12 - Example with transient (2)

public class AnotherClass {
    int aInt = 7;
}

public class Main implements Serializable {

    int bInt = 5;

    AnotherClass aAnotherClass = new AnotherClass();

    public static void main(String[] args) throws Exception {

        ObjectOutputStream oos = new ObjectOutputStream(new FileOutputStream("Main.ser"));

        Main aMain = new Main();

        System.out.println("" + aMain.bInt + aMain.aAnotherClass.aInt);

        oos.writeObject(aMain);

        oos.close();

        ObjectInputStream ois = new ObjectInputStream(new FileInputStream("Main.ser"));

        aMain = (Main) ois.readObject();

        ois.close();

        System.out.println("" + aMain.bInt + aMain.aAnotherClass.aInt);

    }

}

run:

57

Exception in thread "main" java.io.NotSerializableException: javaapplication35.AnotherClass

        at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1156)

        at java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1509)

        at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1474)

        at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1392)

        at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1150)

        at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:326)

        at javaapplication35.Main.main(Main.java:30)

Java Result: 1

As you can see it is not possible to serialize a reference to an object that is NOT serializable !