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Java Serializable example 14 January 2013
In this tutorial you will learn how to serialize a Java object to the file system and read it afterwards.
Introduction This tutorial will demonstrate how to serialize a Java object to the file system. After serialization we will read it again into memory.
Environment:
Ubuntu 12.04 JDK 1.7.0.09
A simple class Let's define a simple class to use in this example:
User class
package com . byteslounge . serialization ;
import java . io . Serializable ;
public class User implements Serializable {
private static final long serialVersionUID = - 388040256197985515L ;
private int id ;
private String username ;
private String email ;
public User ( int id , String username , String email ) {
this . id = id ;
this . username = username ;
this . email = email ;
}
public int getId () {
return id ;
}
public String getUsername () {
return username ;
}
public String getEmail () {
return email ;
}
}
Note that we are implementing the Serializable interface. This is required to make User class serializable.
Serializing Serializing a User instance to the file system:
Serializing
User userWrite = new User ( 1 , "johndoe" , "John Doe" );
FileOutputStream fos = new FileOutputStream ( "testfile" );
ObjectOutputStream oos = new ObjectOutputStream ( fos );
oos . writeObject ( userWrite );
oos . flush ();
oos . close ();
Deserializing Deserializing a User instance from the file system:
Deserializing
User userRead ;
FileInputStream fis = new FileInputStream ( "testfile" );
ObjectInputStream ois = new ObjectInputStream ( fis );
userRead = ( User ) ois . readObject ();
ois . close ();
Testing Let's create a simple test class:
Main.java
package com . byteslounge . serialization ;
import java . io . FileInputStream ;
import java . io . FileOutputStream ;
import java . io . ObjectInputStream ;
import java . io . ObjectOutputStream ;
public class Main {
public static void main ( String [] args )
throws Exception {
User userWrite = new User ( 1 , "johndoe" , "John Doe" );
FileOutputStream fos = new FileOutputStream ( "testfile" );
ObjectOutputStream oos = new ObjectOutputStream ( fos );
oos . writeObject ( userWrite );
oos . flush ();
oos . close ();
User userRead ;
FileInputStream fis = new FileInputStream ( "testfile" );
ObjectInputStream ois = new ObjectInputStream ( fis );
userRead = ( User ) ois . readObject ();
ois . close ();
System . out . println ( "username: " + userRead . getUsername ());
}
}
When we run the test the following output is generated:
username: johndoe
The example source code is available at the end of this page.
Download source code from this article
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About the author
Gonçalo Marques is a Software Engineer with several years of experience in software development and architecture definition. During this period his main focus was delivering software solutions in banking, telecommunications and governmental areas. He created the Bytes Lounge website with one ultimate goal: share his knowledge with the software development community. His main area of expertise is Java and open source.
GitHub profile:
https://github.com/gonmarques He is also the author of the
WiFi File Browser Android application:
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