如何从文件中读取对象？-Java序列化

Question

我必须将对象（播放器）保存到文件列表中，然后当我再次打开程序时，我必须与播放器一起读取该文件并将其添加到列表中。但是我读这个文件有问题吗？我做错了什么？

public static void writeMethod (String sciezkapliku){
    try {
        FileOutputStream fileOut = new FileOutputStream(sciezkapliku);
        ObjectOutputStream out = new ObjectOutputStream(fileOut);
        for(int i = 0 ; i < MyFrame.listOfPlayer.size() ; i++) {
        out.writeObject(MyFrame.listOfPlayer.get(i));
        }
        out.close();
        fileOut.close();
        System.out.printf("Serialized data is saved ");
    } catch (IOException i) {
        i.printStackTrace();
    }

/////////////////////////////

public ArrayList<Player> readMethod (String sciezkapliku){
    MyFrame.listOfPlayer = null;
    try {
        FileInputStream fileIn = new FileInputStream(sciezkapliku);
        ObjectInputStream in = new ObjectInputStream(fileIn);
        MyFrame.listOfPlayer = (ArrayList) in.readObject();

        in.close();
        fileIn.close();
    } catch (IOException i) {
        i.printStackTrace();
    } catch (ClassNotFoundException c) {
        System.out.println("Employee class not found");
        c.printStackTrace();
}
    return (ArrayList<Player>) MyFrame.listOfPlayer;

}

Answer 1

这是您保存List所需的：

public static void writeMethod(String sciezkapliku) {
    try (ObjectOutputStream out = new ObjectOutputStream(new FileOutputStream(sciezkapliku))) {
        out.writeObject(MyFrame.listOfPlayer);
    } catch (IOException i) {
        i.printStackTrace();
    }
}