Defining Classes II - Absolute Java - page 282

Display 5.8 Some Methods in the Class Character (part 2 of 2)

public static boolean isUpperCase( char argument)

Returns true if its argument is an uppercase letter; otherwise returns false.
EXAMPLE
Character.isUpperCase('a') returns true. Character.isUpperCase('a') and
Character.isUpperCase('%') both return false .

public static boolean isLowerCase( char argument)

Returns true if its argument is a lowercase letter; otherwise returns false .
EXAMPLE
Character.isLowerCase('a') returns true. Character.isLowerCase('A') and
Character.isLowerCase('%') both return false .

public static boolean isWhitespace( char argument)

Returns true if its argument is a whitespace character; otherwise returns false . Whitespace
characters are those that print as white space, such as the space character (blank character), the tab
character ('\t'), and the line break character ('\n').
EXAMPLE
Character.isWhitespace(' ') returns true .
Character.isWhitespace('A') returns false .

public static boolean isLetter( char argument)

Returns true if its argument is a letter; otherwise returns false .
EXAMPLE
Character.isLetter('A') returns true . Character.isLetter('%') and
Character.isLetter ('5') both return false .

public static boolean isDigit( char argument)

Returns true if its argument is a digit; otherwise returns false .
EXAMPLE
Character.isDigit('5') returns true . Character.isDigit('A') and
Character.isDigit('%') both return false .

public static boolean isLetterOrDigit( char argument)

Returns true if its argument is a letter or a digit; otherwise returns false .
EXAMPLE
Character.isLetterOrDigit('A') and Character.isLetterOrDigit('5') both return
true . Character.isLetterOrDigit('&') returns false .