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List vs List
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The difference is that, for example, a
List<HashMap<String,String>>
is a
List<? extends Map<String,String>>
but not a
List<Map<String,String>>
So:
void withWilds( List<? extends Map<String,String>> ...
Storing JSON in database vs. having a new column for each key
I am implementing the following model for storing user related data in my table - I have 2 columns - uid (primary key) and a meta column which stores other data about the user in JSON format.
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Using DISTINCT and COUNT together in a MySQL Query
Is something like this possible:
7 Answers
7
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Group by in LINQ
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Absolutely - you basically want:
var results = from p in persons
group p.car by p.PersonId into g
select new { PersonId = g.Key, Cars = g.ToList() };
Or as a non-query expression:
var results = persons.GroupBy(
p => p.PersonId,
p =&...
Collapse sequences of white space into a single character and trim string
Consider the following example:
13 Answers
13
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How to stretch the background image to fill a div
I want to set a background image to different divs, but my problems are:
10 Answers
10...
to drawRect or not to drawRect (when should one use drawRect/Core Graphics vs subviews/images and wh
To clarify the purpose of this question: I know HOW to create complicated views with both subviews and using drawRect. I'm trying to fully understand the when's and why's to use one over the other.
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Cleanest way to toggle a boolean variable in Java?
Is there a better way to negate a boolean in Java than a simple if-else?
9 Answers
9
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Setting environment variables on OS X
What is the proper way to modify environment variables like PATH in OS X?
31 Answers
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Unix's 'ls' sort by name
Can you sort an ls listing by name?
11 Answers
11
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