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Best way to concatenate List of String objects? [duplicate]

...If you are developing for Android, there is TextUtils.join provided by the SDK. share | improve this answer | follow | ...
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How to draw border around a UILabel?

... they're available only starting SDK 3.0 :( If you want just a quick solution for debugging purpose you can set semitransparent colored background for your label. – Vladimir Feb 22 '10 at 15:22 ...
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Redis 的性能幻想与残酷现实 - 更多技术 - 清泛网 - 专注C/C++及内核技术

...验室环境的测试结果接近,而目前生产环境使用的 Redis 版本已升级到 2.8 了。如果业务量峰值继续增高,看起来单个 Redis 分片还有大约 20% 的余量就到单实例极限了。那么可行的办法就是继续增加分片的数量来分摊单个分片的压...
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How to increment a NSNumber

...anyone who is using the latest version of Xcode (writing this as of 4.4.1, SDK 5.1), with the use of object literals, you can clean the code up even a little bit more... NSNumber *x = @(1); x = @([x intValue] + 1); // x = 2 Still kind of a pain to deal with the boxing and unboxing everything to d...
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How to show the loading indicator in the top status bar

...hen they are accessing the network. Is there a way to do the same thing in SDK apps, or is this an Apple only thing? 8 Answ...
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界面布局组件 · App Inventor 2 中文网

...望组件一个一个地显示,请使用 垂直滚动条布局。 这个版本是可滚动的。 属性 水平对齐 一个数字,用于表示水平滚动条布局的内容如何水平对齐。选择分别是: 1 (左对齐) 2 (右对齐) 3 (水平居中) ...
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开源邮件传输代理软件 -- Postfix 介绍 - 开源 & Github - 清泛网 - 专注C/C++及内核技术

...命令,如流行的本地投递代理procmail。在流行的linux发行版本RedHat中,我们就使用procmail作为最终的本地投递代理。 远程投递代理SMTP进程根据收件人地址查询一个SMTP服务器列表,按照顺序连接每一个SMTP服务器,根据性能对该表...
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How to check if current thread is not main thread

... the solutions, I think that's the best one: boolean isUiThread = VERSION.SDK_INT >= VERSION_CODES.M ? Looper.getMainLooper().isCurrentThread() : Thread.currentThread() == Looper.getMainLooper().getThread(); And, if you wish to run something on the UI thread, you can use this: new Ha...
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Unable to locate tools.jar

... Install the Java SDK. Add a System Environment Variable called JAVA_HOME with the value of JDK location. Go to Control Panel\System and Security\System. Advanced System Settings, Environment Variables, System Variables, New... Example: Vari...
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Android代码优化小技巧 - 更多技术 - 清泛网 - 专注C/C++及内核技术

...分配内存 代码的执行效果会受到设备CPU,设备内存,系统版本等诸多因素的影响。为了确保代码能够在不同设备上都运行良好,需要最大化代码的效率。 避免创建不必要的对象 虽然GC可以回收不用的对象,可是为这些对象分配...