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How to check if a String contains only ASCII?
...c) returns true if the character is a letter. But is there a way to quickly find if a String only contains the base characters of ASCII?
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How to convert / cast long to String?
...'t want to get a 4-letter "null" string, you might use Objects.toString, like: String s = Objects.toString(date, null);
EDIT:
You reverse it using Long l = Long.valueOf(s); but in this direction you need to catch NumberFormatException
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Why are local variables not initialized in Java?
...programmer's decision to set the value of the variable and it should not take a default value. If the programmer, by mistake, did not initialize a local variable and it take default value, then the output could be some unexpected value. So in case of local variables, the compiler will ask the progra...
Is there a version control system for database structure changes?
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In Ruby on Rails, there's a concept of a migration -- a quick script to change the database.
You generate a migration file, which has rules to increase the db version (such as adding a column) and rules to downgrade the version (such as removing a column). Each migration is numbered,...
How do I escape a single quote in SQL Server?
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Recursively list files in Java
...o I recursively list all files under a directory in Java? Does the framework provide any utility?
26 Answers
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Cache an HTTP 'Get' service response in AngularJS?
I want to be able to create a custom AngularJS service that makes an HTTP 'Get' request when its data object is empty and populates the data object on success.
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Binary search (bisection) in Python
...n position
return pos if pos != hi and a[pos] == x else -1 # don't walk off the end
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List the queries running on SQL Server
...ster.dbo.sysprocesses P
where P.spid > 50
and P.status not in ('background', 'sleeping')
and P.cmd not in ('AWAITING COMMAND'
,'MIRROR HANDLER'
,'LAZY WRITER'
,'CHECKPOINT SLEEP'
,'RA MANAGER')
order by batc...
How do I sort a Set to a List in Java?
...into a sorted List . Is there a method in the java.util.Collections package that will do this for me?
10 Answers
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