public static void main(String[] args) {
ExtensionLoader<Car> extensionLoader = ExtensionLoader.getExtensionLoader(Car.class);
// 演示 扩展的获得、关联扩展点的注入（Car扩展点引用了Wheel）
Car defaultCar = extensionLoader.getDefaultExtension();
defaultCar.run();
System.out.println("=================================");
Car car1 = extensionLoader.getExtension("racing");
car1.run();
System.out.println("=================================");
Car car2 = extensionLoader.getExtension("sport", Utils.kv2Map(Wheel.class.getName(), "wood"));
car2.run(); // 缺省使用RubberWheel
System.out.println("=================================");
Car car3 = extensionLoader.getExtension(Utils.kv2Map(Car.class.getName(), "racing", Wheel.class.getName(), "wood"));
car3.run(); // 缺省使用RubberWheel
// 演示 Wrapper的使用
System.out.println("=================================");
Car countedSportCar1 = extensionLoader.getExtension("sport", Arrays.asList("run_counter"));
Car countedSportCar2 = extensionLoader.getExtension("sport", Arrays.asList("run_counter"));
countedSportCar1.run();
countedSportCar2.run();
countedSportCar1.run();
}