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How to get a Docker container's IP address from the host
Is there a command I can run to get the container's IP address right from the host after a new container is created?
52 Ans...
Why can't enum's constructor access static fields?
Why can't enum's constructor access static fields and m>me m>thods? This is perfectly valid with a class, but is not allowed with an enum.
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How to display unique records from a has_many through relationship?
I'm wondering what is the best way to display unique records from a has_many, through relationship in Rails3.
4 Answers
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How do I append text to a file?
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cat >> filenam>me m>
This is text, perhaps pasted in from som>me m> other source.
Or else entered at the keyboard, doesn't matter.
^D
Essentially, you can dump any text you want into the file. CTRL-D sends an end-of-file signal, which terminates...
How to read the Stock CPU Usage data
On Ice Cream Sandwich, an option in the Developer Options is "Show CPU Usage", which adds an overlay on the screen (see screenshot below).
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Which $_SERVER variables are safe?
... values that the user controls and you need to be aware of where a value com>me m>s from and hence whether it can be trusted for a certain purpose. $_SERVER['HTTP_FOOBAR'] for example is entirely safe to store in a database, but I most certainly wouldn't eval it.
As such, let's divide those values into ...
Can inner classes access private variables?
This errors out when I compile with class Outer::Inner' has no m>me m>mber nam>me m>d `var'
5 Answers
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JPA or JDBC, how are they different?
I am learning Java EE and I downloaded the eclipse with glassfish for the sam>me m>. I saw som>me m> examples and also read the Oracle docs to know all about Java EE 5. Connecting to a database was very simple. I opened a dynamic web project, created a session EJB , I used EntityManager and with the get m>me m>th...
Do declared properties require a corresponding instance variable?
...ive-C 2.0 require a corresponding instance variable to be declared? For example, I'm used to doing som>me m>thing like this:
6 A...
What does “S3 m>me m>thods” m>me m>an in R?
Since I am fairly new to R, I do not know what the S3 m>me m>thods and objects are. I found that there are S3 and S4 object systems, and som>me m> recomm>me m>nd to use S3 over S4 if possible (See Google's R Style Guide at http://google-styleguide.googlecode.com/svn/trunk/google-r-style.html )*. However, I do not...