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caution43. returns an array or set with zero length instead of null.44. Compile document comments for all exported API ElementsGeneral Program Design45. Minimize the scope of local variables46. for-each loop takes precedence over the traditional for loop. [for Loop Why can hate] http://justjavac.com/other/2012/05/15/whats-wrong-with-the-for-loop.html47. understand and use the class library48. If you need a precise answer, avoid using float and double

Appcompatdelegate method in this old activity and rewrite the methods of Addcontentview (), Setcontentview () in the old activity, And in these methods, callback appcompatdelegate in the corresponding method, you can add a material design-style view component for legacy activity.Reference Http://stackoverflow.com/questions/29797172/whats-the-enhancement-of-appcompatactivity-over-actionbaractivity Http://stackoverflow.com/questions/169398

greatly.There are some programmers who choose not to use any of the patterns, and some of the reasons may be that they cannot differentiate between the two patterns.。 The following are the most critical differences between the two modes: (Reference article: http://www.infragistics.com/community/blogs/todd_snyder/archive/2007/10/17/ mvc-or-mvp-pattern-whats-the-difference.aspx) MVP mode: view does not interact directly with the model , but in

character_set_results.3. emoji and utf8mb4 Emoji: mysql utf8 is not supported. You need to change it to utf8mb4. Before MYSQL 5.5, UTF8 encoding only supports 1-3 bytes, only support BMP unicode encoding area, about BMP, http://en.wikipedia.org/wiki/Mapping_of_Unicode_characters here, basically is 0000 ~ FFFF. MySQL and later versions support utf8mb4 UTF-8 encoded 4 bytes. A single character can contain up to 4 bytes. Therefore, more character sets are supported. utf8mb4 is compatible with utf8

debugging tool, supports both local and remote debugging modes and multiple advanced debugging functions. Zend Studio provides better support for the Zend Framework released by the same company than other software. New features of this version include: Support for Git and GitHub Deep integration of "Cloud" Features Create deployment package Faster startup and running speed, less disk and memory usage Of course, this version also includes some popular features in Zend Studio 8, such as

Original: Https://strongloop.com/strongblog/whats-new-in-node-js-v0-12-cluster-round-robin-load-balancingnew features of node. JS v0.12-- cluster using polling scheduling algorithm for load BalancingNovember, by Ben NoordhuisWelcome to the first of a series of blog posts authored by node's core submitter Ben Noordhuis and Bert Belder. This series may consist of 7-8 articles that cover the new features of node. js v0.12. This article is mainly about th

, look at the function declaration:function GetWindow (elem) {return Jquery.iswindow (elem)? elem:elem.nodeType = = 9 Elem.defa Ultview;}If Elem is a window, return to window directly, and if it is document, return Document.defaultview.Not quite understand why to use Document.defaultview, the small group of friends said may be multi-frame situationThen I found the post on the StackOverflow Http://stackoverflow.com/questions/9183555/whats-the-point-of

executed. I don't know how to do this step. Step 3: perform database migration operations. Migration-related documents You should first establish a database Configure data information in the common/config/main-local.php Yii is a php script. You can run php yii migrate.Execute the migration script under the console/migrations directory. At the beginning of the migration, a user table is created.The migration script content is as follows: db->driverName === 'mysql') { // ht

Performance optimizationsPerformance optimizationOriginal: https://strongloop.com/strongblog/performance-node-js-v-0-12-whats-new/January, 2014/in Community, node. js v0.12, strongnode/by Ben NoordhuisThe long development cycle of the node. JS v0.12 Version (9 months and continues, the longest so far) gives the core team and contributors ample opportunity to introduce some performance optimizations. The purpose of this blog is to cover most of the mai

:42Name\Space\fPhpdbgPHP comes with an interactive debugger phpdbg, which is an SAPI module. For more information, see phpdbg.Php: // input can be reusedphp://inputSupports multiple open and read operations, which greatly improves the memory usage of the POST data processing module.Large file upload supportYou can upload large files larger than 2 GB.GMP supports Operator OverloadingGMP objects support Operator Overloading and conversion to scalar, improving code readability, such: Added th