Dúvida JDBC - SQL Server 2000

import java.io.IOException;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;

public class JDBCExemplo {

	public static void main(String args[]) throws IOException, SQLException, Exception{
		
		StringBuffer sb = new StringBuffer();
		sb.append("jdbc:microsoft:sqlserver://localhost;");
		sb.append("DatabaseName=MARCO,sqlacessa,123456");
				
		try {
			
			Class.forName("com.microsoft.jdbc.sqlserver.SQLServerDriver");
			Connection conn = DriverManager.getConnection(sb.toString());
			System.out.println(sb);
			System.out.println("Conectado!!!");
		} catch(Exception e) {
			e.printStackTrace();
		}
		
	}
}

package com.teste;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.Statement;

public class conexao {
    String SQL = " select city from authors " ; /* Coloque aqui sua consulta */
    String Campo = "city"; /* Coloque o campo de retorno de sua consulta SQL */
    String SeuDsn = "pubs"; /* Aqui vc irá colocar o dsn configurado da sua máquina */
    String dsn = "jdbc:odbc:" + SeuDsn; /* String para o dsn */
    String user  = "sqlacessa"; /* Usuário */
    String password  = "123456"; /* Senha */
    String conn = "sun.jdbc.odbc.JdbcOdbcDriver"; /* String de conexao com o driver */

public conexao(){
try{
   
    Class.forName(conn);

    Connection c = DriverManager.getConnection(dsn,user,password);

    Statement st = c.createStatement();

    ResultSet rs = st.executeQuery(SQL);

    // se nao for final de registro
    if ( rs != null ){
        while( rs.next() ){
            System.out.println("Campo : " + rs.getString(Campo));
        }
    }
} catch (Exception e){
      System.out.println(e);
}

}

public static void main(String[] args) {
conexao conexao1 = new conexao();
}
}