Android Question Read/Write Cells by column(column object Missing?)-aPOI Library

While I was using @DonManfred's Wrapped library(aPOI Library), I noticed that there was no object called XSSFColumn or anything like that in the library(Did I miss anything?). And in the example for the library, only rows are used to display Cell Data , How to get the information of each cell based on columns?
aPOI Version : 0.11