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Is there way to check is text file (.txt) encoded with Unicode or UTF-8 with Java?
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Open the file with Notepad++ and will see on the right down corner the encoding table name. And in the menu encoding you can change the encoding table and save the file.
To verify if a file passes an encoding such as ascii, iso-8859-1, utf-8 or whatever then a good solution is to use the 'iconv' command.
Encoding. The ASCII character set is the most common compatible subset of character sets for English-language text files, and is generally assumed to be the default file format in many situations.
You cannot know with absolute certainty which charset is used in the general case. I found this to be a good read.
http://illegalargumentexception.blogspot.co.uk/2009/05/java-rough-guide-to-character-encoding.html
Especially the section Automatic detection of encoding.
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Uhm, theoretically, how would you know if it is unicode?
This is the real question. Truthfully, you cannot know, but you can make a decent guess.
See: Java : How to determine the correct charset encoding of a stream for more details. :)
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