Java, Unicode, and supplementary characters question

[Raf Szczypiorski]

Hi, I have code like this:

import javax.swing.JOptionPane;

public class UnicodeTest2 {

    public static void main(String[] args) {
        String s = "\u5B66\uD801\uDC00\u6771";
        int codeUnits = s.length();
        System.out.printf("code units: %d\n", codeUnits);
        int codePoints = s.codePointCount(0, s.length());
        System.out.printf("code points: %d\n", codePoints);
        System.out.println(s);
        JOptionPane.showMessageDialog(null, s);
    }

}

It contains 4 code units: the first and the last areo some Asian chars (found it on the web somewhere), ant the 2 inside comprise a supplementary char. The code prints out what expected: 4 units, 3 points. What I am curious about is that when I display it using Swing, it prints the Asian chars correctly, but it fails for the supplementary char, printing just an empty box. It is no surprise that System.out prints ??? to the console (Vista Home Premium), but why is the middle character not shown correctly? Does it have to do anything with a font not having a glyph for this code point? The code point was taken from here: http://java.sun.com/developer/technicalArticles/Intl/Supplementary/ (scroll a little down, the first table with 4 characters, the last one, kind of an small letter 'a').

Raf

[Ulf Dittmer]

Raf Szczypiorski wrote:Does it have to do anything with a font not having a glyph for this code point?

Possibly. Which font are you using?

[Raf Szczypiorski]

Hmm, I don't know, how can I check that? I haven't changed anything in the swing configuration in any way.

[Ulf Dittmer]

I'm not sure what Swing's default font is, but I'm certain that it doesn't even include all BMP 0 characters, much less anything that's in one of the other BMPs.

Here are fonts that might include those characters: http://www.code2000.net/