public class ObjectProviderDemo { // @Configuration 是非必須注解public static void main(String[] args) {// 創建 BeanFactory 容器AnnotationConfigApplicationContext applicationContext = new AnnotationConfigApplicationContext();// 將當前類 ObjectProviderDemo 作為配置類（Configuration Class）applicationContext.register(ObjectProviderDemo.class);// 啟動應用上下文applicationContext.refresh();// 依賴查找集合對象lookupByObjectProvider(applicationContext);lookupIfAvailable(applicationContext);lookupByStreamOps(applicationContext);// 關閉應用上下文applicationContext.close();}private static void lookupByStreamOps(AnnotationConfigApplicationContext applicationContext) {ObjectProvider<String> objectProvider = applicationContext.getBeanProvider(String.class); // Iterable<String> stringIterable = objectProvider; // for (String string : stringIterable) { // System.out.println(string); // }// Stream -> Method referenceobjectProvider.stream().forEach(System.out::println);}private static void lookupIfAvailable(AnnotationConfigApplicationContext applicationContext) {ObjectProvider<User> userObjectProvider = applicationContext.getBeanProvider(User.class);User user = userObjectProvider.getIfAvailable(User::createUser);System.out.println("當前 User 對象：" + user);}@Bean@Primarypublic String helloWorld() { // 方法名就是 Bean 名稱 = "helloWorld"return "Hello,World";}@Beanpublic String message() {return "Message";}private static void lookupByObjectProvider(AnnotationConfigApplicationContext applicationContext) {ObjectProvider<String> objectProvider = applicationContext.getBeanProvider(String.class);System.out.println(objectProvider.getObject());} }

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