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FieldDemo.java
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48 lines (42 loc) · 1.62 KB
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/**
* @program JavaBooks
* @description: FieldDemo
* @author: mf
* @create: 2020/02/09 20:08
*/
package com.reflect;
import java.lang.reflect.Field;
public class FieldDemo {
public static void main(String[] args) throws Exception {
// 1. 获取class对象
Class clazz = Class.forName("com.reflect.Student");
// 2. 获取所有字段
System.out.println("************获取所有公有的字段********************");
Field[] fields = clazz.getFields();
for (Field field : fields) {
System.out.println(field);
}
//
System.out.println("************获取所有的字段(包括私有、受保护、默认的)********************");
Field[] fields1 = clazz.getDeclaredFields();
for (Field field : fields1) {
System.out.println(field);
}
//
System.out.println("*************获取公有字段**并调用***********************************");
Field gender = clazz.getField("gender");
System.out.println(gender);
// 获取一个对象
Object o = clazz.getConstructor().newInstance();
gender.set(o, "男");
Student stu = (Student) o;
System.out.println("验证性别：" + stu.getGender());
//
System.out.println("*************获取公有字段**并调用***********************************");
Field name = clazz.getDeclaredField("name");
System.out.println(name);
name.setAccessible(true); //暴力反射，解除私有限定
name.set(o, "买");
System.out.println("验证姓名：" + stu);
}
}