java连接数据库的基础问题，急！

[jianxuan]

用JAVA连接数据库，刚刚安装过JDBC，然后如下编写：
import java.sql.*;
class TestDataBase
{
public static void main(String[] args)
{
String strDriver= new String("com.microsoft.jdbc.sqlserver.SQLServerDriver");
String strUrl=
new String("jdbc:microsoft:sqlserver://localhost:1433;DatabaseName=s016139");
String strUser= new String("sa");
String strPassword= new String("123");
Class.forName(strDriver);


StringBuffer Sql= new StringBuffer("Select * From Regcompany");
System.out.println("TestDatabase()");
}
}


编译出现如下错误：
C:\Program Files\Xinox Software\JCreator Pro\MyProjects\TestDataBase.java:12: unreported exception java.lang.ClassNotFoundException; must be caught or declared to be thrown

[zhjjava]

给一个ACCESS的，完整的！得捕获异常！
import java.sql.*;

public class JDBCAccess
{
public static void main(String[] args)
{
String driver = "sun.jdbc.odbc.JdbcOdbcDriver";
String fileName="TestDB.mdb";
String url = "jdbc:odbc:DRIVER=Microsoft Access Driver (*.mdb);DBQ="+fileName;
System.out.println(url);
try
{
Class.forName(driver);
Connection conn = DriverManager.getConnection(url, "", "");
Statement stmt=conn.createStatement();
String sql="select * from table1";
ResultSet rs=stmt.executeQuery(sql);
while(rs.next())
{
System.out.println(rs.getString("test1"));
}
}
catch(ClassNotFoundException cnfe) {
System.out.println(cnfe);
//throw new Exception("不能找到Access数据库的驱动程序 ");
}
catch (SQLException sqle)
{
System.out.println(sqle);
//throw new SQLException("不能连接到Access数据库 ");
}
}
}