我该怎么将学生的信息写入到一个硬盘文件里面，新手不理解文件输入输出。

Question

import java.io.FileNotFoundException;

import java.io.PrintWriter;

import java.util.*;

public class PrintWriterTest

{ //学号、姓名、性别、出生日期、所学专业
private int number;
private String name;
private String sex;
private String birthday;
private String major;
public void setstudent(int number,String name,String sex,String birthday,String major){
this.number=number;
this.name=name;
this.sex=sex;
this.birthday=birthday;
this.major=major;
}
public String getstudent() {
return "学号 "+number+" "+"姓名 "+name+" "+"性别 "+sex+" "+"生日 "+birthday+" "+"专业 "+major;
}
public static void main(String[] args) throws FileNotFoundException

{

    Scanner in = new Scanner(System.in);
    System.out.println("请输入要存储多少学生信息：");
    int a=in.nextInt();
    for (int i = 0; i <a ; i++) {
    System.out.println("请输入学号：");
    int Num=in.nextInt();
    System.out.println("请输入姓名：");
    String Name=in.next();
    System.out.println("请输入性别：");
    String Sex=in.next();
    System.out.println("请输入生日日期：");
    String Birth=in.next();
    System.out.println("请输入专业名称：");
    String Major=in.next();


     PrintWriterTest stu = new PrintWriterTest();
     stu.setstudent(Num, Name, Sex, Birth, Major);
     System.out.println(stu.getstudent());

    }

Answer 1

FileOutputStream fos=null;

try {

if (!f.exists()) {//文件不存在则创建 f.createNewFile(); } fos=new FileOutputStream(f); String str="文件内容"; fos.write(str.getBytes());//写入文件内容 fos.flush(); } catch (IOException e) { System.err.println("文件创建失败");}finally{ if (fos!=null) { try { fos.close(); } catch (IOException e) { System.err.println("文件流关闭失败"); } }}