What will be the output of the following Java code?

import java.io.*;
class streams 
{
    public static void main(String[] args)
    {
        try 
        {
      FileOutputStream fos = new FileOutputStream("serial");
      ObjectOutputStream oos = new ObjectOutputStream(fos);
      oos.writeInt(5);
      oos.flush();
      oos.close();
  }
  catch(Exception e)
        {
      System.out.println("Serialization" + e);
            System.exit(0);
        }
  try
        {
      int z;
      FileInputStream fis = new FileInputStream("serial");
      ObjectInputStream ois = new ObjectInputStream(fis);
      z = ois.readInt();
      ois.close();
      System.out.println(x);		    	
  }
  catch (Exception e) 
        {
            System.out.print("deserialization");
      System.exit(0);
  }
    }
}