fascinating-dryad-3978

readme.md

fascinating-dryad-3978

Created with <3 with dartpad.dev.

main.dart

void main() {
  final Builder builder = StudentBuilder();
  builder.buildFirstName('Tấn');
  builder.buildLastName('Mobile');
  
  Student student = builder.build();
  print(student.toString());
}

abstract class Builder {
  Builder buildFirstName(String firstName);
  Builder buildLastName(String lastName);
  Student build();
}

class StudentBuilder implements Builder {
  late String firstName;
  late String lastName;

  @override
  Builder buildFirstName(String firstName) {
    this.firstName = firstName;
    return this;
  }

  @override
  Builder buildLastName(String lastName) {
    this.lastName = lastName;
    return this;
  }

  @override
  Student build() => Student(firstName, lastName);
}

class Student {
  final String lastName;
  final String firstName;

  const Student(this.firstName, this.lastName);
  
  @override
  String toString(){
    return '$lastName $firstName';
  }
}