The following code defines a Person class that implements the Serializable interface.
The Person class contains three fields: name, gender, and height.
It overrides the toString() method and returns the Person description.
The code write Person objects to a person.ser file.
import java.io.File; import java.io.FileOutputStream; import java.io.IOException; import java.io.ObjectOutputStream; import java.io.Serializable; class Person implements Serializable { private String name = "Unknown"; private String gender = "Unknown"; private double height = Double.NaN; public Person(String name, String gender, double height) { this.name = name; this.gender = gender; this.height = height; }//from w w w.j a v a 2 s.c o m @Override public String toString() { return "Name: " + this.name + ", Gender: " + this.gender + ", Height: " + this.height; } } public class Main { public static void main(String[] args) { // Create three Person objects Person a = new Person("A", "X", 6.7); Person b = new Person("B", "Y", 5.7); Person c = new Person("C", "Z", 5.4); // The output file File fileObject = new File("person.ser"); try (ObjectOutputStream oos = new ObjectOutputStream(new FileOutputStream( fileObject))) { // Write (or serialize) the objects to the object output stream oos.writeObject(a); oos.writeObject(b); oos.writeObject(c); // Display the serialized objects on the standard output System.out.println(a); System.out.println(b); System.out.println(c); // Print the output path System.out.println("Objects were written to " + fileObject.getAbsolutePath()); } catch (IOException e) { e.printStackTrace(); } } }