private static String readLine ( ) {
  buffer = null ;
  try {
    return br . readLine ( ) ;
  }
  catch ( IOException e ) {
    throw new RuntimeException ( e ) ;
  }
}

private static String readLine ( ) { buffer = null ; try { return br . readLine ( ) ; } catch ( IOException e ) { throw new RuntimeException ( e ) ; } }
(method_declaration (modifiers) type: (type_identifier) name: (identifier) parameters: (formal_parameters) body: (block (expression_statement (assignment_expression left: (identifier) right: (null_literal))) (try_statement body: (block (return_statement (method_invocation object: (identifier) name: (identifier) arguments: (argument_list)))) (catch_clause (catch_formal_parameter (catch_type (type_identifier)) name: (identifier)) body: (block (throw_statement (object_creation_expression type: (type_identifier) arguments: (argument_list (identifier)))))))))