CODEWITHSUNDEEP
javafileloadstore
brain_damage
brain_damage

Reputation: 985

Load/Store Objects in file in Java

I want to store an object from my class in file, and after that to be able to load the object from this file. But somewhere I am making a mistake(s) and cannot figure out where. May I receive some help?

public class GameManagerSystem implements GameManager, Serializable {

    private static final long serialVersionUID = -5966618586666474164L;
    HashMap<Game, GameStatus> games;
    HashMap<Ticket, ArrayList<Object>> baggage;
    HashSet<Ticket> bookedTickets;
    Place place;


    public GameManagerSystem(Place place) {
        super();

        this.games = new HashMap<Game, GameStatus>();
        this.baggage = new HashMap<Ticket, ArrayList<Object>>();
        this.bookedTickets = new HashSet<Ticket>();
        this.place = place;
    }
    public static GameManager createManagerSystem(Game at) {
        return new GameManagerSystem(at);
    }

    public boolean store(File f) {
        try {
            FileOutputStream fos = new FileOutputStream(f);
            ObjectOutputStream oos = new ObjectOutputStream(fos);
            oos.writeObject(games);
            oos.writeObject(bookedTickets);
            oos.writeObject(baggage);
            oos.close();
            fos.close();
        } catch (IOException ex) {
            return false;
        }
        return true;
    }
    public boolean load(File f) {
        try {
            FileInputStream fis = new FileInputStream(f);
            ObjectInputStream ois = new ObjectInputStream(fis);
            this.games = (HashMap<Game,GameStatus>)ois.readObject();
            this.bookedTickets = (HashSet<Ticket>)ois.readObject();
                this.baggage = (HashMap<Ticket,ArrayList<Object>>)ois.readObject();
            ois.close();
            fis.close();
        } catch (IOException e) {
            return false;
        } catch (ClassNotFoundException e) {
            return false;
        }
        return true;
    }
.
.
.
}


public class JUnitDemo {

    GameManager manager;

    @Before
    public void setUp() {
        manager = GameManagerSystem.createManagerSystem(Place.ENG);
    }

    @Test
    public void testStore() {
        Game g = new Game(new Date(), Teams.LIONS, Teams.SHARKS);
        manager.registerGame(g);
        File file = new File("file.ser");
        assertTrue(airport.store(file));
    }
}

Upvotes: 3

Views: 16708

Answers (3)

Shashank T
Shashank T

Reputation: 649

The solution of this problem is that when you are using other objects, let say class A, into a collection like HashMap and want to serialize the HashMap object, then implement the interface Serializable for class A like this:

class A implements Serializable {
}

...
    HashMap<Integer,A> hmap;
...

Otherwise that object will not be serializable.

I hope it will solve this problem now.

Upvotes: 5

Daniel
Daniel

Reputation: 28084

Please remenber that the whole object graph is persisted during serialize. If you have some references to GUI classes for example, you either have to make them serializable, too, or tag them as "transient", so Java won't serialize them.

Upvotes: 0

Cameron
Cameron

Reputation: 248

Try oos.flush() before you close it.

Upvotes: 0

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