http://www.martinfowler.com/bliki/FluentInterface.html http://stackoverflow.com/questions/31733262/what-is-this-the-name-of-this-java-state-based-design-pattern
http://www.martinfowler.com/bliki/FluentInterface.html
http://stackoverflow.com/questions/31733262/what-is-this-the-name-of-this-java-state-based-design-pattern