Java serialization

What is serialization?

Serialization. Output a Java object as a byte array. By serializing it, you can write it to a file.

Serializable interface

Classes that implement the Serializable interface can be serialized.

Write the object to a file


public class Person implements Serializable {

    private String greeting = "hello";

    Person(String greeting) {
        this.greeting = greeting;

public class SerializeSample {
    public static void main(String[] args) {
        var person = new Person("hello");
        try {
            var objectOutputStream = new ObjectOutputStream(new FileOutputStream("person.txt"));
        } catch (IOException e) {
            throw new RuntimeException(e);

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