public class Person implements Serializable {
  private String name;
  private int age;
  private static final long serialVersionUID = 1L; 
 
  public Person(String name, int age) {
    this.name = name;
    this.age = age;
  }  
 
  public static void main(String[] args) throws FileNotFoundException, IOException{
    Person michael = new Person("Michael", 26);
    Person peter = new Person("Peter", 37);
 
    FileOutputStream fileOutputStream = new FileOutputStream("persons.txt");
    ObjectOutputStream objectOutputStream = new ObjectOutputStream(fileOutputStream);
 
    objectOutputStream.writeObject(michael);
    objectOutputStream.writeObject(peter);    
  }
}