代码
public class Student {
private String id;
private String name;
private int age;
private String address;
public Student() {
}
public Student(String id, String name, int age, String address) {
this.id = id;
this.name = name;
this.age = age;
this.address = address;
}
public String getId() {
return id;
}
public void setId(String id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public int getAge() {
return age;
}
public void setAge(int age) {
this.age = age;
}
public String getAddress() {
return address;
}
public void setAddress(String address) {
this.address = address;
}
}
import java.util.ArrayList;
import java.util.Random;
import java.util.Scanner;
public class App {
public static void main(String[] args) {
ArrayList<User> user = new ArrayList<>();
System.out.println("录入数据中...");
User u1 = new User("zhangsan", "123", "610302195607011642", "13669125183");
User u2 = new User("lisi", "456", "620502196006248385", "13363222321");
User u3 = new User("wangwu", "789", "512731188706034846", "13765642332");
User u4 = new User("zhaoliu", "123456", "140725184710194731", "13464323579");
user.add(u1);
user.add(u2);
user.add(u3);
user.add(u4);
System.out.println("录入完毕");
String username;
String password;
String id;
String phoneNumber;
Scanner sc1 = new Scanner(System.in);
while (true) {
System.out.println("欢迎来到学生管理系统");
System.out.println("请选择操作1登录 2注册 3忘记密码");
int select = sc1.nextInt();
switch (select) {
case 1:
while (true) {
System.out.println("登录");
System.out.println("请输入用户名:(输入-1,则返回登录界面)");
username = sc1.next();
if (username.equals("-1")) {
break;
}
if (login(username, user)) {
System.out.println("登录成功");
// StudentSytstem studentSytstem = new StudentSytstem();
StudentSytstem.start();
// showAll(user);
break;
} else {
System.out.println("登录失败");
System.out.println("-----------------------------------------");
}
}
break;
case 2:
while (true) {
System.out.println("注册");
System.out.println("请输入用户名:(输入-1,则返回登录界面)");
username = sc1.next();
if (!usernameRule(username)) {
System.out.println("username格式错误");
System.out.println("用户名唯一" + "\n" +
"用户名长度必须在3~15位之间" + "\n" +
"只能是字母加数字的组合,但是不能是纯数字");
System.out.println("-----------------------------------------");
continue;
}
if (username.equals("-1")) {
break;
}
if (register(username, user)) {
System.out.println("注册成功");
printList(user);
System.out.println("-----------------------------------------");
break;
} else {
System.out.println("删除失败");
System.out.println("-----------------------------------------");
}
}
break;
case 3:
while(true) {
System.out.println("忘记密码");
System.out.println("请输入username:(输入-1,则返回登录界面)");
username = sc1.next();
if (username.equals("-1")) {
break;
}
if(forgetPassword(username, user)) {
System.out.println("修改成功");
System.out.println("-----------------------------------------");
break;
} else {
System.out.println("修改失败");
System.out.println("-----------------------------------------");
}
}
break;
case 4:
System.out.println("谢谢使用,再见!");
System.exit(0);
break;
default:
System.out.println("没有这个选项");
break;
}
}
}
private static void printList(ArrayList<User> user) {
System.out.println(String.format(
String.format("%-16s |", "姓名") +
String.format("%-8s |", "密码") +
String.format("%-18s |", "身份证号") +
String.format("%-8s |", "手机号码")));
for (int i = 0; i < user.size(); i++) {
System.out.print(String.format("%-16s |", user.get(i).getUsername()));
System.out.print(String.format("%-8s |", user.get(i).getPassword()));
System.out.print(String.format("%-18s |", user.get(i).getId()));
System.out.print(String.format("%-8s |", user.get(i).getPhoneNumber()));
System.out.println();
}
}
public static boolean login(String username, ArrayList<User> user) {
Scanner sc2 = new Scanner(System.in);
/*
* // 生成四位随机数字的验证码,取消注释
* Random random = new Random();
* int randomNumber = random.nextInt(9000) + 1000;
*/
for (int i = 0; i < user.size(); i++) {
if (username.equals(user.get(i).getUsername())){
System.out.println("请输入密码:");
String password = sc2.next();
// 生成四位随机数字的验证码,替换下一行代码
// String generate_code = String.valueOf(randomNumber);
String generate_code = getCode();
System.out.println("验证码为:" + generate_code);
System.out.println("请输入验证码:");
String code = sc2.next();
if (user.get(i).getPassword().equals(password) && generate_code.equals(code)) {
System.out.println("密码或验证码错误!");
return true;
}
}
}
System.out.println("用户不存在");
return false;
}
public static boolean register(String username, ArrayList<User> user) {
for (int i = 0; i < user.size(); i++) {
if (username.equals(user.get(i).getUsername())){
System.out.println("用户名已存在,不能录入");
return false;
}
}
Scanner sc3 = new Scanner(System.in);
String password1, password2;
while (true) {
System.out.println("请输入password:");
password1 = sc3.next();
System.out.println("请重新输入一次password:");
password2 = sc3.next();
if (password1.equals(password2)) {
break;
}
System.out.println("两次输入的password不一样,请重新输入");
}
while (true) {
System.out.println("请输入id:");
String id = sc3.next();
if (!idRule(id)) {
System.out.println("id格式错误,请重新输入id:");
continue;
}
System.out.println("请输入phoneNumber:");
String phoneNumber = sc3.next();
if (!phoneNumberRule(phoneNumber)) {
System.out.println("phoneNumber格式错误,请重新输入phoneNumber:");
continue;
}
User u = new User(username, password1, id, phoneNumber);
user.add(u);
return true;
}
}
public static boolean forgetPassword(String username, ArrayList<User> user) {
Scanner sc4 = new Scanner(System.in);
for (int i = 0; i < user.size(); i++) {
if (!username.equals(user.get(i).getUsername())){
System.out.println("用户名不存在,不能修改密码");
return false;
} else {
while (true) {
System.out.println("请输入id:");
String id = sc4.next();
if (!idRule(id)) {
System.out.println("id格式错误");
continue;
}
System.out.println("请输入phoneNumber:");
String phoneNumber = sc4.next();
if (!phoneNumberRule(phoneNumber)) {
System.out.println("phoneNumber格式错误");
continue;
}
if (id.equals(user.get(i).getId()) && phoneNumber.equals(user.get(i).getPhoneNumber())) {
System.out.println("请输入要修改的password:");
String new_password =sc4.next();
user.get(i).setPassword(new_password);
return true;
}
}
}
}
System.out.println("账号信息不匹配,修改失败");
return false;
}
// 到len为止全是数字
public static boolean isNumber(String target, int len) {
boolean flag = true;
for (int i = len;--i>=0;){
if (!Character.isDigit(target.charAt(i))){
flag = false;
}
}
if (flag)
return true;
return false;
}
/*
* 不使用正则表达式,判断用户名
*/
public static boolean usernameRule(String username) {
int length = username.length();
if ((length >= 3 && length <= 15) && !(isNumber(username, length))){
return true;
}
return false;
}
public static boolean idRule(String id) {
int length = id.length();
if (length == 18
&& !(id.charAt(0) == '0')
&& isNumber(id, 17)
&& ((isNumber(String.valueOf(id.charAt(17)), 1)) || id.endsWith("X") || id.endsWith("x"))) {
return true;
}
return false;
}
public static boolean phoneNumberRule(String phoneNumber) {
int length = phoneNumber.length();
if (length == 11
&& !(phoneNumber.startsWith("0"))
&& isNumber(phoneNumber, 11)) {
return true;
}
return false;
}
private static String getCode() {
//1.创建一个集合添加所有的大写和小写字母
ArrayList<Character> list = new ArrayList<>();
for (int i = 0; i < 26; i++) {
list.add((char) ('a' + i));
list.add((char) ('A' + i));
}
StringBuilder sb = new StringBuilder();
//2.要随机抽取4个字符
Random r = new Random();
for (int i = 0; i < 4; i++) {
//获取随机索引
int index = r.nextInt(list.size());
//利用随机索引获取字符
char c = list.get(index);
//把随机字符添加到sb当中
sb.append(c);
}
//3.把一个随机数字添加到末尾
int number = r.nextInt(10);
sb.append(number);
//4.如果我们要修改字符串中的内容
//先把字符串变成字符数组,在数组中修改,然后再创建一个新的字符串
char[] arr = sb.toString().toCharArray();
//拿着最后一个索引,跟随机索引进行交换
int randomIndex = r.nextInt(arr.length);
//最大索引指向的元素 跟随机索引指向的元素交换
char temp = arr[randomIndex];
arr[randomIndex] = arr[arr.length - 1];
arr[arr.length - 1] = temp;
return new String(arr);
}
}
import java.util.ArrayList;
import java.util.Random;
import java.util.Scanner;
public class App {
static ArrayList<User> user = new ArrayList<>();
static {
System.out.println("录入数据中...");
User u1 = new User("zhangsan", "123", "610302195607011642", "13669125183");
User u2 = new User("lisi", "456", "620502196006248385", "13363222321");
User u3 = new User("wangwu", "789", "512731188706034846", "13765642332");
User u4 = new User("zhaoliu", "123456", "140725184710194731", "13464323579");
user.add(u1);
user.add(u2);
user.add(u3);
user.add(u4);
System.out.println("录入完毕");
}
public static void main(String[] args) throws InterruptedException {
String username;
String password;
String id;
String phoneNumber;
Scanner sc1 = new Scanner(System.in);
while (true) {
System.out.println("欢迎来到学生管理系统");
System.out.println("请选择操作1登录 2注册 3忘记密码");
int select = sc1.nextInt();
switch (select) {
case 1:
while (true) {
System.out.println("登录");
System.out.println("请输入用户名:(输入-1,则返回登录界面)");
username = sc1.next();
if (username.equals("-1")) {
break;
}
if (login(username, user)) {
System.out.println("登录成功");
// StudentSytstem studentSytstem = new StudentSytstem();
StudentSytstem.start();
// showAll(user);
break;
} else {
System.out.println("登录失败");
System.out.println("-----------------------------------------");
}
}
break;
case 2:
while (true) {
System.out.println("注册");
System.out.println("请输入用户名:(输入-1,则返回登录界面)");
username = sc1.next();
if (!usernameRule(username)) {
System.out.println("username格式错误");
System.out.println("用户名唯一" + "\n" +
"用户名长度必须在3~15位之间" + "\n" +
"只能是字母加数字的组合,但是不能是纯数字");
System.out.println("-----------------------------------------");
continue;
}
if (username.equals("-1")) {
break;
}
if (register(username, user)) {
System.out.println("注册成功");
System.out.println("-----------------------------------------");
break;
} else {
System.out.println("删除失败");
System.out.println("-----------------------------------------");
}
}
break;
case 3:
while(true) {
System.out.println("忘记密码");
System.out.println("请输入username:(输入-1,则返回登录界面)");
username = sc1.next();
if (username.equals("-1")) {
break;
}
if(forgetPassword(username, user)) {
System.out.println("修改成功");
System.out.println("-----------------------------------------");
break;
} else {
System.out.println("修改失败");
System.out.println("-----------------------------------------");
}
}
break;
case 4:
System.out.println("谢谢使用,再见!");
System.exit(0);
break;
default:
System.out.println("没有这个选项");
break;
}
}
}
public static boolean login(String username, ArrayList<User> user) throws InterruptedException {
Scanner sc2 = new Scanner(System.in);
/*
* // 生成四位随机数字的验证码,取消注释
* Random random = new Random();
* int randomNumber = random.nextInt(9000) + 1000;
*/
for (int i = 0; i < user.size(); i++) {
if (username.equals(user.get(i).getUsername())){
for (int j = 0; j < 3; j++) {
System.out.println("请输入密码:");
String password = sc2.next();
// 生成四位随机数字的验证码,替换下一行代码
// String generate_code = String.valueOf(randomNumber);
String generate_code = getCode();
System.out.println("验证码为:" + generate_code);
System.out.println("请输入验证码:");
String code = sc2.next();
if (user.get(i).getPassword().equals(password) && generate_code.equals(code)) {
return true;
}
if (j == 2) {
System.out.println("当前系统被锁定3秒");
Thread.sleep(3000);
} else {
System.out.println("用户名、密码或验证码错误,还剩下" + (2 - j) + "次机会");
}
}
}
}
System.out.println("当前用户" + username + "不存在,请先注册");
return false;
}
public static boolean register(String username, ArrayList<User> user) {
for (int i = 0; i < user.size(); i++) {
if (username.equals(user.get(i).getUsername())){
System.out.println("用户名已存在,不能反复注册");
return false;
}
}
Scanner sc3 = new Scanner(System.in);
String password1, password2;
while (true) {
System.out.println("请输入password:");
password1 = sc3.next();
System.out.println("请重新输入一次password:");
password2 = sc3.next();
if (password1.equals(password2)) {
break;
}
System.out.println("两次输入的password不一样,请重新输入");
}
while (true) {
System.out.println("请输入id:");
String id = sc3.next();
if (!idRule(id)) {
System.out.println("id格式错误,请重新输入id:");
continue;
}
System.out.println("请输入phoneNumber:");
String phoneNumber = sc3.next();
if (!phoneNumberRule(phoneNumber)) {
System.out.println("phoneNumber格式错误,请重新输入phoneNumber:");
continue;
}
User u = new User(username, password1, id, phoneNumber);
user.add(u);
System.out.println(
String.format("%-16s|", "姓名") +
String.format("%-8s|", "密码") +
String.format("%-18s|", "身份证号") +
String.format("%-8s|", "手机号码"));
System.out.print(String.format("%-16s|", username));
System.out.print(String.format("%-8s|", password1));
System.out.print(String.format("%-18s|", id));
System.out.print(String.format("%-8s", phoneNumber));
System.out.println();
return true;
}
}
public static boolean forgetPassword(String username, ArrayList<User> user) {
Scanner sc4 = new Scanner(System.in);
for (int i = 0; i < user.size(); i++) {
if (!username.equals(user.get(i).getUsername())){
System.out.println("用户名不存在,不能修改密码,请先注册");
return false;
} else {
while (true) {
System.out.println("请输入id:");
String id = sc4.next();
if (!idRule(id)) {
System.out.println("id格式错误");
continue;
}
System.out.println("请输入phoneNumber:");
String phoneNumber = sc4.next();
if (!phoneNumberRule(phoneNumber)) {
System.out.println("phoneNumber格式错误");
continue;
}
if (id.equals(user.get(i).getId()) && phoneNumber.equals(user.get(i).getPhoneNumber())) {
System.out.println("请输入要修改的password:");
String new_password =sc4.next();
// 如果想要校验密码,仿照上面的就行,这里不重复了
user.get(i).setPassword(new_password);
return true;
}
}
}
}
System.out.println("账号信息不匹配,修改失败");
return false;
}
// 到len为止全是数字
public static boolean isNumber(String target, int len) {
boolean flag = true;
for (int i = len;--i>=0;){
if (!Character.isDigit(target.charAt(i))){
flag = false;
}
}
if (flag)
return true;
return false;
}
/*
* 不使用正则表达式,判断用户名
*/
public static boolean usernameRule(String username) {
int length = username.length();
if ((length >= 3 && length <= 15) && !(isNumber(username, length))){
return true;
}
return false;
}
public static boolean idRule(String id) {
int length = id.length();
if (length == 18
&& !(id.charAt(0) == '0')
&& isNumber(id, 17)
&& ((isNumber(String.valueOf(id.charAt(17)), 1)) || id.endsWith("X") || id.endsWith("x"))) {
return true;
}
return false;
}
public static boolean phoneNumberRule(String phoneNumber) {
int length = phoneNumber.length();
if (length == 11
&& !(phoneNumber.startsWith("0"))
&& isNumber(phoneNumber, 11)) {
return true;
}
return false;
}
private static String getCode() {
//1.创建一个集合添加所有的大写和小写字母
ArrayList<Character> list = new ArrayList<>();
for (int i = 0; i < 26; i++) {
list.add((char) ('a' + i));
list.add((char) ('A' + i));
}
StringBuilder sb = new StringBuilder();
//2.要随机抽取4个字符
Random r = new Random();
for (int i = 0; i < 4; i++) {
//获取随机索引
int index = r.nextInt(list.size());
//利用随机索引获取字符
char c = list.get(index);
//把随机字符添加到sb当中
sb.append(c);
}
//3.把一个随机数字添加到末尾
int number = r.nextInt(10);
sb.append(number);
//4.如果我们要修改字符串中的内容
//先把字符串变成字符数组,在数组中修改,然后再创建一个新的字符串
char[] arr = sb.toString().toCharArray();
//拿着最后一个索引,跟随机索引进行交换
int randomIndex = r.nextInt(arr.length);
//最大索引指向的元素 跟随机索引指向的元素交换
char temp = arr[randomIndex];
arr[randomIndex] = arr[arr.length - 1];
arr[arr.length - 1] = temp;
return new String(arr);
}
}
import java.util.ArrayList;
import java.util.Scanner;
public class StudentSytstem {
private static final String ADD_STUDENT = "1";
private static final String DELE_STUDENT = "2";
private static final String UPDATE_STUDENT = "3";
private static final String QUERY_STUDENT = "4";
private static final String ALL_STUDENT = "5";
private static final String LOGIN = "6";
private static final String EXIT = "7";
static ArrayList<Student> student = new ArrayList<>();
static {
System.out.println("录入数据中...");
Student s1 = new Student("001", "张三", 23, "南京");
Student s2 = new Student("002", "李四", 24, "北京");
Student s3 = new Student("003", "王五", 25, "广州");
Student s4 = new Student("004", "赵六", 26, "深圳");
student.add(s1);
student.add(s2);
student.add(s3);
student.add(s4);
System.out.println("录入完毕");
}
public static void start() throws InterruptedException {
ArrayList<Student> student = new ArrayList<>();
System.out.println("录入数据中...");
Student s1 = new Student("001", "张三", 23, "南京");
Student s2 = new Student("002", "李四", 24, "北京");
Student s3 = new Student("003", "王五", 25, "广州");
Student s4 = new Student("004", "赵六", 26, "深圳");
student.add(s1);
student.add(s2);
student.add(s3);
student.add(s4);
System.out.println("录入完毕");
Scanner sc = new Scanner(System.in);
String id;
String name;
int age;
String address;
while(true) {
System.out.println(
"--------------欢迎来到学生管理系统-----------------" + "\n" +
"1:添加学生" + "\n" +
"2:删除学生" + "\n" +
"3:修改学生" + "\n" +
"4:查询学生" + "\n" +
"5:所有学生" + "\n" +
"6:返回登录界面" + "\n" +
"7:退出系统" + "\n" +
"请输入您的选择:");
int select = sc.nextInt();
switch (select) {
case ADD_STUDENT:
while(true) {
System.out.println("添加");
System.out.println("请输入id:(输入-1,则返回主菜单)");
id = sc.next();
if (id.equals("-1")) {
break;
}
if (addStudent(id, student)) {
System.out.println("添加成功");
showAll(student);
break;
} else {
System.out.println("添加失败");
}
}
break;
case DELE_STUDENT:
while (true) {
System.out.println("删除");
System.out.println("请输入id:(输入-1,则返回主菜单)");
id = sc.next();
if (id.equals("-1")) {
break;
}
if (deleteStudent(id, student)) {
System.out.println("删除成功");
showAll(student);
break;
} else {
System.out.println("删除失败");
}
}
break;
case UPDATE_STUDENT:
while(true) {
System.out.println("修改");
System.out.println("请输入id:(输入-1,则返回主菜单)");
id = sc.next();
if (id.equals("-1")) {
break;
}
if(updateStudent(id, student)) {
System.out.println("修改成功");
showAll(student);
break;
} else {
System.out.println("修改失败");
}
}
break;
case QUERY_STUDENT:
while(true) {
System.out.println("查询");
System.out.println("请输入id:(输入-1,则返回主菜单)");
id = sc.next();
if (id.equals("-1")) {
break;
}
if (queryStudent(id, student) != null) {
Student s = queryStudent(id, student);
System.out.println("id\t\t\t姓名\t\t年龄\t\t家庭住址");
System.out.print(s.getId() + "\t");
System.out.print(s.getName() + "\t\t");
System.out.print(s.getAge() + "\t\t");
System.out.print(s.getAddress());
System.out.println();
break;
} else {
System.out.println("查找失败");
}
}
break;
case ALL_STUDENT:
System.out.println("所有学生");
showAll(student);
break;
case LOGIN:
System.out.println("返回登录界面");
String[] args = {""};
App.main(args);
case EXIT:
System.out.println("退出系统");
System.exit(0);
default:
System.out.println("没有这个选项");
break;
}
}
}
private static Student queryStudent(String id, ArrayList<Student> student) {
if (student.size() == 0) {
System.out.println("当前无学生信息,请添加后再查询");
return null;
}
for (int i = 0; i < student.size(); i++) {
if (id.equals(student.get(i).getId())) {
Student s = student.get(i);
return s;
}
}
return null;
}
private static boolean updateStudent(String id, ArrayList<Student> student) {
Scanner sc = new Scanner(System.in);
for (int i = 0; i < student.size(); i++) {
if (id.equals(student.get(i).getId())) {
System.out.println(student.get(i).getName());
System.out.println("请输入修改的姓名:");
String new_name = sc.next();
System.out.println(student.get(i).getAge());
System.out.println("请输入修改的年龄:");
int new_age = sc.nextInt();
System.out.println(student.get(i).getAddress());
System.out.println("请输入修改的地址:");
String new_address = sc.next();
Student s = new Student(id, new_name, new_age, new_address);
student.set(i, s);
return true;
}
}
System.out.println("id不存在");
return false;
}
private static boolean deleteStudent(String id, ArrayList<Student> student) {
for (int i = 0; i < student.size(); i++) {
if (id.equals(student.get(i).getId())) {
student.remove(i);
return true;
}
}
return false;
}
private static boolean addStudent(String id, ArrayList<Student> student) {
for (int i = 0; i < student.size(); i++) {
if (id.equals(student.get(i).getId())){
System.out.println("id已存在,不能录入");
return false;
}
}
Scanner sc = new Scanner(System.in);
System.out.println("请输入name:");
String name = sc.next();
System.out.println("请输入age:");
int age = sc.nextInt();
System.out.println("请输入address:");
String address = sc.next();
Student s = new Student(id, name, age, address);
student.add(s);
return true;
}
private static void showAll(ArrayList<Student> student) {
if (student.size() == 0) {
System.out.println("当前无学生信息,请添加后再查询");
return;
}
for (int i = 0; i < student.size(); i++) {
if (i == 0) {
System.out.println(String.format("%-8s |", "id") + String.format("%-16s |", "姓名") + String.format("%-8s |", "年龄") + String.format("%-8s |", "家庭住址"));
}
System.out.print(String.format("%-8s |", student.get(i).getId()));
System.out.print(String.format("%-16s |", student.get(i).getName()));
System.out.print(String.format("%-8d |", student.get(i).getAge()));
System.out.print(String.format("%-8s |", student.get(i).getAddress()));
System.out.println();
}
}
}
需求
- 为学生管理系统书写一个登陆、注册、忘记密码的功能。
- 只有用户登录成功之后,才能进入到学生管理系统中进行增删改查操作。
- 采取控制台的方式去书写学生管理系统。
学生类
属性:id、姓名、年龄、家庭住址
用户类
属性:用户名、密码、身份证号码、手机号码
学生管理系统登录界面
注册功能
1,用户名需要满足以下要求
验证要求:
- 用户名唯一
- 用户名长度必须在3~15位之间
- 只能是字母加数字的组合,但是不能是纯数字
2,密码键盘输入两次,两次一致才可以进行注册
3,身份证号码需要验证
验证要求:
- 长度为18位
- 不能以0为开头
- 前17位,必须都是数字
- 最为一位可以是数字,也可以是大写X或小写x
4,手机号验证
- 验证要求:
- 长度为11位
- 不能以0为开头
- 必须都是数字
登录功能
1,键盘录入用户名
2,键盘录入密码
3,键盘录入验证码
验证要求:
- 用户名如果未注册,直接结束方法,并提示:用户名未注册,请先注册
- 判断验证码是否正确,如不正确,重新输入
- 再判断用户名和密码是否正确,有3次机会
登录成功
密码错误3次
用户不存在
忘记密码
1,键盘录入用户名,判断当前用户名是否存在,如不存在,直接结束方法,并提示:未注册
2,键盘录入身份证号码和手机号码
3,判断当前用户的身份证号码和手机号码是否一致,
- 如果一致,则提示输入密码,进行修改。
- 如果不一致,则提示:账号信息不匹配,修改失败。
验证码规则
- 长度为5
- 由4位大写或者小写字母和1位数字组成,同一个字母可重复
- 数字可以出现在任意位置
- 比如:aQa1K
添加功能
键盘录入每一个学生信息并添加,需要满足以下要求:
-
id唯一
删除功能
键盘录入要删除的学生id,需要满足以下要求:
-
id存在删除
-
id不存在,需要提示不存在,并回到初始菜单
修改功能
键盘录入要修改的学生id,需要满足以下要求
-
id存在,继续录入其他信息
-
id不存在,需要提示不存在,并回到初始菜单
查询功能
打印所有的学生信息,需要满足以下要求
-
如果没有学生信息,提示:当前无学生信息,请添加后再查询
-
如果有学生信息,需要按照格式输出。
待更新
1、正则表达式——>判断格式
2、数据的永久化存储——>登录次数过多,锁定账号
更新
2023/10/24 加入静态代码块文章来源:https://www.toymoban.com/news/detail-775176.html
结论
系统有较好的健壮性,对于大部分异常输入都会处理。如果发现有未处理的地方,请在评论区告诉我,我会尽快修改,谢谢!文章来源地址https://www.toymoban.com/news/detail-775176.html
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