package com.imooc.reflect.project;

public class Book {

    //私有属性：图书编号、图书名称；公有属性：图书价格
    private Integer id;        //图书编号
    private String name;    //图书名称
    public double price;    //图书价格

    //无参构造及带参构造
    public Book(Integer id, String name, double price) {
        super();
        this.id = id;
        this.name = name;
        this.price = price;
    }

    public Book() {
        super();
    }

    //toString()方法
    @Override
    public String toString() {
        return "Book [id=" + id + ", name=" + name + ", price=" + price + "]";
    }

    //没有get和set方法

}

​package com.imooc.reflect.project;

import java.lang.reflect.Field;

import org.junit.Test;

public class FieldTest {

    //通过Field获得图书名称属性，为图书名称设置新值并输出
    @Test
    public void demo1() throws Exception {
        Class clazz=Class.forName("com.imooc.reflect.project.Book");
        Field nameField=clazz.getDeclaredField("name");
        nameField.setAccessible(true);
        Book book=(Book)clazz.newInstance();
        nameField.set(book, "流浪苍穹");
        System.out.println(nameField.get(book));
        System.out.println(book);
    }

    //通过Field获得图书价格属性，为图书价格设置新值并输出
    @Test
    public void demo2() throws Exception {
        Class clazz=Class.forName("com.imooc.reflect.project.Book");
        Field priceField=clazz.getField("price");
        Book book=(Book) clazz.newInstance();
        priceField.set(book, 39.9);
        System.out.println(priceField.get(book));
        System.out.println(book);
    }
}