大约有 224 项符合查询结果（耗时：0.0306秒） [XML]
What should my Objective-C singleton look like? [closed]
...really, truly, ONLY want a single instance of your class. Which you don't, esp. for unit tests.
– Chris Hanson
Sep 28 '08 at 9:35
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Can you use an alias in the WHERE clause in mysql?
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Nice explanation, esp. the "but in a where clause... repeat.." part
– th3an0maly
Jan 17 '13 at 7:57
4
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Windows batch files: .bat vs .cmd?
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Chris: see the current version of the Wikipedia article, esp. the comment by Mark Zbikowski at groups.google.com/group/…
– Mark
May 4 '09 at 9:01
3
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Build Eclipse Java Project from Command Line
...h is after.
For a batch compilation, please refer to Compiling Java code, especially the section "Using the batch compiler"
The batch compiler class is located in the JDT Core plug-in. The name of the class is org.eclipse.jdt.compiler.batch.BatchCompiler. It is packaged into plugins/org.eclipse...
Iterate over the lines of a string
...ry fast ways; putting strings together by programming at a very low level (esp. by loops of += of very small pieces) can be quite slow.
Edit: added @Jacob's proposal, slightly modified to give the same results as the others (trailing blanks on a line are kept), i.e.:
from cStringIO import StringIO...
C# vs Java Enum (for those new to C#)
...tances of that class:
using System;
using System.Collections.Generic;
namespace ConsoleApplication1
{
class Program
{
static void Main(string[] args)
{
Planet planetEarth = Planet.MERCURY;
double earthRadius = pEarth.Radius; // Just threw it in to s...
Most efficient way to check for DBNull and then assign to a variable?
... In virtually all cases == is going to be equivalent to ReferenceEquals (esp. to DBNull) and it's much more readable. Use @Marc Gravell's optimization if you want, but I'm with him -- probably not going to help much. BTW, reference equality ought to always beat type checking.
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How does this CSS produce a circle?
...r resources
References
W3C: CSS Backgrounds and Borders Module Level 3 (esp. 5. Rounded Corners)
Demonstrations
Please open the demo below, which shows how the border-radius affects the border (think of the inner blue box as the content box, the inner black border as the padding border, the e...
Apache Spark: The number of cores vs. the number of executors
...pu-vcores, should probably be set to 63 *
1024 = 64512 (megabytes) and 15 respectively. We avoid allocating 100%
of the resources to YARN containers because the node needs some
resources to run the OS and Hadoop daemons. In this case, we leave a
gigabyte and a core for these system processes. Cloude...
Placeholder in UITextView
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in some cases (esp. iOS 5 compatibility) it is required to override paste: - (void)paste:(id)sender { [super paste:sender]; [self textChanged:nil]; }
– Martin Ullrich
Jul 14 '11 at 15:32
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