19. write a java code to implement jdbc connectivity to insert records into tables to demonstrate PreparedStatement.
20. write a java code to implelment jdbc connectivity to insert records into the tables using positional parameter
21. write a java code to implement jdbc connectivity to delete records from table to demonstrate Statement.
22. write a java code to implement jdbc connectivity to update record in the table
23. write a java code to implement jdbc connectivity to demonstrate scrollable resultset.
24. write a java code to implement jdbc connectivity to demonstrate database metadata
25. Write a java code to implement jdbc connectivity to demonstrate ResultSet metadata.
26. write a servlet program to create simple servlet and test it.
27. write a servlet program to add two numbers to demonstrate doPost.
28. write a servlet program to read client request parameter and get response accordingly.
29. implement servlet to generate multiplication table for numbers entered in html page.
30. write a java code to demonstrate scripting tag
  a) declaration tag 
  b) expression tag
  c) scriplet tag