Something

    //winkel.java    public void read( File file ) {        try{            ObjectInputStream in = new ObjectInputStream(new FileInputStream(file));            System.out.println(file);            while(in != null){                ingelezenCd = (Cd) in.readObject();                 cdWinkel.add(ingelezenCd);            }            in.close();        }        catch(IOException i){            i.printStackTrace();        }        catch(ClassNotFoundException c){            c.printStackTrace();        }    }//end//GUI.java    private void performOpen() {        final JFileChooser fc = new JFileChooser();        int returnVal = fc.showOpenDialog(this);        if (returnVal == JFileChooser.APPROVE_OPTION) {            File file = fc.getSelectedFile();            winkel.read(file);        }           }//