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java.lang
public final class: Character [javadoc | source]
java.lang.Object
   java.lang.Character

All Implemented Interfaces:
    Comparable, java$io$Serializable

The {@code Character} class wraps a value of the primitive type {@code char} in an object. An object of type {@code Character} contains a single field whose type is {@code 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 6.0.0.

The methods and data of class {@code 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:

Unicode Character Representations

The {@code char} data type (and therefore the value that a {@code 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 platform uses the UTF-16 representation in {@code char} arrays and in the {@code String} and {@code StringBuffer} classes. In this representation, supplementary characters are represented as a pair of {@code char} values, the first from the high-surrogates range, (\uD800-\uDBFF), the second from the low-surrogates range (\uDC00-\uDFFF).

A {@code char} value, therefore, represents Basic Multilingual Plane (BMP) code points, including the surrogate code points, or code units of the UTF-16 encoding. An {@code int} value represents all Unicode code points, including supplementary code points. The lower (least significant) 21 bits of {@code 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 {@code char} values is as follows:

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 {@code char} values that are code units of the UTF-16 encoding. For more information on Unicode terminology, refer to the Unicode Glossary.

Nested Class Summary:
public static class  Character.Subset  Instances of this class represent particular subsets of the Unicode character set. The only family of subsets defined in the {@code Character} class is {@link Character.UnicodeBlock}. Other portions of the Java API may define other subsets for their own purposes. 
public static final class  Character.UnicodeBlock  A family of character subsets representing the character blocks in the Unicode specification. Character blocks generally define characters used for a specific script or purpose. A character is contained by at most one Unicode block. 
public static enum class  Character.UnicodeScript  A family of character subsets representing the character scripts defined in the Unicode Standard Annex #24: Script Names. Every Unicode character is assigned to a single Unicode script, either a specific script, such as {@link Character.UnicodeScript#LATIN Latin}, or one of the following three special values, {@link Character.UnicodeScript#INHERITED Inherited}, {@link Character.UnicodeScript#COMMON Common} or {@link Character.UnicodeScript#UNKNOWN Unknown}. 
Field Summary
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 {@code digit} method, the {@code forDigit} method, and the {@code toString} method of class {@code Integer}.
    Also see:
    Character#digit(char, int)
    Character#forDigit(int, int)
    Integer#toString(int, int)
    Integer#valueOf(String)
 
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 {@code digit} method, the {@code forDigit} method, and the {@code toString} method of class {@code Integer}.
    Also see:
    Character#digit(char, int)
    Character#forDigit(int, int)
    Integer#toString(int, int)
    Integer#valueOf(String)
 
public static final  char MIN_VALUE    The constant value of this field is the smallest value of type {@code char}, {@code '\u005Cu0000'}.
    since: 1.0.2 -
 
public static final  char MAX_VALUE    The constant value of this field is the largest value of type {@code char}, {@code '\u005CuFFFF'}.
    since: 1.0.2 -
 
public static final  Class<Character> TYPE    The {@code Class} instance representing the primitive type {@code char}.
    since: 1.1 -
 
public static final  byte UNASSIGNED    General category "Cn" in the Unicode specification.
    since: 1.1 -
 
public static final  byte UPPERCASE_LETTER    General category "Lu" in the Unicode specification.
    since: 1.1 -
 
public static final  byte LOWERCASE_LETTER    General category "Ll" in the Unicode specification.
    since: 1.1 -
 
public static final  byte TITLECASE_LETTER    General category "Lt" in the Unicode specification.
    since: 1.1 -
 
public static final  byte MODIFIER_LETTER    General category "Lm" in the Unicode specification.
    since: 1.1 -
 
public static final  byte OTHER_LETTER    General category "Lo" in the Unicode specification.
    since: 1.1 -
 
public static final  byte NON_SPACING_MARK    General category "Mn" in the Unicode specification.
    since: 1.1 -
 
public static final  byte ENCLOSING_MARK    General category "Me" in the Unicode specification.
    since: 1.1 -
 
public static final  byte COMBINING_SPACING_MARK    General category "Mc" in the Unicode specification.
    since: 1.1 -
 
public static final  byte DECIMAL_DIGIT_NUMBER    General category "Nd" in the Unicode specification.
    since: 1.1 -
 
public static final  byte LETTER_NUMBER    General category "Nl" in the Unicode specification.
    since: 1.1 -
 
public static final  byte OTHER_NUMBER    General category "No" in the Unicode specification.
    since: 1.1 -
 
public static final  byte SPACE_SEPARATOR    General category "Zs" in the Unicode specification.
    since: 1.1 -
 
public static final  byte LINE_SEPARATOR    General category "Zl" in the Unicode specification.
    since: 1.1 -
 
public static final  byte PARAGRAPH_SEPARATOR    General category "Zp" in the Unicode specification.
    since: 1.1 -
 
public static final  byte CONTROL    General category "Cc" in the Unicode specification.
    since: 1.1 -
 
public static final  byte FORMAT    General category "Cf" in the Unicode specification.
    since: 1.1 -
 
public static final  byte PRIVATE_USE    General category "Co" in the Unicode specification.
    since: 1.1 -
 
public static final  byte SURROGATE    General category "Cs" in the Unicode specification.
    since: 1.1 -
 
public static final  byte DASH_PUNCTUATION    General category "Pd" in the Unicode specification.
    since: 1.1 -
 
public static final  byte START_PUNCTUATION    General category "Ps" in the Unicode specification.
    since: 1.1 -
 
public static final  byte END_PUNCTUATION    General category "Pe" in the Unicode specification.
    since: 1.1 -
 
public static final  byte CONNECTOR_PUNCTUATION    General category "Pc" in the Unicode specification.
    since: 1.1 -
 
public static final  byte OTHER_PUNCTUATION    General category "Po" in the Unicode specification.
    since: 1.1 -
 
public static final  byte MATH_SYMBOL    General category "Sm" in the Unicode specification.
    since: 1.1 -
 
public static final  byte CURRENCY_SYMBOL    General category "Sc" in the Unicode specification.
    since: 1.1 -
 
public static final  byte MODIFIER_SYMBOL    General category "Sk" in the Unicode specification.
    since: 1.1 -
 
public static final  byte OTHER_SYMBOL    General category "So" in the Unicode specification.
    since: 1.1 -
 
public static final  byte INITIAL_QUOTE_PUNCTUATION    General category "Pi" in the Unicode specification.
    since: 1.4 -
 
public static final  byte FINAL_QUOTE_PUNCTUATION    General category "Pf" in the Unicode specification.
    since: 1.4 -
 
static final  int ERROR    Error flag. Use int (code point) to avoid confusion with U+FFFF. 
public static final  byte DIRECTIONALITY_UNDEFINED    Undefined bidirectional character type. Undefined {@code char} values have undefined directionality in the Unicode specification.
    since: 1.4 -
 
public static final  byte DIRECTIONALITY_LEFT_TO_RIGHT    Strong bidirectional character type "L" in the Unicode specification.
    since: 1.4 -
 
public static final  byte DIRECTIONALITY_RIGHT_TO_LEFT    Strong bidirectional character type "R" in the Unicode specification.
    since: 1.4 -
 
public static final  byte DIRECTIONALITY_RIGHT_TO_LEFT_ARABIC    Strong bidirectional character type "AL" in the Unicode specification.
    since: 1.4 -
 
public static final  byte DIRECTIONALITY_EUROPEAN_NUMBER    Weak bidirectional character type "EN" in the Unicode specification.
    since: 1.4 -
 
public static final  byte DIRECTIONALITY_EUROPEAN_NUMBER_SEPARATOR    Weak bidirectional character type "ES" in the Unicode specification.
    since: 1.4 -
 
public static final  byte DIRECTIONALITY_EUROPEAN_NUMBER_TERMINATOR    Weak bidirectional character type "ET" in the Unicode specification.
    since: 1.4 -
 
public static final  byte DIRECTIONALITY_ARABIC_NUMBER    Weak bidirectional character type "AN" in the Unicode specification.
    since: 1.4 -
 
public static final  byte DIRECTIONALITY_COMMON_NUMBER_SEPARATOR    Weak bidirectional character type "CS" in the Unicode specification.
    since: 1.4 -
 
public static final  byte DIRECTIONALITY_NONSPACING_MARK    Weak bidirectional character type "NSM" in the Unicode specification.
    since: 1.4 -
 
public static final  byte DIRECTIONALITY_BOUNDARY_NEUTRAL    Weak bidirectional character type "BN" in the Unicode specification.
    since: 1.4 -
 
public static final  byte DIRECTIONALITY_PARAGRAPH_SEPARATOR    Neutral bidirectional character type "B" in the Unicode specification.
    since: 1.4 -
 
public static final  byte DIRECTIONALITY_SEGMENT_SEPARATOR    Neutral bidirectional character type "S" in the Unicode specification.
    since: 1.4 -
 
public static final  byte DIRECTIONALITY_WHITESPACE    Neutral bidirectional character type "WS" in the Unicode specification.
    since: 1.4 -
 
public static final  byte DIRECTIONALITY_OTHER_NEUTRALS    Neutral bidirectional character type "ON" in the Unicode specification.
    since: 1.4 -
 
public static final  byte DIRECTIONALITY_LEFT_TO_RIGHT_EMBEDDING    Strong bidirectional character type "LRE" in the Unicode specification.
    since: 1.4 -
 
public static final  byte DIRECTIONALITY_LEFT_TO_RIGHT_OVERRIDE    Strong bidirectional character type "LRO" in the Unicode specification.
    since: 1.4 -
 
public static final  byte DIRECTIONALITY_RIGHT_TO_LEFT_EMBEDDING    Strong bidirectional character type "RLE" in the Unicode specification.
    since: 1.4 -
 
public static final  byte DIRECTIONALITY_RIGHT_TO_LEFT_OVERRIDE    Strong bidirectional character type "RLO" in the Unicode specification.
    since: 1.4 -
 
public static final  byte DIRECTIONALITY_POP_DIRECTIONAL_FORMAT    Weak bidirectional character type "PDF" in the Unicode specification.
    since: 1.4 -
 
public static final  char MIN_HIGH_SURROGATE    The minimum value of a Unicode high-surrogate code unit in the UTF-16 encoding, constant {@code '\u005CuD800'}. A high-surrogate is also known as a leading-surrogate.
    since: 1.5 -
 
public static final  char MAX_HIGH_SURROGATE    The maximum value of a Unicode high-surrogate code unit in the UTF-16 encoding, constant {@code '\u005CuDBFF'}. A high-surrogate is also known as a leading-surrogate.
    since: 1.5 -
 
public static final  char MIN_LOW_SURROGATE    The minimum value of a Unicode low-surrogate code unit in the UTF-16 encoding, constant {@code '\u005CuDC00'}. A low-surrogate is also known as a trailing-surrogate.
    since: 1.5 -
 
public static final  char MAX_LOW_SURROGATE    The maximum value of a Unicode low-surrogate code unit in the UTF-16 encoding, constant {@code '\u005CuDFFF'}. A low-surrogate is also known as a trailing-surrogate.
    since: 1.5 -
 
public static final  char MIN_SURROGATE    The minimum value of a Unicode surrogate code unit in the UTF-16 encoding, constant {@code '\u005CuD800'}.
    since: 1.5 -
 
public static final  char MAX_SURROGATE    The maximum value of a Unicode surrogate code unit in the UTF-16 encoding, constant {@code '\u005CuDFFF'}.
    since: 1.5 -
 
public static final  int MIN_SUPPLEMENTARY_CODE_POINT    The minimum value of a Unicode supplementary code point, constant {@code U+10000}.
    since: 1.5 -
 
public static final  int MIN_CODE_POINT    The minimum value of a Unicode code point, constant {@code U+0000}.
    since: 1.5 -
 
public static final  int MAX_CODE_POINT    The maximum value of a Unicode code point, constant {@code U+10FFFF}.
    since: 1.5 -
 
public static final  int SIZE    The number of bits used to represent a char value in unsigned binary form, constant {@code 16}.
    since: 1.5 -
 
Constructor:
 public Character(char value) 
Method from java.lang.Character Summary:
charCount,   charValue,   codePointAt,   codePointAt,   codePointAt,   codePointAtImpl,   codePointBefore,   codePointBefore,   codePointBefore,   codePointBeforeImpl,   codePointCount,   codePointCount,   codePointCountImpl,   compare,   compareTo,   digit,   digit,   equals,   forDigit,   getDirectionality,   getDirectionality,   getName,   getNumericValue,   getNumericValue,   getType,   getType,   hashCode,   highSurrogate,   isAlphabetic,   isBmpCodePoint,   isDefined,   isDefined,   isDigit,   isDigit,   isHighSurrogate,   isISOControl,   isISOControl,   isIdentifierIgnorable,   isIdentifierIgnorable,   isIdeographic,   isJavaIdentifierPart,   isJavaIdentifierPart,   isJavaIdentifierStart,   isJavaIdentifierStart,   isJavaLetter,   isJavaLetterOrDigit,   isLetter,   isLetter,   isLetterOrDigit,   isLetterOrDigit,   isLowSurrogate,   isLowerCase,   isLowerCase,   isMirrored,   isMirrored,   isSpace,   isSpaceChar,   isSpaceChar,   isSupplementaryCodePoint,   isSurrogate,   isSurrogatePair,   isTitleCase,   isTitleCase,   isUnicodeIdentifierPart,   isUnicodeIdentifierPart,   isUnicodeIdentifierStart,   isUnicodeIdentifierStart,   isUpperCase,   isUpperCase,   isValidCodePoint,   isWhitespace,   isWhitespace,   lowSurrogate,   offsetByCodePoints,   offsetByCodePoints,   offsetByCodePointsImpl,   reverseBytes,   toChars,   toChars,   toCodePoint,   toLowerCase,   toLowerCase,   toString,   toString,   toSurrogates,   toTitleCase,   toTitleCase,   toUpperCase,   toUpperCase,   toUpperCaseCharArray,   toUpperCaseEx,   valueOf
Methods from java.lang.Object:
clone,   equals,   finalize,   getClass,   hashCode,   notify,   notifyAll,   toString,   wait,   wait,   wait
Method from java.lang.Character Detail:
 public static int charCount(int codePoint) 
    Determines the number of {@code 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.

 public char charValue() 
    Returns the value of this {@code Character} object.
 public static int codePointAt(CharSequence seq,
    int index) 
    Returns the code point at the given index of the {@code CharSequence}. If the {@code char} value at the given index in the {@code CharSequence} is in the high-surrogate range, the following index is less than the length of the {@code CharSequence}, and the {@code 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 {@code char} value at the given index is returned.
 public static int codePointAt(char[] a,
    int index) 
    Returns the code point at the given index of the {@code char} array. If the {@code char} value at the given index in the {@code char} array is in the high-surrogate range, the following index is less than the length of the {@code char} array, and the {@code 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 {@code char} value at the given index is returned.
 public static int codePointAt(char[] a,
    int index,
    int limit) 
    Returns the code point at the given index of the {@code char} array, where only array elements with {@code index} less than {@code limit} can be used. If the {@code char} value at the given index in the {@code char} array is in the high-surrogate range, the following index is less than the {@code limit}, and the {@code 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 {@code char} value at the given index is returned.
 static int codePointAtImpl(char[] a,
    int index,
    int limit) 
 public static int codePointBefore(CharSequence seq,
    int index) 
    Returns the code point preceding the given index of the {@code CharSequence}. If the {@code char} value at {@code (index - 1)} in the {@code CharSequence} is in the low-surrogate range, {@code (index - 2)} is not negative, and the {@code char} value at {@code (index - 2)} in the {@code CharSequence} is in the high-surrogate range, then the supplementary code point corresponding to this surrogate pair is returned. Otherwise, the {@code char} value at {@code (index - 1)} is returned.
 public static int codePointBefore(char[] a,
    int index) 
    Returns the code point preceding the given index of the {@code char} array. If the {@code char} value at {@code (index - 1)} in the {@code char} array is in the low-surrogate range, {@code (index - 2)} is not negative, and the {@code char} value at {@code (index - 2)} in the {@code char} array is in the high-surrogate range, then the supplementary code point corresponding to this surrogate pair is returned. Otherwise, the {@code char} value at {@code (index - 1)} is returned.
 public static int codePointBefore(char[] a,
    int index,
    int start) 
    Returns the code point preceding the given index of the {@code char} array, where only array elements with {@code index} greater than or equal to {@code start} can be used. If the {@code char} value at {@code (index - 1)} in the {@code char} array is in the low-surrogate range, {@code (index - 2)} is not less than {@code start}, and the {@code char} value at {@code (index - 2)} in the {@code char} array is in the high-surrogate range, then the supplementary code point corresponding to this surrogate pair is returned. Otherwise, the {@code char} value at {@code (index - 1)} is returned.
 static int codePointBeforeImpl(char[] a,
    int index,
    int start) 
 public 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. The text range begins at the specified {@code beginIndex} and extends to the {@code char} at index {@code endIndex - 1}. Thus the length (in {@code char}s) of the text range is {@code endIndex-beginIndex}. Unpaired surrogates within the text range count as one code point each.
 public static int codePointCount(char[] a,
    int offset,
    int count) 
    Returns the number of Unicode code points in a subarray of the {@code char} array argument. The {@code offset} argument is the index of the first {@code char} of the subarray and the {@code count} argument specifies the length of the subarray in {@code char}s. Unpaired surrogates within the subarray count as one code point each.
 static int codePointCountImpl(char[] a,
    int offset,
    int count) 
 public static int compare(char x,
    char y) 
    Compares two {@code char} values numerically. The value returned is identical to what would be returned by:
       Character.valueOf(x).compareTo(Character.valueOf(y))
    
 public int compareTo(Character anotherCharacter) 
    Compares two {@code Character} objects numerically.
 public static int digit(char ch,
    int radix) 
    Returns the numeric value of the character {@code ch} in the specified radix.

    If the radix is not in the range {@code MIN_RADIX} ≤ {@code radix} ≤ {@code MAX_RADIX} or if the value of {@code ch} is not a valid digit in the specified radix, {@code -1} is returned. A character is a valid digit if at least one of the following is true:

    • The method {@code isDigit} is {@code 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.
    • The character is one of the uppercase Latin letters {@code 'A'} through {@code 'Z'} and its code is less than {@code radix + 'A' - 10}. In this case, {@code ch - 'A' + 10} is returned.
    • The character is one of the lowercase Latin letters {@code 'a'} through {@code 'z'} and its code is less than {@code radix + 'a' - 10}. In this case, {@code ch - 'a' + 10} is returned.
    • The character is one of the fullwidth uppercase Latin letters A ({@code '\u005CuFF21'}) through Z ({@code '\u005CuFF3A'}) and its code is less than {@code radix + '\u005CuFF21' - 10}. In this case, {@code ch - '\u005CuFF21' + 10} is returned.
    • The character is one of the fullwidth lowercase Latin letters a ({@code '\u005CuFF41'}) through z ({@code '\u005CuFF5A'}) and its code is less than {@code radix + '\u005CuFF41' - 10}. In this case, {@code ch - '\u005CuFF41' + 10} is returned.

    Note: This method cannot handle supplementary characters. To support all Unicode characters, including supplementary characters, use the #digit(int, int) method.

 public static int digit(int codePoint,
    int radix) 
    Returns the numeric value of the specified character (Unicode code point) in the specified radix.

    If the radix is not in the range {@code MIN_RADIX} ≤ {@code radix} ≤ {@code MAX_RADIX} or if the character is not a valid digit in the specified radix, {@code -1} is returned. A character is a valid digit if at least one of the following is true:

    • The method isDigit(codePoint) is {@code 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.
    • The character is one of the uppercase Latin letters {@code 'A'} through {@code 'Z'} and its code is less than {@code radix + 'A' - 10}. In this case, {@code codePoint - 'A' + 10} is returned.
    • The character is one of the lowercase Latin letters {@code 'a'} through {@code 'z'} and its code is less than {@code radix + 'a' - 10}. In this case, {@code codePoint - 'a' + 10} is returned.
    • The character is one of the fullwidth uppercase Latin letters A ({@code '\u005CuFF21'}) through Z ({@code '\u005CuFF3A'}) and its code is less than {@code radix + '\u005CuFF21' - 10}. In this case, {@code codePoint - '\u005CuFF21' + 10} is returned.
    • The character is one of the fullwidth lowercase Latin letters a ({@code '\u005CuFF41'}) through z ({@code '\u005CuFF5A'}) and its code is less than {@code radix + '\u005CuFF41'- 10}. In this case, {@code codePoint - '\u005CuFF41' + 10} is returned.
 public boolean equals(Object obj) 
    Compares this object against the specified object. The result is {@code true} if and only if the argument is not {@code null} and is a {@code Character} object that represents the same {@code char} value as this object.
 public static char forDigit(int digit,
    int radix) 
    Determines the character representation for a specific digit in the specified radix. If the value of {@code radix} is not a valid radix, or the value of {@code digit} is not a valid digit in the specified radix, the null character ({@code '\u005Cu0000'}) is returned.

    The {@code radix} argument is valid if it is greater than or equal to {@code MIN_RADIX} and less than or equal to {@code MAX_RADIX}. The {@code digit} argument is valid if {@code 0 <= digit < radix}.

    If the digit is less than 10, then {@code '0' + digit} is returned. Otherwise, the value {@code 'a' + digit - 10} is returned.

 public static byte getDirectionality(char ch) 
    Returns the Unicode directionality property for the given character. Character directionality is used to calculate the visual ordering of text. The directionality value of undefined {@code char} values is {@code DIRECTIONALITY_UNDEFINED}.

    Note: This method cannot handle supplementary characters. To support all Unicode characters, including supplementary characters, use the #getDirectionality(int) method.

 public static byte getDirectionality(int codePoint) 
    Returns the Unicode directionality property for the given character (Unicode code point). Character directionality is used to calculate the visual ordering of text. The directionality value of undefined character is #DIRECTIONALITY_UNDEFINED .
 public static String getName(int codePoint) 
    Returns the Unicode name of the specified character {@code codePoint}, or null if the code point is unassigned .

    Note: if the specified character is not assigned a name by the UnicodeData file (part of the Unicode Character Database maintained by the Unicode Consortium), the returned name is the same as the result of expression.

    {@code Character.UnicodeBlock.of(codePoint).toString().replace('_', ' ') + " " + Integer.toHexString(codePoint).toUpperCase(Locale.ENGLISH); }
 public static int getNumericValue(char ch) 
    Returns the {@code int} value that the specified Unicode character represents. For example, the character {@code '\u005Cu216C'} (the roman numeral fifty) will return an int with a value of 50.

    The letters A-Z in their uppercase ({@code '\u005Cu0041'} through {@code '\u005Cu005A'}), lowercase ({@code '\u005Cu0061'} through {@code '\u005Cu007A'}), and full width variant ({@code '\u005CuFF21'} through {@code '\u005CuFF3A'} and {@code '\u005CuFF41'} through {@code '\u005CuFF5A'}) forms have numeric values from 10 through 35. This is independent of the Unicode specification, which does not assign numeric values to these {@code 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.

    Note: This method cannot handle supplementary characters. To support all Unicode characters, including supplementary characters, use the #getNumericValue(int) method.

 public static int getNumericValue(int codePoint) 
    Returns the {@code int} value that the specified character (Unicode code point) represents. For example, the character {@code '\u005Cu216C'} (the Roman numeral fifty) will return an {@code int} with a value of 50.

    The letters A-Z in their uppercase ({@code '\u005Cu0041'} through {@code '\u005Cu005A'}), lowercase ({@code '\u005Cu0061'} through {@code '\u005Cu007A'}), and full width variant ({@code '\u005CuFF21'} through {@code '\u005CuFF3A'} and {@code '\u005CuFF41'} through {@code '\u005CuFF5A'}) forms have numeric values from 10 through 35. This is independent of the Unicode specification, which does not assign numeric values to these {@code 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.

 public static int getType(char ch) 
    Returns a value indicating a character's general category.

    Note: This method cannot handle supplementary characters. To support all Unicode characters, including supplementary characters, use the #getType(int) method.

 public static int getType(int codePoint) 
    Returns a value indicating a character's general category.
 public int hashCode() 
    Returns a hash code for this {@code Character}; equal to the result of invoking {@code charValue()}.
 public static char highSurrogate(int codePoint) 
 public static boolean isAlphabetic(int codePoint) 
    Determines if the specified character (Unicode code point) is an alphabet.

    A character is considered to be alphabetic if its general category type, provided by getType(codePoint) , is any of the following:

    • UPPERCASE_LETTER
    • LOWERCASE_LETTER
    • TITLECASE_LETTER
    • MODIFIER_LETTER
    • OTHER_LETTER
    • LETTER_NUMBER
    or it has contributory property Other_Alphabetic as defined by the Unicode Standard.
 public static boolean isBmpCodePoint(int codePoint) 
    Determines whether the specified character (Unicode code point) is in the Basic Multilingual Plane (BMP). Such code points can be represented using a single {@code char}.
 public static boolean isDefined(char ch) 
    Determines if a character is defined in Unicode.

    A character is defined if at least one of the following is true:

    • It has an entry in the UnicodeData file.
    • It has a value in a range defined by the UnicodeData file.

    Note: This method cannot handle supplementary characters. To support all Unicode characters, including supplementary characters, use the #isDefined(int) method.

 public static boolean isDefined(int codePoint) 
    Determines if a character (Unicode code point) is defined in Unicode.

    A character is defined if at least one of the following is true:

    • It has an entry in the UnicodeData file.
    • It has a value in a range defined by the UnicodeData file.
 public static boolean isDigit(char ch) 
    Determines if the specified character is a digit.

    A character is a digit if its general category type, provided by {@code Character.getType(ch)}, is {@code DECIMAL_DIGIT_NUMBER}.

    Some Unicode character ranges that contain digits:

    • {@code '\u005Cu0030'} through {@code '\u005Cu0039'}, ISO-LATIN-1 digits ({@code '0'} through {@code '9'})
    • {@code '\u005Cu0660'} through {@code '\u005Cu0669'}, Arabic-Indic digits
    • {@code '\u005Cu06F0'} through {@code '\u005Cu06F9'}, Extended Arabic-Indic digits
    • {@code '\u005Cu0966'} through {@code '\u005Cu096F'}, Devanagari digits
    • {@code '\u005CuFF10'} through {@code '\u005CuFF19'}, Fullwidth digits
    Many other character ranges contain digits as well.

    Note: This method cannot handle supplementary characters. To support all Unicode characters, including supplementary characters, use the #isDigit(int) method.

 public static boolean isDigit(int codePoint) 
    Determines if the specified character (Unicode code point) is a digit.

    A character is a digit if its general category type, provided by getType(codePoint) , is {@code DECIMAL_DIGIT_NUMBER}.

    Some Unicode character ranges that contain digits:

    • {@code '\u005Cu0030'} through {@code '\u005Cu0039'}, ISO-LATIN-1 digits ({@code '0'} through {@code '9'})
    • {@code '\u005Cu0660'} through {@code '\u005Cu0669'}, Arabic-Indic digits
    • {@code '\u005Cu06F0'} through {@code '\u005Cu06F9'}, Extended Arabic-Indic digits
    • {@code '\u005Cu0966'} through {@code '\u005Cu096F'}, Devanagari digits
    • {@code '\u005CuFF10'} through {@code '\u005CuFF19'}, Fullwidth digits
    Many other character ranges contain digits as well.
 public static boolean isHighSurrogate(char ch) 
 public static boolean isISOControl(char ch) 
    Determines if the specified character is an ISO control character. A character is considered to be an ISO control character if its code is in the range {@code '\u005Cu0000'} through {@code '\u005Cu001F'} or in the range {@code '\u005Cu007F'} through {@code '\u005Cu009F'}.

    Note: This method cannot handle supplementary characters. To support all Unicode characters, including supplementary characters, use the #isISOControl(int) method.

 public static boolean isISOControl(int codePoint) 
    Determines if the referenced character (Unicode code point) is an ISO control character. A character is considered to be an ISO control character if its code is in the range {@code '\u005Cu0000'} through {@code '\u005Cu001F'} or in the range {@code '\u005Cu007F'} through {@code '\u005Cu009F'}.
 public 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.

    The following Unicode characters are ignorable in a Java identifier or a Unicode identifier:

    • ISO control characters that are not whitespace
      • {@code '\u005Cu0000'} through {@code '\u005Cu0008'}
      • {@code '\u005Cu000E'} through {@code '\u005Cu001B'}
      • {@code '\u005Cu007F'} through {@code '\u005Cu009F'}
    • all characters that have the {@code FORMAT} general category value

    Note: This method cannot handle supplementary characters. To support all Unicode characters, including supplementary characters, use the #isIdentifierIgnorable(int) method.

 public 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.

    The following Unicode characters are ignorable in a Java identifier or a Unicode identifier:

    • ISO control characters that are not whitespace
      • {@code '\u005Cu0000'} through {@code '\u005Cu0008'}
      • {@code '\u005Cu000E'} through {@code '\u005Cu001B'}
      • {@code '\u005Cu007F'} through {@code '\u005Cu009F'}
    • all characters that have the {@code FORMAT} general category value
 public static boolean isIdeographic(int codePoint) 
    Determines if the specified character (Unicode code point) is a CJKV (Chinese, Japanese, Korean and Vietnamese) ideograph, as defined by the Unicode Standard.
 public static boolean isJavaIdentifierPart(char ch) 
    Determines if the specified character may be part of a Java identifier as other than the first character.

    A character may be part of a Java identifier if any of the following are true:

    • it is a letter
    • it is a currency symbol (such as {@code '$'})
    • it is a connecting punctuation character (such as {@code '_'})
    • it is a digit
    • it is a numeric letter (such as a Roman numeral character)
    • it is a combining mark
    • it is a non-spacing mark
    • {@code isIdentifierIgnorable} returns {@code true} for the character

    Note: This method cannot handle supplementary characters. To support all Unicode characters, including supplementary characters, use the #isJavaIdentifierPart(int) method.

 public 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.

    A character may be part of a Java identifier if any of the following are true:

    • it is a letter
    • it is a currency symbol (such as {@code '$'})
    • it is a connecting punctuation character (such as {@code '_'})
    • it is a digit
    • it is a numeric letter (such as a Roman numeral character)
    • it is a combining mark
    • it is a non-spacing mark
    • isIdentifierIgnorable(codePoint) returns {@code true} for the character
 public static boolean isJavaIdentifierStart(char ch) 
    Determines if the specified character is permissible as the first character in a Java identifier.

    A character may start a Java identifier if and only if one of the following conditions is true:

    • isLetter(ch) returns {@code true}
    • getType(ch) returns {@code LETTER_NUMBER}
    • {@code ch} is a currency symbol (such as {@code '$'})
    • {@code ch} is a connecting punctuation character (such as {@code '_'}).

    Note: This method cannot handle supplementary characters. To support all Unicode characters, including supplementary characters, use the #isJavaIdentifierStart(int) method.

 public static boolean isJavaIdentifierStart(int codePoint) 
    Determines if the character (Unicode code point) is permissible as the first character in a Java identifier.

    A character may start a Java identifier if and only if one of the following conditions is true:

    • isLetter(codePoint) returns {@code true}
    • getType(codePoint) returns {@code LETTER_NUMBER}
    • the referenced character is a currency symbol (such as {@code '$'})
    • the referenced character is a connecting punctuation character (such as {@code '_'}).
 public static boolean isJavaLetter(char ch) 
Deprecated! Replaced - by isJavaIdentifierStart(char).

    Determines if the specified character is permissible as the first character in a Java identifier.

    A character may start a Java identifier if and only if one of the following is true:

    • isLetter(ch) returns {@code true}
    • getType(ch) returns {@code LETTER_NUMBER}
    • {@code ch} is a currency symbol (such as {@code '$'})
    • {@code ch} is a connecting punctuation character (such as {@code '_'}).
 public static boolean isJavaLetterOrDigit(char ch) 
Deprecated! Replaced - by isJavaIdentifierPart(char).

    Determines if the specified character may be part of a Java identifier as other than the first character.

    A character may be part of a Java identifier if and only if any of the following are true:

    • it is a letter
    • it is a currency symbol (such as {@code '$'})
    • it is a connecting punctuation character (such as {@code '_'})
    • it is a digit
    • it is a numeric letter (such as a Roman numeral character)
    • it is a combining mark
    • it is a non-spacing mark
    • {@code isIdentifierIgnorable} returns {@code true} for the character.
 public static boolean isLetter(char ch) 
    Determines if the specified character is a letter.

    A character is considered to be a letter if its general category type, provided by {@code Character.getType(ch)}, is any of the following:

    • {@code UPPERCASE_LETTER}
    • {@code LOWERCASE_LETTER}
    • {@code TITLECASE_LETTER}
    • {@code MODIFIER_LETTER}
    • {@code OTHER_LETTER}
    Not all letters have case. Many characters are letters but are neither uppercase nor lowercase nor titlecase.

    Note: This method cannot handle supplementary characters. To support all Unicode characters, including supplementary characters, use the #isLetter(int) method.

 public static boolean isLetter(int codePoint) 
    Determines if the specified character (Unicode code point) is a letter.

    A character is considered to be a letter if its general category type, provided by getType(codePoint) , is any of the following:

    • {@code UPPERCASE_LETTER}
    • {@code LOWERCASE_LETTER}
    • {@code TITLECASE_LETTER}
    • {@code MODIFIER_LETTER}
    • {@code OTHER_LETTER}
    Not all letters have case. Many characters are letters but are neither uppercase nor lowercase nor titlecase.
 public static boolean isLetterOrDigit(char ch) 
    Determines if the specified character is a letter or digit.

    A character is considered to be a letter or digit if either {@code Character.isLetter(char ch)} or {@code Character.isDigit(char ch)} returns {@code true} for the character.

    Note: This method cannot handle supplementary characters. To support all Unicode characters, including supplementary characters, use the #isLetterOrDigit(int) method.

 public static boolean isLetterOrDigit(int codePoint) 
    Determines if the specified character (Unicode code point) is a letter or digit.

    A character is considered to be a letter or digit if either isLetter(codePoint) or isDigit(codePoint) returns {@code true} for the character.

 public static boolean isLowSurrogate(char ch) 
 public static boolean isLowerCase(char ch) 
    Determines if the specified character is a lowercase character.

    A character is lowercase if its general category type, provided by {@code Character.getType(ch)}, is {@code LOWERCASE_LETTER}, or it has contributory property Other_Lowercase as defined by the Unicode Standard.

    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.

    Note: This method cannot handle supplementary characters. To support all Unicode characters, including supplementary characters, use the #isLowerCase(int) method.

 public static boolean isLowerCase(int codePoint) 
    Determines if the specified character (Unicode code point) is a lowercase character.

    A character is lowercase if its general category type, provided by getType(codePoint) , is {@code LOWERCASE_LETTER}, or it has contributory property Other_Lowercase as defined by the Unicode Standard.

    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.

 public static boolean isMirrored(char ch) 
    Determines whether the character is mirrored according to the Unicode specification. Mirrored characters should have their glyphs horizontally mirrored when displayed in text that is right-to-left. For example, {@code '\u005Cu0028'} 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.

    Note: This method cannot handle supplementary characters. To support all Unicode characters, including supplementary characters, use the #isMirrored(int) method.

 public static boolean isMirrored(int codePoint) 
    Determines whether the specified character (Unicode code point) is mirrored according to the Unicode specification. Mirrored characters should have their glyphs horizontally mirrored when displayed in text that is right-to-left. For example, {@code '\u005Cu0028'} 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.
 public static boolean isSpace(char ch) 
Deprecated! Replaced - by isWhitespace(char).

    Determines if the specified character is ISO-LATIN-1 white space. This method returns {@code true} for the following five characters only:
    {@code '\t'} {@code U+0009} {@code HORIZONTAL TABULATION}
    {@code '\n'} {@code U+000A} {@code NEW LINE}
    {@code '\f'} {@code U+000C} {@code FORM FEED}
    {@code '\r'} {@code U+000D} {@code CARRIAGE RETURN}
    {@code ' '} {@code U+0020} {@code SPACE}
 public static boolean isSpaceChar(char ch) 
    Determines if the specified character is a Unicode space character. A character is considered to be a space character if and only if it is specified to be a space character by the Unicode Standard. This method returns true if the character's general category type is any of the following:
    • {@code SPACE_SEPARATOR}
    • {@code LINE_SEPARATOR}
    • {@code PARAGRAPH_SEPARATOR}

    Note: This method cannot handle supplementary characters. To support all Unicode characters, including supplementary characters, use the #isSpaceChar(int) method.

 public static boolean isSpaceChar(int codePoint) 
    Determines if the specified character (Unicode code point) is a Unicode space character. A character is considered to be a space character if and only if it is specified to be a space character by the Unicode Standard. This method returns true if the character's general category type is any of the following:
 public static boolean isSupplementaryCodePoint(int codePoint) 
 public static boolean isSurrogate(char ch) 
    Determines if the given {@code char} value is a Unicode 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.

    A char value is a surrogate code unit if and only if it is either a {@linkplain #isLowSurrogate(char) low-surrogate code unit} or a {@linkplain #isHighSurrogate(char) high-surrogate code unit}.

 public static boolean isSurrogatePair(char high,
    char low) 
    Determines whether the specified pair of {@code char} values is a valid Unicode surrogate pair.

    This method is equivalent to the expression:

    isHighSurrogate(high) && isLowSurrogate(low)
    
 public static boolean isTitleCase(char ch) 
    Determines if the specified character is a titlecase character.

    A character is a titlecase character if its general category type, provided by {@code Character.getType(ch)}, is {@code 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 {@code true}:

    • {@code LATIN CAPITAL LETTER D WITH SMALL LETTER Z WITH CARON}
    • {@code LATIN CAPITAL LETTER L WITH SMALL LETTER J}
    • {@code LATIN CAPITAL LETTER N WITH SMALL LETTER J}
    • {@code LATIN CAPITAL LETTER D WITH SMALL LETTER Z}

    Many other Unicode characters are titlecase too.

    Note: This method cannot handle supplementary characters. To support all Unicode characters, including supplementary characters, use the #isTitleCase(int) method.

 public static boolean isTitleCase(int codePoint) 
    Determines if the specified character (Unicode code point) is a titlecase character.

    A character is a titlecase character if its general category type, provided by getType(codePoint) , is {@code 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 {@code true}:

    • {@code LATIN CAPITAL LETTER D WITH SMALL LETTER Z WITH CARON}
    • {@code LATIN CAPITAL LETTER L WITH SMALL LETTER J}
    • {@code LATIN CAPITAL LETTER N WITH SMALL LETTER J}
    • {@code LATIN CAPITAL LETTER D WITH SMALL LETTER Z}

    Many other Unicode characters are titlecase too.

 public static boolean isUnicodeIdentifierPart(char ch) 
    Determines if the specified character may be part of a Unicode identifier as other than the first character.

    A character may be part of a Unicode identifier if and only if one of the following statements is true:

    • it is a letter
    • it is a connecting punctuation character (such as {@code '_'})
    • it is a digit
    • it is a numeric letter (such as a Roman numeral character)
    • it is a combining mark
    • it is a non-spacing mark
    • {@code isIdentifierIgnorable} returns {@code true} for this character.

    Note: This method cannot handle supplementary characters. To support all Unicode characters, including supplementary characters, use the #isUnicodeIdentifierPart(int) method.

 public 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.

    A character may be part of a Unicode identifier if and only if one of the following statements is true:

    • it is a letter
    • it is a connecting punctuation character (such as {@code '_'})
    • it is a digit
    • it is a numeric letter (such as a Roman numeral character)
    • it is a combining mark
    • it is a non-spacing mark
    • {@code isIdentifierIgnorable} returns {@code true} for this character.
 public static boolean isUnicodeIdentifierStart(char ch) 
    Determines if the specified character is permissible as the first character in a Unicode identifier.

    A character may start a Unicode identifier if and only if one of the following conditions is true:

    Note: This method cannot handle supplementary characters. To support all Unicode characters, including supplementary characters, use the #isUnicodeIdentifierStart(int) method.

 public static boolean isUnicodeIdentifierStart(int codePoint) 
    Determines if the specified character (Unicode code point) is permissible as the first character in a Unicode identifier.

    A character may start a Unicode identifier if and only if one of the following conditions is true:

 public static boolean isUpperCase(char ch) 
    Determines if the specified character is an uppercase character.

    A character is uppercase if its general category type, provided by {@code Character.getType(ch)}, is {@code UPPERCASE_LETTER}. or it has contributory property Other_Uppercase as defined by the Unicode Standard.

    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.

    Note: This method cannot handle supplementary characters. To support all Unicode characters, including supplementary characters, use the #isUpperCase(int) method.

 public static boolean isUpperCase(int codePoint) 
    Determines if the specified character (Unicode code point) is an uppercase character.

    A character is uppercase if its general category type, provided by getType(codePoint) , is {@code UPPERCASE_LETTER}, or it has contributory property Other_Uppercase as defined by the Unicode Standard.

    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.

 public static boolean isValidCodePoint(int codePoint) 
 public static boolean isWhitespace(char ch) 
    Determines if the specified character is white space according to Java. A character is a Java whitespace character if and only if it satisfies one of the following criteria:
    • It is a Unicode space character ({@code SPACE_SEPARATOR}, {@code LINE_SEPARATOR}, or {@code PARAGRAPH_SEPARATOR}) but is not also a non-breaking space ({@code '\u005Cu00A0'}, {@code '\u005Cu2007'}, {@code '\u005Cu202F'}).
    • It is {@code '\u005Ct'}, U+0009 HORIZONTAL TABULATION.
    • It is {@code '\u005Cn'}, U+000A LINE FEED.
    • It is {@code '\u005Cu000B'}, U+000B VERTICAL TABULATION.
    • It is {@code '\u005Cf'}, U+000C FORM FEED.
    • It is {@code '\u005Cr'}, U+000D CARRIAGE RETURN.
    • It is {@code '\u005Cu001C'}, U+001C FILE SEPARATOR.
    • It is {@code '\u005Cu001D'}, U+001D GROUP SEPARATOR.
    • It is {@code '\u005Cu001E'}, U+001E RECORD SEPARATOR.
    • It is {@code '\u005Cu001F'}, U+001F UNIT SEPARATOR.

    Note: This method cannot handle supplementary characters. To support all Unicode characters, including supplementary characters, use the #isWhitespace(int) method.

 public static boolean isWhitespace(int codePoint) 
    Determines if the specified character (Unicode code point) is white space according to Java. A character is a Java whitespace character if and only if it satisfies one of the following criteria:
    • It is a Unicode space character (#SPACE_SEPARATOR , #LINE_SEPARATOR , or #PARAGRAPH_SEPARATOR ) but is not also a non-breaking space ({@code '\u005Cu00A0'}, {@code '\u005Cu2007'}, {@code '\u005Cu202F'}).
    • It is {@code '\u005Ct'}, U+0009 HORIZONTAL TABULATION.
    • It is {@code '\u005Cn'}, U+000A LINE FEED.
    • It is {@code '\u005Cu000B'}, U+000B VERTICAL TABULATION.
    • It is {@code '\u005Cf'}, U+000C FORM FEED.
    • It is {@code '\u005Cr'}, U+000D CARRIAGE RETURN.
    • It is {@code '\u005Cu001C'}, U+001C FILE SEPARATOR.
    • It is {@code '\u005Cu001D'}, U+001D GROUP SEPARATOR.
    • It is {@code '\u005Cu001E'}, U+001E RECORD SEPARATOR.
    • It is {@code '\u005Cu001F'}, U+001F UNIT SEPARATOR.

 public static char lowSurrogate(int codePoint) 
 public static int offsetByCodePoints(CharSequence seq,
    int index,
    int codePointOffset) 
    Returns the index within the given char sequence that is offset from the given {@code index} by {@code codePointOffset} code points. Unpaired surrogates within the text range given by {@code index} and {@code codePointOffset} count as one code point each.
 public static int offsetByCodePoints(char[] a,
    int start,
    int count,
    int index,
    int codePointOffset) 
    Returns the index within the given {@code char} subarray that is offset from the given {@code index} by {@code codePointOffset} code points. The {@code start} and {@code count} arguments specify a subarray of the {@code char} array. Unpaired surrogates within the text range given by {@code index} and {@code codePointOffset} count as one code point each.
 static int offsetByCodePointsImpl(char[] a,
    int start,
    int count,
    int index,
    int codePointOffset) 
 public static char reverseBytes(char ch) 
    Returns the value obtained by reversing the order of the bytes in the specified char value.
 public static char[] toChars(int codePoint) 
    Converts the specified character (Unicode code point) to its UTF-16 representation stored in a {@code char} array. If the specified code point is a BMP (Basic Multilingual Plane or Plane 0) value, the resulting {@code char} array has the same value as {@code codePoint}. If the specified code point is a supplementary code point, the resulting {@code char} array has the corresponding surrogate pair.
 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 {@code dst[dstIndex]}, and 1 is returned. If the specified code point is a supplementary character, its surrogate values are stored in {@code dst[dstIndex]} (high-surrogate) and {@code dst[dstIndex+1]} (low-surrogate), and 2 is returned.
 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.
 public static char toLowerCase(char ch) 
    Converts the character argument to lowercase using case mapping information from the UnicodeData file.

    Note that {@code Character.isLowerCase(Character.toLowerCase(ch))} does not always return {@code true} for some ranges of characters, particularly those that are symbols or ideographs.

    In general, String#toLowerCase() should be used to map characters to lowercase. {@code String} case mapping methods have several benefits over {@code Character} case mapping methods. {@code String} case mapping methods can perform locale-sensitive mappings, context-sensitive mappings, and 1:M character mappings, whereas the {@code Character} case mapping methods cannot.

    Note: This method cannot handle supplementary characters. To support all Unicode characters, including supplementary characters, use the #toLowerCase(int) method.

 public static int toLowerCase(int codePoint) 
    Converts the character (Unicode code point) argument to lowercase using case mapping information from the UnicodeData file.

    Note that {@code Character.isLowerCase(Character.toLowerCase(codePoint))} does not always return {@code true} for some ranges of characters, particularly those that are symbols or ideographs.

    In general, String#toLowerCase() should be used to map characters to lowercase. {@code String} case mapping methods have several benefits over {@code Character} case mapping methods. {@code String} case mapping methods can perform locale-sensitive mappings, context-sensitive mappings, and 1:M character mappings, whereas the {@code Character} case mapping methods cannot.

 public String toString() 
    Returns a {@code String} object representing this {@code Character}'s value. The result is a string of length 1 whose sole component is the primitive {@code char} value represented by this {@code Character} object.
 public static String toString(char c) 
    Returns a {@code String} object representing the specified {@code char}. The result is a string of length 1 consisting solely of the specified {@code char}.
 static  void toSurrogates(int codePoint,
    char[] dst,
    int index) 
 public static char toTitleCase(char ch) 
    Converts the character argument to titlecase using case mapping information from the UnicodeData file. If a character has no explicit titlecase mapping and is not itself a titlecase char according to UnicodeData, then the uppercase mapping is returned as an equivalent titlecase mapping. If the {@code char} argument is already a titlecase {@code char}, the same {@code char} value will be returned.

    Note that {@code Character.isTitleCase(Character.toTitleCase(ch))} does not always return {@code true} for some ranges of characters.

    Note: This method cannot handle supplementary characters. To support all Unicode characters, including supplementary characters, use the #toTitleCase(int) method.

 public static int toTitleCase(int codePoint) 
    Converts the character (Unicode code point) argument to titlecase using case mapping information from the UnicodeData file. If a character has no explicit titlecase mapping and is not itself a titlecase char according to UnicodeData, then the uppercase mapping is returned as an equivalent titlecase mapping. If the character argument is already a titlecase character, the same character value will be returned.

    Note that {@code Character.isTitleCase(Character.toTitleCase(codePoint))} does not always return {@code true} for some ranges of characters.

 public static char toUpperCase(char ch) 
    Converts the character argument to uppercase using case mapping information from the UnicodeData file.

    Note that {@code Character.isUpperCase(Character.toUpperCase(ch))} does not always return {@code true} for some ranges of characters, particularly those that are symbols or ideographs.

    In general, String#toUpperCase() should be used to map characters to uppercase. {@code String} case mapping methods have several benefits over {@code Character} case mapping methods. {@code String} case mapping methods can perform locale-sensitive mappings, context-sensitive mappings, and 1:M character mappings, whereas the {@code Character} case mapping methods cannot.

    Note: This method cannot handle supplementary characters. To support all Unicode characters, including supplementary characters, use the #toUpperCase(int) method.

 public static int toUpperCase(int codePoint) 
    Converts the character (Unicode code point) argument to uppercase using case mapping information from the UnicodeData file.

    Note that {@code Character.isUpperCase(Character.toUpperCase(codePoint))} does not always return {@code true} for some ranges of characters, particularly those that are symbols or ideographs.

    In general, String#toUpperCase() should be used to map characters to uppercase. {@code String} case mapping methods have several benefits over {@code Character} case mapping methods. {@code String} case mapping methods can perform locale-sensitive mappings, context-sensitive mappings, and 1:M character mappings, whereas the {@code Character} case mapping methods cannot.

 static char[] toUpperCaseCharArray(int codePoint) 
    Converts the character (Unicode code point) argument to uppercase using case mapping information from the SpecialCasing file in the Unicode specification. If a character has no explicit uppercase mapping, then the {@code char} itself is returned in the {@code char[]}.
 static int toUpperCaseEx(int codePoint) 
    Converts the character (Unicode code point) argument to uppercase using information from the UnicodeData file.

 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. This method will always cache values in the range {@code '\u005Cu0000'} to {@code '\u005Cu007F'}, inclusive, and may cache other values outside of this range.