反射筆記（三）

獲取構造器並創建對象

Constructor[] constructors = clazz.getConstructors();
Constructor constructor = clazz.getConstructor();
Constructor[] declaredConstructors = clazz.getDeclaredConstructors();
Constructor declaredConstructor = clazz.getDeclaredConstructor();

Object obj = constructor.newInstance();

註解

//元註解 要加上runtime
//類上
Annotation annotation = clazz.getAnnotation(Bean.class);
Annotation[] annotations = clazz.getAnnotations();

//字段上
Annotation annotation = field.getAnnotation(Bean.class);
Annotation[] annotations = field.getAnnotations();

//方法上
Annotation annotation = method.getAnnotation(Bean.class);
Annotation[] annotations = method.getAnnotations();