Java でのシリアル化と逆シリアル化

import java.io.FileOutputStream;
import java.io.ObjectOutputStream;
import java.io.Serializable;

class Employee implements Serializable {
    private static final long serialVersionUID = 1L;
    String name;
    int id;

    public Employee(String name, int id) {
        this.name = name;
        this.id = id;
    }
}

public class SerializeDemo {
    public static void main(String[] args) {
        Employee emp = new Employee("John Doe", 101);

        try (FileOutputStream fileOut = new FileOutputStream("employee.ser");
             ObjectOutputStream out = new ObjectOutputStream(fileOut)) {
            out.writeObject(emp);
            System.out.println("Serialized data is saved in employee.ser");
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

import java.io.FileInputStream;
import java.io.ObjectInputStream;

public class DeserializeDemo {
    public static void main(String[] args) {
        Employee emp = null;

        try (FileInputStream fileIn = new FileInputStream("employee.ser");
             ObjectInputStream in = new ObjectInputStream(fileIn)) {
            emp = (Employee) in.readObject();
            System.out.println("Deserialized Employee...");
            System.out.println("Name: " + emp.name);
            System.out.println("ID: " + emp.id);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

import java.io.*;

class Student implements Serializable {
    private  static   final long serialVersionUId = 1l;
    private String name ;
    private int  age;
    private String Address;

    public Student(String name,int age,String Address){
        this.name = name;
        this.age = age;
        this.Address = Address;
    }
    public void setName(String name){
        this.name = name;
    }
    public void setAge(int age){
        this.age = age;
    }
    public void setAddress(String Address){
        this.Address = Address;
    }

    public String getName(){
        return name;
    }
    public String getAddress(){
        return Address;
    }
    public int getAge(){
        return age;
    }


    public String toString(){
        return ("Student name is "+this.getName()+", age is "+this.getAge()+", and address is "+this.getAddress());
    }
}

public class  JAVA3_Serialization {
    // when you implement Serializable then you must be write a serialVersionUId because when it serialise and deserialize it uniquely identify in the network
    // when u update ur object or anything then you have to update the serialVersionUId increment .
    // private  static   final long serialVersionUId = 1l;

    // transient  int x ;
    // If you do not want a particular value to serialise and Deserialize.
    // the value x, when you don't serialise and Deserialize Then transient you used.

    public static void main(String[] args) {

        Student student = new Student("kanha",21,"angul odisha");

        String filename = "D:\Advance JAVA\CLS3 JAVA\Test.txt"; // store the data in this location
        FileOutputStream fileOut = null; // write file
        ObjectOutputStream objOut = null; // create object
        //Serialization
        try {
            fileOut = new FileOutputStream(filename);
            objOut = new ObjectOutputStream(fileOut);
            objOut.writeObject(student);

            objOut.close();
            fileOut.close();

            System.out.println("Object has been serialise =\n"+student);
        } catch (IOException ex){
            System.out.println("error will occure");
        }

        //Deserialization
        FileInputStream fileIn = null;
        ObjectInputStream objIn = null;
        try {
            fileIn = new FileInputStream(filename);
            objIn = new ObjectInputStream(fileIn);
            Student object =(Student) objIn.readObject();
            System.out.println("object has been Deserialization =\n"+object);

            objIn.close();
            fileIn.close();

        } catch (IOException e) {
            throw new RuntimeException(e);
        } catch (ClassNotFoundException e) {
            throw new RuntimeException(e);
        }
    }
}