This implementation directly reflects what we have in the previous diagram. First, let's see what our Person class will look like:
class Person(builder: PersonBuilder) { val firstName = builder.firstName val lastName = builder.lastName val age = builder.age}
As we can see in the preceding code, it takes a builder and uses the values set in the builder for initialization of its fields. The builder code will look like the following:
class PersonBuilder { var firstName = "" var lastName = "" var age = 0 def setFirstName(firstName: String): PersonBuilder = { this.firstName = firstName this } def setLastName(lastName: String): PersonBuilder = { this.lastName = lastName this } def setAge(age: Int): PersonBuilder = {
