Serialization

title: Serialization in Java description: Object ko byte stream mein convert karna

Object ko byte stream mein convert karna — file/network pe save/send karna.

Serializable Interface

java exampleWoHoTech

import java.io.Serializable;

class Student implements Serializable {
    private static final long serialVersionUID = 1L; // Version control

    String name;
    int age;
    transient String password; // transient — serialize nahi hoga

    Student(String name, int age, String password) {
        this.name = name;
        this.age = age;
        this.password = password;
    }

    @Override
    public String toString() {
        return "Student{name=" + name + ", age=" + age + ", password=" + password + "}";
    }
}

ObjectOutputStream — Serialize karna

java exampleWoHoTech

Student s = new Student("Ram", 20, "secret123");
System.out.println("Before: " + s);

try (ObjectOutputStream oos = new ObjectOutputStream(new FileOutputStream("student.ser"))) {
    oos.writeObject(s);
    System.out.println("Serialized!");
} catch (IOException e) {
    e.printStackTrace();
}

Multiple Objects Serialize karna

java exampleWoHoTech

List<Student> students = Arrays.asList(
    new Student("Ram", 20, "pass1"),
    new Student("Shyam", 22, "pass2")
);

try (ObjectOutputStream oos = new ObjectOutputStream(new FileOutputStream("students.ser"))) {
    oos.writeObject(students);
}

serialVersionUID kyun?

Class mein change aane par deserialization fail ho sakti hai agar UID match nahi kiya.

java exampleWoHoTech

private static final long serialVersionUID = 1L;

title: Serialization in Java description: Object ko byte stream mein convert karna

Object ko byte stream mein convert karna — file/network pe save/send karna.

Serializable Interface

java exampleWoHoTech

import java.io.Serializable;

class Student implements Serializable {
    private static final long serialVersionUID = 1L; // Version control

    String name;
    int age;
    transient String password; // transient — serialize nahi hoga

    Student(String name, int age, String password) {
        this.name = name;
        this.age = age;
        this.password = password;
    }

    @Override
    public String toString() {
        return "Student{name=" + name + ", age=" + age + ", password=" + password + "}";
    }
}

ObjectOutputStream — Serialize karna

java exampleWoHoTech

Student s = new Student("Ram", 20, "secret123");
System.out.println("Before: " + s);

try (ObjectOutputStream oos = new ObjectOutputStream(new FileOutputStream("student.ser"))) {
    oos.writeObject(s);
    System.out.println("Serialized!");
} catch (IOException e) {
    e.printStackTrace();
}

Multiple Objects Serialize karna

java exampleWoHoTech

List<Student> students = Arrays.asList(
    new Student("Ram", 20, "pass1"),
    new Student("Shyam", 22, "pass2")
);

try (ObjectOutputStream oos = new ObjectOutputStream(new FileOutputStream("students.ser"))) {
    oos.writeObject(students);
}

serialVersionUID kyun?

Class mein change aane par deserialization fail ho sakti hai agar UID match nahi kiya.

java exampleWoHoTech

private static final long serialVersionUID = 1L;

Serialization

Serializable Interface

ObjectOutputStream — Serialize karna

Multiple Objects Serialize karna

serialVersionUID kyun?

Continue learning this concept

Serialization

Serializable Interface

ObjectOutputStream — Serialize karna

Multiple Objects Serialize karna

serialVersionUID kyun?

Continue learning this concept