我正在写一个小程序来帮助计划未来的锻炼。我几乎完成，但保存和加载是给我一些麻烦。这个程序使用一系列的“ride”（一个自定义类）对象，这些对象具有许多特性（比如dat，然后是一些int和double）
现在，我有两种方法，“saver”和“loader”：

public void saver() {
        try{  // Catch errors in I/O if necessary.
            // Open a file to write to, named SavedObj.sav.
            FileOutputStream saveFile=new FileOutputStream("SaveObj.sav"); 
            // Create an ObjectOutputStream to put objects into save file.
            ObjectOutputStream save = new ObjectOutputStream(saveFile);               
            // Now we do the save.
            for (int x = 0; x < rides.size(); x++) {
                save.writeObject(rides.get(x).getDate());
                save.writeObject(rides.get(x).getMinutes());
                save.writeObject(0);
                save.writeObject(rides.get(x).getIF());
                save.writeObject(rides.get(x).getTss());
            }

            // Close the file.
            save.close(); // This also closes saveFile.
        }
        catch(Exception exc){
            exc.printStackTrace(); // If there was an error, print the info.
        }

    }

    public void loader() {
        try{
            // Open file to read from, named SavedObj.sav.
            FileInputStream saveFile = new FileInputStream("SaveObj.sav");

            // Create an ObjectInputStream to get objects from save file.
            ObjectInputStream save = new ObjectInputStream(saveFile);
            Ride worker;
            while(save.available() > 0) {
                worker = new Ride((Date)save.readObject(), (int)save.readObject(), (double)save.readObject(), (double)save.readObject(), (int)save.readObject());
                addRide(worker.getDate(), worker.getMinutes(), 0, worker.getIF(), worker.getTss());
            }

            // Close the file.
            save.close(); // This also closes saveFile.
            }
            catch(Exception exc){
                exc.printStackTrace(); // If there was an error, print the info.
        }
    }

当我运行程序时，“save”和“load”都不会返回任何错误。当一个.sav文件不存在时，就会创建一个.sav文件，并在每次执行程序时进行编辑。然而，该程序从不恢复以前会话中的数据。如果需要更多信息，请告诉我。提前感谢您的帮助！