package Fanshe;

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

//需求：通過反射實現操作
//Student s=new Student()
//s.name="林青霞";
//s.age=30; sout。。。。。。
public class Fanshedeom4 {
    public static void main(String[] args) throws ClassNotFoundException, NoSuchFieldException, NoSuchMethodException, InvocationTargetException, InstantiationException, IllegalAccessException {
        //得到class物件
        Class<?> clss = Class.forName("Fanshe.Student");
        //獲取所以成員變數,遍歷
        Field[] allfields = clss.getDeclaredFields();
        for (Field allfield : allfields) {
            System.out.println(allfield);
        }
        //得到成員變數
        Field name = clss.getDeclaredField("name");
        Field age = clss.getDeclaredField("age");
        //獲取無參構造
        Constructor<?> stu = clss.getConstructor();
        //建立物件
        Object obj = stu.newInstance(); 
        name.set(obj,"林青霞");
        // age為私有變數，使用時需要使用暴力反射
        age.setAccessible(true);
        age.set(obj,20);
        System.out.println(obj);

    }
}