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    //winkel.java    public void write(String fileName) {       try{           ObjectOutputStream out = new ObjectOutputStream(new FileOutputStream(fileName));           cd = new Cd("fred", "titel", "label", 3);           out.writeObject(cd);           out.close();       }       catch(IOException i){                  }    }        public void read( String fileName ) {        try{            ObjectInputStream in = new ObjectInputStream(new FileInputStream(fileName));            ingelezenCd = (Cd) in.readObject();            in.close();            System.out.println(ingelezenCd);        }        catch(IOException i){                    }        catch(ClassNotFoundException c){                    }    }//einde winkel.java//gui.java    private void performOpen() {        String fileName = "cd.dat";        winkel.read(fileName);    }            private void performSluit() {        String fileName = "cd.dat";        winkel.write(fileName);    }//einde gui.java//cd.javapublic class Cd implements Serializable {//einde