录入5名学生成绩 按总分排序

package com.heima.test;import java.io.FileWriter;import java.io.IOException;import java.util.Comparator;import java.util.Scanner;import java.util.TreeSet;public class Test12 {    /**录入5名学生成绩  按总分排序     * @param args     * @throws IOException      */    public static void main(String[] args) throws IOException {        FileWriter file = new FileWriter("stu.txt");        TreeSet<Student> ts = new TreeSet<Student>(new Comparator<Student>() {            @Override            public int compare(Student o1, Student o2) {                int num = o2.getSum() - o1.getSum();                return num == 0? 1: num;            }        });        Scanner sc = new Scanner(System.in);        System.out.println("输入5个学生的成绩（格式：名字,语文,数学,英语）： ");        while(ts.size() < 5){            try{                String line = sc.nextLine();                String arr[] = line.split(",");                int chinese = Integer.parseInt(arr[1]);                int math = Integer.parseInt(arr[2]);                int english = Integer.parseInt(arr[3]);                ts.add(new Student(arr[0],chinese,math,english));            }catch (Exception e) {                // TODO: handle exception                System.out.println("输入格式有误！请重输：");            }        }        System.out.println(ts);        for (Student student : ts) {            file.write(student.toString() + "\n");        }        file.close();    }}