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Convert from a Constructor to a Builder

Daniel Afonso

Joined: Jan 27, 2011
Posts: 16

Hi have the following code:

How would I convert this to a Builder. I'm pretty new on this.
Campbell Ritchie

Joined: Oct 13, 2005
Posts: 41586
Several ways to do it. You will have to consider whether you want to permit any changes to those fields. You should also consider whether it is wise to have so many parameters for your constructor; for one thing it makes the code hard to read, and I had to insert some line breaks.That is one way to do it. You can set up lots of methods for different combinations.
  • In that case they all have the structure Address a = getBasicAddress(...); ... return a;
  • The getBasicAddress method requires postCode and town be not null, and other null fields are changed to "", so there are no nulls.
  • You can do validation of the fields in those methods, eg with a regex for post codes.
  • There are other ways to do it, too.
    I agree. Here's the link:
    subject: Convert from a Constructor to a Builder