大约有 23,000 项符合查询结果（耗时：0.0470秒） [XML]
static allocation in java - heap, stack and permanent generation
...h needed to really know. Most people here (myself included) are answering based on things they have seen written elsewhere, or what they have inferred. Usually what is written here, or in various articles and web pages, is based on other sources which may or may not be definitive. Often it is sim...
Which Boost features overlap with C++11?
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Replaceable by C++11 language features or libraries
Foreach → range-based for
Functional/Forward → Perfect forwarding (with rvalue references, variadic templates and std::forward)
In Place Factory, Typed In Place Factory → Perfect forwarding (at least for the documented use cases)
Lambda ...
Convert Decimal to Double
...is a type which is native to the CPU (internal representation is stored in base 2), calculations made with Double perform better then Decimal (which is represented in base 10 internally).
share
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im...
Programmatically Lighten or Darken a hex color (or rgb, and blend colors)
... amount. Just pass in a string like "3F6D2A" for the color ( col ) and a base10 integer ( amt ) for the amount to lighten or darken. To darken, pass in a negative number (i.e. -20 ).
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select * vs select column
...erlying on-disk storage structure for everything (including table data) is based on defined I/O Pages (in SQL Server for e.g., each Page is 8 kilobytes). And every I/O read or write is by Page.. I.e., every write or read is a complete Page of data.
Because of this underlying structural constraint...
Purpose of #!/usr/bin/python3
...re out what program should be started to interpret the script.
A non Unix based OS will use its own rules for figuring out how to run the script. Windows for example will use the filename extension and the # will cause the first line to be treated as a comment.
If the path to the Python executable...
How does mockito when() invocation work?
...on what param.
I found this article very helpful:
Explanation how proxy based Mock Frameworks work (http://blog.rseiler.at/2014/06/explanation-how-proxy-based-mock.html).
The author implemented a demonstration Mocking framework, which I found a very good resource for people who want to figure ou...
What is the difference between a HashMap and a TreeMap? [duplicate]
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To sum up:
HashMap: Lookup-array structure, based on hashCode(), equals() implementations, O(1) runtime complexity for inserting and searching, unsorted
TreeMap: Tree structure, based on compareTo() implementation, O(log(N)) runtime complexity for inserting and searchi...
JOIN queries vs multiple queries
...ral queries? (You run your main query, and then you run many other SELECTs based on the results from your main query)
14 An...
Conditionally ignoring tests in JUnit 4
... like this:
@Test
public void calculateTotalSalary() {
assumeThat(Database.connect(), is(notNull()));
//test code below.
}
Not to mention that it is much easier to capture and use the connection from the Database.connect() method this way.
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