求一份学生信息管理的java源文件，要求可以增加，修改，删除，查询等功能，最好不用到数据库，谢谢。 5
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/*学生信息管理系统，实现学生信息：
*增加 int[] a=new int[9]
*删除
*查找
*更改
*File文件存储数据
*/
import java.util.Scanner;
import java.lang.*;
import java.io.*;
class Student {
private static Student[] s = new Student[2];
int n = 0;
private String name;
private int num;
private String classAge;
public void judge() throws IOException {
int i;
char ch;
String str;
Scanner In = new Scanner(System.in);
if (n == 0) {
System.out.print("你还没有录入任何学生，是否录入(Y/N):");
str = In.next();
ch = str.charAt(0);
while (ch != 'Y' && ch != 'y' && ch != 'N' && ch != 'n') {
System.out.print("输入有误，请重新输入:");
str = In.next();
ch = str.charAt(0);
}
if (ch == 'Y' || ch == 'y') {
this.add();
}
if (ch == 'N' || ch == 'n') {
this.menu();
}
}
}
public void menu() throws IOException// 定义菜单函数
{
int a;// 定义switch语句变量
Scanner in = new Scanner(System.in);// 实例化输入流对象
System.out.println("*******学生信息管理系统功能表******");
System.out.println("***** 1.增加 *****");
System.out.println("***** 2.显示 *****");
System.out.println("***** 3.修改 *****");
System.out.println("***** 4.删除 *****");
System.out.println("***** 5.查看 *****");
System.out.println("***** 0.退出 *****");
System.out.println("**********************************");
System.out.print("请选择(0~5):");
a = in.nextInt();
while (a < 0 || a > 5) {
System.out.print("输入超出范围，请重新输入:");
a = in.nextInt();
}
switch (a) {
case 1:
this.add();
break;
case 2:
this.show();
break;
case 3:
this.modif();
break;
case 4:
this.delete();
break;
case 5:
this.look();
break;
case 0:
System.exit(0);
break;
}
}
public void add() throws IOException// 定义增加函数
{
String str, str1, str2;
int i, num1, t = 1;
char ch, ch1;
FileWriter fw = new FileWriter("F://student.txt", true);
fw.write(" 录入的学生信息列表\r\n\r\n学号 姓名 班级\r\n");
Scanner In = new Scanner(System.in);
while (t == 1) {
System.out.print("请输入学生学号:");
num1 = In.nextInt();
for (i = 0; i < n; i++) {
while (s[i].num == num1) {
System.out.println("已存在此学号，请重新输入");
System.out.print("请输入学号:");
num1 = In.nextInt();
}
}
s[n].num = num1;
str2 = String.valueOf(num1);
fw.write(str2 + " ");
System.out.println();
System.out.print("请输入学生姓名:");
s[n].name = In.next();
fw.write(s[n].name + " ");
System.out.println();
System.out.print("请输入学生班级:");
s[n].classAge = In.next();
fw.write(s[n].classAge + "\r\n");
++n;
fw.close();
System.out.println();
System.out.print("是否继续添加(Y/N)");
str = In.next();
ch = str.charAt(0);
while (ch != 'N' && ch != 'n' && ch != 'Y' && ch != 'y') {
System.out.print("输入有误，请重新输入:");
str = In.next();
ch = str.charAt(0);
}
if (ch == 'N' || ch == 'n') {
break;
}
}
System.out.println();
System.out.print("是否返回主菜单(Y/N)");
str1 = In.next();
ch1 = str1.charAt(0);
while (ch1 != 'Y' && ch1 != 'y' && ch1 != 'N' && ch1 != 'n') {
System.out.print("输入有误，请重新输入:");
str1 = In.next();
ch1 = str1.charAt(0);
}
if (ch1 == 'Y' || ch1 == 'y') {
this.menu();
}
if (ch1 == 'N' || ch1 == 'n') {
System.out.println("正在退出...谢谢使用!");
System.exit(0);
}
}
public void show() throws IOException {
int i;
this.judge();
System.out.println("本次操作共录入" + n + "位学生!");
System.out.println("你录入的学生信息如下:");
System.out.println();
System.out.println("学号\t\t姓名\t班级");
for (i = 0; i < n; i++) {
System.out.println(s[i].num + " " + s[i].name + " "
+ s[i].classAge);
}
System.out.println("系统返回主菜单!");
this.menu();
}
public void delete() throws IOException// 删除信息功能实现 注：本功能暂时不具备可扩展性
{
this.judge();
int j = 0, t = 0, k = 0, num1;
char ch;
String str;
Scanner pin = new Scanner(System.in);
System.out.print("请输入要删除的学号:");
num1 = pin.nextInt();
for (j = 0; j < n; j++) {
if (s[j].num == num1) {
k = 1;
t = j;
}
}
if (k == 0) {
System.out.println("对不起！你要删除的学号不存在！");
System.out.println("系统将返回主菜单！");
this.menu();
}
if (k == 1) {
System.out.println("你要删除的学生信息如下:");// 打印管理员要删除的学生信息
System.out.println("学号\t姓名\t班级");// 本功能暂时不备扩展性
System.out.println(s[t].num + " " + s[t].name + " "
+ s[t].classAge);
System.out.println();
System.out.print("你确定要删除(Y/N):");
str = pin.next();
ch = str.charAt(0);
while (ch != 'Y' && ch != 'y' && ch != 'N' && ch != 'n') {
System.out.print("输入有误，请重新输入:");
str = pin.next();
ch = str.charAt(0);
}
if (ch == 'N' || ch == 'n') {
System.out.println();
System.out.println("系统返回主菜单！");
this.menu();
}
if (ch == 'Y' || ch == 'y') {
for (j = t; j < n - 1; j++) {
s[j] = s[j + 1];
}
n--;
System.out.println("数据成功删除!");
System.out.println("系统返回主菜单!");
this.menu();
}
}
}
public void look() throws IOException {
FileReader fr = new FileReader("F://student.txt");
int a;
while ((a = fr.read()) != -1) {
System.out.print((char) a);
}
fr.close();
System.out.println("系统返回主菜单！");
System.out.println();
this.menu();
}
public void modif() throws IOException {
this.judge();
int j = 0, t = 0, k = 0, num2, num3, moi, c = 1;
char ch;
String str, str1, str2;
Scanner pin = new Scanner(System.in);
System.out.print("请输入要修改的学号:");
num2 = pin.nextInt();
for (j = 0; j < n; j++) {
if (s[j].num == num2) {
k = 1;
t = j;
}
}
if (k == 0) {
System.out.println("对不起！你要修改的学号不存在！");
System.out.println("系统将返回主菜单！");
this.menu();
}
if (k == 1) {
System.out.println("你要修改的学生信息如下:");// 打印管理员要删除的学生信息
System.out.println("学号\t姓名\t班级");// 本功能暂时不备扩展性
System.out.println(s[t].num + " " + s[t].name + " "
+ s[t].classAge);
System.out.println();
System.out.print("你确定要修改(Y/N):");
str = pin.next();
ch = str.charAt(0);
while (ch != 'Y' && ch != 'y' && ch != 'N' && ch != 'n') {
System.out.print("输入有误，请重新输入:");
str = pin.next();
ch = str.charAt(0);
}
if (ch == 'N' || ch == 'n') {
System.out.println();
System.out.println("系统返回主菜单！");
this.menu();
}
while (c == 1) {
if (ch == 'Y' || ch == 'y') {
System.out
.println("****************************************");
System.out.println("***** 1.修改学号 *****");
System.out.println("***** 2.修改班级 *****");
System.out.println("***** 3.修改姓名 *****");
System.out
.println("****************************************");
System.out.print("请选择:");
moi = pin.nextInt();
switch (moi) {
case 1:
System.out.print("请输入新的学号:");
num3 = pin.nextInt();
s[t].num = num3;
break;
case 2:
System.out.print("请输入新的班级:");
str1 = pin.next();
s[t].classAge = str1;
break;
case 3:
System.out.print("请输入新的姓名:");
str2 = pin.next();
s[t].name = str2;
break;
}
System.out.println("数据已成功修改！");
}
System.out.print("是否继续修改(Y/N)");
str = pin.next();
ch = str.charAt(0);
System.out.println();
while (ch != 'Y' && ch != 'y' && ch != 'N' && ch != 'n') {
System.out.print("输入有误，请重新输入:");
str = pin.next();
ch = str.charAt(0);
}
if (ch == 'N' || ch == 'n') {
break;
}
}
}
System.out.println();
System.out.println("系统返回主菜单！");
this.menu();
}
public static void main(String[] args) throws IOException {
Student stu = new Student();
for (int i = 0; i < 2; i++) {
s[i] = new Student();
}
stu.menu();
}
}
运行代码前现在F盘新建student.txt文件，然后运行程序
学生信息存储在txt文件中：
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