But you don't have a String array containing those things. You have an Object array. So:
If that data's going into a JTable then you may well have more questions about how to deal with columns of different type,
you should really pause for a while and go through the Oracle tutorial:
How to Use Tables. A lot of beginners, when writing a Swing application, just start writing code, but that really isn't sufficient. If you don't understand the design requirements behind Swing a bit then you're going to flounder when deciding what code to write.