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Utility classes are evil? [closed]
...d object-oriented design, most classes should represent a single thing and all of its attributes and operations. If you are operating on a thing, that method should probably be a member of that thing.
However, there are times when you can use utility classes to group a number of methods together ...
The apk must be signed with the same certificates as the previous version
I had uploaded my app to Google Play (back when it was called Android Market) some time ago.
11 Answers
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Django dump data for a single model?
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As of version 1.1 and greater, the Django dumpdata management command allows you to dump data from individual tables:
./manage.py dumpdata myapp1 myapp2.my_model
You can also separate multiple apps and models on the command line. Here's the canonical definition:
django-admin dumpdata [app_l...
What are the First and Second Level caches in Hibernate?
...ed, but there is no option to get rid of it. but you should think about it all the time..
– ses
Mar 28 '13 at 17:39
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How to 'insert if not exists' in MySQL?
... any AUTO_INCREMENT column with failed insert. Probably because it's not really failed, but UPDATE'd.
– not2qubit
Oct 29 '13 at 21:36
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Indent starting from the second line of a paragraph with CSS
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Is it literally just the second line you want to indent, or is it from the second line (ie. a hanging indent)?
If it is the latter, something along the lines of this JSFiddle would be appropriate.
div {
padding-left: ...
Change app language programmatically in Android
Is it possible to change the language of an app programmatically while still using Android resources?
35 Answers
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Have bash script answer interactive prompts [duplicate]
Is it possible to have a bash script automatically handle prompts that would normally be presented to the user with default actions? Currently I am using a bash script to call an in-house tool that will display prompts to the user (prompting for Y/N) to complete actions, however the script I'm writ...
How to stop creating .DS_Store on Mac? [closed]
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Please install http://asepsis.binaryage.com/ and then reboot your mac.
ASEPSIS redirect all .DS_Store on your mac to /usr/local/.dscage
After that, You could delete recursively all .DS_Store from your mac.
find ~ -name ".DS_Store" -d...
What is the difference between up-casting and down-casting with respect to class variable
... supertype, while downcasting is casting to a subtype. Upcasting is always allowed, but downcasting involves a type check and can throw a ClassCastException.
In your case, a cast from a Dog to an Animal is an upcast, because a Dog is-a Animal. In general, you can upcast whenever there is an is-a re...