大约有 38,000 项符合查询结果（耗时：0.0403秒） [XML]
Check a collection size with JSTL
...ly using a too old EL version. You'll need JSTL fn:length() function then. From the documentation:
length( java.lang.Object) - Returns the number of items in a collection, or the number of characters in a string.
Put this at the top of JSP page to allow the fn namespace:
<%@ taglib prefix="fn" ...
Using sed and grep/egrep to search and replace
...or this kind of one-liners, especially to "write it back to where it comes from" (perl's -i switch does it for you, and optionally also lets you keep the old version around e.g. with a .bak appended, just use -i.bak instead).
perl -i.bak -pe 's/\.jpg|\.png|\.gif/.jpg/
rather than intricate work i...
How to get a substring of text?
...ast (source code)
'1234567890'.last(2) # => "90"
alternatively check from/to (source code):
"hello".from(1).to(-2) # => "ell"
share
|
improve this answer
|
follow
...
What is the easiest/best/most correct way to iterate through the characters of a string in Java?
...ntioned in doc:
Returns a stream of int zero-extending the char values from this
sequence. Any char which maps to a surrogate code point is passed
through uninterpreted. If the sequence is mutated while the stream is
being read, the result is undefined.
The method codePoints() also retur...
How do I get a human-readable file size in bytes abbreviation using .NET?
... @Petoj it does not depend on the OS, the definition is OS-agnostic. From Wikipedia: The unit was established by the International Electrotechnical Commission (IEC) in 1998 and has been accepted for use by all major standards organizations
– ANeves thinks SE is evil
...
Why use String.Format? [duplicate]
...p it, since Concat can create an internal buffer of exactly the right size from the start. A SB is used when you have some sort of loop or other control block such that the number of strings being concatted isn't known by the compiler at compile time.
– Servy
...
emacs zoom in/zoom out
...
It seems that the minus must be from the typewriter keys, not the numeric keypad.
– Viesturs
Apr 2 '18 at 9:57
add a comment
...
What are the lesser known but useful data structures?
...indow has focused.
Amazingly, you can derive them by applying techniques from calculus to the type of the original data structure!
share
edited Jul 23 '10 at 3:01
...
How to get a reference to a module inside the module itself?
How can I get a reference to a module from within that module? Also, how can I get a reference to the package containing that module?
...
Implementing INotifyPropertyChanged - does a better way exist?
...n't huge; it can also be used as a base-class if you want. The bool return from SetField tells you if it was a no-op, in case you want to apply other logic.
or even easier with C# 5:
protected bool SetField<T>(ref T field, T value,
[CallerMemberName] string propertyName = null)
{...}
whi...