🚀 Java Interview Questions – Episode 12

💡 What is the Serializable interface in Java?

📦 And why do we use it?

The Serializable interface is a marker interface — it doesn’t have any methods, but it signals the JVM that a class can be serialized.

🔄 Serialization = converting an object into a stream of bytes, so it can be:

✅ Saved to a file

✅ Sent over a network

✅ Stored in a cache

✅ Transferred between JVMs

🧩 To make a class serializable, just implement:

class User implements Serializable { ... }

⚠️ Don't forget:

Transient fields are not serialized.

All nested objects must also be serializable.