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Characterjava.lang

Java 1.0serializable comparable

This class provides an immutable
object wrapper around the primitive char data
type. charValue( ) returns the
char value of a Character
object. The compareTo(
) method
implements the Comparable interface so that
Character objects can be ordered and sorted. The
static methods are the most interesting thing about this class,
however: they categorize char values based on the
categories defined by the Unicode standard. (Some
of the methods are only useful if you have a detailed understanding
of that standard.) Static methods beginning with
"is" test
whether
a character is in a
given category. isDigit(
) , isLetter( ),
isWhitespace( ), isUpperCase( )
and isLowerCase( ) are some of the most useful.
Note that these methods work for any Unicode character, not just with
the familiar Latin letters and Arabic numbers of the ASCII character
set. getType( ) returns
a constant that identifies the category of a character.
getdirectionality(
) returns a separate
DIRECTIONALITY_ constant that specifies the
"directionality category" of a
character.

In addition to testing the category of a character, this class also
defines static methods for converting characters.
toUpperCase( )
returns the uppercase equivalent of the
specified character (or returns the character itself if the character
is uppercase or has no uppercase equivalent). toLowerCase(
) converts instead to lowercase. digit( )
returns the integer equivalent of a given character in a given radix
(or base; for example, use 16 for hexadecimal). It works with any
Unicode digit character, and also (for sufficiently large radix
values) the ASCII letters a-z and A-Z. forDigit(
) returns the ASCII character that
corresponds to the specified value (0-35) for the specified radix.
getNumericValue(
) is similar, but also works with any
Unicode character including those, such as Roman numerals, that
represent numbers but are not decimal digits. Finally, the static
toString( )
method returns a String
of length 1 that contains the specified char
value.

Java 5.0
introduces many new methods to this class
to accommodate
Unicode supplementary characters that use
21 bits and do not fit in a single
char value. The two representations for
these supplementary characters are as an int
codepoint in the range 0 through 0x10ffff, or as a sequence of two
char values known as a
"surrogate pair."
The first char of such a pair should fall in the
"high surrogate" range and the
second char should fall in the
"low surrogate" range.
toChars( ) converts an int
codepoint into one or two char values.
toCodePoint( )
, codePointAt( ),
and codePointBefore( ) convert one or two
char values into the corresponding
int value. codePointCount(
) returns
the number of characters in a char array or
CharSequence, counting surrogate pairs as a single
supplementary character. offsetByCodePoints(
) tells
you how many char indexes to advance in a run of
text if you want to skip over the specified number of code points.
Finally, the various character type testing and case conversion
methods such as isWhitespace( ) and
toUpperCase( ) are available in new versions that
take an int codepoint argument instead of a single
char argument.


Figure 10-9. java.lang.Character

public final class

Character implements Serializable, Comparable<Character> {
// Public Constructors
public

Character (char

value );
// Public Constants

1.1 public static final byte

COMBINING_SPACING_MARK ; =8

1.1 public static final byte

CONNECTOR_PUNCTUATION ; =23

1.1 public static final byte

CONTROL ; =15

1.1 public static final byte

CURRENCY_SYMBOL ; =26

1.1 public static final byte

DASH_PUNCTUATION ; =20

1.1 public static final byte

DECIMAL_DIGIT_NUMBER ; =9

1.4 public static final byte

DIRECTIONALITY_ARABIC_NUMBER ; =6

1.4 public static final byte

DIRECTIONALITY_BOUNDARY_NEUTRAL ; =9

1.4 public static final byte

DIRECTIONALITY_COMMON_NUMBER_SEPARATOR ; =7

1.4 public static final byte

DIRECTIONALITY_EUROPEAN_NUMBER ; =3

1.4 public static final byte

DIRECTIONALITY_EUROPEAN_NUMBER_SEPARATOR ; =4

1.4 public static final byte

DIRECTIONALITY_EUROPEAN_NUMBER_TERMINATOR ; =5

1.4 public static final byte

DIRECTIONALITY_LEFT_TO_RIGHT ; =0

1.4 public static final byte

DIRECTIONALITY_LEFT_TO_RIGHT_EMBEDDING ; =14

1.4 public static final byte

DIRECTIONALITY_LEFT_TO_RIGHT_OVERRIDE ; =15

1.4 public static final byte

DIRECTIONALITY_NONSPACING_MARK ; =8

1.4 public static final byte

DIRECTIONALITY_OTHER_NEUTRALS ; =13

1.4 public static final byte

DIRECTIONALITY_PARAGRAPH_SEPARATOR ; =10

1.4 public static final byte

DIRECTIONALITY_POP_DIRECTIONAL_FORMAT ; =18

1.4 public static final byte

DIRECTIONALITY_RIGHT_TO_LEFT ; =1

1.4 public static final byte

DIRECTIONALITY_RIGHT_TO_LEFT_ARABIC ; =2

1.4 public static final byte

DIRECTIONALITY_RIGHT_TO_LEFT_EMBEDDING ; =16

1.4 public static final byte

DIRECTIONALITY_RIGHT_TO_LEFT_OVERRIDE ; =17

1.4 public static final byte

DIRECTIONALITY_SEGMENT_SEPARATOR ; =11

1.4 public static final byte

DIRECTIONALITY_UNDEFINED ; =-1

1.4 public static final byte

DIRECTIONALITY_WHITESPACE ; =12

1.1 public static final byte

ENCLOSING_MARK ; =7

1.1 public static final byte

END_PUNCTUATION ; =22

1.4 public static final byte

FINAL_QUOTE_PUNCTUATION ; =30

1.1 public static final byte

FORMAT ; =16

1.4 public static final byte

INITIAL_QUOTE_PUNCTUATION ; =29

1.1 public static final byte

LETTER_NUMBER ; =10

1.1 public static final byte

LINE_SEPARATOR ; =13

1.1 public static final byte

LOWERCASE_LETTER ; =2

1.1 public static final byte

MATH_SYMBOL ; =25

5.0 public static final int

MAX_CODE_POINT ; =1114111

5.0 public static final char

MAX_HIGH_SURROGATE ; = \uDBFF

5.0 public static final char

MAX_LOW_SURROGATE ; = \uDFFF
public static final int

MAX_RADIX ; =36

5.0 public static final char

MAX_SURROGATE ; = \uDFFF
public static final char

MAX_VALUE ; = \uFFFF

5.0 public static final int

MIN_CODE_POINT ; =0

5.0 public static final char

MIN_HIGH_SURROGATE ; = \uD800

5.0 public static final char

MIN_LOW_SURROGATE ; = \uDC00
public static final int

MIN_RADIX ; =2

5.0 public static final int

MIN_SUPPLEMENTARY_CODE_POINT ; =65536

5.0 public static final char

MIN_SURROGATE ; = \uD800
public static final char

MIN_VALUE ; = \0

1.1 public static final byte

MODIFIER_LETTER ; =4

1.1 public static final byte

MODIFIER_SYMBOL ; =27

1.1 public static final byte

NON_SPACING_MARK ; =6

1.1 public static final byte

OTHER_LETTER ; =5

1.1 public static final byte

OTHER_NUMBER ; =11

1.1 public static final byte

OTHER_PUNCTUATION ; =24

1.1 public static final byte

OTHER_SYMBOL ; =28

1.1 public static final byte

PARAGRAPH_SEPARATOR ; =14

1.1 public static final byte

PRIVATE_USE ; =18

5.0 public static final int

SIZE ; =16

1.1 public static final byte

SPACE_SEPARATOR ; =12

1.1 public static final byte

START_PUNCTUATION ; =21

1.1 public static final byte

SURROGATE ; =19

1.1 public static final byte

TITLECASE_LETTER ; =3

1.1 public static final Class<Character>

TYPE ;

1.1 public static final byte

UNASSIGNED ; =0

1.1 public static final byte

UPPERCASE_LETTER ; =1
// Nested Types

1.2 public static class

Subset ;

1.2 public static final class

UnicodeBlock extends Character.Subset;
// Public Class Methods

5.0 public static int

charCount (int

codePoint );

5.0 public static int

codePointAt (char[ ]

a , int

index );

5.0 public static int

codePointAt (CharSequence

seq , int

index );

5.0 public static int

codePointAt (char[ ]

a , int

index , int

limit );

5.0 public static int

codePointBefore (CharSequence

seq , int

index );

5.0 public static int

codePointBefore (char[ ]

a , int

index );

5.0 public static int

codePointBefore (char[ ]

a , int

index , int

start );

5.0 public static int

codePointCount (char[ ]

a , int

offset , int

count );

5.0 public static int

codePointCount (CharSequence

seq , int

beginIndex , int

endIndex );

5.0 public static int

digit (int

codePoint , int

radix );
public static int

digit (char

ch , int

radix );
public static char

forDigit (int

digit , int

radix );

1.4 public static byte

getDirectionality (char

ch );

5.0 public static byte

getDirectionality (int

codePoint );

1.1 public static int

getNumericValue (char

ch );

5.0 public static int

getNumericValue (int

codePoint );

1.1 public static int

getType (char

ch );

5.0 public static int

getType (int

codePoint );

5.0 public static boolean

isDefined (int

codePoint );
public static boolean

isDefined (char

ch );

5.0 public static boolean

isDigit (int

codePoint );
public static boolean

isDigit (char

ch );

5.0 public static boolean

isHighSurrogate (char

ch );

5.0 public static boolean

isIdentifierIgnorable (int

codePoint );

1.1 public static boolean

isIdentifierIgnorable (char

ch );

1.1 public static boolean

isISOControl (char

ch );

5.0 public static boolean

isISOControl (int

codePoint );

1.1 public static boolean

isJavaIdentifierPart (char

ch );

5.0 public static boolean

isJavaIdentifierPart (int

codePoint );

1.1 public static boolean

isJavaIdentifierStart (char

ch );

5.0 public static boolean

isJavaIdentifierStart (int

codePoint );
public static boolean

isLetter (char

ch );

5.0 public static boolean

isLetter (int

codePoint );
public static boolean

isLetterOrDigit (char

ch );

5.0 public static boolean

isLetterOrDigit (int

codePoint );

5.0 public static boolean

isLowerCase (int

codePoint );
public static boolean

isLowerCase (char

ch );

5.0 public static boolean

isLowSurrogate (char

ch );

5.0 public static boolean

isMirrored (int

codePoint );

1.4 public static boolean

isMirrored (char

ch );

5.0 public static boolean

isSpaceChar (int

codePoint );

1.1 public static boolean

isSpaceChar (char

ch );

5.0 public static boolean

isSupplementaryCodePoint (int

codePoint );

5.0 public static boolean

isSurrogatePair (char

high , char

low );
public static boolean

isTitleCase (char

ch );

5.0 public static boolean

isTitleCase (int

codePoint );

1.1 public static boolean

isUnicodeIdentifierPart (char

ch );

5.0 public static boolean

isUnicodeIdentifierPart (int

codePoint );

5.0 public static boolean

isUnicodeIdentifierStart (int

codePoint );

1.1 public static boolean

isUnicodeIdentifierStart (char

ch );
public static boolean

isUpperCase (char

ch );

5.0 public static boolean

isUpperCase (int

codePoint );

5.0 public static boolean

isValidCodePoint (int

codePoint );

5.0 public static boolean

isWhitespace (int

codePoint );

1.1 public static boolean

isWhitespace (char

ch );

5.0 public static int

offsetByCodePoints (CharSequence

seq , int

index ,
int

codePointOffset );

5.0 public static int

offsetByCodePoints (char[ ]

a , int

start , int

count ,
int

index , int

codePointOffset );

5.0 public static char

reverseBytes (char

ch );

5.0 public static char[ ]

toChars (int

codePoint );

5.0 public static int

toChars (int

codePoint , char[ ]

dst , int

dstIndex );

5.0 public static int

toCodePoint (char

high , char

low );
public static char

toLowerCase (char

ch );

5.0 public static int

toLowerCase (int

codePoint );

1.4 public static String

toString (char

c );
public static char

toTitleCase (char

ch );

5.0 public static int

toTitleCase (int

codePoint );
public static char

toUpperCase (char

ch );

5.0 public static int

toUpperCase (int

codePoint );

5.0 public static Character

valueOf (char

c );
// Public Instance Methods
public char

charValue ( );
// Methods Implementing Comparable

1.2 public int

compareTo (Character

anotherCharacter );
// Public Methods Overriding Object
public boolean

equals (Object

obj );
public int

hashCode ( );
public String

toString ( );
// Deprecated Public Methods

# public static boolean

isJavaLetter (char

ch );

# public static boolean

isJavaLetterOrDigit (char

ch );

# public static boolean

isSpace (char

ch );
}



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