20.5

java.lang.Character

THE PACKAGE JAVA.LANG

20.5.16

public static boolean isLetterOrDigit(char ch)

The result is

true

 if and only if the character argument is a letter or digit.

A character is considered to be a letter or digit if and only if it is a defined

Unicode character ( 20.5.10) and its code lies in one of the following ranges:

0030

0039

ISO Latin 1 (and ASCII) digits (

 0 

 9 

)

0041

005A

ISO Latin 1 (and ASCII) uppercase Latin letters (

 A   Z 

)

0061

007A

ISO Latin 1 (and ASCII) lowercase Latin letters (

 a   z 

)

00C0

00D6

ISO Latin 1 supplementary letters

00D8

00F6

ISO Latin 1 supplementary letters

00F8

00FF

ISO Latin 1 supplementary letters

0100

1FFF

Latin extended A, Latin extended B, IPA extensions,

spacing modifier letters, combining diacritical marks, basic

Greek, Greek symbols and Coptic, Cyrillic, Armenian,

Hebrew extended A, Basic Hebrew, Hebrew extended B,

Basic Arabic, Arabic extended, Devanagari, Bengali,

Gurmukhi, Gujarati, Oriya, Tamil, Telugu, Kannada,

Malayalam, Thai, Lao, Basic Georgian, Georgian extended,

Hanguljamo, Latin extended additional, Greek extended

3040

9FFF

Hiragana, Katakana, Bopomofo, Hangul compatibility

Jamo, CJK miscellaneous, enclosed CJK characters and

months, CJK compatibility, Hangul, Hangul

supplementary A, Hangul supplementary B, CJK unified

ideographs

F900

FDFF

CJK compatibility ideographs, alphabetic presentation

forms, Arabic presentation forms A

FE70

FEFE

Arabic presentation forms B

FF10

FF19

Fullwidth digits

FF21

FF3A

Fullwidth Latin uppercase

FF41

FF5A

Fullwidth Latin lowercase

FF66

FFDC

Halfwidth Katakana and Hangul

It follows, then, that for Unicode 1.1.5 as corrected above, the Unicode letters

and digits are exactly those with codes in the following list, which contains both

single codes and inclusive ranges:

 0030

0039

,

0041

005A

,

0061

007A

,

00C0

00D6

,

00D8

00F6

,

00F8

01F5

,

01FA

0217

,

0250

02A8

,

02B0

02DE

,

02E0

02E9

,

0300

0345

,

0360

0361

,

0374

0375

,

037A

,

037E

,

0384

038A

,

038C

,

038E

,

038F

03A1

,

03A3

03CE

,

03D0

03D6

,

03DA

03E2

,

03DA

,

03DC

,

03DE

,

03E0

,

03E2

03F3

,

0401

040C

,

040E

044F

,

0451

045C

,

045E

0486

,

0490

04C4

,

04C7

04C8

,

04CB

04CC

,

04D0

04EB

,

04EE

04F5

,

04F8

04F9

,

0531

0556

,

0559

055F

,

0561

0587

,

0589

,

05B0

05B9

,

05BB

05C3

,

05D0

05EA

,

05F0

05F4

,

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