عدم إتصال برامج جافا بقاعدة البيانات SQL Server

package javaapplication45;
import java.sql.*;
;import javax.swing.JOptionPane
*;import javax.swing.
}public class Connect 
 ; Connection con

 }() public static Connection connect
}    try 
   }   Class.forName("com.microsoft.sqlserver.jdbc.SQLServerDriver")
  ;    Connection con = DriverManager.getConnection("jdbc:sqlserver://localhost:1433;databaseName=sa;", "sa", "admin")
      ;JOptionPane.showMessageDialog(null, "success")
     ; return con
    } catch (Exception e){
     ; JOptionPane.showMessageDialog(null, e)
  {
    return null;
{
}  public static void main(String[] args) 
   ;() Connect.connect
  {
{

java.lang.classnotfoundexception com.microsoft.sqlserver.jdbc.sqlserverdriver