fourthclass.dart

void main() {
  Bird b = Bird();
  b.fly();

  Parrot p = Parrot();
  p.fly();
  p.speak();
  
  
  // Escaping String
  print('Your name is \'Naveen\$\' \\');
  
  String name = 'Parthiban';
  
  print(name.substring(0,6));
  
  // Task learn new 5 methods in string
  
  
  
}

class Bird {
  
  // constructor will be called whenever new object is created for the class
  // construtor
  Bird();
  
  // namedConstructor
  Bird.fromBird(){
    
  }
  
  void fly() {
    print("This can fly");
  }
}

// Use extends keyword to inherit a class.
class Parrot extends Bird {
  void speak() {
    print("This can speak");
  }
}