摘要: 向上向下转型的一些思考 public boolean equals(Object obj) { if (this == obj){ return true; } if (!(obj instanceof Doctor)){ return false; } Doctor doctor = (Docto 阅读全文
posted @ 2022-07-12 22:41 AINIBYM 阅读(34) 评论(0) 推荐(0)