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变声器 · App Inventor 2 中文网
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起始工程：变声器.aia
Blocks 文件：变声器.asc
安装 AI2 Companion，并用“连接”菜单把手机接到 App Inventor。首次测试语音识别和文本朗...
Why does Apple recommend to use dispatch_once for implementing the singleton pattern under ARC?
...ync() is synchronous). The use of dispatch_once() replaces the following idiom:
+ (MyClass *)sharedInstance {
static MyClass *sharedInstance;
@synchronized(self) {
if (sharedInstance == nil) {
sharedInstance = [[MyClass alloc] init];
}
}
return sharedInst...
记一次MongoDB性能问题 - 大数据 & AI - 清泛网 - 专注C/C++及内核技术
...avoid performance problems: numactl –interleave=all mongod [other options]
当时我并不太清楚NUMA是什么东西，所以没有处理，只是把问题反馈给了运维人员，后来知道运维人员也没有理会这茬儿，所以问题的序幕就这样拉开了。
迁移工作...
“Could not find bundler” error
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if you create a new applocation - rails new and if you get this error?
– AMIC MING
Mar 19 '13 at 0:35
2
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bundle install returns “Could not locate Gemfile”
...o the gemfile in the same command e.g.
BUNDLE_GEMFILE="MyProject/Gemfile.ios" bundle install
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How do I do a HTTP GET in Java? [duplicate]
...you want to stream any webpage, you can use the method below.
import java.io.*;
import java.net.*;
public class c {
public static String getHTML(String urlToRead) throws Exception {
StringBuilder result = new StringBuilder();
URL url = new URL(urlToRead);
HttpURLConnection co...
How to store printStackTrace into a string [duplicate]
...eturn errors.toString();
Ought to be what you need.
Relevant documentation:
StringWriter
PrintWriter
Throwable
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Convert JSON String to JSON Object c#
...json = JObject.Parse(str);
You might want to refer to Json.NET documentation.
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What is Mocking?
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Prologue: If you look up the noun mock in the dictionary you will find that one of the definitions of the word is something made as an imitation.
Mocking is primarily used in unit testing. An object under test may
have dependencies on other (complex) objects. To isolate the...
Java内存泄露原因详解 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...机会。
4、各种连接
比如数据库连接（dataSourse.getConnection()），网络连接(socket)和io连接，除非其显式的调用了其close（）方法将其连接关闭，否则是不会自动被GC 回收的。对于Resultset 和Statement 对象可以不进行显式回收，但Conne...