Oracle Seeker, Oracle探索者

public class ConnectionManager{
   private Connection _instance ;   
   public static Connection getDatabaseInstance(){
     if (_instance == null ){
       try{
         Class.forName("");
         Connection _instance = DriverManager.getConnection();
       }catch(Exception e){
         System.err.println(e.getMessage());  
       }
     }
     return _instance ;
   }
}