java反射

个人觉得java反射的意义在于setAccessible，这样可以读到，修改private属性的东西。又感觉破坏了原有的封装特点。不知道对不对，欢迎指正。

 

package com.annotation;

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

public class NameDemo {
    
    public static void main(String[] args) throws Exception {
        Class clazz = Class.forName("com.annotation.Name");
        Constructor con = clazz.getConstructor(new Class[]{
                String.class, String.class
        });
        Name christy = (Name) con.newInstance("Christy","Guo");
        System.out.println(christy.getFirstName() + " " + christy.getLastName());
        
        Field[] fields = clazz.getDeclaredFields();
        for(int i = 0 ; i <fields.length; i ++){
            System.out.println(fields[i].getName() + " Accessible: " + fields[i].isAccessible());
        }
        
        Method[] methods = clazz.getMethods();
        for(int i = 0 ; i <methods.length; i ++){
            System.out.println(methods[i].getName()+ " Accessible: " + methods[i].isAccessible());
        }
        
        
        Field field = clazz.getDeclaredField("firstName");
        if(!field.isAccessible()){
            field.setAccessible(true);
            field.set(christy, "Ruth");
        }
        
        Method method = clazz.getDeclaredMethod("setLastName", new Class[]{String.class});
        method.invoke(christy, "Guoo");
        
        System.out.println(christy.getFirstName() + " " + christy.getLastName());
    }

}