Step by Step solution about How to resolve the algorithm Object serialization step by step in the Kotlin programming language

Explanation:

1. Class Definition:

• Entity: This is the base class for all entities. It has a single property, name, and a toString() method to return the name.
• Person: This is a subclass of Entity that represents a person. It inherits the name property and has its own toString() method.

2. Serialization and Deserialization:

• Serializable: Both Entity and Person implement the Serializable interface, which allows their instances to be converted into a stream of bytes for storage and later reconstructed into objects.
• SerialVersionUID: Each serializable class has a unique serialVersionUID that identifies its format during serialization and deserialization. Declaring serialVersionUID explicitly ensures compatibility across versions, reducing the risk of serialization errors.

3. Main Function:

• Creating Instances: Two instances are created: instance1 (a Person object) and instance2 (an Entity object).
• Serialization: Two files are serialized and stored in a file named objects.dat. The ObjectOutputStream is used to write the instances to the file.

val out = ObjectOutputStream(FileOutputStream("objects.dat"))
out.writeObject(instance1)
out.writeObject(instance2)
out.close()

• Deserialization: The serialized instances are read back from the file and reconstructed into objects. The ObjectInputStream is used to read the byte streams and create objects.

val inp = ObjectInputStream(FileInputStream("objects.dat"))
val readObject1 = inp.readObject()
val readObject2 = inp.readObject()
inp.close()

4. Printing Results:

• The deserialized instances are printed using their toString() methods.

println(readObject1)
println(readObject2)

Output:

Brian
Entity
Deserialized...
Brian
Entity

This code demonstrates the use of Java Serialization in Kotlin to store and retrieve objects that implement the Serializable interface. It shows how to create, serialize, deserialize, and print instances of custom classes.

// version 1.2.0

import java.io.*

open class Entity(val name: String = "Entity"): Serializable {
    override fun toString() = name

    companion object {
        val serialVersionUID = 3504465751164822571L
    }
}

class Person(name: String = "Brian"): Entity(name), Serializable {
    companion object {
        val serialVersionUID = -9170445713373959735L
    }
}

fun main(args: Array<String>) {
    val instance1 = Person()
    println(instance1)

    val instance2 = Entity()
    println(instance2)

    // serialize
    try {
        val out = ObjectOutputStream(FileOutputStream("objects.dat"))
        out.writeObject(instance1)
        out.writeObject(instance2)
        out.close()
        println("Serialized...")
    }
    catch (e: IOException) {
        println("Error occurred whilst serializing")
        System.exit(1)
    }

    // deserialize 
    try {
        val inp = ObjectInputStream(FileInputStream("objects.dat"))
        val readObject1 = inp.readObject()
        val readObject2 = inp.readObject()
        inp.close()
        println("Deserialized...")
        println(readObject1)
        println(readObject2)        
    }
    catch (e: IOException) {
        println("Error occurred whilst deserializing")
        System.exit(1)
    }
    catch (e: ClassNotFoundException) {
        println("Unknown class for deserialized object")
        System.exit(1)
    }
}