import java.io.Serializable;

public class Person implements Serializable {

    private String greeting = "hello";

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

import java.io.FileOutputStream;
import java.io.IOException;
import java.io.ObjectOutputStream;

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

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