Program in Java

Need to write a program in Java, as it is for studying, there should not be over intricate codes, from which the teacher falls from his chair. Each line must have an explanation.

What is needed from the prog:
- must be able to connect to the DB (any JDBC drivers);
– the user must navigate to the URL, the username, the password for the connection in the application window;
– when opening the application the user should be able to see (at the end of the application):
– database structure (list of tables, filling each of the field types).