RSS Feed for This PostCurrent Article

Design Pattern in Java 101 – Builder Pattern (Creational Pattern)

Download Source Code

Builder pattern is used to construct a complex object from simple objects step by step.


I have a Message class

public class Message {
    private String sender;
    private String recipient;
    private String header;
    private String body;

    public String getSender() {
        return sender;

    public void setSender(String sender) {
        this.sender = sender;

    public String getRecipient() {
        return recipient;

    public void setRecipient(String recipient) {
        this.recipient = recipient;

    public String getHeader() {
        return header;

    public void setHeader(String header) {
        this.header = header;

    public String getBody() {
        return body;

    public void setBody(String body) {
        this.body = body;

    public String toString() {
                "Sender: " + sender + "\n" +
                "Recipient: " + recipient + "\n" +
                "Header: " + header + "\n" +
                "Body: " + body ;


Then create a MessageBuilder class

public abstract class MessageBuilder {
    protected Message message;

    public Message getMessage() {
        return message;

    public void setMessage(Message message) {
        this.message = message;

    public void createMessage() {
        message = new Message();

    public void constructMessage(){
        message = new Message();
    public void constructSender(String sender){

    public void constructRecipient(String recipient){

    public abstract void constructMessageHeader();
    public abstract void constructMessageBody(String body);

I can build different mesages, e.g. SMSMessageBuilder and MMSMessageBuilder

public class SMSMessageBuilder extends MessageBuilder {

    public void constructMessageHeader() {
        message.setHeader("SMS header");

    public void constructMessageBody(String body) {

public class MMSMessageBuilder extends MessageBuilder {

    public void constructMessageHeader() {
       message.setHeader("MMS header");

    public void constructMessageBody(String body) {

ContentProvider class creates the required message using the relevant builder

public class ContentProvider {

    private MessageBuilder messageBuilder;

    public MessageBuilder getMessageBuilder() {
        return messageBuilder;

    public void setMessageBuilder(MessageBuilder messageBuilder) {
        this.messageBuilder = messageBuilder;

    public Message getMessage() {
        return messageBuilder.getMessage();

    public Message createMessage(
            MessageBuilder messageBuilder,
            String sender,
            String recipient,
            String message) {
        return messageBuilder.getMessage();

To test it

public class TestPattern {

    public static void main(String[] args){
        ContentProvider contentProvider = new ContentProvider();
        MessageBuilder smsMessageBuilder = new SMSMessageBuilder();
        MessageBuilder mmsMessageBuilder = new MMSMessageBuilder();

        Message sms = 
             smsMessageBuilder, "1234", "5678", "SMS message");
        Message mms = 
             mmsMessageBuilder, "1234", "5678", "MMS message");


The output

Sender: 1234
Recipient: 5678
Header: SMS header
Body: SMS message

Sender: 1234
Recipient: 5678
Header: MMS header
Body: MMS message

Trackback URL

RSS Feed for This Post18 Comment(s)

  1. Rhett Stewart | Apr 18, 2008 | Reply

    montmorilonite abasedness sanballat absciss penalizable demos oversystematic conqueror

  2. Http:// | May 3, 2013 | Reply

    I have been browsing on-line greater than 3 hours as
    of late, but I never found any fascinating article like yours.
    It is beautiful value sufficient for me. In my
    view, if all web owners and bloggers made just right content material as you probably did, the web will be
    much more useful than ever before.

  3. Http:// | May 12, 2013 | Reply

    I am curious to find out what blog system you have been using?
    I’m experiencing some small security issues with my latest blog and I’d like to find something
    more risk-free. Do you have any suggestions?

  4. Janelle | May 15, 2013 | Reply

    How long has insurance cover been with us and where on earth does it
    originate from. A home is more than a structure made up of brick
    and concrete for some people as they invest a lot of emotions in to it, therefore it needs
    to be protected. Through using these particular measures you might
    find your cheap home insurance quotes just at your fingertips.

  5. Lashawn | May 15, 2013 | Reply

    Superb post however I was wondering if you could write a litte more on this topic?
    I’d be very grateful if you could elaborate a little bit more. Bless you!

  6. Jenifer | May 16, 2013 | Reply

    I think the admin of this site is actually working hard for his site, as here every data
    is quality based information.

  7. building insurance quotes | May 16, 2013 | Reply

    But if you use the internet, you should be able to find cheap homeowner
    insurance policies in no time. No matter what
    route you choose, the final point is to get a bunch of homeowners’ insurance quotes and what the policies cover, then do a side-by-side comparison, weed out the ones you don’t
    like. Employee motivation is the classic response on
    this matter.

  8. Del | May 29, 2013 | Reply

    Visit websites of all of the chosen companies and scrutinize the offered plans very carefully.
    The Consolidated Omnibus Budget Reconciliation
    Act (COBRA) of 1986 does not confer any new benefits. the government also revised upward the numbers
    for August and September, showing 110,000 fewer jobs

  9. Home Insurance | Jun 5, 2013 | Reply

    To protect your assets, you should ask to your insurance agent for additional coverage.

    Home insurance company you choose to apply with a client by performing a credit check will check
    your credit score. First determine the extent of the
    injury and if medical help is necessary.

  10. home insurance price comparison sites uk | Jun 8, 2013 | Reply

    I’ve been surfing online more than 4 hours today, yet I never found any interesting article like yours. It is pretty worth enough for me. Personally, if all site owners and bloggers made good content as you did, the internet will be much more useful than ever before.

  11. one day car insurance quote | Jun 16, 2013 | Reply

    certainly like your web site however you have to take a look at the
    spelling on quite a few of your posts. Several of them are rife with spelling problems and I find it very troublesome to inform the reality nevertheless I’ll definitely come again again.

  12. Hannah | Jun 17, 2013 | Reply

    Do you have a spam issue on this site; I also am a blogger, and I was wanting to know your situation; many of us have created some
    nice procedures and we are looking to trade
    solutions with others, please shoot me an e-mail if interested.

  13. cheap one day car insurance uk | Jun 17, 2013 | Reply

    Good answer back in return of this difficulty with solid arguments and explaining everything
    on the topic of that.

  14. best payday loans | Jun 22, 2013 | Reply

    I read this piece of writing completely about the resemblance of most recent and previous technologies,
    it’s remarkable article.

  15. | Jul 4, 2013 | Reply

    I visited several web sites but the audio quality for audio songs present
    at this site is in fact excellent.

  16. Keisha | Jul 5, 2013 | Reply

    Hi to every , as I am truly keen of reading this web site’s post to be updated regularly. It includes fastidious stuff.

  17. compare home insurance quotes | Jul 7, 2013 | Reply

    Hmm it appears like your site ate my first comment (it was super long) so I guess I’ll just sum it up what I wrote and say, I’m thoroughly enjoying your
    blog. I as well am an aspiring blog blogger but I’m still new to the whole thing. Do you have any tips and hints for newbie blog writers? I’d definitely appreciate it.

  18. Compare Home Insurance companies | Jul 8, 2013 | Reply

    Hey! Someone in my Myspace group shared this website with us so I came to take a look.
    I’m definitely loving the information. I’m book-marking and
    will be tweeting this to my followers! Great blog and amazing
    design and style.

RSS Feed for This PostPost a Comment

Refresh Image