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Check whether a string is not null and not empty
...ils
I like to use Apache commons-lang for these kinds of things, and especially the StringUtils utility class:
import org.apache.commons.lang.StringUtils;
if (StringUtils.isNotBlank(str)) {
...
}
if (StringUtils.isBlank(str)) {
...
}
...
How do I use Maven through a proxy?
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For details of setting up a proxy for Maven, see the mini guide.
Essentially you need to ensure the proxies section in either the global settings ([maven install]/conf/settings.xml), or user settings (${user.home}/.m2/settings.xml) is configured correctly. It is better to do this in your user set...
Java Class.cast() vs. cast operator
...ject) isn't special to the compiler. It could be optimized when used statically (i.e. Foo.class.cast(o) rather than cls.cast(o)) but I've never seen anybody using it - which makes the effort of building this optimization into the compiler somewhat worthless.
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Command substitution: backticks or dollar sign / paren enclosed? [duplicate]
...orm. The second form, using a pair of backquotes (the "`" character, also called a backtick and a grave accent), is the historical way of doing it. The first form, using dollar sign and parentheses, is a newer POSIX form, which means it's probably a more standard way of doing it. In turn, I'd think ...
What Are Some Good .NET Profilers?
...te basic memory profiling.
dotTrace integrates with Resharper, which is really convenient, as you can profile the performance of a unit test with one click from the IDE. However, dotTrace often seems to give spurious results (e.g. saying that a method took several years to run)
I prefer the way th...
Appropriate hashbang for Node.js scripts
...tching back and forth between OS X and Ubuntu. In the former, Node is installed as node , but in the latter it is nodejs . At the top of my script, I can have:
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CSS: bolding some text without changing its container's size
I have a horizontal navigation menu, which is basically just a <ul> with the elements set side-by-side. I do not define width, but simply use padding, because I would like the widths to be defined by the width of the menu item. I bold the currently-selected item.
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Handling InterruptedException in Java
... way to do it?
You've probably come to ask this question because you've called a method that throws InterruptedException.
First of all, you should see throws InterruptedException for what it is: A part of the method signature and a possible outcome of calling the method you're calling. So start b...
Do the JSON keys have to be surrounded by quotes?
...ion on (unquoted) reserved keywords as keys, so they just required quoting all keys.
– BallpointBen
Aug 21 '18 at 23:01
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What does the constant 0.0039215689 represent?
...modern compilers may be smart enough to do this optimization, they are not allowed to do it unless you explicitly tell them to via a compiler flag.
Related: Why doesn't GCC optimize a*a*a*a*a*a to (a*a*a)*(a*a*a)?
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