usage help

[Thomas Ricaud]

Hi,

I'm struggling with a specific use case.

Using the example your giving I'm trying to create a Person object and then modify it's age.

I did create the Person interface and the builder is indeed generated.

My issue is when i use the object. I can't find a way to update a value like age.

Person thomas = new Person.Builder().setAge(41).build();
thomas.setAge(42);

The setAge function doesn't exist

I can not find a class i could extend to create such a function or any logic to implement.

Am i  missing anything ?

Thanks

[Thomas Ricaud]

After putting my thinking cap on :) , the builder Pattern is best for immutable object. 

So i guess that's why i can't set my value: to prevent the usage of this annotation on a mutable object.

[Chris Purcell]

Hi Thomas!

That's exactly it: built objects are immutable. If you want to make a new Person with an updated age, you can do:

Person oldThomas = new Person.Builder()

        .mergeFrom(thomas)

        .setAge(42)

        .build();

Happy coding!

Chris

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