package com.ma.reflect;
import java.lang.reflect.Constructor;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
public class reflectTest6  {
    public static void main(String[] args) throws ClassNotFoundException, NoSuchFieldException {
        //反射
        Class c=Class.forName("com.ma.reflect.User");
        System.out.println("獲得包+類"+c.getName());//獲得包+類
        System.out.println("獲得類名"+c.getSimpleName());//獲得類名
        //獲得類的屬性
        System.out.println("-------------------------");
        Field[]   fields=c.getFields();//的到public類
        for (Field field : fields) {
            System.out.println("獲得類的Public 屬性"+field); }
        System.out.println("-------------------------");
        //獲得全部的類屬性
        Field[] f1=c.getDeclaredFields();
        for (Field field : f1) {
            System.out.println("獲得類的全部屬性"+field); }
        System.out.println("-------------------------");
        //獲得指定屬性的值
        Field name=c.getDeclaredField("age");
        System.out.println("獲得指定了屬性的類型"+name);
        System.out.println("-------------------------");
        //獲得指定方法的值
        Method[] methods=c.getMethods();
        System.out.println("獲得所有的public方法");
        for (Method method : methods) {
            System.out.println("public類有"+method); }
        Method[] methods1=c.getDeclaredMethods();
        System.out.println("獲得所有的public方法");
        for (Method method : methods1) {
            System.out.println("所有的方法="+method);
        }
        System.out.println("-------------------------");
       System.out.println("獲得所有的public構(gòu)造器");
        Constructor[] constructors=c.getConstructors();
        for (Constructor constructor : constructors) {
            System.out.println("public的構(gòu)造器"+constructor);
        }
        System.out.println("獲得所有的構(gòu)造器");
        Constructor[] constructors1=c.getDeclaredConstructors();
        for (Constructor constructor : constructors1) {
            System.out.println("所有的構(gòu)造器"+constructor);
        }
    }
}

Class user=Class.forName("com.ma.reflect.User");//獲得Class對(duì)象
//構(gòu)造對(duì)象
User user1=(User) user.newInstance();//無參方法
System.out.println(user1);
//通過構(gòu)造器 創(chuàng)建有參方法
Constructor constructor=user.getDeclaredConstructor(String.class,int.class,int.class);
User user2= (User) constructor.newInstance("myt",28,213);
System.out.println(user2);

Class user=Class.forName("com.ma.reflect.User");//獲得Class對(duì)象
User user3=(User) user.newInstance();
//通反射去獲取一個(gè)方法 
Method setName=user.getDeclaredMethod("setName", String.class);
//invoke激活 （對(duì)象，參數(shù)）
setName.invoke(user3,"myt");
System.out.println(user3.getName());

User user4=(User) user.newInstance();
Field name=user.getDeclaredField("name");//得到屬性
//***修改權(quán)限 去實(shí)現(xiàn)對(duì)私有屬性的修改 通過關(guān)閉程序的安全監(jiān)測(cè)
name.setAccessible(true);
name.set(user4,"tym"); //private的屬性無法直接去調(diào)用并且修改
System.out.println(user4.getName());

public class reflectTest8 {
    //普通方法調(diào)用
    public  static  void   test(){
        User user=new User();
        Long startTime=System.currentTimeMillis();
        for (int i = 0; i < 100000000; i++) {
            user.getName();
        }        
        Long endTime=System.currentTimeMillis();
        System.out.println("普通方法"+(endTime-startTime)+"ms");
    }
    //反射方法調(diào)用
    public static  void   test1() throws ClassNotFoundException, NoSuchMethodException, InvocationTargetException, IllegalAccessException {
        User user=new User();
        Class c=Class.forName("com.ma.reflect.User");
        Method getName=c.getDeclaredMethod("getName",null);
        Long startTime=System.currentTimeMillis();
        for (int i = 0; i < 100000000; i++) {
              getName.invoke(user,null);
        }
        Long endTime=System.currentTimeMillis();
        System.out.println("反射方法"+(endTime-startTime)+"ms");
    }
    //反射方法 關(guān)閉檢測(cè)調(diào)用
    public static   void   test2() throws ClassNotFoundException, NoSuchMethodException, InvocationTargetException, IllegalAccessException {
        User user=new User();
        Class c=Class.forName("com.ma.reflect.User");
        Method getName=c.getDeclaredMethod("getName",null);
        getName.setAccessible(true);
        Long startTime=System.currentTimeMillis();
        for (int i = 0; i < 100000000; i++) {
            getName.invoke(user,null);
        }
        Long endTime=System.currentTimeMillis();
        System.out.println("反射方法 關(guān)閉檢測(cè)"+(endTime-startTime)+"ms");
    }
    public static void main(String[] args) throws ClassNotFoundException, NoSuchMethodException, IllegalAccessException, InvocationTargetException {
        test();
        test1();
        test2();
    }
}