Tutorials : Avoid the Lesser Known Pitfalls of Localizing Java Applications :

Abbrechen, Wiederholen, Ignorieren?

If your applications employ custom GUI layouts crafted by a professional graphic designer, this can make things much worse than average: even with the power of many Java layout managers at your disposal, you will still have to deal with places where there were exactly 120 pixels available for a form field label, and not a pixel more. A form designed with English labels, fits English text perfectly, and Japanese was okay in most cases. As a rule, German text did not fit at all.

Figure 1. The Size of the Translated Text: Compare the original English button text and the translated ones. Japanese was ok, but I had to decrease the font size for the German text to fit the button.

In this case, translation of text strings to German required several iterations, because the first version was so large that no way to fit it into the GUI layout. With some help, German translators managed to rephrase the text, select shorter synonyms, etc. This required more time than expected, so make sure to add some extra days for this stage on your schedule.

To avoid problems of this kind, read this excellent MSDN article. It states what a developer must think about in order to make future localization easy before starting to write code and design GUI. In particular, the article contains concise, specific recommendations on text sizes and free space reservation.

Printing messages to System.out

Many Swing-based GUI applications also have a command-line interface. In the command-line mode, status messages and errors are printed to the standard output. So you need to translate messages and file names from ANSI to OEM encoding.

As far as I know, there is no Java API to translate a string from ANSI to OEM. I ended up writing a custom native method that invokes the AnsiToOEM() Win32 API function.

Note: Sun is aware of this problem, but does not think it is a big issue. See bugs 4153167, 4038677, and related for details.

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