Edit Table in java program

Edit Table

import java.sql.*;

public class jdbcConn 

{

   public static void main(String[] args) throws Exception

  {

      Class.forName("org.apache.derby.jdbc.ClientDriver");

      Connection con = DriverManager.getConnection

      ("jdbc:derby://localhost:1527/testDb","username","password");

      Statement stmt = con.createStatement();

      String query ="Create table employees  (id Integer    primary key, first_name Char(50),last_name Char(75))";

      stmt.execute(query);

      System.out.println("Employee table created");

      String query1 = "aLTER TABLE employees Add 

      address Char(100) ";

      String query2 = "ALTER TABLE employees Drop 

      Column last_name";

      stmt.execute(query1);

      stmt.execute(query2);

      System.out.println("Address column added to the table 

      & last_name column removed from the table");

      String query3 = "drop table employees";

      stmt.execute(query3);

      System.out.println("Employees table removed");

   }       

}