JAVA编程：有五个学生,每个学生有3门课（语文、数学、英语）的成绩,写一个程序接收从键盘输入学生的信息,输入格式为：name,30,30,30（姓名,三门课成绩）,然后把输入的学生信息按总分从高
JAVA编程：有五个学生,每个学生有3门课（语文、数学、英语）的成绩,
写一个程序接收从键盘输入学生的信息,输入格式为：name,30,30,30（姓名,三门课成绩）,然后把输入的学生信息按总分从高到低的顺序写入到一个名称"stu.txt"文件中.要求：stu.txt文件的格式要比较直观,打开这个文件,就可以很清楚的看到学生的信息.多加点注释,
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.util.Collections;
import java.util.Comparator;
import java.util.LinkedList;
import java.util.Scanner;
public class Student
{
x09double chinese;
x09double math;
x09double english;
x09double sum;
x09String sname;
x09public Student ( double chinese, double math, double english, double sum, String sname )
x09{
x09x09this.chinese = chinese;
x09x09this.math = math;
x09x09this.english = english;
x09x09this.sum = sum;
x09x09this.sname = sname;
x09}
x09@Override
x09public String toString ()
x09{
x09x09return String.format ("%stt%2$.1fttt%3$.1fttt%4$.1fttt%5$.1f", sname, chinese, math, english, sum);
x09}
x09public static void main ( String[] args )
x09{
x09x09Scanner scanner = new Scanner (System.in);
x09x09LinkedList<Student> list = new LinkedList<Student> ();
x09x09System.out.println ("从键盘输入学生的信息,输入格式为：name,30,30,30（姓名,三门课成绩）<直接回车结束>");
x09x09while (scanner.hasNextLine ())
x09x09{
x09x09x09String line = scanner.nextLine ().trim ();
x09x09x09if ("".equals (line))
x09x09x09{
x09x09x09x09break;
x09x09x09}
x09x09x09String[] info = line.split (",");
x09x09x09String name = info[0];
x09x09x09double chinese = 0;
x09x09x09double math = 0;
x09x09x09double english = 0;
x09x09x09double sum = 0;
x09x09x09try
x09x09x09{
x09x09x09x09chinese = Double.parseDouble (info[1]);
x09x09x09x09math = Double.parseDouble (info[2]);
x09x09x09x09english = Double.parseDouble (info[3]);
x09x09x09x09sum = chinese + math + english;
x09x09x09}
x09x09x09catch (Exception e)
x09x09x09{
x09x09x09x09System.out.println ("格式不正确,重写输入：");
x09x09x09x09continue;
x09x09x09}
x09x09x09Student student = new Student (chinese, math, english, sum, name);
x09x09x09list.add (student);
x09x09}
x09x09scanner.close ();
x09x09Collections.sort (list, new Comparator<Student> ()
x09x09{
x09x09x09@Override
x09x09x09public int compare ( Student o1, Student o2 )
x09x09x09{
x09x09x09x09if (o1.sum > o2.sum)
x09x09x09x09{
x09x09x09x09x09return -1;
x09x09x09x09}
x09x09x09x09else if (o1.sum < o2.sum)
x09x09x09x09{
x09x09x09x09x09return 1;
x09x09x09x09}
x09x09x09x09else
x09x09x09x09{
x09x09x09x09x09return 0;
x09x09x09x09}
x09x09x09}
x09x09});