public class PersonBuilder {

    public static FirstNameStep newBuilder() {
        return new Steps();
    }

    private PersonBuilder() {
    }

    public static interface FirstNameStep {
        LastNameStep firstName(String string);
    }

    public static interface LastNameStep {
        RemainingSteps lastName(String value);
    }

    public static interface RemainingSteps {

        Person build();
        RemainingSteps dateOfBirth(Date date);

    }

    private static class Steps implements FirstNameStep, LastNameStep, RemainingSteps {
        private String firstName;
        private String lastName;
        private Date dateOfBirth;

        public LastNameStep firstName(String value) {
            this.firstName = value;
            return this;
        }

        public RemainingSteps lastName(String value) {
            this.lastName = value;
            return this;
        }

        public RemainingSteps dateOfBirth(Date value) {
            this.dateOfBirth = value;
            return this;
        }

        public Person build() {
            return new Person(firstName, lastName, dateOfBirth);
        }

    }

}