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What's the difference between SoftReference and WeakReference in Java?
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In Java; order from strongest to weakest, there are: Strong, Soft, Weak and Phantom
A Strong reference is a normal reference that protects the referred object from collection by GC. i.e. Never garbage collects.
A Soft reference i...
MySQL query to get column names?
... DESCRIBE cannot be used with WHERE. For example : SHOW COLUMNS FROM acct__order WHERE ``Key`` = 'PRI'; to get the Primary key of a table is not working with DESCRIBE.
– Meloman
Sep 2 at 11:45
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How to hide columns in HTML table?
...l hold the space. For the div tags you would have to use display: none; in order to truly collapse and not hold the space.
– Dov Miller
Apr 3 '16 at 11:30
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Determine if running on a rooted device
... environment variable and checks if a "su" file exists in one of them.
In order to truly check for root access the "su" command must actually be run. If an app like SuperUser is installed, then at this point it may ask for root access, or if its already been granted/denied a toast may be shown indi...
Enums and Constants. Which to use when?
... but it won't happen accidentally. Worse is the possibility to confuse the order of parameters.
void method(int a, int b) {...}
If constant A only may go into a and constant B only may go into b, then using two different enum types will uncover any misuse during the compilation.
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Python csv string to array
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Make sure the Unicode file does not have a BOM (Byte Order Marker)
– Pierre
Oct 13 '14 at 14:04
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Convert array of strings into a string in Java
...s you might not really notice the difference, but for large ones it can be orders of magnitude slower.
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Detecting that the browser has no mouse and is touch-only
... as touch device if first interaction was a touch.
Considering the given order in which events are processed:
touchstart
touchmove
touchend
mouseover
mousemove
mousedown
mouseup
click
We can assume that if mouse event gets triggered before touch, it is a real mouse event, not an emulated one. ...
What are Long-Polling, Websockets, Server-Sent Events (SSE) and Comet?
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Highly active question. Earn 10 reputation in order to answer this question. The reputation requirement helps protect this question from spam and non-answer activity.
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In C#, how do I calculate someone's age based on a DateTime type birthday?
..., the current year times 10000 is nowhere near an integer overflow, by two orders of magnitude. 20,150,000 vs 2,147,483,648
– GalacticCowboy
Sep 3 '15 at 20:23
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