Serialization and Deserialization in Java

Question

Ravi Vishwakarma · Answer

Let's explore Serialization and Deserialization in Java with simple explanations and examples.
What is Serialization?
Serialization is the process of converting a Java object into a sizing stream, so it can be:
Saved to a fileTransmitted over a networkStored in a database
This byte stream can later be deserialized back into the original object.
What is Deserialization?
Deserialization is the reverse process — converting the byte stream
back into a Java object.
Steps to Serialize and Deserialize
The class must implement the **Serializable** interface.Use **ObjectOutputStream** for serialization.Use **ObjectInputStream** for deserialization.
Example:
1. Create a Serializable Class
import java.io.Serializable;
public class Student implements Serializable {
    private String name;
    private int age;
    // Constructor
    public Student(String name, int age) {
        this.name = name;
        this.age = age;
    }
    // toString() for display
    public String toString() {
        return "Student{name='" + name + "', age=" + age + "}";
    }
}
2. Serialize the Object
import java.io.FileOutputStream;
import java.io.ObjectOutputStream;
public class SerializeExample {
    public static void main(String[] args) {
        try {
            Student student = new Student("Alice", 22);
            FileOutputStream fileOut = new FileOutputStream("student.ser");
            ObjectOutputStream out = new ObjectOutputStream(fileOut);
            out.writeObject(student);
            out.close();
            fileOut.close();
            System.out.println("Object has been serialized.");
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}
3. Deserialize the Object
import java.io.FileInputStream;
import java.io.ObjectInputStream;
public class DeserializeExample {
    public static void main(String[] args) {
        try {
            FileInputStream fileIn = new FileInputStream("student.ser");
            ObjectInputStream in = new ObjectInputStream(fileIn);
            Student student = (Student) in.readObject();
            in.close();
            fileIn.close();
            System.out.println("Deserialized Object: " + student);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}
Important Notes:
Feature
Details
transient
Skip fields from serialization
serialVersionUID
Recommended for version control of serializable classes
Must implement Serializable
Otherwise, NotSerializableException will occur
Example with transient:
private transient String password; // will not be serialized
and

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Serialization and Deserialization in Java

Ravi Vishwakarma

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1 Answers

What is Serialization?

What is Deserialization?

Steps to Serialize and Deserialize

1. Create a Serializable Class

2. Serialize the Object

3. Deserialize the Object

Important Notes:

Example with `transient`:

Liked By

Feature	Details
`transient`	Skip fields from serialization
`serialVersionUID`	Recommended for version control of serializable classes
Must implement `Serializable`	Otherwise, `NotSerializableException` will occur