In what format is the object written to the file?

import java.io.*; public class Collections { public static void main(String[] args) { try(ObjectOutputStream oos = new ObjectOutputStream(new FileOutputStream("/home/arthur/Рабочий стол/text.txt"))) { Person p = new Person("Sam", 33, 178, true); oos.writeObject(p); } catch(Exception ex){ System.out.println(ex.getMessage()); } } } class Person implements Serializable{ private String name; private int age; private double height; private boolean married; Person(String n, int a, double h, boolean m){ name=n; age=a; height=h; married=m; } String getName() {return name;} int getAge(){ return age;} double getHeight(){return height;} boolean getMarried(){return married;} } 

Here is the information recorded in the file How to understand this format?