如何构建在ListView.builder中使用的类的对象？

class ListItem {
  final String title;
  final String subtitle;

  ListItem({required this.title, required this.subtitle});
}

List<ListItem> items = [
  ListItem(title: 'Item 1', subtitle: 'Subtitle 1'),
  ListItem(title: 'Item 2', subtitle: 'Subtitle 2'),
  ListItem(title: 'Item 3', subtitle: 'Subtitle 3'),
];

ListView.builder(
  itemCount: items.length,
  itemBuilder: (context, index) {
    return ListTile(
      title: Text(items[index].title),
      subtitle: Text(items[index].subtitle),
    );
  },
)