yell_subma的专栏

 Opening the database // accessDb4oObjectContainer db=Db4o.openFile(Util.DB4OFILENAME);try {    // do something with db4o}finally {    db.close();} St

Pilot { string name;   int point;   } Car  { string model;  Pilot pilot; }// storeFirstCarCar car1=new Car("Ferrari");Pilot pilot1=new Pilot("Michael Schumacher",100);car1.setPilot(pilot1);//保存C