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When to use LinkedList over ArrayList in Java?
...) for index = 0.
ArrayList<E>, on the other hand, allow fast random read access, so you can grab any element in constant time. But adding or removing from anywhere but the end requires shifting all the latter elements over, either to make an opening or fill the gap. Also, if you add more elem...
How do servlets work? Instantiation, sessions, shared variables and multithreading
...tore their scoped beans as an attribute of its closest matching scope.
Thread Safety
That said, your major concern is possibly thread safety. You should now know that servlets and filters are shared among all requests. That's the nice thing about Java, it's multithreaded and different threads (re...
mysql: see all open connections to a given database?
...sl_connect_renegotiates | 0 |
| Ssl_finished_connects | 0 |
| Threads_connected | 127 |
+--------------------------+-------+
7 rows in set (0.01 sec)
Feel free to use
Mysql-server-status-variables or Too-many-connections-problem
...
Change the name of a key in dictionary
...u can use dictionary comprehension:
This is an example I encountered while reading a CSV using a DictReader. The user had suffixed all the column names with ':'
ori_dict = {'key1:' : 1, 'key2:' : 2, 'key3:' : 3}
to get rid of the trailing ':' in the keys:
corrected_dict = { k.replace(':', ''): v ...
Android disable screen timeout while app is running
...
For the ones who don't have time to read linked pdf: "Wakelocks are costly if forgotten", "Consider using android:keepScreenOn to ensure correctness".
– lenrok258
Feb 7 '16 at 15:11
...
Should CSS always preceed Javascript?
...<link href="...">s before my JS <script src="...">s because "I read one time that it's better." So, you're right; it's high time we do some actual research!
I set up my own test harness in Node (code below). Basically, I:
Made sure there was no HTTP caching so the browser would have...
Convert array to JSON
... this? I'd prefer not to attach another js file if jQuery has a function already.
– dotty
Feb 19 '10 at 10:27
1
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Performance difference for control structures 'for' and 'foreach' in C#
... the difference to performance won't be significant, but the difference to readability favours the foreach loop.
I'd personally use LINQ to avoid the "if" too:
foreach (var item in list.Where(condition))
{
}
EDIT: For those of you who are claiming that iterating over a List<T> with foreach...
How do CDI and EJB compare? interact?
...DI and some of the rest of the Java EE acronym soup that confused me. More reading seems to indicate that there is hope to align the annotations.
– Tim
Jan 15 '11 at 22:54
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How to remove all white spaces in java [duplicate]
...have a programming assignment and part of it requires me to make code that reads a line from the user and removes all the white space within that line.
the line can consist of one word or more.
...