How Inheritance Affects Serialization in java?

Question

How Inheritance Affects Serialization in java with an example?

Vulpes · Answer

The basic rule is that if a super-class is serializable, then its sub-classes are automatically serializable. Here's an example: import java.io.*; class Animal implements Serializable { public String name; public String type; public int age; public Animal(String name, String type, int age) { this.name = name; this.type = type; this.age = age; } public String toString() { return "Name = " + name + ", Type = " + type + ", Age = " + age; } } public class Dog extends Animal // no need to implement Serializable again { public String breed; public Dog(String name, int age, String breed) { super(name, "Dog", age); this.breed = breed; } public String toString() { return super.toString() + " ,Breed = " + breed; } public static void main(String[] args) { String filename = "dog.ser"; Dog d = new Dog("Rover", 4, "Spaniel"); // serialize the object to file FileOutputStream fos = null; ObjectOutputStream out = null; try { fos = new FileOutputStream(filename); out = new ObjectOutputStream(fos); out.writeObject(d); out.close(); } catch (Exception ex) { ex.printStackTrace(); } // deserialize the object from file FileInputStream fis = null; ObjectInputStream in = null; try { fis = new FileInputStream(filename); in = new ObjectInputStream(fis); d = (Dog)in.readObject(); in.close(); } catch (Exception ex) { ex.printStackTrace(); } System.out.println(d); } } The output is: Name = Rover, Type = Dog, Age = 4 ,Breed = Spaniel

Abhijeet Singh · Answer

Thank you sir.. :)

How Inheritance Affects Serialization in java?

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