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17.	What happens to the object references included in the object?
	The serialization mechanism generates an object graph for serialization. Thus it determines whether the included object references are serializable or not, this is a recursive process. Thus when an object is serialized, all the included objects are also serializable along with the original object.
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18.	How to make a class or a bean serializable?
	By implementing either the java.io.Serializable interface, or the java.io.Externalizable interface. As long as one class in a class's inheritance hierarchy implements Serializable or Externalizable, that class is serializable.
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19.	What is the difference between the file and random access file classes?
	The File class encapsulates the files and directories of the local file system. The RandomAccessFile class provides the methods needed to directly access data contained in any part of a file.
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20.	How many methods in the serializable interface?
	There is no method in the serializable interface. The serializable interface acts as a marker, telling the object serialization tools that your class is serializable.
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