Java中创建一个包含抽象方法say()方法的抽象类

Question

创建一个包含抽象 方法say()方法的People抽象类，定义两个继承People类的子类
Teacher和Student类，并在
Teacher和Student类中重写say)方法，要求在测试类中调用Teacher的say()方法输
出“同学们好”，调用Student类say()方法输出“老师好”的内容。

Answer 1

public abstract class People {
    public abstract void say();
}

public class Student extends People{
    @Override
    public void say() {
        System.out.println("老师好");
    }
}

public class Teacher extends People{
    @Override
    public void say() {
        System.out.println("同学们好");
    }
}

public class Test {
    public static void main(String[] args){
        Teacher teacher=new Teacher();
        Student student=new Student();
        teacher.say();
        student.say();
    }
}