Character class

■ The Character class lives in java.lang. All its methods are static final.

■ Several useful methods return a boolean: isLetter(char), isDigit(char), and isJavaIdentifierStart(char) (meaning is it a letter, $ , or _ )

■ Also isLetterOrDigit(char), isLowerCase(char), and isSpaceChar(char)

■ These return a char: toLowerCase(char), and toUpperCase(char)