How to save columns and rows in a separate dataframe?

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Java

This is a continuation of a previous question How to filter a dataframe?[^] I got the filtering working but I am having trouble saving the filtered content into it's own dataframe.
I have a column height and the value is either t - tall or s - short.

What I have tried:

DataFrame<object> shortAndTall = DataFrame.readCsv(myDataFile);
shortAndTall.select((Predicate<object>) new Predicate<object>() {
@Override
public Boolean apply(List<object> record) {
String height = (String) record.get(2); //this gets the 3rd column which is height
// System.out.println(height);
return Fall_ADL.equals("t");
}})

now I'm trying to figure out how to save all the tall rows and their corresponding columns into it's own dataframe and then I could do the same for the short content.

Thanks so much!