Class Character

java.lang.Object
java.lang.Character
All Implemented Interfaces:
Comparable<Character>
public final class Character extends Object implements 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 the type of a character and converting characters from uppercase to lowercase and vice versa. Character information is based on the Unicode Standard, version 3.0. However, in order to reduce footprint, by default the character property and case conversion operations in CLDC are available only for the ISO Latin-1 range of characters. Other Unicode character blocks can be supported as necessary. Since: JDK1.0, CLDC 1.0

  • Field Details

    • MAX_RADIX

      public static final int MAX_RADIX
      The maximum radix available for conversion to and from Strings. See Also:Integer.toString(int, int), Integer.valueOf(java.lang.String), Constant Field Values
      See Also:

    • MAX_VALUE

      public static final char MAX_VALUE
      The constant value of this field is the largest value of type char. Since: JDK1.0.2 See Also:Constant Field Values
      See Also:

    • MIN_RADIX

      public static final int MIN_RADIX
      The minimum radix available for conversion to and from Strings. See Also:Integer.toString(int, int), Integer.valueOf(java.lang.String), Constant Field Values
      See Also:

    • MIN_VALUE

      public static final char MIN_VALUE
      The constant value of this field is the smallest value of type char. Since: JDK1.0.2 See Also:Constant Field Values
      See Also:

    • MIN_HIGH_SURROGATE

      public static final char MIN_HIGH_SURROGATE

      Minimum value of a high surrogate or leading surrogate unit in UTF-16 encoding - '?'.

      Since

      1.5

      See Also:

    • MAX_HIGH_SURROGATE

      public static final char MAX_HIGH_SURROGATE

      Maximum value of a high surrogate or leading surrogate unit in UTF-16 encoding - '?'.

      Since

      1.5

      See Also:

    • MIN_LOW_SURROGATE

      public static final char MIN_LOW_SURROGATE

      Minimum value of a low surrogate or trailing surrogate unit in UTF-16 encoding - '?'.

      Since

      1.5

      See Also:

    • MAX_LOW_SURROGATE

      public static final char MAX_LOW_SURROGATE

      Maximum value of a low surrogate or trailing surrogate unit in UTF-16 encoding - '?'.

      Since

      1.5

      See Also:

    • MIN_SURROGATE

      public static final char MIN_SURROGATE

      Minimum value of a surrogate unit in UTF-16 encoding - '?'.

      Since

      1.5

      See Also:

    • MAX_SURROGATE

      public static final char MAX_SURROGATE

      Maximum value of a surrogate unit in UTF-16 encoding - '?'.

      Since

      1.5

      See Also:

    • MIN_SUPPLEMENTARY_CODE_POINT

      public static final int MIN_SUPPLEMENTARY_CODE_POINT

      Minimum value of a supplementary code point - U+010000.

      Since

      1.5

      See Also:

    • MIN_CODE_POINT

      public static final int MIN_CODE_POINT

      Minimum code point value - U+0000.

      Since

      1.5

      See Also:

    • MAX_CODE_POINT

      public static final int MAX_CODE_POINT

      Maximum code point value - U+10FFFF.

      Since

      1.5

      See Also:

    • SIZE

      public static final int SIZE

      Constant for the number of bits to represent a char in two's compliment form.

      Since

      1.5

      See Also:

    • TYPE

      public static final Class<Character> TYPE

    • UNASSIGNED

      public static final byte UNASSIGNED
      See Also:

    • UPPERCASE_LETTER

      public static final byte UPPERCASE_LETTER
      See Also:

    • LOWERCASE_LETTER

      public static final byte LOWERCASE_LETTER
      See Also:

    • TITLECASE_LETTER

      public static final byte TITLECASE_LETTER
      See Also:

    • MODIFIER_LETTER

      public static final byte MODIFIER_LETTER
      See Also:

    • OTHER_LETTER

      public static final byte OTHER_LETTER
      See Also:

    • NON_SPACING_MARK

      public static final byte NON_SPACING_MARK
      See Also:

    • ENCLOSING_MARK

      public static final byte ENCLOSING_MARK
      See Also:

    • COMBINING_SPACING_MARK

      public static final byte COMBINING_SPACING_MARK
      See Also:

    • DECIMAL_DIGIT_NUMBER

      public static final byte DECIMAL_DIGIT_NUMBER
      See Also:

    • LETTER_NUMBER

      public static final byte LETTER_NUMBER
      See Also:

    • OTHER_NUMBER

      public static final byte OTHER_NUMBER
      See Also:

    • SPACE_SEPARATOR

      public static final byte SPACE_SEPARATOR
      See Also:

    • LINE_SEPARATOR

      public static final byte LINE_SEPARATOR
      See Also:

    • PARAGRAPH_SEPARATOR

      public static final byte PARAGRAPH_SEPARATOR
      See Also:

    • CONTROL

      public static final byte CONTROL
      See Also:

    • FORMAT

      public static final byte FORMAT
      See Also:

    • PRIVATE_USE

      public static final byte PRIVATE_USE
      See Also:

    • SURROGATE

      public static final byte SURROGATE
      See Also:

    • DASH_PUNCTUATION

      public static final byte DASH_PUNCTUATION
      See Also:

    • START_PUNCTUATION

      public static final byte START_PUNCTUATION
      See Also:

    • END_PUNCTUATION

      public static final byte END_PUNCTUATION
      See Also:

    • CONNECTOR_PUNCTUATION

      public static final byte CONNECTOR_PUNCTUATION
      See Also:

    • OTHER_PUNCTUATION

      public static final byte OTHER_PUNCTUATION
      See Also:

    • MATH_SYMBOL

      public static final byte MATH_SYMBOL
      See Also:

    • CURRENCY_SYMBOL

      public static final byte CURRENCY_SYMBOL
      See Also:

    • MODIFIER_SYMBOL

      public static final byte MODIFIER_SYMBOL
      See Also:

    • OTHER_SYMBOL

      public static final byte OTHER_SYMBOL
      See Also:

    • INITIAL_QUOTE_PUNCTUATION

      public static final byte INITIAL_QUOTE_PUNCTUATION
      See Also:

    • FINAL_QUOTE_PUNCTUATION

      public static final byte FINAL_QUOTE_PUNCTUATION
      See Also:

    • DIRECTIONALITY_UNDEFINED

      public static final byte DIRECTIONALITY_UNDEFINED
      See Also:

    • DIRECTIONALITY_LEFT_TO_RIGHT

      public static final byte DIRECTIONALITY_LEFT_TO_RIGHT
      See Also:

    • DIRECTIONALITY_RIGHT_TO_LEFT

      public static final byte DIRECTIONALITY_RIGHT_TO_LEFT
      See Also:

    • DIRECTIONALITY_RIGHT_TO_LEFT_ARABIC

      public static final byte DIRECTIONALITY_RIGHT_TO_LEFT_ARABIC
      See Also:

    • DIRECTIONALITY_EUROPEAN_NUMBER

      public static final byte DIRECTIONALITY_EUROPEAN_NUMBER
      See Also:

    • DIRECTIONALITY_EUROPEAN_NUMBER_SEPARATOR

      public static final byte DIRECTIONALITY_EUROPEAN_NUMBER_SEPARATOR
      See Also:

    • DIRECTIONALITY_EUROPEAN_NUMBER_TERMINATOR

      public static final byte DIRECTIONALITY_EUROPEAN_NUMBER_TERMINATOR
      See Also:

    • DIRECTIONALITY_ARABIC_NUMBER

      public static final byte DIRECTIONALITY_ARABIC_NUMBER
      See Also:

    • DIRECTIONALITY_COMMON_NUMBER_SEPARATOR

      public static final byte DIRECTIONALITY_COMMON_NUMBER_SEPARATOR
      See Also:

    • DIRECTIONALITY_NONSPACING_MARK

      public static final byte DIRECTIONALITY_NONSPACING_MARK
      See Also:

    • DIRECTIONALITY_BOUNDARY_NEUTRAL

      public static final byte DIRECTIONALITY_BOUNDARY_NEUTRAL
      See Also:

    • DIRECTIONALITY_PARAGRAPH_SEPARATOR

      public static final byte DIRECTIONALITY_PARAGRAPH_SEPARATOR
      See Also:

    • DIRECTIONALITY_SEGMENT_SEPARATOR

      public static final byte DIRECTIONALITY_SEGMENT_SEPARATOR
      See Also:

    • DIRECTIONALITY_WHITESPACE

      public static final byte DIRECTIONALITY_WHITESPACE
      See Also:

    • DIRECTIONALITY_OTHER_NEUTRALS

      public static final byte DIRECTIONALITY_OTHER_NEUTRALS
      See Also:

    • DIRECTIONALITY_LEFT_TO_RIGHT_EMBEDDING

      public static final byte DIRECTIONALITY_LEFT_TO_RIGHT_EMBEDDING
      See Also:

    • DIRECTIONALITY_LEFT_TO_RIGHT_OVERRIDE

      public static final byte DIRECTIONALITY_LEFT_TO_RIGHT_OVERRIDE
      See Also:

    • DIRECTIONALITY_RIGHT_TO_LEFT_EMBEDDING

      public static final byte DIRECTIONALITY_RIGHT_TO_LEFT_EMBEDDING
      See Also:

    • DIRECTIONALITY_RIGHT_TO_LEFT_OVERRIDE

      public static final byte DIRECTIONALITY_RIGHT_TO_LEFT_OVERRIDE
      See Also:

    • DIRECTIONALITY_POP_DIRECTIONAL_FORMAT

      public static final byte DIRECTIONALITY_POP_DIRECTIONAL_FORMAT
      See Also:

    • BYTES

      public static final int BYTES
      The size of a char in bytes.
      See Also:

  • Constructor Details

    • Character

      public Character(char value)
      Constructs a Character object and initializes it so that it represents the primitive value argument. value - value for the new Character object.

  • Method Details

    • charValue

      public char charValue()
      Returns the value of this Character object.

    • digit

      public static int digit(char ch, int radix)
      Returns the numeric value of the character ch in the specified radix.

    • 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

    • hashCode

      public int hashCode()
      Returns a hash code for this Character.
      Overrides:
      hashCode in class Object

    • isDigit

      public static boolean isDigit(char ch)
      Determines if the specified character is a digit.

    • isJavaIdentifierStart

      public static boolean isJavaIdentifierStart(char ch)
      Determines whether the character can start a Java identifier.
      Parameters:
      ch - the character to test
      Returns:
      true if the character can start a Java identifier

    • isJavaIdentifierPart

      public static boolean isJavaIdentifierPart(char ch)
      Determines whether the character can occur in a Java identifier.
      Parameters:
      ch - the character to test
      Returns:
      true if the character can occur in a Java identifier

    • isJavaIdentifierStart

      public static boolean isJavaIdentifierStart(int codePoint)
      Determines whether the Unicode code point can start a Java identifier.
      Parameters:
      codePoint - the Unicode code point to test
      Returns:
      true if the code point can start a Java identifier

    • isJavaIdentifierPart

      public static boolean isJavaIdentifierPart(int codePoint)
      Determines whether the Unicode code point can occur in a Java identifier.
      Parameters:
      codePoint - the Unicode code point to test
      Returns:
      true if the code point can occur in a Java identifier

    • isLowerCase

      public static boolean isLowerCase(char ch)
      Determines if the specified character is a lowercase character. Note that by default CLDC only supports the ISO Latin-1 range of characters. Of the ISO Latin-1 characters (character codes 0x0000 through 0x00FF), the following are lowercase: 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

    • isUpperCase

      public static boolean isUpperCase(char ch)
      Determines if the specified character is an uppercase character. Note that by default CLDC only supports the ISO Latin-1 range of characters. Of the ISO Latin-1 characters (character codes 0x0000 through 0x00FF), the following are uppercase: 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

    • toLowerCase

      public static char toLowerCase(char ch)
      The given character is mapped to its lowercase equivalent; if the character has no lowercase equivalent, the character itself is returned. Note that by default CLDC only supports the ISO Latin-1 range of characters.

    • toString

      public String toString()
      Returns a String object representing this character's value. Converts this Character object to a string. The result is a string whose length is 1. The string's sole component is the primitive char value represented by this object.
      Overrides:
      toString in class Object

    • toUpperCase

      public static char toUpperCase(char ch)
      Converts the character argument to uppercase; if the character has no uppercase equivalent, the character itself is returned. Note that by default CLDC only supports the ISO Latin-1 range of characters.

    • isValidCodePoint

      public static boolean isValidCodePoint(int codePoint)

      A test for determining if the codePoint is a valid Unicode code point.

      Parameters
      • codePoint: The code point to test.
      Returns

      A boolean value.

      Since

      1.5

    • isSupplementaryCodePoint

      public static boolean isSupplementaryCodePoint(int codePoint)

      A test for determining if the codePoint is within the supplementary code point range.

      Parameters
      • codePoint: The code point to test.
      Returns

      A boolean value.

      Since

      1.5

    • isHighSurrogate

      public static boolean isHighSurrogate(char ch)

      A test for determining if the char is a high surrogate/leading surrogate unit that's used for representing supplementary characters in UTF-16 encoding.

      Parameters
      • ch: The char unit to test.
      Returns

      A boolean value.

      Since

      1.5

      See also
      • #isLowSurrogate(char)

    • isLowSurrogate

      public static boolean isLowSurrogate(char ch)

      A test for determining if the char is a high surrogate/leading surrogate unit that's used for representing supplementary characters in UTF-16 encoding.

      Parameters
      • ch: The char unit to test.
      Returns

      A boolean value.

      Since

      1.5

      See also
      • #isHighSurrogate(char)

    • isSurrogatePair

      public static boolean isSurrogatePair(char high, char low)

      A test for determining if the char pair is a valid surrogate pair.

      Parameters

      • high: The high surrogate unit to test.

      • low: The low surrogate unit to test.

      Returns

      A boolean value.

      Since

      1.5

      See also

      • #isHighSurrogate(char)

      • #isLowSurrogate(char)

    • charCount

      public static int charCount(int codePoint)

      Calculates the number of char values required to represent the Unicode code point. This method only tests if the codePoint is greater than or equal to 0x10000, in which case 2 is returned, otherwise 1. To test if the code point is valid, use the #isValidCodePoint(int) method.

      Parameters
      • codePoint: The code point to test.
      Returns

      An int value of 2 or 1.

      Since

      1.5

      See also

      • #isValidCodePoint(int)

      • #isSupplementaryCodePoint(int)

    • toCodePoint

      public static int toCodePoint(char high, char low)

      Converts a surrogate pair into a Unicode code point. This method assume that the pair are valid surrogates. If the pair are NOT valid surrogates, then the result is indeterminate. The char) method should be used prior to this method to validate the pair.

      Parameters

      • high: The high surrogate unit.

      • low: The low surrogate unit.

      Returns

      The decoded code point.

      Since

      1.5

      See also
      • #isSurrogatePair(char, char)

    • codePointAt

      public static int codePointAt(CharSequence seq, int index)

      Returns the code point at the index in the CharSequence. If char unit at the index is a high-surrogate unit, the next index is less than the length of the sequence and the char unit at the next index is a low surrogate unit, then the code point represented by the pair is returned; otherwise the char unit at the index is returned.

      Parameters

      • seq: The sequence of char units.

      • index: @param index The index into the seq to retrieve and convert.

      Returns

      The Unicode code point.

      Throws

      • NullPointerException: if seq is null.

      • IndexOutOfBoundsException: @throws IndexOutOfBoundsException if the index is negative or greater than or equal to seq.length().

      Since

      1.5

    • codePointAt

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

      Returns the code point at the index in the char[]. If char unit at the index is a high-surrogate unit, the next index is less than the length of the sequence and the char unit at the next index is a low surrogate unit, then the code point represented by the pair is returned; otherwise the char unit at the index is returned.

      Parameters

      • seq: The sequence of char units.

      • index: @param index The index into the seq to retrieve and convert.

      Returns

      The Unicode code point.

      Throws

      • NullPointerException: if seq is null.

      • IndexOutOfBoundsException: @throws IndexOutOfBoundsException if the index is negative or greater than or equal to seq.length().

      Since

      1.5

    • codePointAt

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

      Returns the code point at the index in the char[] that's within the limit. If char unit at the index is a high-surrogate unit, the next index is less than the limit and the char unit at the next index is a low surrogate unit, then the code point represented by the pair is returned; otherwise the char unit at the index is returned.

      Parameters

      • seq: The sequence of char units.

      • index: @param index The index into the seq to retrieve and convert.

      • limit: @param limit The exclusive index into the seq that marks the end of the units that can be used.

      Returns

      The Unicode code point.

      Throws

      • NullPointerException: if seq is null.

      • IndexOutOfBoundsException: @throws IndexOutOfBoundsException if the index is negative, greater than or equal to limit, limit is negative or limit is greater than the length of seq.

      Since

      1.5

    • codePointBefore

      public static int codePointBefore(CharSequence seq, int index)

      Returns the Unicode code point that proceeds the index in the CharSequence. If the char unit at index - 1 is within the low surrogate range, the value index - 2 isn't negative and the char unit at index - 2 is within the high surrogate range, then the supplementary code point made up of the surrogate pair is returned; otherwise, the char value at index - 1 is returned.

      Parameters

      • seq: The CharSequence to search.

      • index: The index into the seq.

      Returns

      A Unicode code point.

      Throws

      • NullPointerException: if seq is null.

      • IndexOutOfBoundsException: @throws IndexOutOfBoundsException if index is less than 1 or greater than seq.length().

      Since

      1.5

    • codePointBefore

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

      Returns the Unicode code point that proceeds the index in the char[]. If the char unit at index - 1 is within the low surrogate range, the value index - 2 isn't negative and the char unit at index - 2 is within the high surrogate range, then the supplementary code point made up of the surrogate pair is returned; otherwise, the char value at index - 1 is returned.

      Parameters

      • seq: The char[] to search.

      • index: The index into the seq.

      Returns

      A Unicode code point.

      Throws

      • NullPointerException: if seq is null.

      • IndexOutOfBoundsException: @throws IndexOutOfBoundsException if index is less than 1 or greater than seq.length.

      Since

      1.5

    • codePointBefore

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

      Returns the Unicode code point that proceeds the index in the char[] and isn't less than start. If the char unit at index - 1 is within the low surrogate range, the value index - 2 isn't less than start and the char unit at index - 2 is within the high surrogate range, then the supplementary code point made up of the surrogate pair is returned; otherwise, the char value at index - 1 is returned.

      Parameters

      • seq: The char[] to search.

      • index: The index into the seq.

      Returns

      A Unicode code point.

      Throws

      • NullPointerException: if seq is null.

      • IndexOutOfBoundsException: @throws IndexOutOfBoundsException if index is less than or equal to start, index is greater than seq.length, start is not negative and start is greater than seq.length.

      Since

      1.5

    • toChars

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

      Converts the Unicode code point, codePoint, into a UTF-16 encoded sequence and copies the value(s) into the char[] dst, starting at the index dstIndex.

      Parameters

      • codePoint: The Unicode code point to encode.

      • dst: The char[] to copy the encoded value into.

      • dstIndex: The index to start copying into dst.

      Returns
      Returns:

      The number of char value units copied into dst.

      Throws

      • IllegalArgumentException: @throws IllegalArgumentException if codePoint is not a valid Unicode code point.

      • NullPointerException: if dst is null.

      • IndexOutOfBoundsException: @throws IndexOutOfBoundsException if dstIndex is negative, greater than or equal to dst.length or equals dst.length - 1 when codePoint is a supplementary code point.

      Since

      1.5

    • toChars

      public static char[] toChars(int codePoint)

      Converts the Unicode code point, codePoint, into a UTF-16 encoded sequence that is returned as a char[].

      Parameters
      • codePoint: The Unicode code point to encode.
      Returns
      Returns:

      The UTF-16 encoded char sequence; if code point is a supplementary code point, then a 2 char array is returned, otherwise a 1 char array is returned.

      Throws
      • IllegalArgumentException: @throws IllegalArgumentException if codePoint is not a valid Unicode code point.
      Since

      1.5

    • codePointCount

      public static int codePointCount(CharSequence seq, int beginIndex, int endIndex)

      Counts the number of Unicode code points in the subsequence of the CharSequence, as delineated by the beginIndex and endIndex. Any surrogate values with missing pair values will be counted as 1 code point.

      Parameters

      • seq: The CharSequence to look through.

      • beginIndex: The inclusive index to begin counting at.

      • endIndex: The exclusive index to stop counting at.

      Returns

      The number of Unicode code points.

      Throws

      • NullPointerException: if seq is null.

      • IndexOutOfBoundsException: @throws IndexOutOfBoundsException if beginIndex is negative, greater than seq.length() or greater than endIndex.

      Since

      1.5

    • codePointCount

      public static int codePointCount(char[] seq, int offset, int count)

      Counts the number of Unicode code points in the subsequence of the char[], as delineated by the offset and count. Any surrogate values with missing pair values will be counted as 1 code point.

      Parameters

      • seq: The char[] to look through.

      • offset: The inclusive index to begin counting at.

      • count: @param count The number of char values to look through in seq.

      Returns

      The number of Unicode code points.

      Throws

      • NullPointerException: if seq is null.

      • IndexOutOfBoundsException: @throws IndexOutOfBoundsException if offset or count is negative or if endIndex is greater than seq.length.

      Since

      1.5

    • offsetByCodePoints

      public static int offsetByCodePoints(CharSequence seq, int index, int codePointOffset)

      Determines the index into the CharSequence that is offset (measured in code points and specified by codePointOffset), from the index argument.

      Parameters

      • seq: The CharSequence to find the index within.

      • index: @param index The index to begin from, within the CharSequence.

      • codePointOffset: @param codePointOffset The number of code points to look back or forwards; may be a negative or positive value.

      Returns
      Returns:

      The calculated index that is codePointOffset code points from index.

      Throws

      • NullPointerException: if seq is null.

      • IndexOutOfBoundsException: @throws IndexOutOfBoundsException if index is negative, greater than seq.length(), there aren't enough values in seq after index or before index if codePointOffset is negative.

      Since

      1.5

    • offsetByCodePoints

      public static int offsetByCodePoints(char[] seq, int start, int count, int index, int codePointOffset)

      Determines the index into the char[] that is offset (measured in code points and specified by codePointOffset), from the index argument and is within the subsequence as delineated by start and count.

      Parameters

      • seq: The char[] to find the index within.

      • index: The index to begin from, within the char[].

      • codePointOffset: @param codePointOffset The number of code points to look back or forwards; may be a negative or positive value.

      • start: @param start The inclusive index that marks the beginning of the subsequence.

      • count: @param count The number of char values to include within the subsequence.

      Returns
      Returns:

      The calculated index that is codePointOffset code points from index.

      Throws

      • NullPointerException: if seq is null.

      • IndexOutOfBoundsException: @throws IndexOutOfBoundsException if start or count is negative, start + count greater than seq.length, index is less than start, index is greater than start + count or there aren't enough values in seq after index or before index if codePointOffset is negative.

      Since

      1.5

    • reverseBytes

      public static char reverseBytes(char c)

      Reverse the order of the first and second bytes in character

      Parameters
      • c: the character
      Returns

      the character with reordered bytes.

    • valueOf

      public static Character valueOf(char i)

      Returns the object instance of i

      Parameters
      • i: the primitive
      Returns

      object instance

    • isWhitespace

      public static boolean isWhitespace(char c)
      See #isWhitespace(int).

    • isSpace

      public static boolean isSpace(char ch)

    • isSpaceChar

      public static boolean isSpaceChar(char ch)

    • isWhitespace

      public static boolean isWhitespace(int codePoint)
      Returns true if the given code point is a Unicode whitespace character. The exact set of characters considered as whitespace varies with Unicode version. Note that non-breaking spaces are not considered whitespace. Note also that line separators are considered whitespace; see #isSpaceChar for an alternative.

    • toTitleCase

      public static int toTitleCase(int codePoint)

    • toTitleCase

      public static char toTitleCase(char c)

    • digit

      public static int digit(int codePoint, int radix)

    • isLetterOrDigit

      public static boolean isLetterOrDigit(char ch)

    • isLetterOrDigit

      public static boolean isLetterOrDigit(int codePoint)

    • isLetter

      public static boolean isLetter(char ch)

    • isLetter

      public static boolean isLetter(int codePoint)

    • isIdentifierIgnorable

      public static boolean isIdentifierIgnorable(char ch)

    • isIdentifierIgnorable

      public static boolean isIdentifierIgnorable(int codePoint)

    • isDigit

      public static boolean isDigit(int codePoint)

    • isLowerCase

      public static boolean isLowerCase(int codePoint)

    • isUpperCase

      public static boolean isUpperCase(int codePoint)

    • toLowerCase

      public static int toLowerCase(int codePoint)

    • toUpperCase

      public static int toUpperCase(int codePoint)

    • highSurrogate

      public static char highSurrogate(int codePoint)

    • lowSurrogate

      public static char lowSurrogate(int codePoint)

    • isSpaceChar

      public static boolean isSpaceChar(int codePoint)
      Whether the code point is a Unicode space separator, line separator or paragraph separator.

    • getDirectionality

      public static byte getDirectionality(char ch)

    • getType

      public static int getType(char c)

    • isBmpCodePoint

      public static boolean isBmpCodePoint(int codePoint)

    • isSurrogate

      public static boolean isSurrogate(char ch)

    • getType

      public static int getType(int codePoint)

    • compareTo

      public int compareTo(Character another)
      Description copied from interface: Comparable

      Compares this object to the specified object to determine their relative order.

      Parameters
      • another: the object to compare to this instance.
      Returns
      Specified by:
      compareTo in interface Comparable<Character>
      Returns:

      a negative integer if this instance is less than another; a positive integer if this instance is greater than another; 0 if this instance has the same order as another.

      Throws
      • ClassCastException: @throws ClassCastException if another cannot be converted into something comparable to this instance.

    • toString

      public static String toString(char c)
      A one-char string of c.

    • toString

      public static String toString(int codePoint)

      The string of the code point: one char, or a surrogate pair.

      Throws
      • IllegalArgumentException: if it is not a valid code point

    • hashCode

      public static int hashCode(char value)
      The char itself, as the JDK hashes it.

    • compare

      public static int compare(char x, char y)
      x - y.

    • isISOControl

      public static boolean isISOControl(char ch)
      Whether the char is an ISO control character: U+0000 to U+001F or U+007F to U+009F.

    • isISOControl

      public static boolean isISOControl(int codePoint)
      Whether the code point is an ISO control character.

    • forDigit

      public static char forDigit(int digit, int radix)
      The char of digit in radix, a lower case letter from 10 on, or U+0000 when either is out of range.

    • getNumericValue

      public static int getNumericValue(char ch)
      The value of a digit, or of a Latin letter read as a digit of base 36, or -1.

    • getNumericValue

      public static int getNumericValue(int codePoint)
      The value of a digit, or of a Latin letter read as a digit of base 36, or -1.

    • isAlphabetic

      public static boolean isAlphabetic(int codePoint)
      Whether the code point is alphabetic. This runtime answers as for isLetter.

    • isDefined

      public static boolean isDefined(char ch)
      Whether the char has a category in this runtime's classification.

    • isDefined

      public static boolean isDefined(int codePoint)
      Whether the code point has a category in this runtime's classification. Above Latin-1 that classification is partial, so an assigned symbol it does not know answers false.

    • isIdeographic

      public static boolean isIdeographic(int codePoint)

      Whether the code point is a CJK ideograph.

      The blocks whole, unassigned gaps included: which code points inside them are assigned moves with every Unicode release (JDK 8 and JDK 21 answer differently), and this runtime carries no per-version table.

    • isTitleCase

      public static boolean isTitleCase(char ch)
      Whether the char is a title case letter.

    • isTitleCase

      public static boolean isTitleCase(int codePoint)
      Whether the code point is a title case letter.

    • isMirrored

      public static boolean isMirrored(char ch)
      Whether the char is mirrored in right-to-left text: the ASCII brackets and the guillemets.

    • isMirrored

      public static boolean isMirrored(int codePoint)
      Whether the code point is mirrored in right-to-left text. This runtime knows the ASCII brackets and the guillemets.

    • isJavaLetter

      @Deprecated public static boolean isJavaLetter(char ch)
      Deprecated.
      As isJavaIdentifierStart(char).

    • isJavaLetterOrDigit

      @Deprecated public static boolean isJavaLetterOrDigit(char ch)
      Deprecated.
      As isJavaIdentifierPart(char).

    • isUnicodeIdentifierStart

      public static boolean isUnicodeIdentifierStart(char ch)
      Whether the char may start a Unicode identifier.

    • isUnicodeIdentifierStart

      public static boolean isUnicodeIdentifierStart(int codePoint)
      Whether the code point may start a Unicode identifier: a letter.

    • isUnicodeIdentifierPart

      public static boolean isUnicodeIdentifierPart(char ch)
      Whether the char may continue a Unicode identifier.

    • isUnicodeIdentifierPart

      public static boolean isUnicodeIdentifierPart(int codePoint)
      Whether the code point may continue a Unicode identifier: a letter, a digit, connecting punctuation or an ignorable character.