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Java Generics: Cannot cast List to List? [duplicate]
...ne at compile time.
In the first case, imagine that the code did compile, and was followed by:
b1.add(new SomeOtherTree());
DataNode node = a1.get(0);
What would you expect to happen?
You can do this:
List<DataNode> a1 = new ArrayList<DataNode>();
List<? extends Tree> b1 = a1...
What's the maximum value for an int in PHP?
...
integers. Integer size can be
determined using the constant
PHP_INT_SIZE, and maximum value using
the constant PHP_INT_MAX since PHP
4.4.0 and PHP 5.0.5.
64-bit platforms usually have a maximum value of about 9E18, except on Windows prior to PHP 7, where it was always 32 bit.
...
ReactJS SyntheticEvent stopPropagation() only works with React events?
...gation() within a ReactJS component to stop a click event from bubbling up and triggering a click event that was attached with JQuery in legacy code, but it seems like React's stopPropagation() only stops propagation to events also attached in React, and JQuery's stopPropagation() doesn't stop propa...
Datetime equal or greater than today in MySQL
...s there is overhead of converting DATETIME to date via the DATE() function and then comparing with the where condition.
– roopunk
Aug 14 '14 at 9:48
...
ReadOnlyCollection or IEnumerable for exposing member collections?
...s.Immutable package, change your field type to be an immutable collection, and then expose that directly - assuming Foo itself is immutable, of course.
Updated answer to address the question more directly
Is there any reason to expose an internal collection as a ReadOnlyCollection rather than a...
ios Upload Image and Text using HTTP POST
...forKey:[NSString stringWithString:@"title"]];
// the boundary string : a random string, that will not repeat in post data, to separate post data fields.
NSString *BoundaryConstant = [NSString stringWithString:@"----------V2ymHFg03ehbqgZCaKO6jy"];
// string constant for the post parameter 'file'. M...
What does !! mean in ruby?
...ly not necessary to use though since the only false values to Ruby are nil and false, so it's usually best to let that convention stand.
Think of it as
!(!some_val)
One thing that is it used for legitimately is preventing a huge chunk of data from being returned. For example you probably don't ...
How can I tell who forked my repository on GitHub?
...can see the number of forks, but I'd like to know who forked my repository and what kind of changes they made to it.
3 Answ...
Configure Log4net to write to multiple files
...
What if you want File1Appender to log DEBUG errors and File2Appender to log ERROR errors?
– JsonStatham
May 8 '14 at 13:48
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Using wget to recursively fetch a directory with arbitrary files in it
...e I store some config files. I'd like to use wget to pull those files down and maintain their current structure. For instance, the remote directory looks like:
...