Get the structure of the class through reflection, little chestnut

 public static void main(String[] args) throws NoSuchFieldException, NoSuchMethodException {
        Class student = Student.class;

        // Get the name of the class 
        System.out.println(student.getName());// Get package name + Class name 
        System.out.println(student.getSimpleName());// Get the name of the class 

        System.out.println("----------------------------------");
        // Values obtained public attribute 
        for (Field field : student.getFields()) {
            System.out.println(field);
        }

        // Get all properties 
        for (Field declaredField : student.getDeclaredFields()) {
            System.out.println(declaredField);
        }

        Field id = student.getDeclaredField("id");
        System.out.println(id);

        System.out.println("---------------------------------");
        // Get all the methods of this class and its parents 
        for (Method method : student.getMethods()) {
            System.out.println("method "+method);
        }

        // Get all the methods of this class 
        for (Method declaredMethod : student.getDeclaredMethods()) {
            System.out.println(declaredMethod);
        }

        System.out.println("---------------------------------");
        // Get the specified method 
        Method getId = student.getMethod("getId", null);
        Method getAge = student.getMethod("getAge", null);
        Method setName = student.getMethod("setName", String.class);
        System.out.println(getId);
        System.out.println(getAge);
        System.out.println(setName);

        System.out.println("---------------------------------");
        // Get all the constructors 
        for (Constructor constructor : student.getConstructors()) {
            System.out.println(constructor);
        }

        for (Constructor declaredConstructor : student.getDeclaredConstructors()) {
            System.out.println(declaredConstructor);
        }
        // Get the specified constructor 
        Constructor declaredConstructor = student.getDeclaredConstructor(Integer.class, String.class, int.class);
        System.out.println(declaredConstructor);

    }