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From: Fredrik Jonson <fredrik@jonson.org>
Newsgroups: comp.lang.java.programmer
Subject: Re: Font evolution
Date: 3 Mar 2013 18:48:39 GMT
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John B. Matthews wrote:

>  Roedy Green <see_website@mindprod.com.invalid> wrote:
> 
> > What happens in Java apps when a glyph is missing from the
> > specified font?
> 
>  I think you're supposed to see a WHITE SQUARE, which "may be 
>  used to represent a missing ideograph."

I don't do Java GUI programming very often, but in logs and terminals I
regularily stumble upon U+FFFD in output from java code with broken charset
conversion. U+FFFD is the unicode replacement character and is represented
by a black rhomb with a white question mark inside.

https://en.wikipedia.org/wiki/U%2BFFFD

class Sscce {
    static public void main(String[] arg) {
        String foo = new String(new byte[] { (byte) -1 });
        javax.swing.JOptionPane.showMessageDialog(null, foo);
    }
}

Granted, I'm not sure it is entirely correct to equate a missing ideograph
with a unrepresentable chacacter?

-- 
Fredrik Jonson