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When and how should I use a ThreadLocal variable?
... object (I'm looking at you, SimpleDateFormat). Instead, give each thread its own instance of the object.
For example:
public class Foo
{
// SimpleDateFormat is not thread-safe, so give one to each thread
private static final ThreadLocal<SimpleDateFormat> formatter = new ThreadLocal...
SQL JOIN - WHERE clause vs. ON clause
After reading it, this is not a duplicate of Explicit vs Implicit SQL Joins .
The answer may be related (or even the same) but the question is different.
...
Can two applications listen to the same port?
...lications on the same machine bind to the same port and IP address? Taking it a step further, can one app listen to requests coming from a certain IP and the other to another remote IP?
I know I can have one application that starts off two threads (or forks) to have similar behavior, but can two ap...
Avoid synchronized(this) in Java?
... an
"accidentally" variant)
I'm more worried about accidentally. What it amounts to is that this use of this is part of your class' exposed interface, and should be documented. Sometimes the ability of other code to use your lock is desired. This is true of things like Collections.synchronize...
What is the difference between Polymer elements and AngularJS directives?
...n an import.
Nothing "links" <x-foo> to x-foo.html. In your example, it's assumed the Custom Element definition of <x-foo> (e.g. <element name="x-foo">) is defined in x-foo.html. When the browser sees that definition, it's registered as a new element.
On to questions!
What is th...
Regular expression for floating point numbers
I have a task to match floating point numbers. I have written the following regular expression for it:
12 Answers
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What are the use cases of Graph-based Databases (http://neo4j.org/)? [closed]
...
I used a graph database in a previous job. We weren't using neo4j, it was an in-house thing built on top of Berkeley DB, but it was similar. It was used in production (it still is).
The reason we used a graph database was that the data being stored by the system and the operations the syste...
window.onload vs
...d the onload event of the body tag? when do I use which and how should it be done correctly?
13 Answers
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Create a pointer to two-dimensional array
...o the first element of the array
uint8_t (*matrix_ptr)[20] = l_matrix;
With typedef, this looks cleaner
typedef uint8_t array_of_20_uint8_t[20];
array_of_20_uint8_t *matrix_ptr = l_matrix;
Then you can enjoy life again :)
matrix_ptr[0][1] = ...;
Beware of the pointer/array world in C, much ...
How to run a shell script in OS X by double-clicking?
...ipt that has user execution permission on OS X, but when I double click on it, it opens in a text editor. How can I get it to run by double-clicking it?
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