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How do you cast a List of supertypes to a List of subtypes?
... methods.
Filtering the list based on the type
A more type-safe way of converting from a List<Supertype> to a List<Subtype> is to actually filter the list, and create a new list that contains only elements that have certain type. There are some degrees of freedom for the implementat...
Error java.lang.OutOfMemoryError: GC overhead limit exceeded
...t'll be hard to tell which one is misbehaving. Separating the applications into distinct JVMs might be the easiest solution.
– Joachim Sauer
Mar 1 '12 at 11:48
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What is the advantage of using abstract classes instead of traits?
...ure even traits can have constructor parameters
Abstract classes are fully interoperable with Java. You can call them from Java code without any wrappers. Traits are fully interoperable only if they do not contain any implementation code
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The constant cannot be marked static
...tance to reference the const value).
I want to also add this important point: When you link against (reference) an assembly with a public const, that value is copied into your assembly. So if the const value in the referenced assembly changes, your assembly will still have the originally compiled-...
How to delete duplicate lines in a file without sorting it in Unix?
... last line if the file has an even number of lines.
To convert scripts which used the former behavior of N (deleting
the pattern space upon reaching the EOF) to scripts compatible with
all versions of sed, change a lone "N;" to "$d;N;".
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git:// protocol blocked by company, how can I get around that?
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For a little more control of which URL gets converted, you can specify part of URL as well. For example: I have a private internal server 'myserver.lan.example.com' that hosts git repos over SSH (gitlab) but not HTTPS. Therefore, I must use SSH if I want to take adva...
MySQL - Rows to Columns
...three-step process (with an optional fourth step):
select the columns of interest, i.e. y-values and x-values
extend the base table with extra columns -- one for each x-value
group and aggregate the extended table -- one group for each y-value
(optional) prettify the aggregated table
Let's apply...
PHP: Count a stdClass object
...e more, it might be better to use the $assoc param with json_encode, which converts it to an array. That property you're getting is named from the timestamp which is going to be a right pain to access regularly. As an array you could just do count( $trends[0] );
– Rob Drimmie
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Using HTML5/JavaScript to generate and save a file
...it's pretty slow (Collada is a very verbose format), so I'm going to start converting files to a easier to use format (probably JSON). I already have the code to parse the file in JavaScript, so I may as well use it as my exporter too! The problem is saving.
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RESTful on Play! framework
... I am trying out your example, I am curious where the posted JSON data is converted to User class. for example, inside the createUser function I find the newUser is null.
– Gary
Dec 15 '10 at 3:50
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