bigbany

void main(){
  
  Lecture<String> lecture1 = Lecture('123','lecture1');
  
  lecture1.printIdType();
}

// generic - 타입을 외부에서 받을때 사용

bigbany

void main(){
  
  BoyGroup bts = BoyGroup('BTS');
  print(bts is IdolInterface);
}

abstract class IdolInterface{
  
  String name;
  

bigbany

void main(){
  
  TimesTwo tt = TimesTwo(2);
  print(tt.calculate());
  
  TimesFour tf = TimesFour(2);
  print(tf.calculate());
  
}