How can i combine more than one getString into a textfield

i want to combine

rs.getString("PresentationDay")
rs.getString("PresentationStart")
rs.getString("PresentationEnd")

into one checkbox so these three will enter the database in one column.

this is my current code

 <input type="checkbox" name="availableTime" value="<%=rs.getString("PresentationDay")AND rs.getString("PresentationStart") AND rs.getString("PresentationEnd") %>">

but im getting error. How can i do this? Thank you in advance!