What does Serializable mean in java?

Serializable in Java is an interface used to persist object state and transmit objects over the network. It requires the implementing class to provide getter/setter methods and no-argument constructors. Use ObjectOutputStream.writeObject() for serialization and ObjectInputStream.readObject() for deserialization.

Serializable in Java

What is Serializable?

In Java, Serializable is an interface, which means that the class or the implementation class of the interface can save the state of the object to the output stream through the serialization mechanism, and can retrieve it from the output stream through the deserialization mechanism. Restores the state of an object from the input stream.

Why use Serializable?

The Serializable interface is mainly used in the following scenarios:

• Object persistence: Serializable objects can be saved to files or databases for Persist the state of an object so that it can be restored later.
• Remote Procedure Call (RPC): Serializable objects can be transmitted over the network to communicate between different JVM instances.
• Distributed computing: Serializable objects can be dispersed across different servers for processing in a distributed system.

How to implement Serializable?

To implement the Serializable interface, a class or interface needs to:

1. Declare to implement the java.io.Serializable interface.
2. Provide a private getter and setter method for each non-transient field in the object.
3. Optionally provide a parameterless constructor to create a new instance during deserialization.

Example:

public class Person implements Serializable {

    private String name;
    private int age;

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public int getAge() {
        return age;
    }

    public void setAge(int age) {
        this.age = age;
    }
}

Using Serializable

To use a Serializable object, you can serialize it to the output stream and then deserialize from the input stream. You can use the following API:

• Serialization: ObjectOutputStream#writeObject(Object)
• Deserialization: ObjectInputStream#readObject()

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