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Java time-based map/cache with expiring keys [closed]
Do any of you know of a Java Map or similar standard data store that automatically purges entries after a given timeout? This means aging, where the old expired entries “age-out” automatically.
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Select all columns except one in MySQL?
... This is way worse than just specifying the columns which is a known best practice.
– HLGEM
Jan 16 '14 at 18:08
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Set transparent background of an imageview on Android
...the below code for black:
<color name="black">#000000</color>
Now if you want to use opacity then you can use the below code:
<color name="black">#99000000</color>
And the below for opacity code:
100% — FF
95% — F2
90% — E6
85% — D9
80% — CC
75% — BF
70% — B3
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Delete a line in Eclipse
...ur favourite hotkey.
Window->Preferences
General->Editors->Keys.
Now type "Delete" and reassign the filtered commando.
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Why would you use an ivar?
...s have memorized how to call a hidden accessor dynamically (as long as we know the name…). Meanwhile, most of us have not memorized how to properly access ivars which aren't visible (beyond KVC). The class continuation helps, but it does introduce vulnerabilities.
This workaround's obvious:
if ([o...
Finding the index of an item in a list
...ist in order, until it finds a match. If your list is long, and you don't know roughly where in the list it occurs, this search could become a bottleneck. In that case, you should consider a different data structure. Note that if you know roughly where to find the match, you can give index a hint. F...
How to unload a package without restarting R
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@AriB.Friedman, now as a question.
– Eric Fail
Jul 9 '13 at 12:41
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Why use prefixes on member variables in C++ classes
... to nul-terminated char arrays, and it's not really all that difficult to know that "customerName" is a string!
However, I do use prefixes to specify the usage of a variable (essentially "Apps Hungarian", although I prefer to avoid the term Hungarian due to it having a bad and unfair association wi...
Get object by id()? [duplicate]
...cast(id(a), ctypes.py_object).value
output:
hello world
If you don't know whether the object is still there, this is a recipe for undefined behavior and weird crashes or worse, so be careful.
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How to undo a git pull?
...git pull on account of unwanted commits on the remote origin, but I don't know to which revision I have to reset back to.
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