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随谈 Java 的空指针 翻译和整理. 整理自 http:/ www.yegor256.com/2014/05/13/why-null-is-bad.html. 在日常编码中,有个经典的 Java 空指针 NULL 调用如下. Public Employee getByName(String name) { int id = database.find(name); if (id = 0) { return null; } return new Employee(id); }. 那么这段方法有什么问题 这个方法的最大问题就是有可能会返回 NULL 对象。 向全世界道歉, 忏悔他曾经发明了 空指针 这个玩意. I call it my billion-dollar mistake. It was the invention of the null reference in 1965. I couldn’t resist the temptation to put in a null reference, simply because it was so easy to implement. Joiner ...

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無標題文檔 | gracecode.com Reviews
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随谈 Java 的空指针 翻译和整理. 整理自 http:/ www.yegor256.com/2014/05/13/why-null-is-bad.html. 在日常编码中,有个经典的 Java 空指针 NULL 调用如下. Public Employee getByName(String name) { int id = database.find(name); if (id = 0) { return null; } return new Employee(id); }. 那么这段方法有什么问题 这个方法的最大问题就是有可能会返回 NULL 对象。 向全世界道歉, 忏悔他曾经发明了 空指针 这个玩意. I call it my billion-dollar mistake. It was the invention of the null reference in 1965. I couldn’t resist the temptation to put in a null reference, simply because it was so easy to implement. Joiner ...
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無標題文檔,null,甚至 tony hoare,对许多程序员来说,早就已经习惯了空指针的存在,就像日常生活中的空气和水一样,那么,空指针究竟有什么问题,额外的错处处理,那么这样的话就会多了额外的流程去处理因为空指针判断而多加的判断,加入空指针判断以后,程序往往会有额外以及复杂的逻辑判断,语义不清晰,上面的问题自然可以规避,例如在,getbyname,这个方法中加入异常的判断,那么重新命名这个方法的名字为,getbynameornullifnotfound,那么这里又会引申出另外一个问题,就是性能
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随谈 Java 的空指针 翻译和整理. 整理自 http:/ www.yegor256.com/2014/05/13/why-null-is-bad.html. 在日常编码中,有个经典的 Java 空指针 NULL 调用如下. Public Employee getByName(String name) { int id = database.find(name); if (id = 0) { return null; } return new Employee(id); }. 那么这段方法有什么问题 这个方法的最大问题就是有可能会返回 NULL 对象。 向全世界道歉, 忏悔他曾经发明了 空指针 这个玩意. I call it my billion-dollar mistake. It was the invention of the null reference in 1965. I couldn’t resist the temptation to put in a null reference, simply because it was so easy to implement. Joiner ...

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想想还是再写写魅族吧,一来我用了曾经也是 煤油 二来我 普通发 要稍稍好过他们一点,要真吵起来我可能会比他们说得更多一点。 我们经常会遇到这样的产品经理设计师,他们总是会想些相对常人无法理解的功能和元素,试图来 说服 自己和 打动 用户。 这帮设计师和产品经理当然不可能自己打自己的脸,说我们下台手机将不支持 SmartBar 啦 所以他们给用户在设置里多了一个选项 自动隐藏 SmartBar 自 Flyme 3.7.7 版本起。 当然,这个选项是 Flyme4 的新特性,纳入到 Change Log 里面的。 好吧,总是拿 SmartBar 说事显得不是很人道,人家很努力的不是吗 那么我们再来说一件事情,那就是 Ubuntu OS。 相信很多手持 MX3 在 多年 以前就已经期待这个系统了吧,说实话当时我也震惊了下。 最后的结果是将近两年过去了,魅族的 Ubuntu OS 手机终于出来的,而 MX3 却被无情的抛弃了。 不仅仅是 Ubuntu OS,甚至引入了阿里的 YunOS,这点叫 引狼入室 一点也不为过。 现在我会一个巴掌过去,拍醒这位 爱国者 买什么国产手机 没事干给自己添堵呢.

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距离 T1 发布已经有一年多的时间了,但是锤子二代 T2 手机却丝毫没有风声。 就在上周锤子至少还是发布了一款产品的,那就是 锤子日历 - 一款 iOS 平台的日历应用。 目前在 AppStore 上面有它的几款相对不是很 大 的应用 锤子便签、锤子时钟、锤子日历以及对应的同步工具。 锤子迟迟的没有发布 T2 手机 应该就叫这个名字了 ,却在 iOS 平台上发力开发这些应用的逻辑是什么. 这些应用几乎都应该是一个 正常系统 必须要安装的 便签、时钟、日历等等。 对应的 iOS 系统,他们自家的 Smartian OS 也有一模一样的应用,甚至连界面都可以说是非常的一致。 同时,在 iPhone 的使用用户当中,将 iPhone 用作生产力工具的用户会有很强的粘度以及使用惯性。 很少有手机拿到手打开有那么让人会心一笑的感觉了,iPhone4 算一个、锤子的 T1 也可以算一个。 光是针对 讨好 iOS 用户以及和其他 Android 手机 不跟随 的界面往往是不够的,同时当然锤子自己也想做得更多。 Laquo; 对于 ThinkPad 的那点情怀. 迁移到了 Digital Ocean 的新加坡节点.

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LED 灯 x2 16RMB. Laquo; WiFi-Duino 使用小结. 嗨 我叫 明城 ,八零后、技术男、伪苹果粉、微软无脑黑、宁波佬,现居杭州。 Echo bHVja3lAZ3JhY2Vjb2RlLmNvbQo= base64 - decode. 迁移到了 Digital Ocean 的新加坡节点. 2007 - 2016 無標題文檔 (RSS订阅).

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迁移到了 Digital Ocean 的新加坡节点. 只是,有点讨厌的就是他们的销售时不时的会打电话来,提醒我不是带宽被沾满了就是服务器的 CPU 过载了,其实在我看来就是铁了心的让我缴费升级 VPS 的配置,而我的那台机子上放置的也仅仅是几个 Blog 程序而已。 所以为了避免麻烦和骚扰,加之 美团云 的主机三月份就到期,于是更换 VPS 的念头就起来了。 选择来选择去,其实符合我要求的 VPS 其实没几家,剩下的无非就是 Linode、MediaTemplate 还有就是 Digital Ocean. 偏偏是我选择 新加坡 节点以后获得的,就目前测试的情况来看,Digital Ocean 的新加坡节点喜忧参半 喜的是联通和教育网访问 新加坡 节点似乎是通过日本访问,所以比较快速,而惨的就是国内的电信新路就哀鸿遍野了。 Laquo; 升级和改造 NAS 小记. 嗨 我叫 明城 ,八零后、技术男、伪苹果粉、微软无脑黑、宁波佬,现居杭州。 Echo bHVja3lAZ3JhY2Vjb2RlLmNvbQo= base64 - decode. 迁移到了 Digital Ocean 的新加坡节点.

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Http:/ www.iwatch365.com/thread-17184516-1-1.html. Http:/ post.smzdm.com/p/224298/. Laquo; Android 开发的昨天、今天和明天. 嗨 我叫 明城 ,八零后、技术男、伪苹果粉、微软无脑黑、宁波佬,现居杭州。 Echo bHVja3lAZ3JhY2Vjb2RlLmNvbQo= base64 - decode. 迁移到了 Digital Ocean 的新加坡节点. 2007 - 2016 無標題文檔 (RSS订阅).

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属性列表类包括 NSArray, NSDictionary, NSString, NSNumber, NSDate,NSData以及他们的变体. 集合属性列表类具有 writeToFile atomically 方法,用于将属性列表写入文件. NSString、NSData也具有 writeToFile atomically 方法,但只写入字符串或数据块. Void) encodeWithCoder:(NSCoder *) aCoder;. Id) initWithCoder:(NSCoder *) aDecoder;. Predicate = [NSPredicate predicateWithFormat: @name = Herbie];. BOOL match = [predicate evaluateWithObject: car];. NSLog (@%s, (match)? YES : NO);. Predicate = [NSPredicate predicateWithFormat: @engine.horsepower 150];. NSLog (@%@, car.name);.

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于 三月 1, 2011. 今天跟随玉伯搬家到heiniuhaha.wordpress.com,不用担心域名,不用担心服务器,不用担心update wordpress后blog崩溃,希望能结束这种忧心的日子,只关注blog的内容,安安心心写东西,舒舒服服学东西。 速度没有之前独立域名的快,因为服务器是在国外,也有被墙的隐患,不过没有关系,咱还是会红杏出墙的. Wordpress官方提供的blog服务,服务器会比较稳定,更新比较容易,域名和空间免费,数据不容易丢失. Larr; 崩溃,我的备案号突然被注销了. One response to “. 三月 1, 2011 06:10. Hi, this is a comment. To delete a comment, just log in, and view the posts’ comments, there you will have the option to edit or delete them. Fill in your details below or click an icon to log in:.

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Focus on web frontend. Def is prime(n): if n 2: return False for i in range(3, n): if n % i = 0: return False else: return True. A HackerNews-like site dedicated to JavaScript and Front-end News. Posts, tutorials, case study and demos. Nicholas C. Zakas. The best of the best. It is the prime source for browser compatibility information on the Internet. 2014 Coding,Changing - Theme By : OopThemes.

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seajs combo插件之express版本 | Coding,Changing

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Focus on web frontend. 地址 https:/ www.npmjs.org/package/express-combo-seajs. Var combo = require('express-combo-seajs'); app.use(combo( dirname, "public") ;. A HackerNews-like site dedicated to JavaScript and Front-end News. Posts, tutorials, case study and demos. Nicholas C. Zakas. The best of the best. It is the prime source for browser compatibility information on the Internet. 2014 Coding,Changing - Theme By : OopThemes.

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python 检查是否是素数 | Coding,Changing

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Focus on web frontend. Def is prime(n): if n 2: return False for i in range(3, n): if n % i = 0: return False else: return True. Nodejs in action 读书笔记—异步流程控制. Javascript 数字类型跟点号 →. A HackerNews-like site dedicated to JavaScript and Front-end News. Posts, tutorials, case study and demos. Nicholas C. Zakas. The best of the best. It is the prime source for browser compatibility information on the Internet. 2014 Coding,Changing - Theme By : OopThemes.

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使用vagrant 创建并配置轻量级、可复用 、便携的开发环境 | Coding,Changing

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Focus on web frontend. Vagrant box add {title} {url} $ vagrant init {title} $ vagrant up. 官网 http:/ docs.vagrantup.com/v2/why-vagrant/index.html. Nodejs in action 读书笔记—异步流程控制 →. A HackerNews-like site dedicated to JavaScript and Front-end News. Posts, tutorials, case study and demos. Nicholas C. Zakas. The best of the best. It is the prime source for browser compatibility information on the Internet. 2013 Coding,Changing - Theme By : OopThemes.

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Focus on web frontend. A HackerNews-like site dedicated to JavaScript and Front-end News. Posts, tutorials, case study and demos. Nicholas C. Zakas. The best of the best. It is the prime source for browser compatibility information on the Internet. 2014 Coding,Changing - Theme By : OopThemes.

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Promise的历史 | Coding,Changing

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Focus on web frontend. 当Dojo框架从Twisted中发现了Promise,并且添加了一个叫dojo.Defrred的对象,Promise 赶上了2007年,javascript的主流。 在2009年,受dojo.Deferred的影响,Kris Zyp 提出CommonJs的 Promises/A(http:/ wiki.commonjs.org/wiki/Promises/A). 然而,在2010年2月,Ryan Dahl 做了个决定,又把他转成熟悉的 callback(err, results)形式,他认为Promises是一个高层次的结构,应该让用户自己处理。 这个决定为Node中,正在竞争的实现Promises的框架让路了,比如,著名的 Kris Kowal的Q.JS和AJ ONeal的Futures。 通常使用中,Promise,Deferred,跟Future 这个几个术语都差不多一个意思。 翻译自 async javascript 第三章. 2014年05月21日 at 4:39 下午. 2014年06月19日 at 5:47 下午.

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