how to write the program for sending mail

package core;

import java.util.*;

import javax.mail.Message;

import javax.mail.MessagingException;

import javax.mail.PasswordAuthentication;

import javax.mail.Session;

import javax.mail.Transport;

import javax.mail.internet.InternetAddress;

import javax.mail.internet.MimeMessage;

/**

 *

 * @author SRIKANTH GANJI

 */

public class JavaMail {

    public static void main(String...args) {

        final String username = "srikanth.kanth35@gmail.com";// your Mail id (username)

        final String password = "*********";

        Properties props = new Properties();

        props.put("mail.smtp.auth", "true");

        props.put("mail.smtp.starttls.enable", "true");

        props.put("mail.smtp.host", "smtp.gmail.com");

        props.put("mail.smtp.port", "587"); 

        Session session = Session.getInstance(props,

                new javax.mail.Authenticator() {

                    protected PasswordAuthentication getPasswordAuthentication() {

                        return new PasswordAuthentication(username, password);

                    }

                });

        try {

            Message message = new MimeMessage(session);

            message.setFrom(new InternetAddress("from@no-spam.com"));

             

            message.setRecipients(Message.RecipientType.TO,

                    InternetAddress.parse("srikanth8988@gmail.com"));// receiverMail id.

            message.setSubject("Srikanth Send Mail from Java program");

            message.setText("Hello it's from java program,"

                    + "\n\n What Ever YOur Message ");

            Transport.send(message);

            System.out.println("Done");

        } catch (MessagingException e) {

            throw new RuntimeException(e);

        }

    }

   }