Use Builder Pattern to refactor javaparser

[LlorandoLau]

Hi, thanks a lot for your great project.
Here is some advice. Would you consider using Builder Pattern to refactor this wonderful project.
It would deduce the repeat codes that use to concat, statement the Expression. And help coder focus on the construction of their business.
I'm do the refactoring now. It's my pleasure to hear your response and maybe a day I could contribute to this project.

[jlerbsc]

Unfortunately, this would certainly mean no major changes to the API, which would have repercussions on the JP community, which is not desirable.