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What's the best way to check if a String represents an integer in Java?
I normally use the following idiom to check if a String can be converted to an integer.
38 Answers
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Populate a Razor Section From a Partial
...tml.Partial("_Scripts", "ScriptName_For_Partial1")
}
Again, it might not win a beauty prize but it will work.
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Dictionary vs Object - which is more efficient and why?
...ots=3sec obj=11sec dict=12sec namedtuple=16sec. I'm using CPython 2.6.6 on Win7 64bit
– Jonathan
Jul 5 '11 at 13:24
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Why .NET String is immutable? [duplicate]
...nute's extra start-up to save a massive amount of memory was a performance win in the case in question). With mutable objects that can't be done.
No side-effects can come from passing an immutable type as a method to a parameter unless it is out or ref (since that changes the reference, not the obje...
Is the size of C “int” 2 bytes or 4 bytes?
...pends on the operating system running on the machine. For instance long in Win64 is 4 bytes whereas long in Linux64 is 8 bytes.
– Cem Kalyoncu
Jan 10 '15 at 19:05
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A fast method to round a double to a 32-bit int explained
...ll common, using type punning to get an integer out of a double was a huge win (see the benchmarks here, copied from a comment to the OP.) Your version is, of course, simpler. But it doesn't solve the problem of getting that result into an integer variable without the slow cast. (There's also nothin...
Does Java 8 provide a good way to repeat a value or function?
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@jwenting It really depends - typically with GUI stuff (Swing or JavaFX), that removes a lot of boiler plate due to anonymous classes.
– assylias
Aug 30 '13 at 12:12
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Is there a way to get rid of accents and convert a whole string to regular letters?
...ut if you need to do this with a lot of text, pre-compiling the regex is a win.
– David Conrad
Mar 3 '13 at 21:49
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What are the downsides to using Dependency Injection? [closed]
...oing to increase complexity. It's all about balance, which begins with knowing the upsides and downsides. When people say, 'there are no downsides,' it's a sure indicator that they haven't fully understood the thing yet.
– Don Branson
Mar 9 '10 at 18:37
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Calling C++ class methods via a function pointer
...myfunction (arg);.
This kind of thing is fairly common when using the old Win32 APIs, which were originally designed for C rather than C++. Of course in that case, the parameter is normally LPARAM or similar rather than a pointer, and some casting is needed.
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