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Does java.util.List.isEmpty() check if the list itself is null? [duplicate]
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You're trying to call the isEmpty() method on a null reference (as List test = null;
). This will surely throw a NullPointerException. You should do if(test!=null) instead (Checking for null first).
The method isEmpty() returns true, if an ArrayList object co...
When should I use double instead of decimal?
I can name three advantages to using double (or float ) instead of decimal :
12 Answers
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Efficient Algorithm for Bit Reversal (from MSB->LSB to LSB->MSB) in C
...n C, but should be portable to your language of choice (just don't look at me when they're not as fast :)
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Low Memory (32-bit int, 32-bit machine)(from here):
unsigned int
reverse(register unsigned int x)
{
x = (((x & 0xaaaaaaaa) >> 1) | ((x & 0x55555555) << 1));
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How to convert a scala.List to a java.util.List?
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Scala List and Java List are two different beasts, because the former is immutable and the latter is mutable. So, to get from one to another, you first have to convert the Scala List into a mutable collection.
On Scala 2.7:
import scala.collection.jcl.Conversions.unconvertList
import scal...
How to echo or print an array in PHP?
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Thank you for this. Can you tell me how can I echo for example only the type of the Array [1] ?
– EnexoOnoma
Mar 22 '12 at 5:29
7
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How to print a debug log?
I'd like to debug some PHP code, but I guess printing a log to screen or file is fine for me.
15 Answers
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ImportError: No module named site on Windows
I am trying to install Python for the first time. I downloaded the following installer from the Python website:
Python 2.7.1 Windows Installer (Windows binary -- does not include source) . I then ran the installer, selected 'All Users' and all was fine. I installed Python into the default location:...
Wrapping chained method calls on a separate line in Eclipse for Java
I haven't been successful in figuring out how to wrap each method call in Eclipse . For example, I have this:
7 Answers
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Disable a Button
...is false.
button.isEnabled = false
should do it.
Here is the Swift documentation for UIControl's isEnabled property.
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Where is svcutil.exe in Windows 7?
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The command promt itself is found in the start menu under Visual Studio 2015\Visual Studio Tools\Developer Command Prompt for VS2015 (for Visual Studio 2015 at least).
– Zero3
Mar 3 '16 at 13:24
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