public static char n ( char c ) {
  return c == 'a' ? 'z' : ( char ) ( c - 1 ) ;
}

public static char n ( char c ) { return c == ' a ' ? ' z ' : ( char ) ( c - 1 ) ; }
(method_declaration (modifiers) type: (integral_type) name: (identifier) parameters: (formal_parameters (formal_parameter type: (integral_type) name: (identifier))) body: (block (return_statement (ternary_expression condition: (binary_expression left: (identifier) right: (character_literal)) consequence: (character_literal) alternative: (cast_expression type: (integral_type) value: (parenthesized_expression (binary_expression left: (identifier) right: (decimal_integer_literal))))))))