code: public static final boolean hasRemaining(ByteBuffer[] buffers) {
      if (buffers == null) {
        return false;
      }
      for (int i = 0; i < buffers.length; i++) {
        if (buffers[i] != null && buffers[i].hasRemaining()) {
          return true;
        }
      }
      return false;
    }
docs: 查看ByteBuffer数组是否还有剩余
  
  @param buffers ByteBuffers
  @return have remaining