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JavaTM 2 Platform Std. Ed. v1.4.2 |
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java.lang.Objectjava.lang.Character
The Character class wraps a value of the primitive
type char in an object. An object of type
Character contains a single field whose type is
char.
In addition, this class provides several methods for determining a character's category (lowercase letter, digit, etc.) and for converting characters from uppercase to lowercase and vice versa.
Character information is based on the Unicode Standard, version 3.0.
The methods and data of class Character are defined by
the information in the UnicodeData file that is part of the
Unicode Character Database maintained by the Unicode
Consortium. This file specifies various properties including name
and general category for every defined Unicode code point or
character range.
The file and its description are available from the Unicode Consortium at:
| Nested Class Summary | |
static class |
Character.Subset
Instances of this class represent particular subsets of the Unicode character set. |
static class |
Character.UnicodeBlock
A family of character subsets representing the character blocks in the Unicode specification. |
| Field Summary | |
static byte |
COMBINING_SPACING_MARK
General category "Mc" in the Unicode specification. |
static byte |
CONNECTOR_PUNCTUATION
General category "Pc" in the Unicode specification. |
static byte |
CONTROL
General category "Cc" in the Unicode specification. |
static byte |
CURRENCY_SYMBOL
General category "Sc" in the Unicode specification. |
static byte |
DASH_PUNCTUATION
General category "Pd" in the Unicode specification. |
static byte |
DECIMAL_DIGIT_NUMBER
General category "Nd" in the Unicode specification. |
static byte |
DIRECTIONALITY_ARABIC_NUMBER
Weak bidirectional character type "AN" in the Unicode specification. |
static byte |
DIRECTIONALITY_BOUNDARY_NEUTRAL
Weak bidirectional character type "BN" in the Unicode specification. |
static byte |
DIRECTIONALITY_COMMON_NUMBER_SEPARATOR
Weak bidirectional character type "CS" in the Unicode specification. |
static byte |
DIRECTIONALITY_EUROPEAN_NUMBER
Weak bidirectional character type "EN" in the Unicode specification. |
static byte |
DIRECTIONALITY_EUROPEAN_NUMBER_SEPARATOR
Weak bidirectional character type "ES" in the Unicode specification. |
static byte |
DIRECTIONALITY_EUROPEAN_NUMBER_TERMINATOR
Weak bidirectional character type "ET" in the Unicode specification. |
static byte |
DIRECTIONALITY_LEFT_TO_RIGHT
Strong bidirectional character type "L" in the Unicode specification. |
static byte |
DIRECTIONALITY_LEFT_TO_RIGHT_EMBEDDING
Strong bidirectional character type "LRE" in the Unicode specification. |
static byte |
DIRECTIONALITY_LEFT_TO_RIGHT_OVERRIDE
Strong bidirectional character type "LRO" in the Unicode specification. |
static byte |
DIRECTIONALITY_NONSPACING_MARK
Weak bidirectional character type "NSM" in the Unicode specification. |
static byte |
DIRECTIONALITY_OTHER_NEUTRALS
Neutral bidirectional character type "ON" in the Unicode specification. |
static byte |
DIRECTIONALITY_PARAGRAPH_SEPARATOR
Neutral bidirectional character type "B" in the Unicode specification. |
static byte |
DIRECTIONALITY_POP_DIRECTIONAL_FORMAT
Weak bidirectional character type "PDF" in the Unicode specification. |
static byte |
DIRECTIONALITY_RIGHT_TO_LEFT
Strong bidirectional character type "R" in the Unicode specification. |
static byte |
DIRECTIONALITY_RIGHT_TO_LEFT_ARABIC
Strong bidirectional character type "AL" in the Unicode specification. |
static byte |
DIRECTIONALITY_RIGHT_TO_LEFT_EMBEDDING
Strong bidirectional character type "RLE" in the Unicode specification. |
static byte |
DIRECTIONALITY_RIGHT_TO_LEFT_OVERRIDE
Strong bidirectional character type "RLO" in the Unicode specification. |
static byte |
DIRECTIONALITY_SEGMENT_SEPARATOR
Neutral bidirectional character type "S" in the Unicode specification. |
static byte |
DIRECTIONALITY_UNDEFINED
Undefined bidirectional character type. |
static byte |
DIRECTIONALITY_WHITESPACE
Neutral bidirectional character type "WS" in the Unicode specification. |
static byte |
ENCLOSING_MARK
General category "Me" in the Unicode specification. |
static byte |
END_PUNCTUATION
General category "Pe" in the Unicode specification. |
static byte |
FINAL_QUOTE_PUNCTUATION
General category "Pf" in the Unicode specification. |
static byte |
FORMAT
General category "Cf" in the Unicode specification. |
static byte |
INITIAL_QUOTE_PUNCTUATION
General category "Pi" in the Unicode specification. |
static byte |
LETTER_NUMBER
General category "Nl" in the Unicode specification. |
static byte |
LINE_SEPARATOR
General category "Zl" in the Unicode specification. |
static byte |
LOWERCASE_LETTER
General category "Ll" in the Unicode specification. |
static byte |
MATH_SYMBOL
General category "Sm" in the Unicode specification. |
static int |
MAX_RADIX
The maximum radix available for conversion to and from strings. |
static char |
MAX_VALUE
The constant value of this field is the largest value of type char, '\uFFFF'. |
static int |
MIN_RADIX
The minimum radix available for conversion to and from strings. |
static char |
MIN_VALUE
The constant value of this field is the smallest value of type char, '\u0000'. |
static byte |
MODIFIER_LETTER
General category "Lm" in the Unicode specification. |
static byte |
MODIFIER_SYMBOL
General category "Sk" in the Unicode specification. |
static byte |
NON_SPACING_MARK
General category "Mn" in the Unicode specification. |
static byte |
OTHER_LETTER
General category "Lo" in the Unicode specification. |
static byte |
OTHER_NUMBER
General category "No" in the Unicode specification. |
static byte |
OTHER_PUNCTUATION
General category "Po" in the Unicode specification. |
static byte |
OTHER_SYMBOL
General category "So" in the Unicode specification. |
static byte |
PARAGRAPH_SEPARATOR
General category "Zp" in the Unicode specification. |
static byte |
PRIVATE_USE
General category "Co" in the Unicode specification. |
static byte |
SPACE_SEPARATOR
General category "Zs" in the Unicode specification. |
static byte |
START_PUNCTUATION
General category "Ps" in the Unicode specification. |
static byte |
SURROGATE
General category "Cs" in the Unicode specification. |
static byte |
TITLECASE_LETTER
General category "Lt" in the Unicode specification. |
static Class |
TYPE
The Class instance representing the primitive type
char. |
static byte |
UNASSIGNED
General category "Cn" in the Unicode specification. |
static byte |
UPPERCASE_LETTER
General category "Lu" in the Unicode specification. |
| Constructor Summary | |
Character(char value)
Constructs a newly allocated Character object that
represents the specified char value. |
|
| Method Summary | |
char |
charValue()
Returns the value of this Character object. |
int |
compareTo(Character anotherCharacter)
Compares two Character objects numerically. |
int |
compareTo(Object o)
Compares this Character object to another object. |
static int |
digit(char ch,
int radix)
Returns the numeric value of the character ch in the
specified radix. |
boolean |
equals(Object obj)
Compares this object against the specified object. |
static char |
forDigit(int digit,
int radix)
Determines the character representation for a specific digit in the specified radix. |
static byte |
getDirectionality(char ch)
Returns the Unicode directionality property for the given character. |
static int |
getNumericValue(char ch)
Returns the int value that the specified Unicode
character represents. |
static int |
getType(char ch)
Returns a value indicating a character's general category. |
int |
hashCode()
Returns a hash code for this Character. |
static boolean |
isDefined(char ch)
Determines if a character is defined in Unicode. |
static boolean |
isDigit(char ch)
Determines if the specified character is a digit. |
static boolean |
isIdentifierIgnorable(char ch)
Determines if the specified character should be regarded as an ignorable character in a Java identifier or a Unicode identifier. |
static boolean |
isISOControl(char ch)
Determines if the specified character is an ISO control character. |
static boolean |
isJavaIdentifierPart(char ch)
Determines if the specified character may be part of a Java identifier as other than the first character. |
static boolean |
isJavaIdentifierStart(char ch)
Determines if the specified character is permissible as the first character in a Java identifier. |
static boolean |
isJavaLetter(char ch)
Deprecated. Replaced by isJavaIdentifierStart(char). |
static boolean |
isJavaLetterOrDigit(char ch)
Deprecated. Replaced by isJavaIdentifierPart(char). |
static boolean |
isLetter(char ch)
Determines if the specified character is a letter. |
static boolean |
isLetterOrDigit(char ch)
Determines if the specified character is a letter or digit. |
static boolean |
isLowerCase(char ch)
Determines if the specified character is a lowercase character. |
static boolean |
isMirrored(char ch)
Determines whether the character is mirrored according to the Unicode specification. |
static boolean |
isSpace(char ch)
Deprecated. Replaced by isWhitespace(char). |
static boolean |
isSpaceChar(char ch)
Determines if the specified character is a Unicode space character. |
static boolean |
isTitleCase(char ch)
Determines if the specified character is a titlecase character. |
static boolean |
isUnicodeIdentifierPart(char ch)
Determines if the specified character may be part of a Unicode identifier as other than the first character. |
static boolean |
isUnicodeIdentifierStart(char ch)
Determines if the specified character is permissible as the first character in a Unicode identifier. |
static boolean |
isUpperCase(char ch)
Determines if the specified character is an uppercase character. |
static boolean |
isWhitespace(char ch)
Determines if the specified character is white space according to Java. |
static char |
toLowerCase(char ch)
Converts the character argument to lowercase using case mapping information from the UnicodeData file. |
String |
toString()
Returns a String object representing this
Character's value. |
static String |
toString(char c)
Returns a String object representing the
specified char. |
static char |
toTitleCase(char ch)
Converts the character argument to titlecase using case mapping information from the UnicodeData file. |
static char |
toUpperCase(char ch)
Converts the character argument to uppercase using case mapping information from the UnicodeData file. |
| Methods inherited from class java.lang.Object |
clone, finalize, getClass, notify, notifyAll, wait, wait, wait |
| Field Detail |
public static final int MIN_RADIX
digit method, the forDigit
method, and the toString method of class
Integer.
digit(char, int),
forDigit(int, int),
Integer.toString(int, int),
Integer.valueOf(java.lang.String),
Constant Field Valuespublic static final int MAX_RADIX
digit method, the forDigit
method, and the toString method of class
Integer.
digit(char, int),
forDigit(int, int),
Integer.toString(int, int),
Integer.valueOf(java.lang.String),
Constant Field Valuespublic static final char MIN_VALUE
char, '\u0000'.
public static final char MAX_VALUE
char, '\uFFFF'.
public static final Class TYPE
Class instance representing the primitive type
char.
public static final byte UNASSIGNED
public static final byte UPPERCASE_LETTER
public static final byte LOWERCASE_LETTER
public static final byte TITLECASE_LETTER
public static final byte MODIFIER_LETTER
public static final byte OTHER_LETTER
public static final byte NON_SPACING_MARK
public static final byte ENCLOSING_MARK
public static final byte COMBINING_SPACING_MARK
public static final byte DECIMAL_DIGIT_NUMBER
public static final byte LETTER_NUMBER
public static final byte OTHER_NUMBER
public static final byte SPACE_SEPARATOR
public static final byte LINE_SEPARATOR
public static final byte PARAGRAPH_SEPARATOR
public static final byte CONTROL
public static final byte FORMAT
public static final byte PRIVATE_USE
public static final byte SURROGATE
public static final byte DASH_PUNCTUATION
public static final byte START_PUNCTUATION
public static final byte END_PUNCTUATION
public static final byte CONNECTOR_PUNCTUATION
public static final byte OTHER_PUNCTUATION
public static final byte MATH_SYMBOL
public static final byte CURRENCY_SYMBOL
public static final byte MODIFIER_SYMBOL
public static final byte OTHER_SYMBOL
public static final byte INITIAL_QUOTE_PUNCTUATION
public static final byte FINAL_QUOTE_PUNCTUATION
public static final byte DIRECTIONALITY_UNDEFINED
char
values have undefined directionality in the Unicode specification.
public static final byte DIRECTIONALITY_LEFT_TO_RIGHT
public static final byte DIRECTIONALITY_RIGHT_TO_LEFT
public static final byte DIRECTIONALITY_RIGHT_TO_LEFT_ARABIC
public static final byte DIRECTIONALITY_EUROPEAN_NUMBER
public static final byte DIRECTIONALITY_EUROPEAN_NUMBER_SEPARATOR
public static final byte DIRECTIONALITY_EUROPEAN_NUMBER_TERMINATOR
public static final byte DIRECTIONALITY_ARABIC_NUMBER
public static final byte DIRECTIONALITY_COMMON_NUMBER_SEPARATOR
public static final byte DIRECTIONALITY_NONSPACING_MARK
public static final byte DIRECTIONALITY_BOUNDARY_NEUTRAL
public static final byte DIRECTIONALITY_PARAGRAPH_SEPARATOR
public static final byte DIRECTIONALITY_SEGMENT_SEPARATOR
public static final byte DIRECTIONALITY_WHITESPACE
public static final byte DIRECTIONALITY_OTHER_NEUTRALS
public static final byte DIRECTIONALITY_LEFT_TO_RIGHT_EMBEDDING
public static final byte DIRECTIONALITY_LEFT_TO_RIGHT_OVERRIDE
public static final byte DIRECTIONALITY_RIGHT_TO_LEFT_EMBEDDING
public static final byte DIRECTIONALITY_RIGHT_TO_LEFT_OVERRIDE
public static final byte DIRECTIONALITY_POP_DIRECTIONAL_FORMAT
| Constructor Detail |
public Character(char value)
Character object that
represents the specified char value.
value - the value to be represented by the
Character object.| Method Detail |
public char charValue()
Character object.
char value represented by
this object.public int hashCode()
Character.
hashCode in class ObjectObject.equals(java.lang.Object),
Hashtablepublic boolean equals(Object obj)
true if and only if the argument is not
null and is a Character object that
represents the same char value as this object.
equals in class Objectobj - the object to compare with.
true if the objects are the same;
false otherwise.Object.hashCode(),
Hashtablepublic String toString()
String object representing this
Character's value. The result is a string of
length 1 whose sole component is the primitive
char value represented by this
Character object.
toString in class Objectpublic static String toString(char c)
String object representing the
specified char. The result is a string of length
1 consisting solely of the specified char.
c - the char to be converted
charpublic static boolean isLowerCase(char ch)
A character is lowercase if its general category type, provided
by Character.getType(ch), is
LOWERCASE_LETTER.
The following are examples of lowercase characters:
a b c d e f g h i j k l m n o p q r s t u v w x y z '\u00DF' '\u00E0' '\u00E1' '\u00E2' '\u00E3' '\u00E4' '\u00E5' '\u00E6' '\u00E7' '\u00E8' '\u00E9' '\u00EA' '\u00EB' '\u00EC' '\u00ED' '\u00EE' '\u00EF' '\u00F0' '\u00F1' '\u00F2' '\u00F3' '\u00F4' '\u00F5' '\u00F6' '\u00F8' '\u00F9' '\u00FA' '\u00FB' '\u00FC' '\u00FD' '\u00FE' '\u00FF'
Many other Unicode characters are lowercase too.
ch - the character to be tested.
true if the character is lowercase;
false otherwise.isLowerCase(char),
isTitleCase(char),
toLowerCase(char),
getType(char)public static boolean isUpperCase(char ch)
A character is uppercase if its general category type, provided by
Character.getType(ch), is UPPERCASE_LETTER.
The following are examples of uppercase characters:
A B C D E F G H I J K L M N O P Q R S T U V W X Y Z '\u00C0' '\u00C1' '\u00C2' '\u00C3' '\u00C4' '\u00C5' '\u00C6' '\u00C7' '\u00C8' '\u00C9' '\u00CA' '\u00CB' '\u00CC' '\u00CD' '\u00CE' '\u00CF' '\u00D0' '\u00D1' '\u00D2' '\u00D3' '\u00D4' '\u00D5' '\u00D6' '\u00D8' '\u00D9' '\u00DA' '\u00DB' '\u00DC' '\u00DD' '\u00DE'
Many other Unicode characters are uppercase too.
ch - the character to be tested.
true if the character is uppercase;
false otherwise.isLowerCase(char),
isTitleCase(char),
toUpperCase(char),
getType(char)public static boolean isTitleCase(char ch)
A character is a titlecase character if its general
category type, provided by Character.getType(ch),
is TITLECASE_LETTER.
Some characters look like pairs of Latin letters. For example, there is an uppercase letter that looks like "LJ" and has a corresponding lowercase letter that looks like "lj". A third form, which looks like "Lj", is the appropriate form to use when rendering a word in lowercase with initial capitals, as for a book title.
These are some of the Unicode characters for which this method returns
true:
LATIN CAPITAL LETTER D WITH SMALL LETTER Z WITH CARON
LATIN CAPITAL LETTER L WITH SMALL LETTER J
LATIN CAPITAL LETTER N WITH SMALL LETTER J
LATIN CAPITAL LETTER D WITH SMALL LETTER Z
Many other Unicode characters are titlecase too.
ch - the character to be tested.
true if the character is titlecase;
false otherwise.isLowerCase(char),
isUpperCase(char),
toTitleCase(char),
getType(char)public static boolean isDigit(char ch)
A character is a digit if its general category type, provided
by Character.getType(ch), is
DECIMAL_DIGIT_NUMBER.
Some Unicode character ranges that contain digits:
'\u0030' through '\u0039',
ISO-LATIN-1 digits ('0' through '9')
'\u0660' through '\u0669',
Arabic-Indic digits
'\u06F0' through '\u06F9',
Extended Arabic-Indic digits
'\u0966' through '\u096F',
Devanagari digits
'\uFF10' through '\uFF19',
Fullwidth digits
ch - the character to be tested.
true if the character is a digit;
false otherwise.digit(char, int),
forDigit(int, int),
getType(char)public static boolean isDefined(char ch)
A character is defined if at least one of the following is true:
ch - the character to be tested
true if the character has a defined meaning
in Unicode; false otherwise.isDigit(char),
isLetter(char),
isLetterOrDigit(char),
isLowerCase(char),
isTitleCase(char),
isUpperCase(char)public static boolean isLetter(char ch)
A character is considered to be a letter if its general
category type, provided by Character.getType(ch),
is any of the following:
UPPERCASE_LETTER
LOWERCASE_LETTER
TITLECASE_LETTER
MODIFIER_LETTER
OTHER_LETTER
ch - the character to be tested.
true if the character is a letter;
false otherwise.isDigit(char),
isJavaIdentifierStart(char),
isJavaLetter(char),
isJavaLetterOrDigit(char),
isLetterOrDigit(char),
isLowerCase(char),
isTitleCase(char),
isUnicodeIdentifierStart(char),
isUpperCase(char)public static boolean isLetterOrDigit(char ch)
A character is considered to be a letter or digit if either
Character.isLetter(char ch) or
Character.isDigit(char ch) returns
true for the character.
ch - the character to be tested.
true if the character is a letter or digit;
false otherwise.isDigit(char),
isJavaIdentifierPart(char),
isJavaLetter(char),
isJavaLetterOrDigit(char),
isLetter(char),
isUnicodeIdentifierPart(char)public static boolean isJavaLetter(char ch)
A character may start a Java identifier if and only if one of the following is true:
isLetter(ch) returns true
getType(ch) returns LETTER_NUMBER
ch - the character to be tested.
true if the character may start a Java
identifier; false otherwise.isJavaLetterOrDigit(char),
isJavaIdentifierStart(char),
isJavaIdentifierPart(char),
isLetter(char),
isLetterOrDigit(char),
isUnicodeIdentifierStart(char)public static boolean isJavaLetterOrDigit(char ch)
A character may be part of a Java identifier if and only if any of the following are true:
'$')
'_')
isIdentifierIgnorable returns
true for the character.
ch - the character to be tested.
true if the character may be part of a
Java identifier; false otherwise.isJavaLetter(char),
isJavaIdentifierStart(char),
isJavaIdentifierPart(char),
isLetter(char),
isLetterOrDigit(char),
isUnicodeIdentifierPart(char),
isIdentifierIgnorable(char)public static boolean isJavaIdentifierStart(char ch)
A character may start a Java identifier if and only if one of the following conditions is true:
isLetter(ch) returns true
getType(ch) returns LETTER_NUMBER
ch - the character to be tested.
true if the character may start a Java identifier;
false otherwise.isJavaIdentifierPart(char),
isLetter(char),
isUnicodeIdentifierStart(char)public static boolean isJavaIdentifierPart(char ch)
A character may be part of a Java identifier if any of the following are true:
'$')
'_')
isIdentifierIgnorable returns
true for the character
ch - the character to be tested.
true if the character may be part of a
Java identifier; false otherwise.isIdentifierIgnorable(char),
isJavaIdentifierStart(char),
isLetterOrDigit(char),
isUnicodeIdentifierPart(char)public static boolean isUnicodeIdentifierStart(char ch)
A character may start a Unicode identifier if and only if one of the following conditions is true:
isLetter(ch) returns true
getType(ch) returns
LETTER_NUMBER.
ch - the character to be tested.
true if the character may start a Unicode
identifier; false otherwise.isJavaIdentifierStart(char),
isLetter(char),
isUnicodeIdentifierPart(char)public static boolean isUnicodeIdentifierPart(char ch)
A character may be part of a Unicode identifier if and only if one of the following statements is true:
'_')
isIdentifierIgnorable returns
true for this character.
ch - the character to be tested.
true if the character may be part of a
Unicode identifier; false otherwise.isIdentifierIgnorable(char),
isJavaIdentifierPart(char),
isLetterOrDigit(char),
isUnicodeIdentifierStart(char)public static boolean isIdentifierIgnorable(char ch)
The following Unicode characters are ignorable in a Java identifier or a Unicode identifier:
'\u0000' through '\u0008'
'\u000E' through '\u001B'
'\u007F' through '\u009F'
FORMAT general
category value
ch - the character to be tested.
true if the character is an ignorable control
character that may be part of a Java or Unicode identifier;
false otherwise.isJavaIdentifierPart(char),
isUnicodeIdentifierPart(char)public static char toLowerCase(char ch)
Note that
Character.isLowerCase(Character.toLowerCase(ch))
does not always return true for some ranges of
characters, particularly those that are symbols or ideographs.
ch - the character to be converted.
isLowerCase(char),
isUpperCase(char),
toTitleCase(char),
toUpperCase(char)public static char toUpperCase(char ch)
Note that
Character.isUpperCase(Character.toUpperCase(ch))
does not always return true for some ranges of
characters, particularly those that are symbols or ideographs.
ch - the character to be converted.
isLowerCase(char),
isUpperCase(char),
toLowerCase(char),
toTitleCase(char)public static char toTitleCase(char ch)
char argument is already a titlecase
char, the same char value will be
returned.
Note that
Character.isTitleCase(Character.toTitleCase(ch))
does not always return true for some ranges of
characters.
ch - the character to be converted.
isTitleCase(char),
toLowerCase(char),
toUpperCase(char)
public static int digit(char ch,
int radix)
ch in the
specified radix.
If the radix is not in the range MIN_RADIX <=
radix <= MAX_RADIX or if the
value of ch is not a valid digit in the specified
radix, -1 is returned. A character is a valid digit
if at least one of the following is true:
isDigit is true of the character
and the Unicode decimal digit value of the character (or its
single-character decomposition) is less than the specified radix.
In this case the decimal digit value is returned.
'A' through 'Z' and its code is less than
radix + 'A' - 10.
In this case, ch - 'A' + 10
is returned.
'a' through 'z' and its code is less than
radix + 'a' - 10.
In this case, ch - 'a' + 10
is returned.
ch - the character to be converted.radix - the radix.
forDigit(int, int),
isDigit(char)public static int getNumericValue(char ch)
int value that the specified Unicode
character represents. For example, the character
'\u216C' (the roman numeral fifty) will return
an int with a value of 50.
The letters A-Z in their uppercase ('\u0041' through
'\u005A'), lowercase
('\u0061' through '\u007A'), and
full width variant ('\uFF21' through
'\uFF3A' and '\uFF41' through
'\uFF5A') forms have numeric values from 10
through 35. This is independent of the Unicode specification,
which does not assign numeric values to these char
values.
If the character does not have a numeric value, then -1 is returned. If the character has a numeric value that cannot be represented as a nonnegative integer (for example, a fractional value), then -2 is returned.
ch - the character to be converted.
int
value; -2 if the character has a numeric value that is not a
nonnegative integer; -1 if the character has no numeric value.forDigit(int, int),
isDigit(char)public static boolean isSpace(char ch)
true for the following five
characters only:
'\t' | '\u0009' |
HORIZONTAL TABULATION |
'\n' | '\u000A' |
NEW LINE |
'\f' | '\u000C' |
FORM FEED |
'\r' | '\u000D' |
CARRIAGE RETURN |
' ' | '\u0020' |
SPACE |
ch - the character to be tested.
true if the character is ISO-LATIN-1 white
space; false otherwise.isSpaceChar(char),
isWhitespace(char)public static boolean isSpaceChar(char ch)
SPACE_SEPARATOR
LINE_SEPARATOR
PARAGRAPH_SEPARATOR
ch - the character to be tested.
true if the character is a space character;
false otherwise.isWhitespace(char)public static boolean isWhitespace(char ch)
SPACE_SEPARATOR,
LINE_SEPARATOR, or PARAGRAPH_SEPARATOR)
but is not also a non-breaking space ('\u00A0',
'\u2007', '\u202F').
'\u0009', HORIZONTAL TABULATION.
'\u000A', LINE FEED.
'\u000B', VERTICAL TABULATION.
'\u000C', FORM FEED.
'\u000D', CARRIAGE RETURN.
'\u001C', FILE SEPARATOR.
'\u001D', GROUP SEPARATOR.
'\u001E', RECORD SEPARATOR.
'\u001F', UNIT SEPARATOR.
ch - the character to be tested.
true if the character is a Java whitespace
character; false otherwise.isSpaceChar(char)public static boolean isISOControl(char ch)
'\u0000'
through '\u001F' or in the range
'\u007F' through '\u009F'.
ch - the character to be tested.
true if the character is an ISO control character;
false otherwise.isSpaceChar(char),
isWhitespace(char)public static int getType(char ch)
ch - the character to be tested.
int representing the
character's general category.COMBINING_SPACING_MARK,
CONNECTOR_PUNCTUATION,
CONTROL,
CURRENCY_SYMBOL,
DASH_PUNCTUATION,
DECIMAL_DIGIT_NUMBER,
ENCLOSING_MARK,
END_PUNCTUATION,
FINAL_QUOTE_PUNCTUATION,
FORMAT,
INITIAL_QUOTE_PUNCTUATION,
LETTER_NUMBER,
LINE_SEPARATOR,
LOWERCASE_LETTER,
MATH_SYMBOL,
MODIFIER_LETTER,
MODIFIER_SYMBOL,
NON_SPACING_MARK,
OTHER_LETTER,
OTHER_NUMBER,
OTHER_PUNCTUATION,
OTHER_SYMBOL,
PARAGRAPH_SEPARATOR,
PRIVATE_USE,
SPACE_SEPARATOR,
START_PUNCTUATION,
SURROGATE,
TITLECASE_LETTER,
UNASSIGNED,
UPPERCASE_LETTER
public static char forDigit(int digit,
int radix)
radix is not a
valid radix, or the value of digit is not a valid
digit in the specified radix, the null character
('\u0000') is returned.
The radix argument is valid if it is greater than or
equal to MIN_RADIX and less than or equal to
MAX_RADIX. The digit argument is valid if
0 <=digit < radix.
If the digit is less than 10, then
'0' + digit is returned. Otherwise, the value
'a' + digit - 10 is returned.
digit - the number to convert to a character.radix - the radix.
char representation of the specified digit
in the specified radix.MIN_RADIX,
MAX_RADIX,
digit(char, int)public static byte getDirectionality(char ch)
char values is DIRECTIONALITY_UNDEFINED.
ch - char for which the directionality property
is requested.
char value.DIRECTIONALITY_UNDEFINED,
DIRECTIONALITY_LEFT_TO_RIGHT,
DIRECTIONALITY_RIGHT_TO_LEFT,
DIRECTIONALITY_RIGHT_TO_LEFT_ARABIC,
DIRECTIONALITY_EUROPEAN_NUMBER,
DIRECTIONALITY_EUROPEAN_NUMBER_SEPARATOR,
DIRECTIONALITY_EUROPEAN_NUMBER_TERMINATOR,
DIRECTIONALITY_ARABIC_NUMBER,
DIRECTIONALITY_COMMON_NUMBER_SEPARATOR,
DIRECTIONALITY_NONSPACING_MARK,
DIRECTIONALITY_BOUNDARY_NEUTRAL,
DIRECTIONALITY_PARAGRAPH_SEPARATOR,
DIRECTIONALITY_SEGMENT_SEPARATOR,
DIRECTIONALITY_WHITESPACE,
DIRECTIONALITY_OTHER_NEUTRALS,
DIRECTIONALITY_LEFT_TO_RIGHT_EMBEDDING,
DIRECTIONALITY_LEFT_TO_RIGHT_OVERRIDE,
DIRECTIONALITY_RIGHT_TO_LEFT_EMBEDDING,
DIRECTIONALITY_RIGHT_TO_LEFT_OVERRIDE,
DIRECTIONALITY_POP_DIRECTIONAL_FORMATpublic static boolean isMirrored(char ch)
'\u0028' LEFT
PARENTHESIS is semantically defined to be an opening
parenthesis. This will appear as a "(" in text that is
left-to-right but as a ")" in text that is right-to-left.
ch - char for which the mirrored property is requested
true if the char is mirrored, false
if the char is not mirrored or is not defined.public int compareTo(Character anotherCharacter)
Character objects numerically.
anotherCharacter - the Character to be compared.
0 if the argument Character
is equal to this Character; a value less than
0 if this Character is numerically less
than the Character argument; and a value greater than
0 if this Character is numerically greater
than the Character argument (unsigned comparison).
Note that this is strictly a numerical comparison; it is not
locale-dependent.public int compareTo(Object o)
Character object to another object.
If the object is a Character, this function
behaves like compareTo(Character). Otherwise, it
throws a ClassCastException (as
Character objects are comparable only to other
Character objects).
compareTo in interface Comparableo - the Object to be compared.
0 if the argument is a Character
numerically equal to this Character; a value less than
0 if the argument is a Character numerically
greater than this Character; and a value greater than
0 if the argument is a Character numerically
less than this Character.
ClassCastException - if the argument is not a
Character.Comparable
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Copyright 2003 Sun Microsystems, Inc. All rights reserved. Use is subject to license terms. Also see the documentation redistribution policy.