U+F1FF

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U+F1FF is not a valid unicode character.
Encodings
HTML Entity (decimal) 
HTML Entity (hex) 
How to type in Microsoft Windows Alt +F1FF
UTF-8 (hex) 0xEF 0x87 0xBF (ef87bf)
UTF-8 (binary) 11101111:10000111:10111111
UTF-16 (hex) 0xF1FF (f1ff)
UTF-16 (decimal) 61,951
UTF-32 (hex) 0x0000F1FF (f1ff)
UTF-32 (decimal) 61,951
C/C++/Java source code "\uF1FF"
Python source code u"\uF1FF"
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Java Data
string.toUpperCase()
string.toLowerCase()
Character.UnicodeBlock PRIVATE_USE_AREA
Character.charCount() 1
Character.getDirectionality() DIRECTIONALITY_LEFT_TO_RIGHT [0]
Character.getNumericValue() -1
Character.getType() 18
Character.isDefined() Yes
Character.isDigit() No
Character.isIdentifierIgnorable() No
Character.isISOControl() No
Character.isJavaIdentifierPart() No
Character.isJavaIdentifierStart() No
Character.isLetter() No
Character.isLetterOrDigit() No
Character.isLowerCase() No
Character.isMirrored() No
Character.isSpaceChar() No
Character.isSupplementaryCodePoint() No
Character.isTitleCase() No
Character.isUnicodeIdentifierPart() No
Character.isUnicodeIdentifierStart() No
Character.isUpperCase() No
Character.isValidCodePoint() Yes
Character.isWhitespace() No