大约有 32,000 项符合查询结果（耗时：0.0442秒） [XML]
Why can I throw null in Java? [duplicate]
...f evaluation of the Expression completes normally, producing a null value, then an instance V' of class NullPointerException is created and thrown instead of null. The throw statement then completes abruptly, the reason being a throw with value V'.
...
How to parse XML in Bash?
... you see a '<' character (the -d for deliminator flag). What is read is then split using the IFS and assigned to the variable ENTITY and CONTENT. So take the following:
<tag>value</tag>
The first call to read_dom get an empty string (since the '<' is the first character). That g...
How to use Regular Expressions (Regex) in Microsoft Excel both in-cell and loops
... If so, they are removed and the rest of the string is displayed. If not, then a box appears telling you that no match is found. Cell A1 values of 12abc will return abc, value of 1abc will return abc, value of abc123 will return "Not Matched" because the digits were not at the start of the string....
Understanding how recursive functions work
...es. If you think of it as "many copies of the same function being called", then it may be clearer:
Only one copy of the function ever returns 0, and it's not the first one (it's the last one). So the result of calling the first one is not 0.
For the second bit of confusion, I think it will be easi...
Error in finding last used cell in Excel with VBA
...up reaching the last row in the worksheet! It's like selecting cell A1 and then pressing End key and then pressing Down Arrow key. This will also give you unreliable results if there are blank cells in a range.
CountA is also unreliable because it will give you incorrect result if there are blank c...
Greedy vs. Reluctant vs. Possessive Quantifiers
...er first matches as much as possible. So the .* matches the entire string. Then the matcher tries to match the f following, but there are no characters left. So it "backtracks", making the greedy quantifier match one less character (leaving the "o" at the end of the string unmatched). That still doe...
How do I use CREATE OR REPLACE?
...ing that CREATE OR REPLACE basically means "if the object exists, drop it, then create it either way?"
14 Answers
...
How to recover MySQL database from .myd, .myi, .frm files
...
If these are MyISAM tables, then plopping the .FRM, .MYD, and .MYI files into a database directory (e.g., /var/lib/mysql/dbname) will make that table available. It doesn't have to be the same database as they came from, the same server, the same MySQL v...
How does one make an optional closure in swift?
...nal closure in parentheses. This will properly scope the ? operator.
func then(onFulfilled: ()->(), onReject: (()->())?){
if let callableRjector = onReject {
// do stuff!
}
}
share
|
...
REST authentication and exposing the API key
...ver generate the sign following the same process, if the two sign matches, then the request is authenticated successfully -- so only the sign is passed through the request, not the secret.
share
|
...