Flutter学习7 - Dart 泛型

1、泛型类

//泛型类
class Cache<T> {
   
  final Map<String, T> _cache = {
   };

  void saveData(String key, T value) {
   
    _cache[key] = value;
  }

  //泛型方法
  T? getData(String key) {
   
    return _cache[key];
  }
}

void main() {
   
  Cache<int> cache1 = Cache();
  const String name1 = "Leon";
  cache1.saveData(name1, 18);
  print("name: $name1   age: ${
     cache1.getData(name1)}"); //name: leon   age: 18