package cn.itcast_06;

 public class Student {

     // 姓名

     private String name;

     // 语文成绩

     private int chinese;

     // 数学成绩

     private int math;

     // 英语成绩

     private int english;

     public Student() {

         super();

     }

     public Student(String name, int chinese, int math, int english) {

         super();

         this.name = name;

         this.chinese = chinese;

         this.math = math;

         this.english = english;

     }

     public String getName() {

         return name;

     }

     public void setName(String name) {

         this.name = name;

     }

     public int getChinese() {

         return chinese;

     }

     public void setChinese(int chinese) {

         this.chinese = chinese;

     }

     public int getMath() {

         return math;

     }

     public void setMath(int math) {

         this.math = math;

     }

     public int getEnglish() {

         return english;

     }

     public void setEnglish(int english) {

         this.english = english;

     }

     public int getSum() { // 获得总分

         return this.chinese + this.math + this.english;

     }

 }

 package cn.itcast_06;

 import java.io.BufferedWriter;

 import java.io.FileWriter;

 import java.io.IOException;

 import java.util.Comparator;

 import java.util.Scanner;

 import java.util.TreeSet;

 /*

  * 键盘录入5个学生信息(姓名,语文成绩,数学成绩,英语成绩),按照总分从高到低存入文本文件

  *

  * 分析：

  *         A:创建学生类

  *         B:创建集合对象

  *             TreeSet<Student>

  *         C:键盘录入学生信息存储到集合

  *         D:遍历集合，把数据写到文本文件

  */

 public class StudentDemo {

     public static void main(String[] args) throws IOException {

         // 创建集合对象

         TreeSet<Student> ts = new TreeSet<Student>(new Comparator<Student>() {

             @Override

             public int compare(Student s1, Student s2) {

                 int num = s2.getSum() - s1.getSum(); //总分排序是由高到低

                 int num2 = num == 0 ? s1.getChinese() - s2.getChinese() : num;

                 int num3 = num2 == 0 ? s1.getMath() - s2.getMath() : num2;

                 int num4 = num3 == 0 ? s1.getEnglish() - s2.getEnglish() : num3;

                 int num5 = num4 == 0 ? s1.getName().compareTo(s2.getName())

                         : num4;

                 return num5;

             }

         });

         // 键盘录入学生信息存储到集合

         for (int x = 1; x <= 5; x++) {

             Scanner sc = new Scanner(System.in);

             System.out.println("请录入第" + x + "个的学习信息");

             System.out.println("姓名：");

             String name = sc.nextLine();

             System.out.println("语文成绩：");

             int chinese = sc.nextInt();

             System.out.println("数学成绩：");

             int math = sc.nextInt();

             System.out.println("英语成绩：");

             int english = sc.nextInt();

             // 创建学生对象

             Student s = new Student();

             s.setName(name);

             s.setChinese(chinese);

             s.setMath(math);

             s.setEnglish(english);

             // 把学生信息添加到集合

             ts.add(s);

         }

         // 遍历集合，把数据写到文本文件

         BufferedWriter bw = new BufferedWriter(new FileWriter("students.txt"));

         bw.write("学生信息如下：");

         bw.newLine();

         bw.flush();

         bw.write("姓名,语文成绩,数学成绩,英语成绩");

         bw.newLine();

         bw.flush();

         for (Student s : ts) {

             StringBuilder sb = new StringBuilder();

             sb.append(s.getName()).append(",").append(s.getChinese())

                     .append(",").append(s.getMath()).append(",")

                     .append(s.getEnglish());

             bw.write(sb.toString());

             bw.newLine();

             bw.flush();

         }

         // 释放资源

         bw.close();

         System.out.println("学习信息存储完毕");

     }

 }