question: private static boolean [ ] createSafeOctets ( String safeChars ) { int maxChar = 'z' ; char [ ] safeCharArray = safeChars . toCharArray ( ) ; for ( char c : safeCharArray ) { maxChar = Math . max ( c , maxChar ) ; } boolean [ ] octets = new boolean [ maxChar + 1 ] ; for ( int c = '0' ; c <= '9' ; c ++ ) { octets [ c ] = true ; } for ( int c = 'A' ; c <= 'Z' ; c ++ ) { octets [ c ] = true ; } for ( int c = 'a' ; c <= 'z' ; c ++ ) { octets [ c ] = true ; } for ( char c : safeCharArray ) { octets [ c ] = true ; } return octets ; }
target:  Creates a boolean[] with entries corresponding to the character values for 0-9, A-Z, a-z and those specified in safeChars set to true. The array is as small as is required to hold the given character information.