01.反射01

package com.qq.oop;

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

public class yongFanShe {
    public static void main(String[] args) throws ClassNotFoundException, IllegalAccessException, InstantiationException, InvocationTargetException, NoSuchMethodException {
        Class c1 = Class.forName("com.qq.oop.teacher");
        //怎么用 反射得到的这个c1 用方法,属性,构造方法呢>>>>>

        //1.先总的搞个new一样的东西出来吧

        //这是第一种,无参构造方法,造个对象
//        Object bb = c1.newInstance();
//       // bb=(teacher)bb;
//        System.out.println(((teacher) bb).age);
//        ((teacher) bb).setAge(100);
//        System.out.println(((teacher) bb).age);
        //有参怎么造呢?
       // Object wo = c1.newInstance(int.class,String.class);    这样搞好像不行
        //通过得到构造器搞
//        Constructor dc = c1.getDeclaredConstructor(int.class);
//        teacher nihoa =(teacher) dc.newInstance(999);
//        System.out.println(nihoa);

        //通过反射 用方法
        teacher t1 =(teacher) c1.newInstance();
//        t1.setAge(10);
//        System.out.println(t1.getAge());           这样就可以调用方法了,还搞什么
        Method getAge = c1.getDeclaredMethod("setAge",int.class);
        getAge.invoke(t1,1000);
        System.out.println(t1.getAge());
    }
}
class teacher{
    int age=10;

    public int getAge() {
        return age;
    }

    public void setAge(int age) {
        this.age = age;
    }

    public teacher() {
    }

    public teacher(int age) {
        this.age = age;
    }
}