153.-反射-获取Field对象__

最新推荐文章于 2025-02-14 19:57:14 发布

原创最新推荐文章于 2025-02-14 19:57:14 发布 · 353 阅读

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这篇博客主要介绍了Java反射机制的应用，通过`Class.forName()`加载类并获取其`Field`对象，展示了如何访问类的声明字段，包括私有字段。作者分别演示了获取单个字段、所有声明字段以及公开字段的方法，为理解Java反射提供了实例。

package com.itheima.myreffect3;

import java.lang.reflect.Field;

public class ReflectDemo1 {
    public static void main(String[] args) throws ClassNotFoundException, NoSuchFieldException {
        //mehtod1();
       // method2();
       // method3();
        Class clazz = Class.forName("com.itheima.myreffect3.Student");
        Field declaredField = clazz.getDeclaredField("money");
        System.out.println(declaredField);
    }

    private static void method3() throws ClassNotFoundException, NoSuchFieldException {
        Class clazz = Class.forName("com.itheima.myreffect3.Student");
        Field field = clazz.getField("name");
        System.out.println(field);
    }

    private static void method2() throws ClassNotFoundException {
        Class clazz = Class.forName("com.itheima.myreffect3.Student");
        Field[] declaredFields = clazz.getDeclaredFields();
        for (Field declaredField : declaredFields) {
            System.out.println(declaredField);
        }
    }

    private static void mehtod1() throws ClassNotFoundException {
        Class clazz = Class.forName("com.itheima.myreffect3.Student");
        Field[] fields = clazz.getFields();
        for (Field field : fields) {
            System.out.println(field);
        }
    }
}

package com.itheima.myreffect3;

public class Student {
    public String name;
    public int age;
    public String gernder;
    private int money=300;
}