JAVA概念No6——面向对象的三个基本特征 面向对象的三个基本特征 https://blog.csdn.net/baidu_33714003/article/details/52290627 多态实例: 转自: https://www.cnblogs.com/1693977889zz/p/8296595.html https://www.cnblogs.com/1693977889zz/p/8296595.html