5 safety

Category: Baseinterskill iphone platform iphone+ platform2014-03-24 15:27 1140 People read reviews (1) favorites report directory (?) [+] Core data is an important part of iOS, which can be understood as an ORM implementation based on SQLite (or, of course, other storage, such as In-memory, which is only common to sqlite), so there are characteristics of relational databases and no need to write SQL. By the way, the official statement is that using core data can reduce the amount of code by 50%-

methodAtomic Plus Lock principle1 @property (assign, atomic) int age;2 3-(void) Setage: (int) age4 {5 6 @synchronized (self) {7 _age = Age;8 } 9}Selection of atomic and non-atomic propertiesComparison of Nonatomic and atomicAtomic: Thread-safe, requires a lot of resourcesNonatomic: Non-thread-safe, suitable for small memory mobile devicesRecommendations for iOS developmentAll properties are declared as NonatomicTry to avoid multiple th

dynamic content, theoretically the safest, but the maintenance is relatively troublesome.4, or have to constantly check their own website, is hung black chain is trivial, be hung Trojan or delete the program is very miserable, bad luck, the rankings will follow away. So remember to back up your data often.5, some directories prohibit the execution of scripts, such as uploads, static generated directory, etc.6, for the background needs to execute the

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program is running, and is the main thread of a process that is responsible for controlling the display, update, and control interaction of the UI interface. At the beginning of the Android program, a process presented a single-threaded model, with all tasks running in one thread. Therefore, we think that every function that the UI thread executes should take as short a time as possible. Other more time-consuming work (access to the network, download data, query database, etc.), should be left

Get () method returns a null value, it can indicate that the key is not in the HashMap, or that the value corresponding to the key is null. Therefore, the get () method cannot be used in HashMap to determine whether a key exists in HashMap and should be judged by the ContainsKey () method. The Hashtable key value cannot be null, otherwise: java.lang.NullPointerException.(4) Hashtable use iterator with Enumeration,hashmap.The above is only the surface of the different, their implementation is ve

1. When multiple threads access a state variable and one of the suggestions Cinderella performs a write operation, the synchronization mechanism must be used to coordinate the access of these threads to the variable. The main synchronization mechanism in Java is the keyword synchronized, which provides an exclusive locking method.2. In any case, the thread-safe class is meaningful only if the class contains only its own state.3, when more than one thread accesses a class, regardless of the runti

ConceptA class (object or method) is thread-safe when multiple threads access a class (object or method) and the class always behaves correctly.SynchronizedYou can lock on any object and method, and the lock code is called a mutex or a critical section.Codepublic class Demo1 extends Thread {private int count = 5;public void Run () {count--; System.out.println (This.currentthread (). GetName () + ", Count =" + count);} public static void Main (string[]

The following is a list of products required for level three confidentiality:1, the secret computer and mobile storage media security management System (triad system);2, Electromagnetic interference device (two-level);3, red and black power isolation socket;4, the secret computer security check software;5, storage media information elimination tool;6, CD-ROM recording monitoring and auditing system;7, network security audit system;8, print security mo

improve the processing ability of the whole system by improving the computing ability of the single node, just like the diesel locomotive can not increase to 200 km/h at the same time. Distributed computing technology provides a firm material base for the Big data security analysis platform.MassiveBased on the "Harmony number" EMU and its integrated system, China's high-speed railway has realized the bus and high-speed operation, realized the operation efficiency of

The story was told by the victim on the bus. Today, I went back to school after completing the formalities at home. It was too far for me to take the train, so I chose the Security Department. A small number of high passengers (the train can be used in the future as much as possible) Come back, because the distance is far, so the bus travel To a certain bus service center (some are not formal, everyone knows), let the passengers rest and so on, the driver master also off In order to ensure

://opensso.dev.java.net) Architecture Guide. 5 functionality and performance limitations of the current scenario in addition to security, the current scenario requires a lot of improvements in both functionality and performance: The login authentication mode currently provided is only one: username and password, and in order to be simple, put the username and password in memory. In fact, the source of user identity information should be a vari

game, to induce users to click on an area, submit information.2.4 URL Jump VulnerabilityJump to a malicious website using a website that the user trusts.For example, after a seemingly common URL link, add a malicious linkHttp://mail.qq.com/......url=http://black.comNow many malicious links can be further disguised as short links in the form of t.cn/black, more confusing.Check the page source code, find the Jump link url.php?url= ...Several ways to jump:Header: Header ("Location:". $target);Js:M

Software information (Figure: 1) 367 security guard is the first domestic free network security software that was born in June 2008. 367 security guards in less than two months time rapid growth for domestic users of the first network security software, covering nearly 50% of the Internet users, by the majority of netizens love. June 6, 2008, 367 security shield to switch the new domain name www.367safe.cn, completed from the product to the safety

, Google (link not on the students themselves to solve OH ~) to inquire about the site informationor a dedicated Whios query site, recommend Toolbar.netcraft.com/site_report, or record-searching siteThis is to use multi-mode query, multi-collection Web container, Os,email ... This information is useful to social workers.4. Collecting Web Container informationIis,apache,tomcat,nginx on the web to find out if there is a corresponding version of the exploit code.

The setting method of direct safety shutdown of notebook computer WIN8 system by Power key: 1, the right mouse click on the lower left corner of the computer desktop "Start" button; 2, right click on the "Start" button after the pop-up menu, click to select "Power Options"; 3, in the "Power Options" interface, click the "Select the function of the power button" option; 4, click the "Select the function of the power button" opt

In Java, there are 2 ways to use the Synchronized keyword: As a keyword decoration method Retouch a block of code [TOC]Thread contentionTo explore the specific use of synchronized, you can use a simple procedure to illustrate:Package fc.learn.java.synchronize;import Java.util.Random; Public classlearningsynchronized { Public enumSynctypetag {obj_method, Class_method, Keyward_method, Normal_method}Static classMyrunnableImplementsrunnable{Private void Counting(){ for(inti =0; i5;

SimpleDateFormat is a common class in Java that is used to parse and format date strings, but it can cause very subtle and difficult-to-debug problems if you use carelessness.Because the DateFormat and SimpleDateFormat classes are not thread-safe, calling the format () and Parse () methods in a multithreaded environment should use synchronous code to avoid problems.Or you can use threadlocal to turn shared variables into exclusive, and thread-exclusive will definitely be able to reduce the overh

360 Safety Guardian Pilot Edition skin How to make? Following the October 24, 2014 360 security guards launched 10.0beta, launched 360 security Guardian pilot version, the pilot version of the skin is added to the custom function, so that users choose their favorite pictures as skin, the following PC software download Station small set for you to introduce the pilot version of personalized skin How to configure it ! How-to Tutorials For example, how

Imitation Millet Safety Center detection effect Cut the crap, let's go ahead. Effect Chart: GitHub Address: Https://github.com/niniloveyou/GradeProgressView This effect of the use of the scene is not much, mainly a variety of testing time, such as Garbage clean-up, mobile phone security detection, of course, if you do not want to avoid this effect is ugly, can also be used as a progress bar. Ha ha. Here are some dry-goods analysis of how this ef