Two references point to the same heap memory

Phone类
package com.itheima_03;
/*
 * 手机类
 */
public class Phone {
    String brand;
    int price;
    String color;
    
    public void call(String name) {
        System.out.println("给"+name+"打电话");
    }
    
    public void sendMessage() {
        System.out.println("群发短信");
    }
}

Phone的测试类：
package com.itheima_03;
/*
 * 手机类的测试类
 */
public class PhoneDemo3 {
    public static void main(String[] args) {
        Phone p = new Phone();
        p.brand = "OPPO";
        p.price = 2999;
        p.color = "白色";
        System.out.println(p.brand+"---"+p.price+"---"+p.color);
        
        Phone p2 = p;
        p2.brand = "魅族";
        p2.price = 1999;
        p2.color = "蓝色";
        System.out.println(p.brand+"---"+p.price+"---"+p.color);
        System.out.println(p2.brand+"---"+p2.price+"---"+p2.color);
    }
}