What happens if we implement serializable interface in Java?

If a super class implements Serializable, then its sub classes do automatically. When an instance of a serializable class is deserialized, the constructor doesn’t run. If a super class doesn’t implement Serializable, then when a subclass object is deserialized, the super class constructor will run.

What happens when a class implements serializable?

To serialize an object means to convert its state to a byte stream so that the byte stream can be reverted back into a copy of the object. A Java object is serializable if its class or any of its superclasses implements either the java. io.

What happens when you change an object that has been serialized and written to a file?

Well, serialization allows us to convert the state of an object into a byte stream, which then can be saved into a file on the local disk or sent over the network to any other machine. And deserialization allows us to reverse the process, which means reconverting the serialized byte stream to an object again.

What happens if your serializable class contains a member which is not serializable how do you fix it?

It’ll throw a NotSerializableException when you try to Serialize it. To avoid that, make that field a transient field. The class will not be serialisable, unless the field is declared transient (which will prevent the field from being serialised, i.e. it will not be saved).

Which methods should be implemented by a class if it implements Serializable interface?

It must implement a writeExternal method to save the state of the object. Also, it must explicitly coordinate with its supertype to save its state. It must implement a readExternal method to read the data written by the writeExternal method from the stream and restore the state of the object.

What happens if I don’t implement Serializable?

3 Answers. The Student would not be Serializable, and it will act like a normal class. Serialization is the conversion of an object to a series of bytes, so that the object can be easily saved to persistent storage or streamed across a communication link.

What will happen if we don’t implement Serializable?

What happens if the object to be serialized?

Ans) If the object to be serialized includes references to the other objects, then all those object’s state also will be saved as the part of the serialized state of the object in question.

What happens if an object is Serializable but it includes a reference to a non Serializable object?

Q7) What happens if an object is serializable but it includes a reference to a non-serializable object? Ans- If you try to serialize an object of a class which implements serializable, but the object includes a reference to an non-serializable class then a ‘NotSerializableException’ will be thrown at runtime.

When should a class implements Serializable?

So, implement the Serializable interface when you need to store a copy of the object, send them to another process which runs on the same system or over the network. Because you want to store or send an object. It makes storing and sending objects easy. It has nothing to do with security.