How to do object Serialization

import java.io.*;

public class SerializableEmployee implements Serializable {
    String name;
    int age;
    double salary;

    SerializableEmployee(String name, int age, double salary) {
        this.name = name;
        this.age = age;
        this.salary = salary;
    }

    public void showDetails() {
        System.out.println("Name   : " + name);
        System.out.println("Age    : " + age);
        System.out.println("Salary : " + salary);
    }
}

class ObjectSerializationDemo {
    void writeData() {
        SerializableEmployee db[] = {
                new SerializableEmployee("Tom", 25, 1200.25),
                new SerializableEmployee("Dick", 22, 1223.25),
                new SerializableEmployee("Harry", 25, 1345.25) };
        try {
            FileOutputStream out = new FileOutputStream("c://employee.txt");
            try {
                ObjectOutputStream sout = new ObjectOutputStream(out);
                for (int i = 0; i < db.length; i++) {
                    sout.writeObject(db[i]);
                }
                sout.close();

            } catch (Exception e) {
                        e.printStackTrace();
        }
    }
     void readData() {
        try {
            FileInputStream in = new FileInputStream("c://employee.txt");
            try {
                ObjectInputStream sin = new ObjectInputStream(in);
                try {
                    SerializableEmployee se = (SerializableEmployee) sin
                            .readObject();
                    se.showDetails();
                    se = (SerializableEmployee) sin.readObject();
                    se.showDetails();
                    se = (SerializableEmployee) sin.readObject();
                    se.showDetails();

                    sin.close();

                } catch (Exception e) {
                        e.printStackTrace();
                }
        }

    public static void main(String[] args) {
        ObjectSerializationDemo impl = new ObjectSerializationDemo();
        impl.writeData();
        impl.readData();

    }

}