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Concatenating null strings in Java [duplicate]
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This is behavior specified in the Java API's String.valueOf(Object) method. When you do concatenation, valueOf is used to get the String representation. There is a special case if the Object is null, in which case the string "null" is used.
public static Strin...
How do you make a web application in Clojure? [closed]
...ly elegant syntax. (It uses Jetty under the hood, but it hides the Servlet API from you unless you want it, which won't be often). Go look at the README at that URL, then download a snapshot and start playing.
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Interfaces with static fields in java for sharing 'constants'
...erface causes this implementation detail to leak into the class's exported API. It is of no consequence to the users of a class that the class implements a constant interface. In fact, it may even confuse them. Worse, it represents a commitment: if in a future release the class is modified so that i...
Regular expression for floating point numbers
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TL;DR
Use [.] instead of \. and [0-9] instead of \d to avoid escaping issues in some languages (like Java).
Thanks to the nameless one for originally recognizing this.
One relatively simple pattern for matching a floating point number is
[+-]?([0-9]*[.])?[0-9]+
This will match:
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BIO与NIO、AIO的区别(这个容易理解) - 操作系统(内核) - 清泛网 - 专注C/C++及内核技术
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三、AIO
与NIO不同，当进行读写操作时，只须直接调用API的read或write方法即可。这两种方法均为异步的，对于读操作而言，当有流可读取时，操作系统会将可读的流传入read方法的缓冲区，并通知应用程序；对于写操作而言，当...
Why is spawning threads in Java EE container discouraged?
...is now a standard, and correct way to create threads with the core Java EE API. By using Concurrency Utils, you ensure that your new thread is created, and managed by the container, guaranteeing that all EE services are available. Examples here and here
– Chris Ritchie
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Is Java Regex Thread Safe?
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Yes, from the Java API documentation for the Pattern class
Instances of this (Pattern) class are immutable and are safe for use by multiple concurrent threads. Instances of the Matcher class are not safe for such use.
If you are looking at ...
Latest jQuery version on Google's CDN
...vertent web breakage and no longer updates the file at
http://ajax.googleapis.com/ajax/libs/jquery/1/jquery.js. That file
will stay locked at version 1.11.1 as well.
The following, now moot, answer is preserved here for historical reasons.
Don't do this. Seriously, don't.
Linking to major ...
Which @NotNull Java annotation should I use?
...3305ecd1b415e2ab1b9ef8a9120b4
javax.validation.constraints from validation-api-1.0.0.GA-sources.jar
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How to get started on TDD with Ruby on Rails? [closed]
...ou write your application code. The cycle is generally write a test for an API that doesn't exist, run the test expecting it to fail, go write your API code, run your test again and make sure it passes. Then write your next test... and so on.
You might also be interested in this Rails guide.
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