static String nextToken ( ) {
  try {
    while ( st == null || ! st . hasMoreTokens ( ) ) {
      st = new StringTokenizer ( br . readLine ( ) ) ;
    }
  }
  catch ( IOException e ) {
    e . printStackTrace ( ) ;
  }
  return st . nextToken ( ) ;
}

static String nextToken ( ) { try { while ( st == null || ! st . hasMoreTokens ( ) ) { st = new StringTokenizer ( br . readLine ( ) ) ; } } catch ( IOException e ) { e . printStackTrace ( ) ; } return st . nextToken ( ) ; }
(method_declaration (modifiers) type: (type_identifier) name: (identifier) parameters: (formal_parameters) body: (block (try_statement body: (block (while_statement condition: (parenthesized_expression (binary_expression left: (binary_expression left: (identifier) right: (null_literal)) right: (unary_expression operand: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list))))) body: (block (expression_statement (assignment_expression left: (identifier) right: (object_creation_expression type: (type_identifier) arguments: (argument_list (method_invocation object: (identifier) name: (identifier) arguments: (argument_list))))))))) (catch_clause (catch_formal_parameter (catch_type (type_identifier)) name: (identifier)) body: (block (expression_statement (method_invocation object: (identifier) name: (identifier) arguments: (argument_list)))))) (return_statement (method_invocation object: (identifier) name: (identifier) arguments: (argument_list)))))