Question

Question 2 [8 points] Consider the class Class A below: class Class A implements Serializable{ int a; static int b; transient int c; String s; // Constructor public Class A (int a, int b, int c, Strings){ this.a = a; this.b = b; this.c = c; this.s = s; Complete the class Test to test the serialization and deserialization of the objects of class Class A. State the possible variable values following deserialization. public class Test{ public static void printData(ClassA objectA){ System.out.println("a = " + objectA.a); System.out.println("b = " + objectA.b); System.out.println("c = " + objectA.c); System.out.println("s =" + objectA.s); public static void main(String[] args) { ClassA A = new ClassA(10, 100, 1000, "10000"); String fileName = "fileClassA.txt"; // Serialization code here // Deserialization code here

the answer must be in java. thank you

Answer 1

Code:

import java.io.*;

class classA implements Serializable {
   int a;
   static int b;
   transient int c;
   String s;
  
   public classA(int a, int b, int c, String s)
   {
       this.a = a;
       this.b = b;
       this.c = c;
       this.s = s;
   }
}

class Test {
   public static void printdata(classA objectA)
   {
       System.out.println("a = " + objectA.a);
       System.out.println("b = " + objectA.b);
       System.out.println("c = " + objectA.c);
       System.out.println("s = " + objectA.s);
   }

   public static void main(String[] args)
   {
       classA A = new classA(10, 100, 1000, "10000");
       String fileName = "fileClassA.txt";

       // Serialization code
       try {
           System.out.println("Before Serialization:");
           printdata(A);
           FileOutputStream fos = new FileOutputStream (fileName);
           ObjectOutputStream out = new ObjectOutputStream(fos);
           out.writeObject(A); //writes the byte stream to file
           out.close();
           fos.close();
       }
       catch (Exception e) { //To catch IOException
           e.printStackTrace();
           System.out.println(e);
       }

       A = null;
       // Deserialization
       try {
           FileInputStream file = new FileInputStream (fileName);
           ObjectInputStream in = new ObjectInputStream (file);
           A = (classA)in.readObject(); //read byte stream from file and typecast to required class
           in.close();
           file.close();
           System.out.println("After Deserialization:");
           printdata(A);
       }
       catch (Exception e) { //To catch IOException or ClassNotFoundException
           e.printStackTrace();
           System.out.println(e);
       }
   }
}

Output:

Serialization: Converting state of an object into a byte stream. Uses writeObject()

Deserialization: Byte stream recreates the actual Java object in memory. Uses readObject()

Transient variables and Static variables cannot be serialized, so when transient variable is deserialized it is initialized as 0 or NULL (default value of object) and static variable value will loaded from the class