U+EFFF

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U+EFFF is not a valid unicode character.
Encodings
HTML Entity (decimal) 
HTML Entity (hex) 
How to type in Microsoft Windows Alt +EFFF
UTF-8 (hex) 0xEE 0xBF 0xBF (eebfbf)
UTF-8 (binary) 11101110:10111111:10111111
UTF-16 (hex) 0xEFFF (efff)
UTF-16 (decimal) 61,439
UTF-32 (hex) 0x0000EFFF (efff)
UTF-32 (decimal) 61,439
C/C++/Java source code "\uEFFF"
Python source code u"\uEFFF"
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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