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Why does String.valueOf(null) throw a NullPointerException?
...n in this case, it then throws NullPointerException.
The easy "fix" is to cast the null explicitly to Object as follows:
System.out.println(String.valueOf((Object) null));
// prints "null"
Related questions
How does polymorph ambiguity distinction work?
Which overload will get selected for nul...
Convert ArrayList to String[] array [duplicate]
...ation as to what is going on here, the JVM doesn't know how to blindly downcast Object[] (the result of toArray()) to String[]. To let it know what your desired object type is, you can pass a typed array into toArray(). The typed array can be of any size (new String[1] is valid), but if it is too sm...
How do I query between two dates using MySQL?
...
When using Date and Time values, you must cast the fields as DateTime and not Date.
Try :
SELECT * FROM `objects`
WHERE (CAST(date_field AS DATETIME)
BETWEEN CAST('2010-09-29 10:15:55' AS DATETIME) AND CAST('2010-01-30 14:15:55' AS DATETIME))
...
Removing leading zeroes from a field in a SQL statement
...@LeadingZeros) = 1 THEN
@LeadingZeros
ELSE
CAST(CAST(@LeadingZeros AS INT) AS VARCHAR(10))
END
SELECT @LeadingZeros
Or you can simply call
CAST(CAST(@LeadingZeros AS INT) AS VARCHAR(10))
...
How to enumerate an enum
...reach (Suit suit in (Suit[]) Enum.GetValues(typeof(Suit)))
{
}
Note: The cast to (Suit[]) is not strictly necessary, but it does make the code 0.5 ns faster.
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Remove useless zero digits from decimals in PHP
... + 0; // 125
echo 966.70 + 0; // 966.7
Internally, this is equivalent to casting to float with (float)$num or floatval($num) but I find it simpler.
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What is the JavaScript >>> operator and how do you use it?
...ctly duplicates what the ECMAScript Fifth Edition standard says, you would cast the number to 32-bit unsigned int like this.
(In reality there's little practical need for this as hopefully people aren't going to be setting array.length to 0.5, -1, 1e21 or 'LEMONS'. But this is JavaScript authors we...
LPCSTR, LPCTSTR and LPTSTR
...ly pointer)
2) convert that read-only pointer into a writeable pointer by casting away its const-ness.
It depends what dispinfo is used for whether or not there is a chance that your ListView call will end up trying to write through that pszText. If it does, this is a potentially very bad thing: a...
How to get whole and decimal part of a number?
...
As a side, intval() or simple casting as (int) might be more performant than floor()
– Jason McCreary
Jul 8 '11 at 2:36
1
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Fixing “Lock wait timeout exceeded; try restarting transaction” for a 'stuck" Mysql table?
From a script I sent a query like this thousands of times to my local database:
13 Answers
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