static boolean isAnyNotPalindrome ( String s ) {
  Set < Character > unique = new HashSet < Character > ( ) ;
  for ( int i = 0 ;
  i < s . length ( ) ;
  i ++ ) unique . add ( s . charAt ( i ) ) ;
  if ( unique . size ( ) > 1 ) return true ;
  else return false ;
}

static boolean isAnyNotPalindrome ( String s ) { Set < Character > unique = new HashSet < Character > ( ) ; for ( int i = 0 ; i < s . length ( ) ; i ++ ) unique . add ( s . charAt ( i ) ) ; if ( unique . size ( ) > 1 ) return true ; else return false ; }
(method_declaration (modifiers) type: (boolean_type) name: (identifier) parameters: (formal_parameters (formal_parameter type: (type_identifier) name: (identifier))) body: (block (local_variable_declaration type: (generic_type (type_identifier) (type_arguments (type_identifier))) declarator: (variable_declarator name: (identifier) value: (object_creation_expression type: (generic_type (type_identifier) (type_arguments (type_identifier))) arguments: (argument_list)))) (for_statement init: (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (decimal_integer_literal))) condition: (binary_expression left: (identifier) right: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list))) update: (update_expression (identifier)) body: (expression_statement (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (identifier))))))) (if_statement condition: (parenthesized_expression (binary_expression left: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list)) right: (decimal_integer_literal))) consequence: (return_statement (true)) alternative: (return_statement (false)))))