获取类的运行时结构

package com.sean.reflection;

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

/**
 * 获得类的信息
 * @create 2021-03-04 14:39
 */
public class Demo08 {
    public static void main(String[] args)throws ClassNotFoundException ,NoSuchFieldException,NoSuchMethodException{
        Class c1 = Class.forName("com.sean.reflection.User");


        //获得类的名字
        System.out.println(c1.getName());//获得包名+类名
        System.out.println(c1.getSimpleName());//获得类名

        //获得类的属性
        System.out.println("================");
        Field[] fields = c1.getFields();//只能找到public属性

        fields = c1.getDeclaredFields();//找到全部的属性
        for (Field field : fields) {
            System.out.println(field);
        }

        //获得制定属性的值
        Field name=c1.getDeclaredField("name");
        System.out.println(name);

        //获得类的方法
        System.out.println("====================");
        Method[] methods = c1.getMethods();//获得本类及其父类的全部public方法
        for (Method method : methods) {
            System.out.println("正常的："+method);
        }
        methods = c1.getDeclaredMethods();//获得本类的所有方法
        for (Method method : methods) {
            System.out.println("getDeclaredMethods："+method);
        }

        //获得制定方法
        //重载
        Method getName = c1.getMethod("getName", null);
        Method setName = c1.getMethod("setName", String.class);
        System.out.println(getName);
        System.out.println(setName);

        //获得构造器的方法
        System.out.println("===============");
        Constructor[] constructors = c1.getConstructors();
        for (Constructor constructor : constructors) {
            System.out.println(constructor);
        }
        constructors=c1.getDeclaredConstructors();
        for (Constructor constructor : constructors) {
            System.out.println(constructor);
        }

        //获得指定的构造器
        Constructor declaredConstructor = c1.getDeclaredConstructor(String.class, int.class, int.class);
        System.out.println("指定："+declaredConstructor);

    }
    }