java链接oracle数据库

import java.sql.*;

public class DBConnection {
public Connection getConnection()
{ 
     Connection conn=null;
    
    String CLASSFORNAME = "oracle.jdbc.driver.OracleDriver";
    String SERVANDDB = "jdbc:oracle:thin:@localhost:1521:orcl";
    //oracle
    String USER="scott";
 String PWD="orcl";
try
{
  Class.forName(CLASSFORNAME);
      conn=DriverManager.getConnection(SERVANDDB,USER,PWD);   
}catch(Exception ex)
{
ex.printStackTrace();
}
 return conn;
}   


 public static void main(String[] args)
  {
  
    ResultSet rs=null;
    DBConnection db=new DBConnection();