类Teacher和Student是类Person的子类Person p; Teacher t; Student s; //p,t and s are all non-null.if(t instanceof Person) { s = (Student)t; } 最后一句语句的结果是：A、 将构造一个Student对象； B、 表达式是合法的； C、

类Teacher和Student是类Person的子类Person p; Teacher t; Student s; //p,t and s are all non-null.if(t instanceof Person) { s = (Student)t; } 最后一句语句的结果是：A、 将构造一个Student对象； B、 表达式是合法的； C、 student &s和student s有啥区别student是一个类 ,有一个函数接收student &s和student s,那这两个的区别是什么?引用地址和引用对象有啥区别? student and teacher teacher and student是什么意思 student and teacher the teacher asked the student about f____知道了 是fashion 选择疑问句 他是老师还是学生?这题我知道答案是是Is he a teacher or a student?但我想知道后面的a能省去不?就当并列的部分是teacher和student,而不是a teacher 和a student. student和boy属于哪一类 英文 在Java中,有两个类Student和Person.如果Student是Person的子类,则下列声明对象x的语句中错误的是( ).(选择一项)a) Person x = new Student();b) Person x = new Person();c) Student x = new Person();d) Student x = new Student(); the student's teacher和the students' teacher有什么区别 student,boy是属于什么类的? every student 是单数还是负数?each student呢书上说Each student will have their own online teacher.为什么这里student不加s,又说their呢? like teacher,like student是什么意思 the teacher gave( )student a new book.有两个选项any和each 我认为any肯定句中的用法适用于本句,可以吗答案是each a good teacher is one who can motivate his student.和 a good teacher can motivate his student.有啥区别 c++,假如有一个student类,和一个name类,在name类用includestudent.h和公有继承student类有什么不同 She is not a student.She is a teacher.不好意思，弄错了是合并成一句的She is_____a student_____a teacher. 2130201:due to the high pressure of the rate of students and student's physical fitness is in deficiency,the knowledge of PE teacher's is out of date.想知道的语言点：1—句尾的the knowledge of PE teacher's is out of date：为什么teacher