反射_获取构造器结构\运行时类的父类\运行时类的接口\所在包\注解

package com.zhou.java2;

import com.zhou.java1.Person;
import org.junit.jupiter.api.Test;

import java.lang.annotation.Annotation;
import java.lang.reflect.Constructor;
import java.lang.reflect.ParameterizedType;
import java.lang.reflect.Type;

/**
 * @author upzhou
 * @create 2022-04-02 16:43
 */
public class OtherTest {
    /*
    获取构造器结构
     */
    @Test
    public void test1() {

        Class clazz = Person.class;

        //getConstructors(): 获取当前运行时类中声明为 public 的构造器
        for (Constructor c : clazz.getConstructors()) {
            System.out.println(c);
        }

        System.out.println();

        //getDeclaredConstructors():获取当前运行时类中声明的所有的构造器
        for (Constructor c : clazz.getDeclaredConstructors()) {
            System.out.println(c);
        }
    }

    /*
    运行时类的父类
     */
    @Test
    public void test2() {
        Class clazz = Person.class;

        Class superclass = clazz.getSuperclass();
        System.out.println(superclass);
    }

    /*
    运行时类的带泛型的父类
     */
    @Test
    public void test3() {
        Class clazz = Person.class;

        Type genericSuperclass = clazz.getGenericSuperclass();
        ParameterizedType paramType = (ParameterizedType) genericSuperclass;
        //获取泛型类型
        Type[] actualTypeArguments = paramType.getActualTypeArguments();
        System.out.println(((Class)actualTypeArguments[0]).getName());
    }
    /*
    获取运行时类的接口
     */
    @Test
    public void test5(){
        Class clazz = Person.class;

        for (Class c : clazz.getInterfaces()) {
            System.out.println(c);
        }
        System.out.println();

        //获取运行时类的父类实现的接口
        for (Class c : clazz.getSuperclass().getInterfaces()) {
            System.out.println(c);
        }
    }
    /*
    获取运行时类所在的包
     */
    @Test
    public void test6(){
        Class clazz = Person.class;

        Package pack = clazz.getPackage();
        System.out.println(pack);
    }
    /*
    获取运行时类声明的注解
     */
    @Test
    public void test7(){
        Class clazz = Person.class;

        for (Annotation annos : clazz.getAnnotations()) {
            System.out.println(annos);

        }
    }
}