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Why is Class.newInstance() “evil”?
... IDEs allow you to find class usages - it helps during refactoring, if you and your IDE know what code is using class that you plan to change.
When you don't do an explicit usage of the constructor, but use Class.newInstance() instead, you risk not to find that usage during refactoring and this pro...
How to find a parent with a known class in jQuery?
... Very helpful. I always use to do $(this).parent().parent().parent() and i knew there was a better solution.
– Wang'l Pakhrin
Dec 8 '17 at 16:45
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Why do table names in SQL Server start with “dbo”?
...ully qualified name, though there is a slight performance gain in doing so and is considered a best practice. "
– Carl G
Oct 9 '12 at 16:33
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How does Activity.finish() work in Android?
...on. The finish() operation will not even begin until you return control to Android.
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Difference between var_dump,var_export & print_r
What is the difference between var_dump , var_export and print_r ?
2 Answers
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JSR-303 @Valid annotation not working for list of child objects
...sses member of UserAddressesForm with @Valid annotation. See section 3.1.3 and 3.5.1 of JSR 303: Bean Validation. As I explained in my answer to the question Is there a standard way to enable JSR 303 Bean Validation using annotated method, this is the real use of @Valid annotation as per JSR 303.
E...
Show filename and line number in grep output
... to search my rails directory using grep. I am looking for a specific word and I want to grep to print out the file name and line number.
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Why are ToLookup and GroupBy different?
...table with a billion rows in it?
The billion rows are sent over the wire, and you build the lookup table locally.
What happens when you call GroupBy on such an object?
A query object is built; end of story.
When that query object is enumerated then the analysis of the table is done on the databa...
MySQL select with CONCAT condition
I'm trying to compile this in my mind.. i have a table with firstname and lastname fields
and i have a string like "Bob Jones" or "Bob Michael Jones" and several others.
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Is SecureRandom thread safe?
Is SecureRandom thread safe? That is, after initializing it, can access to the next random number be relied on to be thread safe? Examining the source code seems to show that it is, and this bug report seems to indicate that its lack of documentation as thread safe is a javadoc issue. Has anyone...