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Is null check needed before calling instanceof?
...B b) {
// Overloaded version. Would cause reference ambiguity (compile error)
// if Test.test(null) was called without casting.
// So you need to call Test.test((A)null) or Test.test((B)null).
}
}
So Test.test((A)null) will print a instanceof A: false.)
P.S.: If you are hiring, pl...
What should every programmer know about security? [closed]
...
I suggest reviewing CWE/SANS TOP 25 Most Dangerous Programming Errors. It was updated for 2010 with the promise of regular updates in the future. The 2009 revision is available as well.
From http://cwe.mitre.org/top25/index.html
The 2010 CWE/SANS Top 25 Most Dangerous Programming Erro...
Cannot generate iOS App archive in xcode
... see the hint below to narrow your search to find the library causing this error.
and that was it!
hint: to get an idea of the offending files that's causing your archive to create an archive file rather than an ipa do this:
Select the archive and click the Distribute button.
Select the 'Save...
How to use SharedPreferences in Android to store, fetch and edit values [closed]
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this.getSharedPreferences gives me the following error: The method getSharedPreferences(String, int) is undefined for the type MyActivity
– Si8
Jul 29 '13 at 19:14
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How to delete a character from a string using Python
There is a string, for example. EXAMPLE .
16 Answers
16
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What is that “total” in the very first line after ls -l? [closed]
What is the total in the output of ls -l ?
4 Answers
4
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What optimizations can GHC be expected to perform reliably?
...Right x
As an extended example, take this definition of last:
last [] = error "last: empty list"
last (x:[]) = x
last (x:x2:xs) = last (x2:xs)
We first transform it to
last_nil = error "last: empty list"
last_cons x [] = x
last_cons x (x2:xs) = last (x2:xs)
{-# INLINE last #-}
last [] = last_...
Why can't I see the “Report Data” window when creating reports?
...edy this, I had to:
Exclude the report from my project to stop the build errors
Clean & rebuild my project
Refresh the Data Sources pane & confirm I could see the new fields
Re-include the report and open the report designer with the Data Sources pane pinned in view
(This is the key) Drag...
Java Reflection: How to get the name of a variable?
... answered Mar 19 '12 at 20:27
error_null_pointererror_null_pointer
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Delete all records in a table of MYSQL in phpMyAdmin
...raint in the table then those record will not be deleted and will give the error.
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