code: public OkCoinDepth getFuturesDepth(CurrencyPair currencyPair, FuturesContract prompt)
        throws IOException {
      return okCoin.getFuturesDepth(
          "1", OkCoinAdapters.adaptSymbol(currencyPair), prompt.getName().toLowerCase());
    }
docs: 获取OKEx合约深度信息
  
  @param currencyPair
  @param prompt
  @return
  @throws IOException