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重点！！！
package com.guo.reflection;import java.lang.reflect.Constructor;
import java.lang.reflect.Field;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;//通过反射，动态的创建对象
public class Test09 {public static void main(String[] args) throws ClassNotFoundException, InstantiationException, IllegalAccessException, NoSuchMethodException, InvocationTargetException, NoSuchFieldException {//获得Class对象Class c1 = Class.forName("com.guo.reflection.User");/* //构造一个对象User user1 = (User) c1.newInstance(); //本质上是调用了类的无参构造器System.out.println(user1);System.out.println("===========================");//通过构造器创建对象Constructor constructor = c1.getDeclaredConstructor(String.class, int.class, int.class);User user2 = (User) constructor.newInstance("陈果", 001, 18);System.out.println(user2);*///通过反射调用普通方法User user3 = (User) c1.newInstance();
/* user3.setName("李悦");String name = user3.getName();System.out.println(name);*///通过反射获取一个方法Method setName = c1.getDeclaredMethod("setName", String.class);//invoke : 激活的意思//(对象，"方法的值")setName.invoke(user3,"陈果");System.out.println(user3.getName());System.out.println("==========================");//通过反射操作属性User user4 = (User) c1.newInstance();
/* user4.setName("美丽的李悦");System.out.println(user4.getName());*/Field name = c1.getDeclaredField("name");//不能直接操作私有属性，需要关闭程序的安全检测，属性或者方法的 .setAccessible(true);name.setAccessible(true); //关闭程序的安全检测name.set(user4,"帅气的陈果");System.out.println(user4.getName());}
}