大约有 41,000 项符合查询结果（耗时：0.0503秒） [XML]
Getting Java version at runtime
I need to work around a Java bug in JDK 1.5 which was fixed in 1.6. I'm using the following condition:
12 Answers
...
Regex for splitting a string using space when not surrounded by single or double quotes
...plit the example string using all spaces that are not surrounded by single or double quotes. My last attempt looks like this: (?!") and isn't quite working. It's splitting on the space before the quote.
...
Why JSF calls getters multiple times
...uted everytime when the code calls ValueExpression#getValue().
This will normally be invoked one or two times per JSF request-response cycle, depending on whether the component is an input or output component (learn it here). However, this count can get up (much) higher when used in iterating JSF c...
Match two strings in one line with grep
... tried the following but this matches lines that contain either string1 or string2 which not what I want.
21 Answers
...
Why do I get AttributeError: 'NoneType' object has no attribute 'something'?
I keep getting an error that says
10 Answers
10
...
Releasing memory in Python
I have a few related questions regarding memory usage in the following example.
4 Answers
...
Conditions for automatic generation of default/copy/move ctor and copy/move assignment operator?
I want to refresh my memory on the conditions under which a compiler typically auto generates a default constructor, copy constructor and assignment operator.
...
JavaScript checking for null vs. undefined and difference between == and ===
...
How do I check a variable if it's null or undefined...
Is the variable null:
if (a === null)
// or
if (a == null) // but see note below
...but note the latter will also be true if a is undefined.
Is it undefined:
if (typeof a === "undefined")
// or
if (a ==...
What do we mean by Byte array? [closed]
...ay is an array of bytes (tautology FTW!).
You could use a byte array to store a collection of binary data, for example, the contents of a file. The downside to this is that the entire file contents must be loaded into memory.
For large amounts of binary data, it would be better to use a streaming ...
In C#, should I use string.Empty or String.Empty or “” to intitialize a string?
...rue - due to string interning, it will be created either once per assembly or once per AppDomain (or possibly once for the whole process - not sure on that front). This difference is negligible - massively, massively insignificant.
Which you find more readable is a different matter, however. It's s...