我想将我的ArrayList保存到文本文件中。但是如何保存的格式是错误的。我的代码:从ArrayList写入每个ArrayList对象具有多个值的文本文件(java)
ArrayList<Vehicle> vehs = new ArrayList<Vehicle>();
vehs.add(new Vehicle("QJT123", "Starlet 99", 35.0, 190000));
vehs.add(new PremiumVehicle("TUX132", "BWM 05 ", 90.0, 12000, 100, 10000, 5000));
构造用于这些2:
public PremiumVehicle(String vehicleID, String description, double dailyRate, int odometer, int allowance, int serLength, int lastOdo) //subclass
public Vehicle(String vehicleID, String description, double dailyRate, int odometer) //Superclass
这两种存储到车辆的ArrayList。代码保存到文本文件:
private static void saveFile(ArrayList<Vehicle> vehs){
File fileName = new File("VehicleList.txt");
try {
FileWriter fw = new FileWriter(fileName);
Writer output = new BufferedWriter(fw);
for (int i = 0; i < vehs.size(); i++){
output.write(vehs.get(i).toString() + "\n");
}
output.close();
} catch (Exception e) {
JOptionPane.showMessageDialog(null, "I cannot create that file");
}
}
我在VehicleList.txt输出:
vehicle ID = QJT123 Description = Starlet 99 Status = A Daily Rate = 35.0 Odometer reading = 190000vehicle ID = TUX132 Description = BWM 05 Status = A Daily Rate = 90.0 Odometer reading = 12000 Mileage allowance = 100 service length = 10000 Last Service = 5000
我怎么让这样一个新的ArrayList对象,如书写时每一新行补充说:
vehicle ID = QJT123 Description = Starlet 99 Status = A Daily Rate = 35.0 Odometer reading = 190000
vehicle ID = TUX132 Description = BWM 05 Status = A Daily Rate = 90.0 Odometer reading = 12000 Mileage allowance = 100 service length = 10000 Last Service = 5000
我试过使用vehs.get(i).toString() + "\n"
但它似乎没有工作。
不清楚我,你的2个对象正在写在同一行? –
@ΦXocę웃Пepeúpaツ是的,在我的文本文件中,它全部写在一行中。假设在车辆ID –
没有任何意义之前添加新线路。用一些代码测试,它工作得很好 – XtremeBaumer