Implementing a Serializable Singleton

In Singeton classes only one instance will be created. We are going to serialize the class. This can be done very easily. What we need to do is to implement a java.io.Serializable interface. We will use a method of Serializable interface that is readResolve().

readResolve(): It returns Object and throw ObjectStreamException

Code of the program is given below:


import java.io.*;

 

 public class SerializableSingleton implements java.io.Serializable {

   

  static SerializableSingleton singleton;

  protected SerializableSingleton() 

   {

   // Exists only to thwart instantiation.

   }

   private Object readResolve() 

   {

  return instancd;

   }

   public static void main(String args[])

   {

   singleton = new SerializableSingleton();

   singleton.readResolve();

   }

 }

Download this program

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