ObjectFactory2反射

package com.shrimpking.t6;

/**
 * Created by IntelliJ IDEA.
 *
 * @Author : Shrimpking
 * @create 2024/9/12 18:06
 */
public class Person
{
    private String name;

    public Person(){
        this("匿名构造");
    }

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

    public String getName()
    {
        return name;
    }

    public void setName(String name)
    {
        this.name = name;
    }

    public void run(int meters){
        System.out.printf("%s跑了%d米%n",this.name,meters);
    }

    @Override
    public String toString()
    {
        return "Person{" + "name='" + name + '\'' + '}';
    }

    private void helper(){
        System.out.println("私有辅助方法");
    }
}

package com.shrimpking.t6;

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

/**
 * Created by IntelliJ IDEA.
 *
 * @Author : Shrimpking
 * @create 2024/9/12 18:33
 */
public class ObjectFactory2
{
    public static void main(String[] args)
    {
        try
        {
            Class<?> clz = Class.forName("com.shrimpking.t6.Person");
            //获取一个参数的构造方法
            Constructor oneArgCons = clz.getConstructor(String.class);
            Object obj = oneArgCons.newInstance("zhang");
            //获取 run方法的对象
            Method method = clz.getMethod("run", int.class);
            //调用run
            method.invoke(obj,1000);

            //获取helper 方法的对象
            method = clz.getDeclaredMethod("helper");
            //helper方法是私有方法，正常时不可调用
            // 通过设置可见性 ，来访问
            method.setAccessible(true);
            method.invoke(obj);

        }catch (Exception e){
            System.out.println(e.getMessage());
        }
    }
}