教室、老师和学生

public class ClassRoom {
public static void main(String args[]) {

System.out.println("教学活动从教室开始");
Teacher zhang = new Teacher();
Student jiang = new Student();
zhang.introduceSelf();
jiang.introduceSelf();

}
}
class Teacher {
void introduceSelf() {

System.out.println("我是张老师");
}
}
class Student {
void introduceSelf() {
//【代码3】
System.out.println("我是学生,名字是:奖励");
}
}