gyugyu90 · October 20, 2024 01:38
diff --git a/headphone_polymorphism_2.dart b/headphone_polymorphism_2.dart
 void main() {
  var headphones = [
    BluetoothHeadphone(),
    Headphone(),
    NoiseCancellingHeadphone()
  ];

  headphones.forEach((headphone) {
    headphone.decreaseVolume();
    print(headphone.volume); // 4.5, 4.0, 4.8
  });
 }
	void main() {
	var headphones = [
	BluetoothHeadphone(),
	Headphone(),
	NoiseCancellingHeadphone()
	];

	headphones.forEach((headphone) {
	headphone.decreaseVolume();
	print(headphone.volume); // 4.5, 4.0, 4.8
	});
	}