutions. The factors that affect the speed of page opening are as follows: 1, the network firewall settings do not allow multi-threaded access, such as the current WinXPSP2 on this default to do the restrictions, the use of multi-th

Port opening is dangerous. Common port resolution

in a variety of network services.Port Description: port 111 is the port opened by SUN's Remote Procedure Call service. It is mainly used for internal process communication between different computers in a distributed system, RPC is an important component in a variety of network services. Common RPC services include rpc. mountd, NFS, rpc. statd, rpc. csmd, rpc. ttybd, and amd. The RPC service is also available in Microsoft Windows.Port vulnerability: a major vulnerability in sun rpc is the remot

During the opening ceremony of Pyeongchang Winter Olympics, it was attacked by hackers.

During the opening ceremony of Pyeongchang Winter Olympics, it was attacked by hackers. At the opening ceremony of the Pyeongchang Winter Olympics, the organizer found that there was a suspicious activity in its system. Later, they confirmed that this was caused by a hacker attack. The Pyeongchang Winter Olympics Organizing Committee said that during the opening

Asp.net hyperlink to download the TEXT file, instead of directly opening it in IE, asp. nettext

Asp.net hyperlink to download the TEXT file, instead of directly opening it in IE, asp. nettext Problem description: a text file is generated in the background and provided to the user for download through a hyperlink. Click the hyperlink to download the Excel file. However, the text file will be opened directly, rather than the download window will pop up. Solution: Change HyperLink to LinkButton. In the Click event, use a file stream to write text f

How to adjust the file opening mode in Linux

Article Title: how to adjust the file opening mode in Linux. Linux is a technology channel of the IT lab in China. Including desktop applications, Linux system management, kernel research, embedded systems and open source, and other basic categories in Gnome's file manager (nautilus), double-click a file, the system automatically calls the corresponding program to open the file. In Nautilus, you can modify the default open mode by right-clicking the m

Fixed the default opening mode of Shell scripts in Ubuntu.

terminal. I know that this is feasible, but isn't it an excuse that it cannot run in the GUI? In this tutorial, we will seeHow to run the shell script after double-clicking. Fixed the problem of opening shell scripts in Ubuntu with a text editor. The reason why shell scripts are opened in the file editor is the default behavior settings in Files (File Manager in Ubuntu. In earlier versions, it may ask if you want to run the file or open it in the edi

How can I limit the maximum number of processes and maximum file handle opening in Linux?

This article shares with you the main Linux the maximum number of processes and the maximum file handle opening limit is lifted related content, come together to look at it, hope to everyone Learning Linux helpful. Ulimit Resources used by the shell startup process1. Syntax format: ulimit [-ACDFHLMNPSSTVW] [size]2, Parameter introduction :-H Sets the hardware resource limit .-S sets the software resource limit .-a displays all current resource limi

VC: file operations, including opening, saving, copying, deleting, and searching

Various file operations are very common in program design. If you know all these operations well, you can find the best solution based on the actual situation, this allows you to write efficient code in a short period of time. This article provides a comprehensive introduction to file operations in Visual C ++, and analyzes in detail some difficult problems that are frequently encountered in file operations. 1. File Search When operating on a file, if you do not know whether the file exists, you

Differences between opening a file in C language and binary mode

mode, you need to press enter and wrap two characters into one character, it is equivalent to truncating the file. But why is it just possible? Because there may not be two consecutive bytes 45 and 42 in the text (45 is the ASCII code of Cr carriage return, 42 is the ASCII code of CL line break), there will be no "truncation" operation, therefore, the content is the same. Specifically, it is best to read a file (written in text format) in text format. Binary files (written in binary mode), pref

Open interfaces and hide details-the principle of opening and closing based on the basic object-oriented principles

Open interfaces and hide details-the principle of opening and closing based on the basic object-oriented principles We know that the code we have written has undergone multiple tests. For example, you need to pass unit testing and integration testing by developers, then go to White-box testing and black-box testing by testers, and finally perform certain tests by users. After a long test, the code can be put into use. However, maintenance and upgrade

Open Roboframework Report in Jenkins: Opening Robot Framework reports failed

Opening Robot Framework Report failedVerify. You has JavaScript enabled in your browser.Make sure is using a modern enough browser. Firefox 3.5, IE 8, or equivalent is required, newer browsers is recommended.Check is there messages in your browser ' s JavaScript error log. Please be problem if you suspect a bug with encountered a.Solution 1:First in the browser run add this code HTML file If you can play the description is not browser support JS prob

Website user experience research: New window opening link or current window playing

the website is opened in a new window, you may open more than 10 or even 20. If you do not close it in time, the number of IIS connections will peak, later viewers will not be able to access the website, resulting in temporary paralysis of the website. Open the current window: Advantages: 1) opening a website in only one window will greatly reduce the overhead of our website server, and the website cannot be opened, unless there are too many online u

[Android development Note] returns the correct opening method of the Upper-layer Activity, androidactivity

[Android development Note] returns the correct opening method of the Upper-layer Activity, androidactivity Technology support http://stackoverflow.com/questions/12276027/how-can-i-return-to-a-parent-activity-correctly First, we can see someone writing this on the Internet: 1 @Override 2 public boolean onOptionsItemSelected(MenuItem item) { 3 switch (item.getItemId()) { 4 case android.R.id.home: 5 this.getActiv

Missing filename opening checkpoint file., openingcheckpoint

Missing filename opening checkpoint file., openingcheckpointGGSCI (hosta) 48> view report dpfull**************************************** *******************************Oracle GoldenGate Capture for OracleVersion 11.2.1.0.27 19591627 OGGCORE_11.2.1.0.0OGGBP_PLATFORMS_141006.1156_FBOLinux, x64, 64bit (optimized), Oracle 11g on Oct 6 2014 16:57:47Copyright (C) 1995,201 4, Oracle and/or its affiliates. All rights reserved.Starting at 22:14:12*************

Opening a new form with a script cannot access the session

This is a headache. You cannot access the page after opening the form to display the page. Session Value. It may be IIS The service treats the new form as a new connection and reallocates it. Session Session. In this case, a special form opening method is used, and the project is hit. Opening a form in case of a problem : First Showmodaldialog A mode for

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