unchecked cast Error

[Brainiac]

Ich speichere zwei Objekte ab. Obere Methode.
In der unteren Lade ich sie wieder. Wie kann ich dort den unchecked Cast Error umgehen?

    public boolean saveSudoku(SudokuField sudokuToSave, Stack<FieldChangedEvent> undo) {
        if (fileChooser.showSaveDialog(modalComponent.getParent()) != JFileChooser.CANCEL_OPTION) {
            File fileName = fileChooser.getSelectedFile();
            if ( fileName == null || fileName.getName().equals("") ) {
                showError("Invalid File Type");
            } else {
                try {
                    if (fileName.toString().indexOf(".sud") == -1)
                       output = new ObjectOutputStream(new FileOutputStream(fileName.toString()+".sud"));
                    else
                       output = new ObjectOutputStream(new FileOutputStream(fileName.toString()));
                        
                    output.writeObject(sudokuToSave);
                    output.writeObject(undo);
                    output.close();
                    return true;
                } catch (IOException ioEx) {
                    showError("Error Writing File");
                }
            }
        }
        return false;
    }

    public SudokuField loadSudoku() {
        if (fileChooser.showOpenDialog(modalComponent.getParent()) != JFileChooser.CANCEL_OPTION) {
            File fileName = fileChooser.getSelectedFile();
            if ( fileName == null || fileName.getName().equals("") || fileName.getName().indexOf(".sud") == -1) {
                showError("Invalid File Type");
            } else {
                try {
                    input = new ObjectInputStream(new FileInputStream(fileName.toString()));
                    SudokuField field = (SudokuField)input.readObject();
                    Stack<FieldChangedEvent> stack = (Stack<FieldChangedEvent>)input.readObject(); //unchecked cast error
                    return field;
                } catch (IOException ioEx) {
                    showError("Error Reading File");
                } catch (ClassNotFoundException cNFEx) {
                    showError("No such File");
                }
            }
        }
        return null;
    }

 

[SlaterB]

meinst du die Compiler-Warning?

@SuppressWarnings("unchecked")
public SudokuField loadSudoku() {
..
}

wenn ich mich recht erinnere/ klaue
http://forum.java.sun.com/thread.jspa?threadID=685989&messageID=4030406

 

[Brainiac]

@SuppressWarnings("unchecked")
public SudokuField loadSudoku() {
..
}

Das funzt, nur hatte ich daran gar nciht gedacht.
Ich ging davon aus, mann könnte den Code umstellen, damit es für den Compiler logisch wird, aber das kann ja auch gar nicht gehen.