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Which @NotNull Java annotation should I use?
I'm looking to make my code more readable as well as use tooling like IDE code inspection and/or static code analysis (FindBugs and Sonar) to avoid NullPointerExceptions. Many of the tools seem incompatible with each others' @NotNull / @NonNull / @Nonnull annotation and listing all of them in my ...
使用App Inventor 2 控制物联网设备/低功耗蓝牙设备(BLE) · App Inventor 2 中文网
...备。 相反，当外围设备之一连接到主设备时，外围设备无法相互通信。 外设必须具有低功耗，因为它们必须长时间不活动[10]。
建立连接后，智能手机和外围设备将开始根据通用属性配置文件 (GATT) 交换数据。 这是一个发送和...
In a PHP project, what patterns exist to store, access and organize helper objects? [closed]
How do you organize and manage your helper objects like the database engine, user notification, error handling and so on in a PHP based, object oriented project?
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移动前端开发之viewport的深入理解 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...通过window.innerWidth 来获取，但在Android 2, Oprea mini 和 UC 8中无法正确获取。
现在我们已经有两个viewport了：layout viewport 和 visual viewport。但浏览器觉得还不够，因为现在越来越多的网站都会为移动设备进行单独的设计，所...
What is the motivation for bringing Symbols to ES6?
As you may know they are planning to include new Symbol primitive type in ECMAScript 6 (not to mention some other crazy stuff). I always thought that the :symbol notion in Ruby is needless; we could easily use plain strings instead, like we do in JavaScript. And now they decide to complicate thi...
How to access the correct `this` inside a callback?
I have a constructor function which registers an event handler:
11 Answers
11
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Set up DNS based URL forwarding in Amazon Route53 [closed]
I'm trying to setup forwarding in Amazon Route53. My last DNS service (Nettica) allowed me to route requests to "aws.example.com" to "https://myaccount.signin.aws.amazon.com/console/".
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如何建立一套适合自己的高胜算交易系统 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...的首要条件。如果，一套很好的交易系统，但心态急噪，无法忍耐空仓或者视那些持续飚升但不知道如何控制风险才为合理而又强行介入，那么，作为脱离交易系统控制，导致的失败，就不能归咎于交易系统程序失败，是心态失...
Swift and mutating struct
There is something that I don't entirely understand when it comes to mutating value types in Swift.
7 Answers
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只有程序员能看懂的笑话 - 轻松一刻 - 清泛网 - 专注C/C++及内核技术
...这人回答说：“如果是我的团队写的这个软件，飞机根本无法起飞，根本谈不上坠毁。
程序员 笑话