反射_获取当前运行时类的属性结构

package com.zhou.java2;

import com.zhou.java1.Person;
import org.junit.jupiter.api.Test;

import java.lang.reflect.Field;

/**
 * 获取当前运行时类的属性结构
 *
 * @author upzhou
 * @create 2022-04-02 14:40
 */
public class FieldTest {
    @Test
    public void test1(){

        Class clazz = Person.class;

        //获取属性结构
        //getFields(): 获取当前运行时类及其父类中声明为 public 访问权限的属性
        Field[] fields = clazz.getFields();
        for (Field f : fields){
            System.out.println(f);  //public int com.zhou.java1.Person.id
                                    //public double com.zhou.java1.Creature.weight
        }

        System.out.println();
        //getDeclaredFields(): 获取当前运行时类当中声明的所有属性(不包含父类中声明的属性)
        Field[] declaredFields = clazz.getDeclaredFields();
        for (Field f : declaredFields){
            System.out.println(f);  //private java.lang.String com.zhou.java1.Person.name
                                    //int com.zhou.java1.Person.age
                                    //public int com.zhou.java1.Person.id
        }
    }

    //权限修饰符  数据类型  变量名
    @Test
    public void test2(){
        Class<Person> clazz = Person.class;
        Field[] declaredFields = clazz.getDeclaredFields();
        for (Field f : declaredFields){
            //1.权限修饰符
            int modifiers = f.getModifiers();
            System.out.println(modifiers + "\t");

            //2.数据类型
            Class type = f.getType();
            System.out.println(type.getName() + "\t");

            //3.变量名
            String fName = f.getName();
            System.out.println(fName);

            System.out.println();
        }
    }
}