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The most sophisticated way for creating comma-separated Strings from a Collection/Array/List?
... was written 11 years ago, but now there are far better options to do this more cleanly in a single line, both using only Java built-in classes or using a utility library. See other answers below.
Since strings are immutable, you may want to use the StringBuilder class if you're going to alter th...
Why shouldn't I use “Hungarian Notation”?
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Designing function f(f(n)) == -n
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How to pattern match using regular expression in Scala?
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How to get the current date without the time?
...DateTime using the Today property:
DateTime today = DateTime.Today;
or more generally, you can use the Date property. For example, if you wanted the UTC date you could use:
DateTime dateTime = DateTime.UtcNow.Date;
It's not very clear whether that's what you need or not though... if you're j...
How to check if a String contains another String in a case insensitive manner in Java?
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is this approach using Pattern more performant than s1.toLowerCase().contains(s2.toLowerCase()) ?
– Rajat Gupta
Aug 9 '12 at 10:24
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Find all files in a directory with extension .txt in Python
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@ghostdog74: In my opinion it would more appropriate to write for file in f than for for files in f since what is in the variable is a single filename. Even better would be to change the f to files and then the for loops could become for file in files.
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Why is there no tuple comprehension in Python?
...ference between using a comprehension and using a constructor+generator is more than subtle if you care about performance. Comprehensions result in faster construction compared to using a generator passed to a constructor. In the latter case you are creating and executing functions and functions are...
Method Overloading for null argument
...cific one.
Since Object is the super-type of char[], the array version is more specific than the Object-version. So if only those two methods exist, the char[] version will be chosen.
When both the char[] and Integer versions are available, then both of them are more specific than Object but none ...
Android: Difference between Parcelable and Serializable?
...arcelable is faster than Serializable interface
Parcelable interface takes more time to implement compared to Serializable interface
Serializable interface is easier to implement
Serializable interface creates a lot of temporary objects and causes quite a bit of garbage collection
Parcelable array ...