Character.isLetter

Class Overview | Class Members | This Package | All Packages

Syntax

public static boolean isLetter( char ch )

Parameters

ch: the character to be tested.

Returns

true if the character is a letter; false otherwise.

Description

Determines if the specified character is a letter. For a more complete specification that encompasses all Unicode characters, see Gosling, Joy, and Steele, The Java Language Specification.

A character is considered to be a letter if and only if it is specified to be a letter by the Unicode 2.0 standard (category "Lu", "Ll", "Lt", "Lm", or "Lo" in the Unicode specification data file).

Note that most ideographic characters are considered to be letters (category "Lo") for this purpose.

Note also that not all letters have case: many Unicode characters are letters but are neither uppercase nor lowercase nor titlecase.