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Where do gems install?
...nt.
In a terminal run gem env
You should see an entry INSTALLATION DIRECTORY, but there is also GEM PATHS which is where it's loading all your gems from in your current environment.
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What version of javac built my jar?
...patibility. Is the compiler version embedded somewhere in the class files or jar?
20 Answers
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Object reference not set to an instance of an object.Why doesn't .NET show which object is `null`?
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(For information about the new exception helper in Visual Studio 2017 see the end of this answer)
Consider this code:
String s = null;
Console.WriteLine(s.Length);
This will throw a NullReferenceException in the second li...
change cursor to finger pointer
... I don't know that I need to insert into the "onmouseover" so that the cursor will change to finger pointer like a regular link:
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In Hibernate Validator 4.1+, what is the difference between @NotNull, @NotEmpty, and @NotBlank?
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@NotNull: The CharSequence, Collection, Map or Array object is not null, but can be empty.
@NotEmpty: The CharSequence, Collection, Map or Array object is not null and size > 0.
@NotBlank: The string is not null and the trimmed length is greater than zero.
To he...
What is the benefit of using Fragments in Android, rather than Views?
When developing for Android , you can set your target (or minimum) sdk to 4 (API 1.6) and add the android compatibility package (v4) to add support for Fragments . Yesterday I did this and successfully implemented Fragments to visualize data from a custom class.
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How do I add a Fragment to an Activity with a programmatically created content view
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It turns out there's more than one problem with that code. A fragment cannot be declared that way, inside the same java file as the activity but not as a public inner class. The framework expects the fragment's constructor (with no parameters) to ...
Confused by python file mode “w+”
...t you write after this point
f.write('somedata\n')
f.seek(0) # Important: return to the top of the file before reading, otherwise you'll just read an empty string
data = f.read() # Returns 'somedata\n'
Note the f.seek(0) -- if you forget this, the f.read() call will try to read from t...
Getting the last argument passed to a shell script
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This is a bit of a hack:
for last; do true; done
echo $last
This one is also pretty portable (again, should work with bash, ksh and sh) and it doesn't shift the arguments, which could be nice.
It uses the fact that for implicitly loops over the arg...
Parse usable Street Address, City, State, Zip from a string [closed]
...the individual sections of the address into their appropriate fields in a normalized table. I need to do this for approximately 4,000 records and it needs to be repeatable.
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