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How to use WeakReference in Java and Android development?
... to protect the object from the garbage collector. A classic example is a cache that you want to be garbage collected when memory usage gets too high (often implemented with WeakHashMap).
Be sure to check out SoftReference and PhantomReference as well.
EDIT: Tom has raised some concerns over impl...
Places where JavaBeans are used?
What is a JavaBean and why do I need it? Since I can create all apps with the class and interface structure? Why do I need beans? And can you give me some examples where beans are essential instead of classes and interfaces?
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How to change the CHARACTER SET (and COLLATION) throughout a database?
...v9.0 -- _0900_ (new)
_bin -- just compare the bits; don't consider case folding, accents, etc
_ci -- explicitly case insensitive (A=a) and implicitly accent insensitive (a=á)
_ai_ci -- explicitly case insensitive and accent insensitive
_as (etc) -- accent-sensitive (etc)
_bin ...
Logging levels - Logback - rule-of-thumb to assign log levels
...
I mostly build large scale, high availability type systems, so my answer is biased towards looking at it from a production support standpoint; that said, we assign roughly as follows:
error: the system is in distress, customers are probably bein...
HTML 5 Favicon - Support?
... not standard. Also we wrap the .ico favicon in a IE conditional comment because Chrome and Safari will use the .ico file if it is present, despite other options available, not what we would like.
The above covers IE up to IE 9. IE 11 accepts PNG favicons, however, IE 10 does not. Also IE 10 does ...
overlay two images in android to set an imageview
I am trying to overlay two images in my app, but they seem to crash at my canvas.setBitmap() line. What am I doing wrong?
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What is the JSF resource library for and how should it be used?
...mefaces-vader" name="theme.css" />
It should become clear that it basically represents the common library/module/theme name where all of those resources commonly belong to.
Easier identifying
This way it's so much easier to specify and distinguish where those resources belong to and/or are co...
What's the $unwind operator in MongoDB?
...s for a dynamic means of adding and obtaining the data from your storage locations.
That being said, in order to understand the concept behind the $unwind parameter, you first must understand what the use case that you are trying to quote is saying. The example document from mongodb.org is as follo...
Using smart pointers for class members
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A unique_ptr would not work because of getDevice(), right?
No, not necessarily. What is important here is to determine the appropriate ownership policy for your Device object, i.e. who is going to be the owner of the object pointed to by your (smart) po...
How do I change selected value of select2 dropdown with JqGrid?
...s might not work, however the following examples should work.
Solution 1: Causes all attached change events to trigger, including select2
$('select').val('1').trigger('change');
Solution 2: Causes JUST select2 change event to trigger
$('select').val('1').trigger('change.select2');
See this js...