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

See also

digit(char, int), forDigit(int, int), toString(int, int), valueOf(java.lang.String)

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

See also

digit(char, int), forDigit(int, int), toString(int, int), valueOf(java.lang.String)

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

since

1.0.2

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

since

1.0.2

The Class instance representing the primitive type char.

since

1.1

General category "Cn" in the Unicode specification.

since

1.1

General category "Lu" in the Unicode specification.

since

1.1

General category "Ll" in the Unicode specification.

since

1.1

General category "Lt" in the Unicode specification.

since

1.1

General category "Lm" in the Unicode specification.

since

1.1

General category "Lo" in the Unicode specification.

since

1.1

General category "Mn" in the Unicode specification.

since

1.1

General category "Me" in the Unicode specification.

since

1.1

General category "Mc" in the Unicode specification.

since

1.1

General category "Nd" in the Unicode specification.

since

1.1

General category "Nl" in the Unicode specification.

since

1.1

General category "No" in the Unicode specification.

since

1.1

General category "Zs" in the Unicode specification.

since

1.1

General category "Zl" in the Unicode specification.

since

1.1

General category "Zp" in the Unicode specification.

since

1.1

General category "Cc" in the Unicode specification.

since

1.1

General category "Cf" in the Unicode specification.

since

1.1

General category "Co" in the Unicode specification.

since

1.1

General category "Cs" in the Unicode specification.

since

1.1

General category "Pd" in the Unicode specification.

since

1.1

General category "Ps" in the Unicode specification.

since

1.1

General category "Pe" in the Unicode specification.

since

1.1

General category "Pc" in the Unicode specification.

since

1.1

General category "Po" in the Unicode specification.

since

1.1

General category "Sm" in the Unicode specification.

since

1.1

General category "Sc" in the Unicode specification.

since

1.1

General category "Sk" in the Unicode specification.

since

1.1

General category "So" in the Unicode specification.

since

1.1

General category "Pi" in the Unicode specification.

since

1.4

General category "Pf" in the Unicode specification.

since

1.4

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

since

1.4

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

since

1.4

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

since

1.4

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

since

1.4

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

since

1.4

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

since

1.4

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

since

1.4

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

since

1.4

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

since

1.4

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

since

1.4

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

since

1.4

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

since

1.4

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

since

1.4

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

since

1.4

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

since

1.4

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

since

1.4

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

since

1.4

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

since

1.4

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

since

1.4

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

since

1.4

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

since

1.5

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

since

1.5

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

since

1.5

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

since

1.5

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

since

1.5

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

since

1.5

The minimum value of a supplementary code point.

since

1.5

The minimum value of a Unicode code point.

since

1.5

The maximum value of a Unicode code point.

since

1.5

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

since

1.5

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

value

the value to be represented by the Character object.

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

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

codePoint	the character (Unicode code point) to be tested.
return	2 if the character is a valid supplementary character; 1 otherwise.
since	1.5
See also	isSupplementaryCodePoint(int)

Returns the value of this Character object.

return

the primitive char value represented by this object.

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

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

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

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

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

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

Returns the code point preceding the given index of the CharSequence. If the char value at (index - 1) in the CharSequence is in the low-surrogate range, (index - 2) is not negative, and the char value at (index - 2) in the CharSequence is in the high-surrogate range, then the supplementary code point corresponding to this surrogate pair is returned. Otherwise, the char value at (index - 1) is returned.

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

Returns the code point preceding the given index of the char array. If the char value at (index - 1) in the char array is in the low-surrogate range, (index - 2) is not negative, and the char value at (index - 2) in the char array is in the high-surrogate range, then the supplementary code point corresponding to this surrogate pair is returned. Otherwise, the char value at (index - 1) is returned.

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

Returns the code point preceding the given index of the char array, where only array elements with index greater than or equal to start can be used. If the char value at (index - 1) in the char array is in the low-surrogate range, (index - 2) is not less than start, and the char value at (index - 2) in the char array is in the high-surrogate range, then the supplementary code point corresponding to this surrogate pair is returned. Otherwise, the char value at (index - 1) is returned.

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

Returns the number of Unicode code points in the text range of the specified char sequence. The text range begins at the specified beginIndex and extends to the char at index endIndex - 1. Thus the length (in chars) of the text range is endIndex-beginIndex. Unpaired surrogates within the text range count as one code point each.

seq	the char sequence
beginIndex	the index to the first char of the text range.
endIndex	the index after the last char of the text range.
return	the number of Unicode code points in the specified text range
Throws	NullPointerException: if seq is null.
Throws	IndexOutOfBoundsException: if the beginIndex is negative, or endIndex is larger than the length of the given sequence, or beginIndex is larger than endIndex.
since	1.5

Returns the number of Unicode code points in a subarray of the char array argument. The offset argument is the index of the first char of the subarray and the count argument specifies the length of the subarray in chars. Unpaired surrogates within the subarray count as one code point each.

a	the char array
offset	the index of the first char in the given char array
count	the length of the subarray in chars
return	the number of Unicode code points in the specified subarray
Throws	NullPointerException: if a is null.
Throws	IndexOutOfBoundsException: if offset or count is negative, or if offset + count is larger than the length of the given array.
since	1.5

Compares two Character objects numerically.

anotherCharacter	the Character to be compared.
return	the value 0 if the argument Character is equal to this Character; a value less than 0 if this Character is numerically less than the Character argument; and a value greater than 0 if this Character is numerically greater than the Character argument (unsigned comparison). Note that this is strictly a numerical comparison; it is not locale-dependent.
since	1.2

Returns the numeric value of the character ch in the specified radix.

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

• The method isDigit is true of the character and the Unicode decimal digit value of the character (or its single-character decomposition) is less than the specified radix. In this case the decimal digit value is returned.
• The character is one of the uppercase Latin letters 'A' through 'Z' and its code is less than radix + 'A' - 10. In this case, ch - 'A' + 10 is returned.
• The character is one of the lowercase Latin letters 'a' through 'z' and its code is less than radix + 'a' - 10. In this case, ch - 'a' + 10 is returned.

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

ch	the character to be converted.
radix	the radix.
return	the numeric value represented by the character in the specified radix.
See also	forDigit(int, int), isDigit(char)

Returns the numeric value of the specified character (Unicode code point) in the specified radix.

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

• The method isDigit(codePoint) is true of the character and the Unicode decimal digit value of the character (or its single-character decomposition) is less than the specified radix. In this case the decimal digit value is returned.
• The character is one of the uppercase Latin letters 'A' through 'Z' and its code is less than radix + 'A' - 10. In this case, ch - 'A' + 10 is returned.
• The character is one of the lowercase Latin letters 'a' through 'z' and its code is less than radix + 'a' - 10. In this case, ch - 'a' + 10 is returned.

codePoint	the character (Unicode code point) to be converted.
radix	the radix.
return	the numeric value represented by the character in the specified radix.
since	1.5
See also	forDigit(int, int), isDigit(int)

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.

obj	the object to compare with.
return	true if the objects are the same; false otherwise.

Determines the character representation for a specific digit in the specified radix. If the value of radix is not a valid radix, or the value of digit is not a valid digit in the specified radix, the null character ('\u0000') is returned.

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

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

digit	the number to convert to a character.
radix	the radix.
return	the char representation of the specified digit in the specified radix.
See also	MIN_RADIX, MAX_RADIX, digit(char, int)

Returns a hash code for this Character.

return

a hash code value for this object.

Returns the index within the given char sequence that is offset from the given index by codePointOffset code points. Unpaired surrogates within the text range given by index and codePointOffset count as one code point each.

seq	the char sequence
index	the index to be offset
codePointOffset	the offset in code points
return	the index within the char sequence
Throws	NullPointerException: if seq is null.
Throws	IndexOutOfBoundsException: if index is negative or larger then the length of the char sequence, or if codePointOffset is positive and the subsequence starting with index has fewer than codePointOffset code points, or if codePointOffset is negative and the subsequence before index has fewer than the absolute value of codePointOffset code points.
since	1.5

Returns the index within the given char subarray that is offset from the given index by codePointOffset code points. The start and count arguments specify a subarray of the char array. Unpaired surrogates within the text range given by index and codePointOffset count as one code point each.

a	the char array
start	the index of the first char of the subarray
count	the length of the subarray in chars
index	the index to be offset
codePointOffset	the offset in code points
return	the index within the subarray
Throws	NullPointerException: if a is null.
Throws	IndexOutOfBoundsException: if start or count is negative, or if start + count is larger than the length of the given array, or if index is less than start or larger then start + count, or if codePointOffset is positive and the text range starting with index and ending with start + count - 1 has fewer than codePointOffset code points, or if codePointOffset is negative and the text range starting with start and ending with index - 1 has fewer than the absolute value of codePointOffset code points.
since	1.5

Returns the value obtained by reversing the order of the bytes in the specified char value.

return	the value obtained by reversing (or, equivalently, swapping) the bytes in the specified char value.
since	1.5

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

codePoint	the character (Unicode code point) to be converted.
dst	an array of char in which the codePoint's UTF-16 value is stored.
dstIndex	the start index into the dst array where the converted value is stored.
return	1 if the code point is a BMP code point, 2 if the code point is a supplementary code point.
Throws	IllegalArgumentException: if the specified codePoint is not a valid Unicode code point.
Throws	NullPointerException: if the specified dst is null.
Throws	IndexOutOfBoundsException: if dstIndex is negative or not less than dst.length, or if dst at dstIndex doesn't have enough array element(s) to store the resulting char value(s). (If dstIndex is equal to dst.length-1 and the specified codePoint is a supplementary character, the high-surrogate value is not stored in dst[dstIndex].)
since	1.5

Converts the specified character (Unicode code point) to its UTF-16 representation stored in a char array. If the specified code point is a BMP (Basic Multilingual Plane or Plane 0) value, the resulting char array has the same value as codePoint. If the specified code point is a supplementary code point, the resulting char array has the corresponding surrogate pair.

codePoint	a Unicode code point
return	a char array having codePoint's UTF-16 representation.
Throws	IllegalArgumentException: if the specified codePoint is not a valid Unicode code point.
since	1.5

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.

high	the high-surrogate code unit
low	the low-surrogate code unit
return	the supplementary code point composed from the specified surrogate pair.
since	1.5

Converts the character argument to lowercase using case mapping information from the UnicodeData file.

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

In general, java.lang.String#toLowerCase() should be used to map characters to lowercase. String case mapping methods have several benefits over Character case mapping methods. String case mapping methods can perform locale-sensitive mappings, context-sensitive mappings, and 1:M character mappings, whereas the 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.

ch	the character to be converted.
return	the lowercase equivalent of the character, if any; otherwise, the character itself.
See also	isLowerCase(char), toLowerCase()

Converts the character (Unicode code point) argument to lowercase using case mapping information from the UnicodeData file.

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

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

codePoint	the character (Unicode code point) to be converted.
return	the lowercase equivalent of the character (Unicode code point), if any; otherwise, the character itself.
since	1.5
See also	isLowerCase(int), toLowerCase()

Returns a String object representing this Character's value. The result is a string of length 1 whose sole component is the primitive char value represented by this Character object.

return

a string representation of this object.

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

c	the char to be converted
return	the string representation of the specified char
since	1.4

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 char argument is already a titlecase char, the same char value will be returned.

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

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

ch	the character to be converted.
return	the titlecase equivalent of the character, if any; otherwise, the character itself.
since	1.0.2
See also	isTitleCase(char), toLowerCase(char), toUpperCase(char)

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 Character.isTitleCase(Character.toTitleCase(codePoint)) does not always return true for some ranges of characters.

codePoint	the character (Unicode code point) to be converted.
return	the titlecase equivalent of the character, if any; otherwise, the character itself.
since	1.5
See also	isTitleCase(int), toLowerCase(int), toUpperCase(int)

Converts the character argument to uppercase using case mapping information from the UnicodeData file.

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

In general, java.lang.String#toUpperCase() should be used to map characters to uppercase. String case mapping methods have several benefits over Character case mapping methods. String case mapping methods can perform locale-sensitive mappings, context-sensitive mappings, and 1:M character mappings, whereas the 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.

ch	the character to be converted.
return	the uppercase equivalent of the character, if any; otherwise, the character itself.
See also	isUpperCase(char), toUpperCase()

Converts the character (Unicode code point) argument to uppercase using case mapping information from the UnicodeData file.

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

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

codePoint	the character (Unicode code point) to be converted.
return	the uppercase equivalent of the character, if any; otherwise, the character itself.
since	1.5
See also	isUpperCase(int), toUpperCase()

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.

c	a char value.
return	a Character instance representing c.
since	1.5

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.

ch	the character to be tested
return	true if the character has a defined meaning in Unicode; false otherwise.
since	1.0.2
See also	isDigit(char), isLetter(char), isLetterOrDigit(char), isLowerCase(char), isTitleCase(char), isUpperCase(char)

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.

codePoint	the character (Unicode code point) to be tested.
return	true if the character has a defined meaning in Unicode; false otherwise.
since	1.5
See also	isDigit(int), isLetter(int), isLetterOrDigit(int), isLowerCase(int), isTitleCase(int), isUpperCase(int)

Determines if the specified character is a digit.

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

Some Unicode character ranges that contain digits:

• '\u0030' through '\u0039', ISO-LATIN-1 digits ('0' through '9')
• '\u0660' through '\u0669', Arabic-Indic digits
• '\u06F0' through '\u06F9', Extended Arabic-Indic digits
• '\u0966' through '\u096F', Devanagari digits
• '\uFF10' through '\uFF19', Fullwidth digits

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.

ch	the character to be tested.
return	true if the character is a digit; false otherwise.
See also	digit(char, int), forDigit(int, int), getType(char)

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 DECIMAL_DIGIT_NUMBER.

Some Unicode character ranges that contain digits:

• '\u0030' through '\u0039', ISO-LATIN-1 digits ('0' through '9')
• '\u0660' through '\u0669', Arabic-Indic digits
• '\u06F0' through '\u06F9', Extended Arabic-Indic digits
• '\u0966' through '\u096F', Devanagari digits
• '\uFF10' through '\uFF19', Fullwidth digits

Many other character ranges contain digits as well.

codePoint	the character (Unicode code point) to be tested.
return	true if the character is a digit; false otherwise.
since	1.5
See also	forDigit(int, int), getType(int)

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 char values is DIRECTIONALITY_UNDEFINED.

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

ch	char for which the directionality property is requested.
return	the directionality property of the char value.
since	1.4
See also	DIRECTIONALITY_UNDEFINED, DIRECTIONALITY_LEFT_TO_RIGHT, DIRECTIONALITY_RIGHT_TO_LEFT, DIRECTIONALITY_RIGHT_TO_LEFT_ARABIC, DIRECTIONALITY_EUROPEAN_NUMBER, DIRECTIONALITY_EUROPEAN_NUMBER_SEPARATOR, DIRECTIONALITY_EUROPEAN_NUMBER_TERMINATOR, DIRECTIONALITY_ARABIC_NUMBER, DIRECTIONALITY_COMMON_NUMBER_SEPARATOR, DIRECTIONALITY_NONSPACING_MARK, DIRECTIONALITY_BOUNDARY_NEUTRAL, DIRECTIONALITY_PARAGRAPH_SEPARATOR, DIRECTIONALITY_SEGMENT_SEPARATOR, DIRECTIONALITY_WHITESPACE, DIRECTIONALITY_OTHER_NEUTRALS, DIRECTIONALITY_LEFT_TO_RIGHT_EMBEDDING, DIRECTIONALITY_LEFT_TO_RIGHT_OVERRIDE, DIRECTIONALITY_RIGHT_TO_LEFT_EMBEDDING, DIRECTIONALITY_RIGHT_TO_LEFT_OVERRIDE, DIRECTIONALITY_POP_DIRECTIONAL_FORMAT

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.

codePoint	the character (Unicode code point) for which the directionality property is requested.
return	the directionality property of the character.
since	1.5
See also	DIRECTIONALITY_UNDEFINED, DIRECTIONALITY_LEFT_TO_RIGHT, DIRECTIONALITY_RIGHT_TO_LEFT, DIRECTIONALITY_RIGHT_TO_LEFT_ARABIC, DIRECTIONALITY_EUROPEAN_NUMBER, DIRECTIONALITY_EUROPEAN_NUMBER_SEPARATOR, DIRECTIONALITY_EUROPEAN_NUMBER_TERMINATOR, DIRECTIONALITY_ARABIC_NUMBER, DIRECTIONALITY_COMMON_NUMBER_SEPARATOR, DIRECTIONALITY_NONSPACING_MARK, DIRECTIONALITY_BOUNDARY_NEUTRAL, DIRECTIONALITY_PARAGRAPH_SEPARATOR, DIRECTIONALITY_SEGMENT_SEPARATOR, DIRECTIONALITY_WHITESPACE, DIRECTIONALITY_OTHER_NEUTRALS, DIRECTIONALITY_LEFT_TO_RIGHT_EMBEDDING, DIRECTIONALITY_LEFT_TO_RIGHT_OVERRIDE, DIRECTIONALITY_RIGHT_TO_LEFT_EMBEDDING, DIRECTIONALITY_RIGHT_TO_LEFT_OVERRIDE, DIRECTIONALITY_POP_DIRECTIONAL_FORMAT

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

This method returns true if and only if

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

is true.

ch	the char value to be tested.
return	true if the char value is between '\uD800' and '\uDBFF' inclusive; false otherwise.
since	1.5
See also	isLowSurrogate(char), of(int)

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
  • '\u0000' through '\u0008'
  • '\u000E' through '\u001B'
  • '\u007F' through '\u009F'
• all characters that have the FORMAT general category value

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

ch	the character to be tested.
return	true if the character is an ignorable control character that may be part of a Java or Unicode identifier; false otherwise.
since	1.1
See also	isJavaIdentifierPart(char), isUnicodeIdentifierPart(char)

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
  • '\u0000' through '\u0008'
  • '\u000E' through '\u001B'
  • '\u007F' through '\u009F'
• all characters that have the FORMAT general category value

codePoint	the character (Unicode code point) to be tested.
return	true if the character is an ignorable control character that may be part of a Java or Unicode identifier; false otherwise.
since	1.5
See also	isJavaIdentifierPart(int), isUnicodeIdentifierPart(int)

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 '\u0000' through '\u001F' or in the range '\u007F' through '\u009F'.

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

ch	the character to be tested.
return	true if the character is an ISO control character; false otherwise.
since	1.1
See also	isSpaceChar(char), isWhitespace(char)

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 '\u0000' through '\u001F' or in the range '\u007F' through '\u009F'.

codePoint	the character (Unicode code point) to be tested.
return	true if the character is an ISO control character; false otherwise.
since	1.5
See also	isSpaceChar(int), isWhitespace(int)

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 '$')
• it is a connecting punctuation character (such as '_')
• 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 returns true for the character

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

ch	the character to be tested.
return	true if the character may be part of a Java identifier; false otherwise.
since	1.1
See also	isIdentifierIgnorable(char), isJavaIdentifierStart(char), isLetterOrDigit(char), isUnicodeIdentifierPart(char), isIdentifier(CharSequence)

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 '$')
• it is a connecting punctuation character (such as '_')
• 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 true for the character

codePoint	the character (Unicode code point) to be tested.
return	true if the character may be part of a Java identifier; false otherwise.
since	1.5
See also	isIdentifierIgnorable(int), isJavaIdentifierStart(int), isLetterOrDigit(int), isUnicodeIdentifierPart(int), isIdentifier(CharSequence)

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 true
• getType(ch) returns LETTER_NUMBER
• ch is a currency symbol (such as "$")
• ch is a connecting punctuation character (such as "_").

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

ch	the character to be tested.
return	true if the character may start a Java identifier; false otherwise.
since	1.1
See also	isJavaIdentifierPart(char), isLetter(char), isUnicodeIdentifierStart(char), isIdentifier(CharSequence)

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 true
• getType(codePoint) returns LETTER_NUMBER
• the referenced character is a currency symbol (such as "$")
• the referenced character is a connecting punctuation character (such as "_").

codePoint	the character (Unicode code point) to be tested.
return	true if the character may start a Java identifier; false otherwise.
since	1.5
See also	isJavaIdentifierPart(int), isLetter(int), isUnicodeIdentifierStart(int), isIdentifier(CharSequence)

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 true
• getType(ch) returns LETTER_NUMBER
• ch is a currency symbol (such as "$")
• ch is a connecting punctuation character (such as "_").

ch	the character to be tested.
return	true if the character may start a Java identifier; false otherwise.
since	1.02
deprecated	Replaced by isJavaIdentifierStart(char).
See also	isJavaLetterOrDigit(char), isJavaIdentifierStart(char), isJavaIdentifierPart(char), isLetter(char), isLetterOrDigit(char), isUnicodeIdentifierStart(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 '$')
• it is a connecting punctuation character (such as '_')
• 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 returns true for the character.

ch	the character to be tested.
return	true if the character may be part of a Java identifier; false otherwise.
since	1.02
deprecated	Replaced by isJavaIdentifierPart(char).
See also	isJavaLetter(char), isJavaIdentifierStart(char), isJavaIdentifierPart(char), isLetter(char), isLetterOrDigit(char), isUnicodeIdentifierPart(char), isIdentifierIgnorable(char)

Determines if the specified character is a letter.

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

• UPPERCASE_LETTER
• LOWERCASE_LETTER
• TITLECASE_LETTER
• MODIFIER_LETTER
• OTHER_LETTER

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.

ch	the character to be tested.
return	true if the character is a letter; false otherwise.
See also	isDigit(char), isJavaIdentifierStart(char), isJavaLetter(char), isJavaLetterOrDigit(char), isLetterOrDigit(char), isLowerCase(char), isTitleCase(char), isUnicodeIdentifierStart(char), isUpperCase(char)

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:

• UPPERCASE_LETTER
• LOWERCASE_LETTER
• TITLECASE_LETTER
• MODIFIER_LETTER
• OTHER_LETTER

Not all letters have case. Many characters are letters but are neither uppercase nor lowercase nor titlecase.

codePoint	the character (Unicode code point) to be tested.
return	true if the character is a letter; false otherwise.
since	1.5
See also	isDigit(int), isJavaIdentifierStart(int), isLetterOrDigit(int), isLowerCase(int), isTitleCase(int), isUnicodeIdentifierStart(int), isUpperCase(int)

Determines if the specified character is a letter or digit.

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

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

ch	the character to be tested.
return	true if the character is a letter or digit; false otherwise.
since	1.0.2
See also	isDigit(char), isJavaIdentifierPart(char), isJavaLetter(char), isJavaLetterOrDigit(char), isLetter(char), isUnicodeIdentifierPart(char)

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 true for the character.

codePoint	the character (Unicode code point) to be tested.
return	true if the character is a letter or digit; false otherwise.
since	1.5
See also	isDigit(int), isJavaIdentifierPart(int), isLetter(int), isUnicodeIdentifierPart(int)

Determines if the specified character is a lowercase character.

A character is lowercase if its general category type, provided by Character.getType(ch), is LOWERCASE_LETTER.

The following are examples of lowercase characters:

 a b c d e f g h i j k l m n o p q r s t u v w x y z
 '\u00DF' '\u00E0' '\u00E1' '\u00E2' '\u00E3' '\u00E4' '\u00E5' '\u00E6' 
 '\u00E7' '\u00E8' '\u00E9' '\u00EA' '\u00EB' '\u00EC' '\u00ED' '\u00EE'
 '\u00EF' '\u00F0' '\u00F1' '\u00F2' '\u00F3' '\u00F4' '\u00F5' '\u00F6'
 '\u00F8' '\u00F9' '\u00FA' '\u00FB' '\u00FC' '\u00FD' '\u00FE' '\u00FF'
 

Many other Unicode characters are lowercase too.

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

ch	the character to be tested.
return	true if the character is lowercase; false otherwise.
See also	isLowerCase(char), isTitleCase(char), toLowerCase(char), getType(char)

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 LOWERCASE_LETTER.

The following are examples of lowercase characters:

 a b c d e f g h i j k l m n o p q r s t u v w x y z
 '\u00DF' '\u00E0' '\u00E1' '\u00E2' '\u00E3' '\u00E4' '\u00E5' '\u00E6' 
 '\u00E7' '\u00E8' '\u00E9' '\u00EA' '\u00EB' '\u00EC' '\u00ED' '\u00EE'
 '\u00EF' '\u00F0' '\u00F1' '\u00F2' '\u00F3' '\u00F4' '\u00F5' '\u00F6'
 '\u00F8' '\u00F9' '\u00FA' '\u00FB' '\u00FC' '\u00FD' '\u00FE' '\u00FF'
 

Many other Unicode characters are lowercase too.

codePoint	the character (Unicode code point) to be tested.
return	true if the character is lowercase; false otherwise.
since	1.5
See also	isLowerCase(int), isTitleCase(int), toLowerCase(int), getType(int)

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

This method returns true if and only if

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

is true.

ch	the char value to be tested.
return	true if the char value is between '\uDC00' and '\uDFFF' inclusive; false otherwise.
since	1.5
See also	isHighSurrogate(char)

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, '\u0028' LEFT PARENTHESIS is semantically defined to be an opening parenthesis. This will appear as a "(" in text that is left-to-right but as a ")" in text that is right-to-left.

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

ch	char for which the mirrored property is requested
return	true if the char is mirrored, false if the char is not mirrored or is not defined.
since	1.4

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, '\u0028' LEFT PARENTHESIS is semantically defined to be an opening parenthesis. This will appear as a "(" in text that is left-to-right but as a ")" in text that is right-to-left.

codePoint	the character (Unicode code point) to be tested.
return	true if the character is mirrored, false if the character is not mirrored or is not defined.
since	1.5

Returns the int value that the specified Unicode character represents. For example, the character '\u216C' (the roman numeral fifty) will return an int with a value of 50.

The letters A-Z in their uppercase ('\u0041' through '\u005A'), lowercase ('\u0061' through '\u007A'), and full width variant ('\uFF21' through '\uFF3A' and '\uFF41' through '\uFF5A') forms have numeric values from 10 through 35. This is independent of the Unicode specification, which does not assign numeric values to these char values.

If the character does not have a numeric value, then -1 is returned. If the character has a numeric value that cannot be represented as a nonnegative integer (for example, a fractional value), then -2 is returned.

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

ch	the character to be converted.
return	the numeric value of the character, as a nonnegative int value; -2 if the character has a numeric value that is not a nonnegative integer; -1 if the character has no numeric value.
since	1.1
See also	forDigit(int, int), isDigit(char)

Returns the int value that the specified character (Unicode code point) represents. For example, the character '\u216C' (the Roman numeral fifty) will return an int with a value of 50.

The letters A-Z in their uppercase ('\u0041' through '\u005A'), lowercase ('\u0061' through '\u007A'), and full width variant ('\uFF21' through '\uFF3A' and '\uFF41' through '\uFF5A') forms have numeric values from 10 through 35. This is independent of the Unicode specification, which does not assign numeric values to these char values.

If the character does not have a numeric value, then -1 is returned. If the character has a numeric value that cannot be represented as a nonnegative integer (for example, a fractional value), then -2 is returned.

codePoint	the character (Unicode code point) to be converted.
return	the numeric value of the character, as a nonnegative int value; -2 if the character has a numeric value that is not a nonnegative integer; -1 if the character has no numeric value.
since	1.5
See also	forDigit(int, int), isDigit(int)

Determines if the specified character is ISO-LATIN-1 white space. This method returns true for the following five characters only:

'\t'	'\u0009'	HORIZONTAL TABULATION
'\n'	'\u000A'	NEW LINE
'\f'	'\u000C'	FORM FEED
'\r'	'\u000D'	CARRIAGE RETURN
' '	'\u0020'	SPACE

ch	the character to be tested.
return	true if the character is ISO-LATIN-1 white space; false otherwise.
deprecated	Replaced by isWhitespace(char).
See also	isSpaceChar(char), isWhitespace(char)

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:

• SPACE_SEPARATOR
• LINE_SEPARATOR
• PARAGRAPH_SEPARATOR

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

ch	the character to be tested.
return	true if the character is a space character; false otherwise.
since	1.1
See also	isWhitespace(char)

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:

• #SPACE_SEPARATOR
• #LINE_SEPARATOR
• #PARAGRAPH_SEPARATOR

codePoint	the character (Unicode code point) to be tested.
return	true if the character is a space character; false otherwise.
since	1.5
See also	isWhitespace(int)

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

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

codePoint	the character (Unicode code point) to be tested
return	true if the specified character is in the Unicode supplementary character range; false otherwise.
since	1.5

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

 isHighSurrogate(high) && isLowSurrogate(low)
 

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

Determines if the specified character is a titlecase character.

A character is a titlecase character if its general category type, provided by Character.getType(ch), is TITLECASE_LETTER.

Some characters look like pairs of Latin letters. For example, there is an uppercase letter that looks like "LJ" and has a corresponding lowercase letter that looks like "lj". A third form, which looks like "Lj", is the appropriate form to use when rendering a word in lowercase with initial capitals, as for a book title.

These are some of the Unicode characters for which this method returns true:

• LATIN CAPITAL LETTER D WITH SMALL LETTER Z WITH CARON
• LATIN CAPITAL LETTER L WITH SMALL LETTER J
• LATIN CAPITAL LETTER N WITH SMALL LETTER J
• LATIN CAPITAL LETTER D WITH SMALL LETTER Z

Many other Unicode characters are titlecase too.

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

ch	the character to be tested.
return	true if the character is titlecase; false otherwise.
since	1.0.2
See also	isLowerCase(char), isUpperCase(char), toTitleCase(char), getType(char)

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 TITLECASE_LETTER.

Some characters look like pairs of Latin letters. For example, there is an uppercase letter that looks like "LJ" and has a corresponding lowercase letter that looks like "lj". A third form, which looks like "Lj", is the appropriate form to use when rendering a word in lowercase with initial capitals, as for a book title.

These are some of the Unicode characters for which this method returns true:

• LATIN CAPITAL LETTER D WITH SMALL LETTER Z WITH CARON
• LATIN CAPITAL LETTER L WITH SMALL LETTER J
• LATIN CAPITAL LETTER N WITH SMALL LETTER J
• LATIN CAPITAL LETTER D WITH SMALL LETTER Z

Many other Unicode characters are titlecase too.

codePoint	the character (Unicode code point) to be tested.
return	true if the character is titlecase; false otherwise.
since	1.5
See also	isLowerCase(int), isUpperCase(int), toTitleCase(int), getType(int)

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.

ch	the character to be tested.
return	a value of type int representing the character's general category.
since	1.1
See also	COMBINING_SPACING_MARK, CONNECTOR_PUNCTUATION, CONTROL, CURRENCY_SYMBOL, DASH_PUNCTUATION, DECIMAL_DIGIT_NUMBER, ENCLOSING_MARK, END_PUNCTUATION, FINAL_QUOTE_PUNCTUATION, FORMAT, INITIAL_QUOTE_PUNCTUATION, LETTER_NUMBER, LINE_SEPARATOR, LOWERCASE_LETTER, MATH_SYMBOL, MODIFIER_LETTER, MODIFIER_SYMBOL, NON_SPACING_MARK, OTHER_LETTER, OTHER_NUMBER, OTHER_PUNCTUATION, OTHER_SYMBOL, PARAGRAPH_SEPARATOR, PRIVATE_USE, SPACE_SEPARATOR, START_PUNCTUATION, SURROGATE, TITLECASE_LETTER, UNASSIGNED, UPPERCASE_LETTER

Returns a value indicating a character's general category.

codePoint	the character (Unicode code point) to be tested.
return	a value of type int representing the character's general category.
since	1.5
See also	COMBINING_SPACING_MARK, CONNECTOR_PUNCTUATION, CONTROL, CURRENCY_SYMBOL, DASH_PUNCTUATION, DECIMAL_DIGIT_NUMBER, ENCLOSING_MARK, END_PUNCTUATION, FINAL_QUOTE_PUNCTUATION, FORMAT, INITIAL_QUOTE_PUNCTUATION, LETTER_NUMBER, LINE_SEPARATOR, LOWERCASE_LETTER, MATH_SYMBOL, MODIFIER_LETTER, MODIFIER_SYMBOL, NON_SPACING_MARK, OTHER_LETTER, OTHER_NUMBER, OTHER_PUNCTUATION, OTHER_SYMBOL, PARAGRAPH_SEPARATOR, PRIVATE_USE, SPACE_SEPARATOR, START_PUNCTUATION, SURROGATE, TITLECASE_LETTER, UNASSIGNED, UPPERCASE_LETTER

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 '_')
• 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 returns true for this character.

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

ch	the character to be tested.
return	true if the character may be part of a Unicode identifier; false otherwise.
since	1.1
See also	isIdentifierIgnorable(char), isJavaIdentifierPart(char), isLetterOrDigit(char), isUnicodeIdentifierStart(char)

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 '_')
• 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 returns true for this character.

codePoint	the character (Unicode code point) to be tested.
return	true if the character may be part of a Unicode identifier; false otherwise.
since	1.5
See also	isIdentifierIgnorable(int), isJavaIdentifierPart(int), isLetterOrDigit(int), isUnicodeIdentifierStart(int)

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:

• isLetter(ch) returns true
• getType(ch) returns LETTER_NUMBER.

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

ch	the character to be tested.
return	true if the character may start a Unicode identifier; false otherwise.
since	1.1
See also	isJavaIdentifierStart(char), isLetter(char), isUnicodeIdentifierPart(char)

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:

• isLetter(codePoint) returns true
• getType(codePoint) returns LETTER_NUMBER.

codePoint	the character (Unicode code point) to be tested.
return	true if the character may start a Unicode identifier; false otherwise.
since	1.5
See also	isJavaIdentifierStart(int), isLetter(int), isUnicodeIdentifierPart(int)

Determines if the specified character is an uppercase character.

A character is uppercase if its general category type, provided by Character.getType(ch), is UPPERCASE_LETTER.

The following are examples of uppercase characters:

 A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
 '\u00C0' '\u00C1' '\u00C2' '\u00C3' '\u00C4' '\u00C5' '\u00C6' '\u00C7'
 '\u00C8' '\u00C9' '\u00CA' '\u00CB' '\u00CC' '\u00CD' '\u00CE' '\u00CF'
 '\u00D0' '\u00D1' '\u00D2' '\u00D3' '\u00D4' '\u00D5' '\u00D6' '\u00D8'
 '\u00D9' '\u00DA' '\u00DB' '\u00DC' '\u00DD' '\u00DE'
 

Many other Unicode characters are uppercase too.

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

ch	the character to be tested.
return	true if the character is uppercase; false otherwise.
since	1.0
See also	isLowerCase(char), isTitleCase(char), toUpperCase(char), getType(char)

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 UPPERCASE_LETTER.

The following are examples of uppercase characters:

 A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
 '\u00C0' '\u00C1' '\u00C2' '\u00C3' '\u00C4' '\u00C5' '\u00C6' '\u00C7'
 '\u00C8' '\u00C9' '\u00CA' '\u00CB' '\u00CC' '\u00CD' '\u00CE' '\u00CF'
 '\u00D0' '\u00D1' '\u00D2' '\u00D3' '\u00D4' '\u00D5' '\u00D6' '\u00D8'
 '\u00D9' '\u00DA' '\u00DB' '\u00DC' '\u00DD' '\u00DE'
 

Many other Unicode characters are uppercase too.

codePoint	the character (Unicode code point) to be tested.
return	true if the character is uppercase; false otherwise.
since	1.5
See also	isLowerCase(int), isTitleCase(int), toUpperCase(int), getType(int)

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

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

codePoint	the Unicode code point to be tested
return	true if the specified code point value is a valid code point value; false otherwise.
since	1.5

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 (SPACE_SEPARATOR, LINE_SEPARATOR, or PARAGRAPH_SEPARATOR) but is not also a non-breaking space ('\u00A0', '\u2007', '\u202F').
• It is '\u0009', HORIZONTAL TABULATION.
• It is '\u000A', LINE FEED.
• It is '\u000B', VERTICAL TABULATION.
• It is '\u000C', FORM FEED.
• It is '\u000D', CARRIAGE RETURN.
• It is '\u001C', FILE SEPARATOR.
• It is '\u001D', GROUP SEPARATOR.
• It is '\u001E', RECORD SEPARATOR.
• It is '\u001F', UNIT SEPARATOR.

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

ch	the character to be tested.
return	true if the character is a Java whitespace character; false otherwise.
since	1.1
See also	isSpaceChar(char)

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 ('\u00A0', '\u2007', '\u202F').
• It is '\u0009', HORIZONTAL TABULATION.
• It is '\u000A', LINE FEED.
• It is '\u000B', VERTICAL TABULATION.
• It is '\u000C', FORM FEED.
• It is '\u000D', CARRIAGE RETURN.
• It is '\u001C', FILE SEPARATOR.
• It is '\u001D', GROUP SEPARATOR.
• It is '\u001E', RECORD SEPARATOR.
• It is '\u001F', UNIT SEPARATOR.

codePoint	the character (Unicode code point) to be tested.
return	true if the character is a Java whitespace character; false otherwise.
since	1.5
See also	isSpaceChar(int)