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xpath find if node exists
...probably ask that as a new question at SO, but as a quick guide: html/body and not(html/body/node()) (i.e., just test if it exists and it does not contain any child nodes, or text nodes).
– Abel
Sep 6 '15 at 11:30
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When should one use final for method parameters and local variables?
... references ( for example ) that suggest using final as much as possible and I'm wondering how important that is. This is mainly in the the context of method parameters and local variables, not final methods or classes. For constants, it makes obvious sense.
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“405 method not allowed” in IIS7.5 for “PUT” method
... upload *.cab files to my server. On the server side, I registered a HTTP handler for *.cab file with the PUT method as below:
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What do I return if the return type of a method is Void? (Not void!)
... a function has to be Void?
Use return null. Void can't be instantiated and is merely a placeholder for the Class<T> type of void.
What's the point of Void?
As noted above, it's a placeholder. Void is what you'll get back if you, for example, use reflection to look at a method with a ...
float:left; vs display:inline; vs display:inline-block; vs display:table-cell;
... we can do about that now though. But the important thing is it does work, and it works in all browsers (even IE6/7), so use it if you like it.
The additional markup for clearing may not be necessary if you use the :after selector to clear the floats, but this isn't an option if you want to suppor...
Terminating a script in PowerShell
...w to do these things cleverly I would've probably tried that to begin with and figured out it works :) Thanks.
– kprobst
Jan 7 '10 at 18:10
122
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How can I see the SQL that will be generated by a given ActiveRecord query in Ruby on Rails
... been issued, but I'm wondering if there is a method that can be called on and ActiveRecord Query.
11 Answers
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Disable XML validation in Eclipse
My Eclipse validates XML files every time I save a file and it takes a while to validate them.
The project is created using gwt-maven-plugin.
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&& (AND) and || (OR) in IF statements
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No, it will not be evaluated. And this is very useful. For example, if you need to test whether a String is not null or empty, you can write:
if (str != null && !str.isEmpty()) {
doSomethingWith(str.charAt(0));
}
or, the other way around
if ...
How to clean project cache in Intellij idea like Eclipse's clean?
...for your installed version. The location of this folder depends on your OS and version installed.
Windows Vista, 7, 8, 10
<SYSTEM DRIVE>\Users\<USER ACCOUNT NAME>\.<PRODUCT><VERSION>
Linux/Unix
~/.<PRODUCT><VERSION>
Mac OS
~/Library/Caches/<PRODUCT><V...