大约有 41,000 项符合查询结果（耗时：0.0664秒） [XML]
Does setting Java objects to null do anything anymore?
...old books and found a copy of "Practical Java" by Peter Hagger. In the performance section, there is a recommendation to set object references to null when no longer needed.
...
Setting default values for columns in JPA
Is it possible to set a default value for columns in JPA, and if, how is it done using annotations?
18 Answers
...
How can I center an absolutely positioned element in a div?
...lute; left: 50%;">
<div style="position: relative; left: -50%; border: dotted red 1px;">
I am some centered shrink-to-fit content! <br />
tum te tum
</div>
</div>
</body>
...
How to remove part of a string before a “:” in javascript?
If I have a string Abc: Lorem ipsum sit amet , how can I use JavaScript/jQuery to remove the string before the : including the : . For example the above string will become: Lorem ipsum sit amet .
...
What does the “@” symbol do in Powershell?
...ialise arrays. What exactly does the @ symbol denote and where can I read more about it?
5 Answers
...
Using IoC for Unit Testing
How can a IoC Container be used for unit testing? Is it useful to manage mocks in a huge solution (50+ projects) using IoC? Any experiences? Any C# libraries that work well for using it in unit tests?
...
Can Visual Studio 2012 be installed side-by-side w/ Visual Studio 2010?
Will Visual Studio 2012 interfere/break .NET 4 and/or Visual Studio 2010 if installed side-by-side on the same instance of Windows?
...
How to destroy an object?
...
You're looking for unset().
But take into account that you can't explicitly destroy an object.
It will stay there, however if you unset the object and your script pushes PHP to the memory limits the objects not needed will be garbage colle...
Async/Await vs Threads
...letely replace the old way of using Threads ?
No. A thread can do many more useful things. Await is specifically designed to deal with something taking time, most typically an I/O request. Which traditionally was done with a callback when the I/O request was complete. Writing code that relies ...
Why are floating point numbers inaccurate?
Why do some numbers lose accuracy when stored as floating point numbers?
6 Answers
6
...