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Can “this” ever be null in Java?
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No it can't. If you're using this, then you're in the instance so this isn't null.
The JLS says :
When used as a primary expression, the keyword this denotes a value that is a reference to the object for which the instance method wa...
Cycles in family tree software
...tal misunderstanding of what a family tree is supposed to be.
Let me clarify, I also work for a company that has (as one of its products) a family tree in its portfolio, and we have been struggling with similar problems.
The problem, in our case, and I assume your case as well, comes from the GED...
Is it possible to decrypt MD5 hashes?
...e value. The thing that makes hashes interesting is that it is incredibly difficult to find two pieces of data that hash to the same value, and the chances of it happening by accident are almost 0.
A simple example for a (very insecure) hash function (and this illustrates the general idea of it bei...
Thymeleaf: how to use conditionals to dynamically add/remove a CSS class
... to add/remove dynamically a CSS class to/from a simple div with the th:if clause?
10 Answers
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How to correctly dismiss a DialogFragment?
...tself:
public void dismiss()
Dismiss the fragment and its dialog. If the fragment was added to the back stack, all back stack state up to and including this entry will be popped. Otherwise, a new transaction will be committed to remove the fragment.
As you can see, this takes care not onl...
WPF global exception handler [duplicate]
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Bad idea if you create multiple instances of the window...
– Thomas Levesque
Sep 24 '09 at 15:50
1
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Nginx url重写rewrite实例详解 - 更多技术 - 清泛网移动版 - 专注C/C++及内核技术
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}
server {
listen 80;
server_name *.test.com;
if ( $http_host ~* "^(.*)\.test\.com$") {
set $domain $1;
rewrite ^(.*) http://www.test.com/test/$domain/ break;
}
}
方法二：
当访问http://www.jbyuan.com跳转到http://www...
“No X11 DISPLAY variable” - what does it mean?
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If you're on the main display, then
export DISPLAY=:0.0
or if you're using csh or tcsh
setenv DISPLAY :0.0
before running your app.
Actually, I'm surprised it isn't set automatically. Are you trying to start this appl...
How do you migrate an IIS 7 site to another server?
...der "Management"
Click “Export Configuration”. (You can use a password if you are sending them across the internet, if you are just gonna move them via a USB key then don't sweat it.)
Move these files to your new server
administration.config
applicationHost.config
configEncKey.key
On the new ...
Why doesn't std::queue::pop return value.?
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So, whats the difference, pop function could have done the same thing.
It could indeed have done the same thing. The reason it didn't, is because a pop that returned the popped element is unsafe in the presence of exceptions (having to re...