Character (Java Platform SE 6)

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Java™ Platform
Standard Ed. 6

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java.lang
Class Character

java.lang.Object
  java.lang.Character

All Implemented Interfaces:: Serializable, Comparable<Character>

public final class Character
extends Object
implements Serializable, Comparable<Character>
extends Object
implements Serializable, Comparable<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 4.0.

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:

http://www.unicode.org

Unicode Character Representations

The char data type (and therefore the value that a Character object encapsulates) are based on the original Unicode specification, which defined characters as fixed-width 16-bit entities. The Unicode standard has since been changed to allow for characters whose representation requires more than 16 bits. The range of legal code points is now U+0000 to U+10FFFF, known as Unicode scalar value. (Refer to the definition of the U+n notation in the Unicode standard.)

The set of characters from U+0000 to U+FFFF is sometimes referred to as the Basic Multilingual Plane (BMP). Characters whose code points are greater than U+FFFF are called supplementary characters. The Java 2 platform uses the UTF-16 representation in char arrays and in the String and StringBuffer classes. In this representation, supplementary characters are represented as a pair of char values, the first from the high-surrogates range, (\uD800-\uDBFF), the second from the low-surrogates range (\uDC00-\uDFFF).

A char value, therefore, represents Basic Multilingual Plane (BMP) code points, including the surrogate code points, or code units of the UTF-16 encoding. An int value represents all Unicode code points, including supplementary code points. The lower (least significant) 21 bits of int are used to represent Unicode code points and the upper (most significant) 11 bits must be zero. Unless otherwise specified, the behavior with respect to supplementary characters and surrogate char values is as follows:

The methods that only accept a char value cannot support supplementary characters. They treat char values from the surrogate ranges as undefined characters. For example, Character.isLetter('\uD840') returns false, even though this specific value if followed by any low-surrogate value in a string would represent a letter.
The methods that accept an int value support all Unicode characters, including supplementary characters. For example, Character.isLetter(0x2F81A) returns true because the code point value represents a letter (a CJK ideograph).

In the Java SE API documentation, Unicode code point is used for character values in the range between U+0000 and U+10FFFF, and Unicode code unit is used for 16-bit char values that are code units of the UTF-16 encoding. For more information on Unicode terminology, refer to the Unicode Glossary.

Since:: 1.0
See Also:: Serialized Form

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_CODE_POINT` The maximum value of a Unicode code point.
`static char`	`MAX_HIGH_SURROGATE` The maximum value of a Unicode high-surrogate code unit in the UTF-16 encoding.
`static char`	`MAX_LOW_SURROGATE` The maximum value of a Unicode low-surrogate code unit in the UTF-16 encoding.
`static int`	`MAX_RADIX` The maximum radix available for conversion to and from strings.
`static char`	`MAX_SURROGATE` The maximum value of a Unicode surrogate code unit in the UTF-16 encoding.
`static char`	`MAX_VALUE` The constant value of this field is the largest value of type `char`, `'\uFFFF'`.
`static int`	`MIN_CODE_POINT` The minimum value of a Unicode code point.
`static char`	`MIN_HIGH_SURROGATE` The minimum value of a Unicode high-surrogate code unit in the UTF-16 encoding.
`static char`	`MIN_LOW_SURROGATE` The minimum value of a Unicode low-surrogate code unit in the UTF-16 encoding.
`static int`	`MIN_RADIX` The minimum radix available for conversion to and from strings.
`static int`	`MIN_SUPPLEMENTARY_CODE_POINT` The minimum value of a supplementary code point.
`static char`	`MIN_SURROGATE` The minimum value of a Unicode surrogate code unit in the UTF-16 encoding.
`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 int`	`SIZE` The number of bits used to represent a `char` value in unsigned binary form.
`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<Character>`	`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
`static int`	`charCount(int codePoint)` Determines the number of `char` values needed to represent the specified character (Unicode code point).
`char`	`charValue()` Returns the value of this `Character` object.
`static int`	`codePointAt(char[] a, int index)` Returns the code point at the given index of the `char` array.
`static int`	`codePointAt(char[] a, int index, int limit)` Returns the code point at the given index of the `char` array, where only array elements with `index` less than `limit` can be used.
`static int`	`codePointAt(CharSequence seq, int index)` Returns the code point at the given index of the `CharSequence`.
`static int`	`codePointBefore(char[] a, int index)` Returns the code point preceding the given index of the `char` array.
`static int`	`codePointBefore(char[] a, int index, int start)` Returns the code point preceding the given index of the `char` array, where only array elements with `index` greater than or equal to `start` can be used.
`static int`	`codePointBefore(CharSequence seq, int index)` Returns the code point preceding the given index of the `CharSequence`.
`static int`	`codePointCount(char[] a, int offset, int count)` Returns the number of Unicode code points in a subarray of the `char` array argument.
`static int`	`codePointCount(CharSequence seq, int beginIndex, int endIndex)` Returns the number of Unicode code points in the text range of the specified char sequence.
`int`	`compareTo(Character anotherCharacter)` Compares two `Character` objects numerically.
`static int`	`digit(char ch, int radix)` Returns the numeric value of the character `ch` in the specified radix.
`static int`	`digit(int codePoint, int radix)` Returns the numeric value of the specified character (Unicode code point) 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 byte`	`getDirectionality(int codePoint)` Returns the Unicode directionality property for the given character (Unicode code point).
`static int`	`getNumericValue(char ch)` Returns the `int` value that the specified Unicode character represents.
`static int`	`getNumericValue(int codePoint)` Returns the `int` value that the specified character (Unicode code point) represents.
`static int`	`getType(char ch)` Returns a value indicating a character's general category.
`static int`	`getType(int codePoint)` 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`	`isDefined(int codePoint)` Determines if a character (Unicode code point) is defined in Unicode.
`static boolean`	`isDigit(char ch)` Determines if the specified character is a digit.
`static boolean`	`isDigit(int codePoint)` Determines if the specified character (Unicode code point) is a digit.
`static boolean`	`isHighSurrogate(char ch)` Determines if the given `char` value is a high-surrogate code unit (also known as leading-surrogate code unit).
`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`	`isIdentifierIgnorable(int codePoint)` Determines if the specified character (Unicode code point) 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`	`isISOControl(int codePoint)` Determines if the referenced character (Unicode code point) 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`	`isJavaIdentifierPart(int codePoint)` Determines if the character (Unicode code point) 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`	`isJavaIdentifierStart(int codePoint)` Determines if the character (Unicode code point) 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`	`isLetter(int codePoint)` Determines if the specified character (Unicode code point) is a letter.
`static boolean`	`isLetterOrDigit(char ch)` Determines if the specified character is a letter or digit.
`static boolean`	`isLetterOrDigit(int codePoint)` Determines if the specified character (Unicode code point) is a letter or digit.
`static boolean`	`isLowerCase(char ch)` Determines if the specified character is a lowercase character.
`static boolean`	`isLowerCase(int codePoint)` Determines if the specified character (Unicode code point) is a lowercase character.
`static boolean`	`isLowSurrogate(char ch)` Determines if the given `char` value is a low-surrogate code unit (also known as trailing-surrogate code unit).
`static boolean`	`isMirrored(char ch)` Determines whether the character is mirrored according to the Unicode specification.
`static boolean`	`isMirrored(int codePoint)` Determines whether the specified character (Unicode code point) 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`	`isSpaceChar(int codePoint)` Determines if the specified character (Unicode code point) is a Unicode space character.
`static boolean`	`isSupplementaryCodePoint(int codePoint)` Determines whether the specified character (Unicode code point) is in the supplementary character range.
`static boolean`	`isSurrogatePair(char high, char low)` Determines whether the specified pair of `char` values is a valid surrogate pair.
`static boolean`	`isTitleCase(char ch)` Determines if the specified character is a titlecase character.
`static boolean`	`isTitleCase(int codePoint)` Determines if the specified character (Unicode code point) 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`	`isUnicodeIdentifierPart(int codePoint)` Determines if the specified character (Unicode code point) 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`	`isUnicodeIdentifierStart(int codePoint)` Determines if the specified character (Unicode code point) 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`	`isUpperCase(int codePoint)` Determines if the specified character (Unicode code point) is an uppercase character.
`static boolean`	`isValidCodePoint(int codePoint)` Determines whether the specified code point is a valid Unicode code point value in the range of `0x0000` to `0x10FFFF` inclusive.
`static boolean`	`isWhitespace(char ch)` Determines if the specified character is white space according to Java.
`static boolean`	`isWhitespace(int codePoint)` Determines if the specified character (Unicode code point) is white space according to Java.
`static int`	`offsetByCodePoints(char[] a, int start, int count, int index, int codePointOffset)` Returns the index within the given `char` subarray that is offset from the given `index` by `codePointOffset` code points.
`static int`	`offsetByCodePoints(CharSequence seq, int index, int codePointOffset)` Returns the index within the given char sequence that is offset from the given `index` by `codePointOffset` code points.
`static char`	`reverseBytes(char ch)` Returns the value obtained by reversing the order of the bytes in the specified `char` value.
`static char[]`	`toChars(int codePoint)` Converts the specified character (Unicode code point) to its UTF-16 representation stored in a `char` array.
`static int`	`toChars(int codePoint, char[] dst, int dstIndex)` Converts the specified character (Unicode code point) to its UTF-16 representation.
`static int`	`toCodePoint(char high, char low)` Converts the specified surrogate pair to its supplementary code point value.
`static char`	`toLowerCase(char ch)` Converts the character argument to lowercase using case mapping information from the UnicodeData file.
`static int`	`toLowerCase(int codePoint)` Converts the character (Unicode code point) 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 int`	`toTitleCase(int codePoint)` Converts the character (Unicode code point) 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.
`static int`	`toUpperCase(int codePoint)` Converts the character (Unicode code point) argument to uppercase using case mapping information from the UnicodeData file.
`static Character`	`valueOf(char c)` Returns a `Character` instance representing the specified `char` value.

Methods inherited from class java.lang.Object
`clone, finalize, getClass, notify, notifyAll, wait, wait, wait`

Field Detail

MIN_RADIX

public static final int MIN_RADIX

The minimum radix available for conversion to and from strings. The constant value of this field is the smallest value permitted for the radix argument in radix-conversion methods such as the digit method, the forDigit method, and the toString method of class Integer.

See Also:: digit(char, int), forDigit(int, int), Integer.toString(int, int), Integer.valueOf(java.lang.String), Constant Field Values

MAX_RADIX

public static final int MAX_RADIX

The maximum radix available for conversion to and from strings. The constant value of this field is the largest value permitted for the radix argument in radix-conversion methods such as the digit method, the forDigit method, and the toString method of class Integer.

See Also:: digit(char, int), forDigit(int, int), Integer.toString(int, int), Integer.valueOf(java.lang.String), Constant Field Values

MIN_VALUE

public static final char MIN_VALUE

The constant value of this field is the smallest value of type char, '\u0000'.

Since:: 1.0.2
See Also:: Constant Field Values

MAX_VALUE

public static final char MAX_VALUE

The constant value of this field is the largest value of type char, '\uFFFF'.

Since:: 1.0.2
See Also:: Constant Field Values

TYPE

public static final Class<Character> TYPE

The Class instance representing the primitive type char.

Since:: 1.1

UNASSIGNED

public static final byte UNASSIGNED

General category "Cn" in the Unicode specification.

Since:: 1.1
See Also:: Constant Field Values

UPPERCASE_LETTER

public static final byte UPPERCASE_LETTER

General category "Lu" in the Unicode specification.

Since:: 1.1
See Also:: Constant Field Values

LOWERCASE_LETTER

public static final byte LOWERCASE_LETTER

General category "Ll" in the Unicode specification.

Since:: 1.1
See Also:: Constant Field Values

TITLECASE_LETTER

public static final byte TITLECASE_LETTER

General category "Lt" in the Unicode specification.

Since:: 1.1
See Also:: Constant Field Values

MODIFIER_LETTER

public static final byte MODIFIER_LETTER

General category "Lm" in the Unicode specification.

Since:: 1.1
See Also:: Constant Field Values

OTHER_LETTER

public static final byte OTHER_LETTER

General category "Lo" in the Unicode specification.

Since:: 1.1
See Also:: Constant Field Values

NON_SPACING_MARK

public static final byte NON_SPACING_MARK

General category "Mn" in the Unicode specification.

Since:: 1.1
See Also:: Constant Field Values

ENCLOSING_MARK

public static final byte ENCLOSING_MARK

General category "Me" in the Unicode specification.

Since:: 1.1
See Also:: Constant Field Values

COMBINING_SPACING_MARK

public static final byte COMBINING_SPACING_MARK

General category "Mc" in the Unicode specification.

Since:: 1.1
See Also:: Constant Field Values

DECIMAL_DIGIT_NUMBER

public static final byte DECIMAL_DIGIT_NUMBER

General category "Nd" in the Unicode specification.

Since:: 1.1
See Also:: Constant Field Values

LETTER_NUMBER

public static final byte LETTER_NUMBER

General category "Nl" in the Unicode specification.

Since:: 1.1
See Also:: Constant Field Values

OTHER_NUMBER

public static final byte OTHER_NUMBER

General category "No" in the Unicode specification.

Since:: 1.1
See Also:: Constant Field Values

SPACE_SEPARATOR

public static final byte SPACE_SEPARATOR

General category "Zs" in the Unicode specification.

Since:: 1.1
See Also:: Constant Field Values

LINE_SEPARATOR

public static final byte LINE_SEPARATOR

General category "Zl" in the Unicode specification.

Since:: 1.1
See Also:: Constant Field Values

PARAGRAPH_SEPARATOR

public static final byte PARAGRAPH_SEPARATOR

General category "Zp" in the Unicode specification.

Since:: 1.1
See Also:: Constant Field Values

CONTROL

public static final byte CONTROL

General category "Cc" in the Unicode specification.

Since:: 1.1
See Also:: Constant Field Values

FORMAT

public static final byte FORMAT

General category "Cf" in the Unicode specification.

Since:: 1.1
See Also:: Constant Field Values

PRIVATE_USE

public static final byte PRIVATE_USE

General category "Co" in the Unicode specification.

Since:: 1.1
See Also:: Constant Field Values

SURROGATE

public static final byte SURROGATE

General category "Cs" in the Unicode specification.

Since:: 1.1
See Also:: Constant Field Values

DASH_PUNCTUATION

public static final byte DASH_PUNCTUATION

General category "Pd" in the Unicode specification.

Since:: 1.1
See Also:: Constant Field Values

START_PUNCTUATION

public static final byte START_PUNCTUATION

General category "Ps" in the Unicode specification.

Since:: 1.1
See Also:: Constant Field Values

END_PUNCTUATION

public static final byte END_PUNCTUATION

General category "Pe" in the Unicode specification.

Since:: 1.1
See Also:: Constant Field Values

CONNECTOR_PUNCTUATION

public static final byte CONNECTOR_PUNCTUATION

General category "Pc" in the Unicode specification.

Since:: 1.1
See Also:: Constant Field Values

OTHER_PUNCTUATION

public static final byte OTHER_PUNCTUATION

General category "Po" in the Unicode specification.

Since:: 1.1
See Also:: Constant Field Values

MATH_SYMBOL

public static final byte MATH_SYMBOL

General category "Sm" in the Unicode specification.

Since:: 1.1
See Also:: Constant Field Values

CURRENCY_SYMBOL

public static final byte CURRENCY_SYMBOL

General category "Sc" in the Unicode specification.

Since:: 1.1
See Also:: Constant Field Values

MODIFIER_SYMBOL

public static final byte MODIFIER_SYMBOL

General category "Sk" in the Unicode specification.

Since:: 1.1
See Also:: Constant Field Values

OTHER_SYMBOL

public static final byte OTHER_SYMBOL

General category "So" in the Unicode specification.

Since:: 1.1
See Also:: Constant Field Values

INITIAL_QUOTE_PUNCTUATION

public static final byte INITIAL_QUOTE_PUNCTUATION

General category "Pi" in the Unicode specification.

Since:: 1.4
See Also:: Constant Field Values

FINAL_QUOTE_PUNCTUATION

public static final byte FINAL_QUOTE_PUNCTUATION

General category "Pf" in the Unicode specification.

Since:: 1.4
See Also:: Constant Field Values

DIRECTIONALITY_UNDEFINED

public static final byte DIRECTIONALITY_UNDEFINED

Undefined bidirectional character type. Undefined char values have undefined directionality in the Unicode specification.

Since:: 1.4
See Also:: Constant Field Values

DIRECTIONALITY_LEFT_TO_RIGHT

public static final byte DIRECTIONALITY_LEFT_TO_RIGHT

Strong bidirectional character type "L" in the Unicode specification.

Since:: 1.4
See Also:: Constant Field Values

DIRECTIONALITY_RIGHT_TO_LEFT

public static final byte DIRECTIONALITY_RIGHT_TO_LEFT

Strong bidirectional character type "R" in the Unicode specification.

Since:: 1.4
See Also:: Constant Field Values

DIRECTIONALITY_RIGHT_TO_LEFT_ARABIC

public static final byte DIRECTIONALITY_RIGHT_TO_LEFT_ARABIC

Strong bidirectional character type "AL" in the Unicode specification.

Since:: 1.4
See Also:: Constant Field Values

DIRECTIONALITY_EUROPEAN_NUMBER

public static final byte DIRECTIONALITY_EUROPEAN_NUMBER

Weak bidirectional character type "EN" in the Unicode specification.

Since:: 1.4
See Also:: Constant Field Values

DIRECTIONALITY_EUROPEAN_NUMBER_SEPARATOR

public static final byte DIRECTIONALITY_EUROPEAN_NUMBER_SEPARATOR

Weak bidirectional character type "ES" in the Unicode specification.

Since:: 1.4
See Also:: Constant Field Values

DIRECTIONALITY_EUROPEAN_NUMBER_TERMINATOR

public static final byte DIRECTIONALITY_EUROPEAN_NUMBER_TERMINATOR

Weak bidirectional character type "ET" in the Unicode specification.

Since:: 1.4
See Also:: Constant Field Values

DIRECTIONALITY_ARABIC_NUMBER

public static final byte DIRECTIONALITY_ARABIC_NUMBER

Weak bidirectional character type "AN" in the Unicode specification.

Since:: 1.4
See Also:: Constant Field Values

DIRECTIONALITY_COMMON_NUMBER_SEPARATOR

public static final byte DIRECTIONALITY_COMMON_NUMBER_SEPARATOR

Weak bidirectional character type "CS" in the Unicode specification.

Since:: 1.4
See Also:: Constant Field Values

DIRECTIONALITY_NONSPACING_MARK

public static final byte DIRECTIONALITY_NONSPACING_MARK

Weak bidirectional character type "NSM" in the Unicode specification.

Since:: 1.4
See Also:: Constant Field Values

DIRECTIONALITY_BOUNDARY_NEUTRAL

public static final byte DIRECTIONALITY_BOUNDARY_NEUTRAL

Weak bidirectional character type "BN" in the Unicode specification.

Since:: 1.4
See Also:: Constant Field Values

DIRECTIONALITY_PARAGRAPH_SEPARATOR

public static final byte DIRECTIONALITY_PARAGRAPH_SEPARATOR

Neutral bidirectional character type "B" in the Unicode specification.

Since:: 1.4
See Also:: Constant Field Values

DIRECTIONALITY_SEGMENT_SEPARATOR

public static final byte DIRECTIONALITY_SEGMENT_SEPARATOR

Neutral bidirectional character type "S" in the Unicode specification.

Since:: 1.4
See Also:: Constant Field Values

DIRECTIONALITY_WHITESPACE

public static final byte DIRECTIONALITY_WHITESPACE

Neutral bidirectional character type "WS" in the Unicode specification.

Since:: 1.4
See Also:: Constant Field Values

DIRECTIONALITY_OTHER_NEUTRALS

public static final byte DIRECTIONALITY_OTHER_NEUTRALS

Neutral bidirectional character type "ON" in the Unicode specification.

Since:: 1.4
See Also:: Constant Field Values

DIRECTIONALITY_LEFT_TO_RIGHT_EMBEDDING

public static final byte DIRECTIONALITY_LEFT_TO_RIGHT_EMBEDDING

Strong bidirectional character type "LRE" in the Unicode specification.

Since:: 1.4
See Also:: Constant Field Values

DIRECTIONALITY_LEFT_TO_RIGHT_OVERRIDE

public static final byte DIRECTIONALITY_LEFT_TO_RIGHT_OVERRIDE

Strong bidirectional character type "LRO" in the Unicode specification.

Since:: 1.4
See Also:: Constant Field Values

DIRECTIONALITY_RIGHT_TO_LEFT_EMBEDDING

public static final byte DIRECTIONALITY_RIGHT_TO_LEFT_EMBEDDING

Strong bidirectional character type "RLE" in the Unicode specification.

Since:: 1.4
See Also:: Constant Field Values

DIRECTIONALITY_RIGHT_TO_LEFT_OVERRIDE

public static final byte DIRECTIONALITY_RIGHT_TO_LEFT_OVERRIDE

Strong bidirectional character type "RLO" in the Unicode specification.

Since:: 1.4
See Also:: Constant Field Values

DIRECTIONALITY_POP_DIRECTIONAL_FORMAT

public static final byte DIRECTIONALITY_POP_DIRECTIONAL_FORMAT

Weak bidirectional character type "PDF" in the Unicode specification.

Since:: 1.4
See Also:: Constant Field Values

MIN_HIGH_SURROGATE

public static final char MIN_HIGH_SURROGATE

The minimum value of a Unicode high-surrogate code unit in the UTF-16 encoding. A high-surrogate is also known as a leading-surrogate.

Since:: 1.5
See Also:: Constant Field Values

MAX_HIGH_SURROGATE

public static final char MAX_HIGH_SURROGATE

The maximum value of a Unicode high-surrogate code unit in the UTF-16 encoding. A high-surrogate is also known as a leading-surrogate.

Since:: 1.5
See Also:: Constant Field Values

MIN_LOW_SURROGATE

public static final char MIN_LOW_SURROGATE

The minimum value of a Unicode low-surrogate code unit in the UTF-16 encoding. A low-surrogate is also known as a trailing-surrogate.

Since:: 1.5
See Also:: Constant Field Values

MAX_LOW_SURROGATE

public static final char MAX_LOW_SURROGATE

The maximum value of a Unicode low-surrogate code unit in the UTF-16 encoding. A low-surrogate is also known as a trailing-surrogate.

Since:: 1.5
See Also:: Constant Field Values

MIN_SURROGATE

public static final char MIN_SURROGATE

The minimum value of a Unicode surrogate code unit in the UTF-16 encoding.

Since:: 1.5
See Also:: Constant Field Values

MAX_SURROGATE

public static final char MAX_SURROGATE

The maximum value of a Unicode surrogate code unit in the UTF-16 encoding.

Since:: 1.5
See Also:: Constant Field Values

MIN_SUPPLEMENTARY_CODE_POINT

public static final int MIN_SUPPLEMENTARY_CODE_POINT

The minimum value of a supplementary code point.

Since:: 1.5
See Also:: Constant Field Values

MIN_CODE_POINT

public static final int MIN_CODE_POINT

The minimum value of a Unicode code point.

Since:: 1.5
See Also:: Constant Field Values

MAX_CODE_POINT

public static final int MAX_CODE_POINT

The maximum value of a Unicode code point.

Since:: 1.5
See Also:: Constant Field Values

SIZE

public static final int SIZE

The number of bits used to represent a char value in unsigned binary form.

Since:: 1.5
See Also:: Constant Field Values

Constructor Detail

Character

public Character(char value)

Constructs a newly allocated Character object that represents the specified char value.

Parameters:: value - the value to be represented by the Character object.

Method Detail

valueOf

public static Character valueOf(char c)

Returns a Character instance representing the specified char value. If a new Character instance is not required, this method should generally be used in preference to the constructor Character(char), as this method is likely to yield significantly better space and time performance by caching frequently requested values.

Parameters:: c - a char value.
Returns:: a Character instance representing c.
Since:: 1.5

charValue

public char charValue()

Returns the value of this Character object.

Returns:: the primitive char value represented by this object.

hashCode

public int hashCode()

Returns a hash code for this Character.

Overrides:: hashCode in class Object

Returns:: a hash code value for this object.
See Also:: Object.equals(java.lang.Object), Hashtable

equals

public boolean equals(Object obj)

Compares this object against the specified object. The result is true if and only if the argument is not null and is a Character object that represents the same char value as this object.

Overrides:: equals in class Object

Parameters:: obj - the object to compare with.
Returns:: true if the objects are the same; false otherwise.
See Also:: Object.hashCode(), Hashtable

toString

public String toString()

Returns a 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.

Overrides:: toString in class Object

Returns:: a string representation of this object.

toString

public static String toString(char c)

Returns a String object representing the specified char. The result is a string of length 1 consisting solely of the specified char.

Parameters:: c - the char to be converted
Returns:: the string representation of the specified char
Since:: 1.4

isValidCodePoint

public static boolean isValidCodePoint(int codePoint)

Determines whether the specified code point is a valid Unicode code point value in the range of 0x0000 to 0x10FFFF inclusive. This method is equivalent to the expression:

 codePoint >= 0x0000 && codePoint <= 0x10FFFF

Parameters:: codePoint - the Unicode code point to be tested
Returns:: true if the specified code point value is a valid code point value; false otherwise.
Since:: 1.5

isSupplementaryCodePoint

public static boolean isSupplementaryCodePoint(int codePoint)

Determines whether the specified character (Unicode code point) is in the supplementary character range. The method call is equivalent to the expression:

 codePoint >= 0x10000 && codePoint <= 0x10FFFF

Parameters:: codePoint - the character (Unicode code point) to be tested
Returns:: true if the specified character is in the Unicode supplementary character range; false otherwise.
Since:: 1.5

isHighSurrogate

public static boolean isHighSurrogate(char ch)

Determines if the given char value is a high-surrogate code unit (also known as leading-surrogate code unit). Such values do not represent characters by themselves, but are used in the representation of supplementary characters in the UTF-16 encoding.

This method returns true if and only if

ch >= '\uD800' && ch <= '\uDBFF'

is true.

Parameters:: ch - the char value to be tested.
Returns:: true if the char value is between '\uD800' and '\uDBFF' inclusive; false otherwise.
Since:: 1.5
See Also:: isLowSurrogate(char), Character.UnicodeBlock.of(int)

isLowSurrogate

public static boolean isLowSurrogate(char ch)

Determines if the given char value is a low-surrogate code unit (also known as trailing-surrogate code unit). Such values do not represent characters by themselves, but are used in the representation of supplementary characters in the UTF-16 encoding.

This method returns true if and only if

ch >= '\uDC00' && ch <= '\uDFFF'

is true.

Parameters:: ch - the char value to be tested.
Returns:: true if the char value is between '\uDC00' and '\uDFFF' inclusive; false otherwise.
Since:: 1.5
See Also:: isHighSurrogate(char)

isSurrogatePair

public static boolean isSurrogatePair(char high,
                                      char low)

Determines whether the specified pair of char values is a valid surrogate pair. This method is equivalent to the expression:

 isHighSurrogate(high) && isLowSurrogate(low)

Parameters:: high - the high-surrogate code value to be tested; low - the low-surrogate code value to be tested
Returns:: true if the specified high and low-surrogate code values represent a valid surrogate pair; false otherwise.
Since:: 1.5

charCount

public static int charCount(int codePoint)

Determines the number of char values needed to represent the specified character (Unicode code point). If the specified character is equal to or greater than 0x10000, then the method returns 2. Otherwise, the method returns 1.

This method doesn't validate the specified character to be a valid Unicode code point. The caller must validate the character value using isValidCodePoint if necessary.

Parameters:: codePoint - the character (Unicode code point) to be tested.
Returns:: 2 if the character is a valid supplementary character; 1 otherwise.
Since:: 1.5
See Also:: isSupplementaryCodePoint(int)

toCodePoint

public static int toCodePoint(char high,
                              char low)

Converts the specified surrogate pair to its supplementary code point value. This method does not validate the specified surrogate pair. The caller must validate it using isSurrogatePair if necessary.

Parameters:: high - the high-surrogate code unit; low - the low-surrogate code unit
Returns:: the supplementary code point composed from the specified surrogate pair.
Since:: 1.5

codePointAt

public static int codePointAt(CharSequence seq,
                              int index)

Returns the code point at the given index of the CharSequence. If the char value at the given index in the CharSequence is in the high-surrogate range, the following index is less than the length of the CharSequence, and the char value at the following index is in the low-surrogate range, then the supplementary code point corresponding to this surrogate pair is returned. Otherwise, the char value at the given index is returned.

Parameters:: seq - a sequence of char values (Unicode code units); index - the index to the char values (Unicode code units) in seq to be converted
Returns:: the Unicode code point at the given index
Throws:: NullPointerException - if seq is null.; IndexOutOfBoundsException - if the value index is negative or not less than seq.length().
Since:: 1.5

codePointAt

public static int codePointAt(char[] a,
                              int index)

Returns the code point at the given index of the char array. If the char value at the given index in the char array is in the high-surrogate range, the following index is less than the length of the char array, and the char value at the following index is in the low-surrogate range, then the supplementary code point corresponding to this surrogate pair is returned. Otherwise, the char value at the given index is returned.

Parameters:: a - the char array; index - the index to the char values (Unicode code units) in the char array to be converted
Returns:: the Unicode code point at the given index
Throws:: NullPointerException - if a is null.; IndexOutOfBoundsException - if the value index is negative or not less than the length of the char array.
Since:: 1.5

codePointAt

public static int codePointAt(char[] a,
                              int index,
                              int limit)

Returns the code point at the given index of the char array, where only array elements with index less than limit can be used. If the char value at the given index in the char array is in the high-surrogate range, the following index is less than the limit, and the char value at the following index is in the low-surrogate range, then the supplementary code point corresponding to this surrogate pair is returned. Otherwise, the char value at the given index is returned.

Parameters:: a - the char array; index - the index to the char values (Unicode code units) in the char array to be converted; limit - the index after the last array element that can be used in the char array
Returns:: the Unicode code point at the given index
Throws:: NullPointerException - if a is null.; IndexOutOfBoundsException - if the index argument is negative or not less than the limit argument, or if the limit argument is negative or greater than the length of the char array.
Since:: 1.5

codePointBefore

public static int codePointBefore(CharSequence seq,
                                  int index)

Returns the code point preceding the given index of the CharSequence. If the char value at (index - 1) in the CharSequence is in the low-surrogate range, (index - 2) is not negative, and the char value at

(index -
 2)

in the CharSequence is in the high-surrogate range, then the supplementary code point corresponding to this surrogate pair is returned. Otherwise, the char value at (index - 1) is returned.

Parameters:: seq - the CharSequence instance; index - the index following the code point that should be returned
Returns:: the Unicode code point value before the given index.
Throws:: NullPointerException - if seq is null.; IndexOutOfBoundsException - if the index argument is less than 1 or greater than seq.length().
Since:: 1.5

codePointBefore

public static int codePointBefore(char[] a,
                                  int index)

Returns the code point preceding the given index of the char array. If the char value at (index - 1) in the char array is in the low-surrogate range, (index - 2) is not negative, and the char value at

(index -
 2)

in the char array is in the high-surrogate range, then the supplementary code point corresponding to this surrogate pair is returned. Otherwise, the char value at (index - 1) is returned.

Parameters:: a - the char array; index - the index following the code point that should be returned
Returns:: the Unicode code point value before the given index.
Throws:: NullPointerException - if a is null.; IndexOutOfBoundsException - if the index argument is less than 1 or greater than the length of the char array
Since:: 1.5

codePointBefore

public static int codePointBefore(char[] a,
                                  int index,
                                  int start)

Returns the code point preceding the given index of the char array, where only array elements with index greater than or equal to start can be used. If the char value at

(index -
 1)

in the char array is in the low-surrogate range, (index - 2) is not less than start, and the char value at (index - 2) in the char array is in the high-surrogate range, then the supplementary code point corresponding to this surrogate pair is returned. Otherwise, the char value at (index - 1) is returned.

Parameters:: a - the char array; index - the index following the code point that should be returned; start - the index of the first array element in the char array
Returns:: the Unicode code point value before the given index.
Throws:: NullPointerException - if a is null.; IndexOutOfBoundsException - if the index argument is not greater than the start argument or is greater than the length of the char array, or if the start argument is negative or not less than the length of the char array.
Since:: 1.5

toChars

public static int toChars(int codePoint,
                          char[] dst,
                          int dstIndex)

Converts the specified character (Unicode code point) to its UTF-16 representation. If the specified code point is a BMP (Basic Multilingual Plane or Plane 0) value, the same value is stored in dst[dstIndex], and 1 is returned. If the specified code point is a supplementary character, its surrogate values are stored in dst[dstIndex] (high-surrogate) and dst[dstIndex+1] (low-surrogate), and 2 is returned.

Parameters:: codePoint - the character (Unicode code point) to be converted.; dst - an array of char in which the codePoint's UTF-16 value is stored.; dstIndex - the start index into the dst array where the converted value is stored.
Returns:: 1 if the code point is a BMP code point, 2 if the code point is a supplementary code point.
Throws:: IllegalArgumentException - if the specified codePoint is not a valid Unicode code point.; NullPointerException - if the specified dst is null.; IndexOutOfBoundsException - if dstIndex is neg

java.lang Class Character

Unicode Character Representations

MIN_RADIX

MAX_RADIX

MIN_VALUE

MAX_VALUE

TYPE

UNASSIGNED

UPPERCASE_LETTER

LOWERCASE_LETTER

TITLECASE_LETTER

MODIFIER_LETTER

OTHER_LETTER

NON_SPACING_MARK

ENCLOSING_MARK

COMBINING_SPACING_MARK

DECIMAL_DIGIT_NUMBER

LETTER_NUMBER

OTHER_NUMBER

SPACE_SEPARATOR

LINE_SEPARATOR

PARAGRAPH_SEPARATOR

CONTROL

FORMAT

PRIVATE_USE

SURROGATE

DASH_PUNCTUATION

START_PUNCTUATION

END_PUNCTUATION

CONNECTOR_PUNCTUATION

OTHER_PUNCTUATION

MATH_SYMBOL

CURRENCY_SYMBOL

MODIFIER_SYMBOL

OTHER_SYMBOL

INITIAL_QUOTE_PUNCTUATION

FINAL_QUOTE_PUNCTUATION

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_FORMAT

MIN_HIGH_SURROGATE

MAX_HIGH_SURROGATE

MIN_LOW_SURROGATE

MAX_LOW_SURROGATE

MIN_SURROGATE

MAX_SURROGATE

MIN_SUPPLEMENTARY_CODE_POINT

MIN_CODE_POINT

MAX_CODE_POINT

SIZE

Character

valueOf

charValue

hashCode

equals

toString

toString

isValidCodePoint

isSupplementaryCodePoint

isHighSurrogate

isLowSurrogate

isSurrogatePair

charCount

java.lang
Class Character