printable char in java

Question

Does anyone knows how to detect printable characters in java?

After a while ( trial/error ) I get to this method:

    public boolean isPrintableChar( char c ) {         Character.UnicodeBlock block = Character.UnicodeBlock.of( c );         return (!Character.isISOControl(c)) &&                 c != KeyEvent.CHAR_UNDEFINED &&                 block != null &&                 block != Character.UnicodeBlock.SPECIALS;     } 

I'm getting the input via KeyListener and come Ctr-'key' printed an square. With this function seems fairly enough.

Am I missing some char here?

Answer 1

It seems this was the "Font" independent way.

public boolean isPrintableChar( char c ) {     Character.UnicodeBlock block = Character.UnicodeBlock.of( c );     return (!Character.isISOControl(c)) &&             c != KeyEvent.CHAR_UNDEFINED &&             block != null &&             block != Character.UnicodeBlock.SPECIALS; } 

Answer 2

I'm not perfectly sure whether I understand your problem. But if you want detect if character can be drawn to Graphics object, and if not print some placeholder char you might find usefull:

Font.canDisplay(int) 

It will check whether font can display specific codepoint (it is more that check whether font is displayable at all -- since there are chars that are displayable - like ą - but some fonts cant display them.