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

Posted 2022-06-21 工程哥

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

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

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();
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");