已知Main类、Person类的设计，完成Student类，Teacher类、MyTool类的设计。

函数接口定义：

class Student extends Person{}
class Teacher extends Person{}
class MyTool{
	public static void separateStu_T(List persons,List teachers,List students){}
}

Student类继承了Person，拥有私有属性int类型的sno和String类型的major，分别代表学号与所学专业；提供对应的set，get方法；比较方法完成按照学号比较。
Teacher类继承了Person，拥有私有属性int类型的tno和String类型的subject，分别代表教师编号与所授科目；提供对应的set，get方法；比较方法完成按年龄比较。
MyTool类中提供方法public static void separateStu_T(List persons,List teachers,List students){}，方法 separateStu_T的功能是将persons线性表中的 teacher，student分别放到teachers,students两个线性表中。

裁判测试程序样例：

import java.util.*;

public class Main {

    public static void main(String[] args) {
     List persons=getPersons();  //得到一个所有人的线性表
        List teachers=new ArrayList();
        List students=new ArrayList();
        MyTool.separateStu_T( persons,teachers,students); //将persons线性表中的 teacher，student分别放到teachers,students两个线性表中
        Collections.sort(teachers);  //对教师线性表排序
        Collections.sort(students);  //对学生线性表排序
        showResult(teachers);  //显示教师线性表排序以后的结果
        showResult(students);  //显示学生线性表排序以后的结果
    }
    
    public static List getPersons(){
        List persons=new ArrayList();
        Scanner in=new Scanner(System.in);
        Person person=null;
        int num=Integer.parseInt(in.nextLine());
        for(int i=0;i<num;i++){
            String str=in.nextLine();
            String []data=str.split(",");
            if(data[0].equalsIgnoreCase("student"))
                 person=new Student(Integer.parseInt(data[1]),data[2],data[3],Integer.parseInt(data[4]),data[5]);
            else if (data[0].equalsIgnoreCase("teacher"))
                  person=new Teacher(Integer.parseInt(data[1]),data[2],data[3],Integer.parseInt(data[4]),data[5]);
            else person=null;
                 persons.add(person);
        }
        return persons;
    }
    
    public static void showResult(List persons){
        for(int i=0;i<persons.size();i++){
            Person per=(Person)persons.get(i);
            System.out.println(per.getName()+","+per.getGender()+","+per.getAge());
        }
    }
    
}

abstract class Person  implements Comparable{
    private String name;
    private String gender;
    private int age;
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public String getGender() {
        return gender;
    }
    public void setGender(String gender) {
        this.gender = gender;
    }
    public int getAge() {
        return age;
    }
    public void setAge(int age) {
        this.age = age;
    }
    public Person(String name, String gender, int age) {
        super();
        this.name = name;
        this.gender = gender;
        this.age = age;
    }
}

/* 请在这里写你的代码 */

输入样例：

输入的第一行是总人数n，紧跟着输入n行，每一行代表一个人的信息。下面的例子中n=5，输入了5个人的信息。

5
student,1001,Tom1,female,18,computer
teacher,2001,Jake1,female,35,datastructer
student,1002,Tom2,male,19,computer
student,1003,Tom3,female,20,software
teacher,2002,Jake2,female,33,database

输出样例：

注意：本样例输出结果中两名教师是按照年龄升序排序的，三名学生是按照学号降序排序的。

Jake2,female,33
Jake1,female,35
Tom3,female,20
Tom2,male,19
Tom1,female,18

AC代码：

class Student extends Person{
	private int sno;
	private String major;
	public Student(int sno, String name, String gender, int age, String major) {
		super(name, gender, age);
		this.sno = sno;
		this.major = major;
	}
	public int getSno() {
		return sno;
	}
	public void setSno(int sno) {
		this.sno = sno;
	}
	public String getMajor() {
		return major;
	}
	public void setMajor(String major) {
		this.major = major;
	}
    @Override
    public int compareTo(Object o) { //对象内部实现Comparable接口
        // TODO Auto-generated method stub
        Student s=(Student)o;
        return -(sno-s.sno);
    }
}
//class students implements Comparator<Student>{ //重定义比较器，实现Comparator接口
//    @Override
//    public int compare(Student o1, Student o2) {
//    	// TODO Auto-generated method stub
//    	return -(o1.getSno()-o2.getSno());
//    }
//}
class Teacher extends Person{
	private int tno;
	private String subject;
	public Teacher(int tno, String name, String gender, int age, String subject) {
		super(name, gender, age);
		this.tno = tno;
		this.subject = subject;
	}
	public int getTno() {
		return tno;
	}
	public void setTno(int tno) {
		this.tno = tno;
	}
	public String getSubject() {
		return subject;
	}
	public void setSubject(String subject) {
		this.subject = subject;
	}
    @Override
    public int compareTo(Object o) { //对象内部实现Comparable接口
        // TODO Auto-generated method stub
        Teacher t=(Teacher)o;
        return this.getAge()-t.getAge();
    }
}
//class teachers implements Comparator<Teacher>{ //重定义比较器，实现Comparator接口
//	@Override
//	public int compare(Teacher o1, Teacher o2) {
//		// TODO Auto-generated method stub
//		return o1.getAge()-o2.getAge();
//	}
//}
class MyTool{
	public static void separateStu_T(List persons,List teachers,List students){
		for (int i=0;i<persons.size();i++) {
			if(persons.get(i) instanceof Teacher) {
				teachers.add((Teacher)(persons.get(i)));
			}
			else {
				students.add((Student)(persons.get(i)));
			}
		}
	}
}