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Difference between onStart() and onResume()
...E: I've deliberately left out the calls to things like super.onCreate(...) etc. This is pseudo-code so give me some artistic licence here. ;)
The methods for DriveToWorkActivity follow...
protected void onCreate(...) {
openGarageDoor();
unlockCarAndGetIn();
closeCarDoorAndPutOnSeatBelt...
Convert.ChangeType() fails on Nullable Types
...
You have to get the underlying type in order to do that...
Try this, I've used it successfully with generics:
//Coalesce to get actual property type...
Type t = property.PropertyType();
t = Nullable.GetUnderlyingType(t) ?? t;
//Coalesce to set the safe value us...
What is the difference between a field and a property?
...e can put logic in the Property also allows us to perform validation logic etc if we need it.
C# 3 has the possibly confusing notion of autoproperties. This allows us to simply define the Property and the C#3 compiler will generate the private field for us.
public class Person
{
private string _...
Configuring Log4j Loggers Programmatically
... on the root logger with
Logger.getRootLogger().getLoggerRepository().resetConfiguration();
and start with adding your own. You need log4j in the classpath of course for this to work.
Remark:
You can take any Logger.getLogger(...) you like to add appenders. I just took the root logger because i...
How do you use the ellipsis slicing syntax in Python?
... a = arange(16).reshape(2,2,2,2)
Now, you have a 4-dimensional matrix of order 2x2x2x2. To select all first elements in the 4th dimension, you can use the ellipsis notation
>>> a[..., 0].flatten()
array([ 0, 2, 4, 6, 8, 10, 12, 14])
which is equivalent to
>>> a[:,:,:,0].f...
What is a stack trace, and how can I use it to debug my application errors?
...if(dog == null || dog.firstName == null) return;
The above is the proper order to check for nulls, we start with the base object, dog in this case, and then begin walking down the tree of possibilities to make sure everything is valid before processing. If the order were reversed a NPE could pote...
Repair all tables in one go
...E CONTINUE HANDLER FOR SQLSTATE '02000' SET endloop=1;
OPEN rCursor;
FETCH rCursor INTO tableName;
WHILE endloop = 0 DO
SET @sql = CONCAT("REPAIR TABLE `", tableName, "`");
PREPARE statement FROM @sql;
EXECUTE statement;
FETCH rCursor INTO tableName;
END WHILE;
CLOSE rC...
Casperjs/PhantomJs vs Selenium
...lly by changing the underlying WebDriver implementation to Chrome, Firefox etc.
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Aspect Oriented Programming vs. Object-Oriented Programming
...ecially handy for adding standard code like logging, performance tracking, etc. to methods without clogging up the method code with this standard code.
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In C# what is the difference between a destructor and a Finalize method in a class?
...nmanaged recources in the dispose
method like database connection, files etc. The class implementing
dispose method should implement IDisposable interface.A Dispose method
should call the GC.SuppressFinalize method for the object it is
disposing if the class has desturctor because it has alr...