Java 리플렉션 메커니즘은 클래스 메소드와 멤버 변수를 어떻게 얻습니까?

Class<?> clazz = MyClass.class;
Method[] methods = clazz.getMethods();

Method[] getDeclaredMethods = clazz.getDeclaredMethods();
Method[] getPublicMethods = clazz.getMethods();

Method method = clazz.getMethod("myMethod");
Class<?>[] parameterTypes = method.getParameterTypes();
Class<?> returnType = method.getReturnType();

Annotation[] annotations = method.getAnnotations();
Annotation annotation = method.getAnnotation(MyAnnotation.class);

Field[] fields = clazz.getFields();

Field[] getDeclaredFields = clazz.getDeclaredFields();
Field[] getPublicFields = clazz.getFields();

Field field = clazz.getField("myField");
Object value = field.get(myObject);

import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.lang.reflect.Modifier;

public class Main {

    public static void main(String[] args) {
        Class<?> clazz = Person.class;

        // 获取类的方法
        for (Method method : clazz.getMethods()) {
            System.out.println("Method: " + method.getName());
            System.out.println("Modifiers: " + Modifier.toString(method.getModifiers()));

            // 获取方法参数和返回值类型
            System.out.println("Parameters:");
            for (Class<?> parameterType : method.getParameterTypes()) {
                System.out.println("  - " + parameterType.getName());
            }
            System.out.println("Return type: " + method.getReturnType().getName());

            // 获取方法注解
            for (Annotation annotation : method.getAnnotations()) {
                System.out.println("Annotation: " + annotation.annotationType().getName());
            }
            System.out.println();
        }

        // 获取类的成员变量
        for (Field field : clazz.getDeclaredFields()) {
            System.out.println("Field: " + field.getName());
            System.out.println("Modifiers: " + Modifier.toString(field.getModifiers()));
            System.out.println("Type: " + field.getType().getName());
            System.out.println();
        }
    }
}

class Person {

    private String name;
    private int age;

    public Person(String name, int age) {
        this.name = name;
        this.age = age;
    }

    @Override
    public String toString() {
        return "Person [name=" + name + ", age=" + age + "]";
    }
}