How to save data entered in textfields onto a database?

For example: Name: 'textfield1' Surname: 'textfield2' Age: 'textfield3'

Save those three textfields and make a file where开发者_C百科 it would print it like this: textfield1, textfield2, textfield3

your question is so vague i assume you want to learn a programming language, maybe even Java

start here: http://java.sun.com/docs/books/tutorial/reallybigindex.html

and here: http://www.mindview.net/Books/TIJ/

You did not present enough info to get a good answer but here may be the place to start:

To interact with a database in Java you use JDBC. This tutorial will help you understand how jdbc works.