How to Write/Store an object to file in java?

Writing a Java objects to a file is called as Serialization in java. In order to do this, you have to implement the Serializable interface, and use ObjectOutputStream to write the object into a file. To do this we have created Employee class which implements java.io.Serializable.

To write an object to a stream call the writeObject() method of the ObjectOutputStream class and pass the serialized object to it.

[java]
/****************************************************************************************
* Created on 08-2011 Copyright(c) https://kodehelp.com All Rights Reserved.
****************************************************************************************/
package com.kodehelp.java.io;

import java.io.FileOutputStream;
import java.io.IOException;
import java.io.ObjectOutputStream;

/**
* Created by Vigilance India.
* User: https://kodehelp.com
* Date: Aug 5, 2011
*/
public class WriteObjectToFile {
public static void main(String args[]){
try{
Employee employee = new Employee("0001","Robert","Newyork City","IT");

FileOutputStream fos = new FileOutputStream("employee.dat");
ObjectOutputStream oos = new ObjectOutputStream(fos);

oos.writeObject(employee);

oos.flush();
oos.close();
System.out.println("Employee Object written to file employee.dat");
}catch(IOException ex){
ex.printStackTrace();
}
}

}
[/java]

import java.io.Serializable;

/**
* Created by Vigilance India.
* User: https://kodehelp.com
* Date: Aug 5, 2011
*/
public class Employee implements Serializable {
private String empId;
private String Name;
private String Address;
private String Dept;

public Employee(String empId, String name, String address, String dept) {
this.empId = empId;
this.Name = name;
this.Address = address;
this.Dept = dept;
}

public String toString(){
return "[Employee: "+empId+", "+", "+Name +", "+Address+", "+Dept+"]";
}
}

[/java]