定义一个抽象类：职业类,及其两个具体子类:工人\教师\ 然后创建一个工人对象，一个教师对象

abstract class Workers {
  String workName;
  String name;
  int age;

  abstract void saySth();
}

class Worker extends Workers {
  void saySth() {
    System.out.println("我是工人！");

  }
}

class Teacter extends Workers {
  void saySth() {
    System.out.println("我是教师！");
  }
}

public class T {
  public static void main(String[] args) {
    Workers worker = new Worker();
    Workers teacher = new Teacter();
  }
}