java基础案例4-4学生和老师「建议收藏」 packagecom.itheima;importjava.util.Scanner;abstractclassPerson{voidspeak(){}}classTeacherextendsPerson{privateString name;voidsetName(String name){this.name=name;}StringgetName(){returnname;}voidspeak(){System.out.println("这道题怎么写");}}classStudentextends...