Sorry but you question is hard to understand what you want to do.. Do
you meant to say :

I want to create a JFrame and Add add a  JLabel and JTextField. Once I
add them how do I put data into the JTextField from a java variable?

If this is the general question then you can look at the Java examples
in "The Java Developers Almanac 1.4" at http://javaalmanac.com.

Just enter the object type in the search field and search. Example, for
a JTextField it points me to this link:
http://javaalmanac.com/egs/javax.swing.text/tf_TextField.html

which is: e979. Creating a JTextField Component

Also Look at: " The Really Big Index,
A list of all content pages in the The JavaTM Tutorial "
at http://java.sun.com/docs/books/tutorial/reallybigindex.html

see the sample code snippets at http://mindprod.com/jgloss/jframe.html
http://mindprod.com/jgloss/jtextfield.html

for other widgets you may need see
http://mindprod.com/jgloss/swing.html