How to identified given string is double byte characterset using java?

Question

I want to Identify given string is double byte character set or not, using java?

Thanks

score 2 · Accepted Answer · answered Jul 06 '11 at 12:05

2

A String does not have a character set property, in fact, it is always UTF-16 (16 bit used for each char).

answered Jul 06 '11 at 12:05

Andreas Dolk

I think you mean that it's always UTF-16 (though that doesn't always mean that 16 bits is used for each character either) – Adam Batkin Jul 06 '11 at 12:06
@Adam Batkin - yes, my mistake, changed it already and linked it to the java language spec. – Andreas Dolk Jul 06 '11 at 12:07
I have a text field in which a user can enter data in chinese,japanese,English or Korean Languages. So we need to figure out a way to read these double byte characters. – Sameek Mishra Jul 06 '11 at 12:10
@sam the text field will store the character in a *"double byte"* `String` internally. If conversion is needed from a charset to UTF-16, then the component will take care of it. *You* get a `String` in UTF-16 from the textfield. – Andreas Dolk Jul 06 '11 at 12:31
@Andreas_D, you might find the -XX:+UseCompressedStrings option interesting. ;) http://www.oracle.com/technetwork/java/javase/tech/vmoptions-jsp-140102.html – Peter Lawrey Jul 06 '11 at 12:36

score 1 · Answer 2 · answered Jul 06 '11 at 12:51

1

If you wanted to try to discover the likely charset of some input data (e.g. in a file or stream), then the ICU4J CharsetDetector could be used.

But by the time the data is in a String in your code, it is too late.

answered Jul 06 '11 at 12:51

ewan.chalmers

score 0 · Answer 3 · answered Jul 06 '11 at 12:09

0

Your string has multibyte characters if String.codePointCount(int beginIndex, int endIndex) for the whole text range will give not zero result.

answered Jul 06 '11 at 12:09

Gedrox

3 Answers3