Student 类

package com.itheima.Myreflect3;

public class Student {
    private String name;
    private int age;

    public String gender;


    public Student() {
    }

    public Student(String name, int age, String gender) {
        this.name = name;
        this.age = age;
        this.gender = gender;
    }

    /**
     * 获取
     * @return name
     */
    public String getName() {
        return name;
    }

    /**
     * 设置
     * @param name
     */
    public void setName(String name) {
        this.name = name;
    }

    /**
     * 获取
     * @return age
     */
    public int getAge() {
        return age;
    }

    /**
     * 设置
     * @param age
     */
    public void setAge(int age) {
        this.age = age;
    }

    /**
     * 获取
     * @return gender
     */
    public String getGender() {
        return gender;
    }

    /**
     * 设置
     * @param gender
     */
    public void setGender(String gender) {
        this.gender = gender;
    }

    public String toString() {
        return "Student{name = " + name + ", age = " + age + ", gender = " + gender + "}";
    }
}

Reflect

package com.itheima.Myreflect3;

import java.lang.reflect.Field;

public class MyReflectDemo {
    public static void main(String[] args) throws ClassNotFoundException, NoSuchFieldException, IllegalAccessException {
        Class clazz = Class.forName("com.itheima.Myreflect3.Student");

        // 获取所有的成员变量
        /*Field[] fields = clazz.getDeclaredFields();
        for (Field field : fields) {
            System.out.println(field);
        }*/

        Field name = clazz.getDeclaredField("name");
        System.out.println(name);

        //获取权限修饰符
        int modifiers = name.getModifiers();
        System.out.println(modifiers);

        // 获取成员变量名
        String name1 = name.getName();
        System.out.println(name1);

        // 获取数据类型
        Class<?> type = name.getType();
        System.out.println(type);

        // 获取成员变量记录的值
        Student stu = new Student("zhangsan", 23, "男");
        name.setAccessible(true);
        String o = (String) name.get(stu);
        System.out.println(o);

        // 修改对象里面记录的值
        name.set(stu, "lisi");
        System.out.println(stu);
    }
}

笔记

大致思路就是 先获取到成员变量的对象 (先获取类的对象，在得到类中成员变量的对象)

Class clazz = Class.forName("com.itheima.Myreflect3.Student");
Field name = clazz.getDeclaredField("name");

然后用一系列方法对对象进行操作