r in nutshell

New UI DesignIOS7 The biggest change is the UI design, perhaps you will say UI design "This is the designer should pay attention to things, not the developers, we just need to replace the image." Then you are wrong. Changes in the UI will inevitably bring about changes in usage habits and patterns, how to use the IOS7 UI, and how to make your application more relevant to the new system, which is something to consider. It's also worth noting that apps packaged with the IOS7 SDK (now available onl

seed, which is illustrated here directly with the code example:at the time of the definition of the same seed, respectively, using R1 and R2 to go to [0,30) random number, the results of compilation execution regret found that the results are presented AABB type, indicating that R1 and R2 take the random number is identical (for the experiment). If I change the code, change it to the following:after compiling the output, we will no longer get the result of the AABB type, according to the differ

analogy, JSON is used by the underground to write and exchange information "code", and Jsonp is the message written with the signal to his comrades using the connection method. Did you see that? One is the format of describing information, and the other is the method agreed by both parties to the information delivery.Since we are talking casually, we are not going to use dogma to tell, but focus on helping developers understand whether they should choose to use and how to use them.

This article introduces the principles of Java memory allocation in more detail to help beginners learn Java more easily. There are many such articles online, but most of them are rather fragmented. From the cognitive process point of view, this paper will bring the reader a systematic introduction.The first thing to know before you get to the point is that the Java program runs on the JVM (Java Virtual Machine,java VM), which can be understood as a bridge between Java programs and operating sys

Angularjs in the application of a wide range of applications, mainly allows us to access different content through different URLs, can implement multi-view single-page Web application. below to see how to use. About RoutingUsually our URL form is http://jtjds.cn/first/page, but in a single page Web application Angularjs through the #+ tag implementation, such as the following page, will be the routing example below.http://192.168.1.109:8000/angular-program/src/main.html#/pagetable/page1http://

conform to today's standard practices. As a result, although C + + is found to be less applicable, Java is designed to be as close to C + + as possible to make the system easier to understand. Java rejects many features that are seldom used, incomprehensible, and confusing in C + +. Indeed, Java syntax is a "pure" version of the C + + syntax.The other aspect of simplicity is small. One of the goals of Java is to support the development of software that can run independently on small machines. A

(Infoqchina) every morning will be pushed to send an article, Great depth is worth learning to improve yourself every day.(https://www. zhihu.com) can say that the community is full of programmers, perhaps you have a problem with the programming learning route, perhaps you want to find some information, the community can be completely satisfied with you. All kinds of programmer problems only you can not imagine, no you can not find.(http://www. jikexueyuan.com) (http://www. imooc.com) If you

. When the program needs to expand, can not modify the original code, to achieve a hot plug effect. So a nutshell is: In order to make the program good extensibility, easy to maintain and upgrade. To achieve this, we need to use interfaces and abstract classes, which we will refer to later in the specific design.2. The principle of substitution on the Richter scale (Liskov Substitution Principle)One of the fundamental principles of object-oriented des

your computer only needs to know the MAC address of host ' "To send the" this data in its ". If you recall the Media Access Control address is a physical layer function then addresses actual physical hardware on you R computer. In a nutshell, the It works like the IP address, only on your local network.Arp!To perform this feat, your computer sends out a broadcast message to everyone on the network called an ARP, or Address Res Olution Protocol. It '

, here no longer repeat, mainly about the ADC.How to measure the quality of an ADC? In a nutshell, look at two parameters: sample speed and quantization bit. What is the sampling speed and quantization bit number? As you can see, the sampling speed represents the speed, and the quantization number represents the precision. Both of these values are bigger and better.So, how do you know the "sample speed" and "quantization bit" of the ADC in your phone?

Some time ago, and the company's an Android programmer to develop a simple app, because the first write, time is also tense, the total feeling of writing is not so perfect, take advantage of this period of time to summarize the experience. For app requests, the type of data returned by the server is typically JSON and XML. The difference between XML and JSON: The readability aspect--xml is superior. Because it is made up of a number of nodes, the name of the node can be customized.

best-known or preferred solution so far is to use JSON to spread data across domains by JSONP. And that's what this article is going to tell you.JSON and JSONP Although there is only one letter difference, but actually they are not the same thing: JSON is a data interchange format, and Jsonp is a kind of unofficial cross-domain data interaction protocol that relies on the ingenuity of developers. We use the latest spy war film to make an analogy, JSON is used by the underground to write and exc

the requirements of monotonicity.The principle of consistent Hashing consistent hashConsistent hashing is a hash algorithm, in a nutshell, when removing/adding a cache, it can change the existing key mappings as small as possible, and satisfy the monotonic requirements as much as necessary.1. Ring Hash SpaceConsider that the usual hash algorithm is to map value to a key value of 32, which is the value space of the 0~2^32-1; we can think of this space

relatively simple, divided into 4 steps: Receive proof of purchase from the iOS side. Determine if the credential already exists or has been validated, and then store the voucher. Send the credential to Apple's server for authentication and return the validation results to the client. If necessary, modify the user's corresponding member permissions. Given the network anomalies, the server's authentication should be a recoverable queue and should be retried if the netwo

in the instance first, find it in the prototype, and then search for the top-level prototype. All the way to the end of the prototype chain is to return a undefined if the null has not been found. When we enter P1.home[0], is also the same search mechanism, first search P1 see there is a property called home and methods, and then step up to find. Finally we found it in the prototype of mother, so modifying him would be equivalent to modifying the mother prototype.In a

1 //Understanding Cookies: A mechanism for storing data to track users and identify users in a customer-service browser2 //In a nutshell, a cookie is a file that the Web server temporarily stores on the user's hard drive and is then read by the Web browser, and when the user sends the Web site again, the specific information is recorded by reading the cookie file, which quickly makes the corresponding , the user does not need to enter the user's ID an

container are called beans. In a nutshell, beans are the objects that are initialized, assembled, and managed by the spring container, and there is nothing special about beans. The bean definition and the dependencies between the beans are described by configuration metadata.Spring's IOC containerOrg.springframework.beans.factory.BeanFactory is the actual representative of the spring IOC container, the IOC container is responsible for holding the bea

insert a connection point for enhanced processing. In a nutshell, when a connection point satisfies a specified requirement, the connection point is added with enhanced processing, which becomes a pointcut. Spring's AOP supportThe AOP agent in spring is generated and managed by the spring IOC container, and its dependencies are managed by the IOC container.To use support in your app @AspectJ , Spring needs to add three libraries: aspect

?" ”。 Instantaneous misfiring, of course you can say JS that simple words, do not need to know what data type, can also write full screen swirling. But the details determine success or failure, the landlord can not say, the offer may also fly. What are the data types of JavaScript, in a nutshell:　　The numeric type has only one (number), the string is not true (Boolean) that must be kept, null (NULL) plus undefined (undefined) is also commonly used, ar

elements needs to be maintained, so performance is slightly lower than hashset.TreeSet: The data structure of the red-black tree is used to store the collection elements and supports two sorting methods, natural sorting and custom ordering. Note: When using TreeSet, the added objects are guaranteed to implement the comparable interface, otherwise the failure is added and a Classcastexecption exception is thrown. In a nutshell, if you want TreeSet to