java–多態理解

/*目的：理解多態的特點要求：子類：基礎班學員       學習、睡覺（坐著睡）   感激辦學員   學習、睡覺（躺著睡）可以將兩類事物進行抽取父類-學生類*/abstract class Student            //所抽取的學生父類{public abstract void study();public void sleep(){System.out.println("躺著睡");}}class BaseStudent extends Student   //繼承學生類{public void study(){System.out.println("base study");}public void sleep()              //對父類進行複寫{System.out.println("坐著睡");}}class AdvStudent extends Student{public void study(){System.out.println("adv study");}                                 //已經繼承了父類的sleep方法}class DoStudent                     //將測試資料封裝在一個dosome類中{public void doSome(Student stu){stu.study();stu.sleep();}}class duotaiDemo{public static void main(String[] args) {BaseStudent bs = new BaseStudent();bs.study();bs.sleep();AdvStudent as = new AdvStudent();as.study();as.sleep();DoStudent ds = new DoStudent();ds.doSome(new BaseStudent());ds.doSome(new AdvStudent());System.out.println("Hello World!");}}