大约有 11,643 项符合查询结果（耗时：0.0232秒） [XML]
Do you (really) write exception safe code? [closed]
...If you are catching everything in your top control scope (thread, process, etc.), then you can be sure that you will continue to run in the face of exceptions (most of the time). The same techniques will also help you continue to run correctly in the face of exceptions without try/catch blocks ever...
dynamically add and remove view to viewpager
...iewPage can display. This must
// never be 0.
@Override
public int getCount ()
{
return views.size();
}
//-----------------------------------------------------------------------------
// Used by ViewPager.
@Override
public boolean isViewFromObject (View view, Object object)
...
Map Tiling Algorithm
...
[1] [*] [1] [1] [*] [1] [1] [*] [2] [1] [*] [2] [1] [*] [1] etc.
[1] [1] [1] [1] [2]
There will be 16 patterns in total. If you take advantage of rotational and reflectional symmetry there will be even fewer.
'A' would be a p...
Perforce for Git users? [closed]
...s a pretty traditional revision control system (closer to CVS, Subversion, etc.) and normally is considered to be less complicated than modern distributed revision control systems.
Trying to map commands from one to the other is not the right approach; concepts from centralized vs. distributed revi...
When and why are database joins expensive?
...ires retrieval of only the keys. In practice, not even the key values are fetched: the key hash values are used for join comparisons, mitigating the cost of multi-column joins and radically reducing the cost of joins involving string comparisons. Not only will vastly more fit in cache, there's a lot...
Simple way to encode a string according to a password?
...rs from the lower ascii range! See precedence of % operator, unicode input etc. See qneill's answer for working code
– le_m
Nov 14 '14 at 23:23
...
What is an existential type?
...definition, list all possible uses, their relation to abstract data types, etc.) because I'm simply not knowledgeable enough for that. I'll demonstrate only (using Java) what this HaskellWiki article states to be the principal effect of existential types:
Existential types can be used for severa...
What is the optimal algorithm for the game 2048?
...ontaining no hard-coded intelligence (i.e no heuristics, scoring functions etc). The AI should "know" only the game rules, and "figure out" the game play. This is in contrast to most AIs (like the ones in this thread) where the game play is essentially brute force steered by a scoring function repre...
What is a NullPointerException, and how do I fix it?
...ou should know, Java types are divided into primitive types (boolean, int, etc.) and reference types. Reference types in Java allow you to use the special value null which is the Java way of saying "no object".
A NullPointerException is thrown at runtime whenever your program attempts to use a null...
How can I sort arrays and data in PHP?
...ilar. Your rewrite contains a lot of details (pass by reference, big table etc.), but that detail distracts from the smooth introduction to the core topic of the workings of the comparison function, IMHO. I explicitly refer to the manual several times on purpose, because that's where such detail sho...