小项目1
public class User {
private String username;
private String password;
private String id;
private String phoneNumber;
public User() {
}
public User(String username, String password, String id, String phoneNumber) {
this.username = username;
this.password = password;
this.id = id;
this.phoneNumber = phoneNumber;
}
public String getUsername() {
return username;
}
public void setUsername(String username) {
this.username = username;
}
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}
public String getId() {
return id;
}
public void setId(String id) {
this.id = id;
}
public String getPhoneNumber() {
return phoneNumber;
}
public void setPhoneNumber(String phoneNumber) {
this.phoneNumber = phoneNumber;
}
}
public class Student {
private String id;
private String name;
private int age;
private String homeAddress;
public Student() {
}
public Student(String id, String name, int age, String homeAddress) {
this.id = id;
this.name = name;
this.age = age;
this.homeAddress = homeAddress;
}
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 getHomeAddress() {
return homeAddress;
}
public void setHomeAddress(String homeAddress) {
this.homeAddress = homeAddress;
}
}
import java.util.ArrayList;
import java.util.Random;
import java.util.Scanner;
public class userTest_reallyimportant {
public static void main(String[] args) {
ArrayList
Scanner sc = 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 4.退出”);
String choose = sc.next();
switch (choose) {
case “1” -> login(list);
case “2” -> register(list);
case “3” -> forgetPassword(list);
case “4” -> System.exit(0);
default -> System.out.println(“输入有误,请重新输入”);
}
}
}
public static void login(ArrayList<User> list) {
Scanner sc = new Scanner(System.in);
for (int i = 0; i < 3; i++) {
System.out.println("请输入用户名:");
String username = sc.next();
boolean flag = contains(list, username);
if (!flag) {
System.out.println("用户名不存在,请输入正确用户名");
return;
}
System.out.println("请输入密码:");
String password = sc.next();
while (true) {
String code = getcode();
System.out.println("验证码为:" + code);
System.out.println("请输入验证码:");
String code1 = sc.next();
if (!code.equalsIgnoreCase(code1)) {
System.out.println("验证码错误,请重新输入");
continue;
} else {
break;
}
}
User u = new User(username, password, null, null);
boolean flag1 = checkcode(list, u);
if (!flag1) {
if (i == 2) {
System.out.println("三次密码错误,账号被锁定");
return;//结束方法
} else {
System.out.println("密码错误,请重新输入你还有" + (2 - i) + "次机会");
}
} else {
System.out.println("登录成功");
StudentTest_important ss=new StudentTest_important();
ss.starttest();
break;
}
}
}
public static void register(ArrayList<User> list) {
Scanner sc = new Scanner(System.in);
String username;
while (true) {
System.out.println("请输入用户名:");
username = sc.next();
boolean flag = contains(list, username);
if (flag) {
System.out.println("用户名已存在,请重新输入");
continue;
} else {
boolean flag1 = checkname(username);
if (flag1) {
break;
} else {
System.out.println("用户名不符合要求,请重新输入");
continue;
}
}
}
String password;
while (true) {
System.out.println("请输入密码:");
password = sc.next();
System.out.println("请输入确认密码:");
String password1 = sc.next();
if (password.equals(password1)) {
break;
} else {
System.out.println("两次密码不一致,请重新输入");
continue;
}
}
String id;
while (true) {
System.out.println("请输入身份证号:");
id = sc.next();
boolean flag2 = checkid(id);
if (flag2) {
break;
} else {
System.out.println("身份证号不符合要求,请重新输入");
continue;
}
}
String phoneNumber;
while (true) {
System.out.println("请输入手机号:");
phoneNumber = sc.next();
boolean flag3 = checksecnumber(phoneNumber);
if (flag3) {
break;
} else {
System.out.println("手机号不符合要求,请重新输入");
continue;
}
}
User u = new User(username, password, id, phoneNumber);
list.add(u);
System.out.println("注册成功");
}
public static void forgetPassword(ArrayList<User> list) {
Scanner sc = new Scanner(System.in);
System.out.println("请输入用户名:");
String username = sc.next();
boolean flag = contains(list, username);
if (!flag) {
System.out.println("用户名不存在,请输入正确用户名");
return;
}
System.out.println("请输入身份证号:");
String id = sc.next();
System.out.println("请输入手机号:");
String phoneNumber = sc.next();
int index = getIndex(list, username);
User u1 = list.get(index);
User u = new User(username, null, id, phoneNumber);
String password;
while (true) {
if (u1.getId().equals(u.getId()) && u1.getPhoneNumber().equals(u.getPhoneNumber())) {
System.out.println("请输入新密码:");
password = sc.next();
System.out.println("请输入确认密码:");
String password1 = sc.next();
if (password.equals(password1)) {
System.out.println("密码修改成功");
break;
} else {
System.out.println("两次密码不一致,请重新输入");
continue;
}
} else {
System.out.println("身份证号或手机号错误,请重新输入");
return;
}
}u1.setPassword(password);
}
public static int getIndex(ArrayList<User> list, String username) {
for (int i = 0; i < list.size(); i++) {
User u1 = list.get(i);
if (u1.getUsername().equals(username)) {
return i;
}
}
return -1;
}
public static String getcode() {
ArrayList<Character> list = new ArrayList<>();
for (int i = 0; i < 26; i++) {
list.add((char) ('a' + i));
list.add((char) ('A' + i));
}
for (int i = 0; i < 10; i++) {
list.add((char) ('0' + i));
}
StringBuilder sb = new StringBuilder();
Random random = new Random();
for (int i = 0; i < 5; i++) {
int index;
if (i == 4) {
index = random.nextInt(10) + 52;
sb.append(list.get(index));
} else {
index = random.nextInt(52);
sb.append(list.get(index));
}
}
for (int i = 0; i < sb.length(); i++) {
int index = random.nextInt(5);
char temp = sb.charAt(i);
sb.setCharAt(i, sb.charAt(index));
sb.setCharAt(index, temp);
}
return sb.toString();
}
public static boolean checkcode(ArrayList<User> list, User u) {
for (int i = 0; i < list.size(); i++) {
User u1 = list.get(i);
if (u1.getUsername().equals(u.getUsername()) && u1.getPassword().equals(u.getPassword())) {
return true;
}
}
return false;
}
public static boolean contains(ArrayList<User> list, String username) {
String username1;
for (int i = 0; i < list.size(); i++) {
username1 = list.get(i).getUsername();
if (username1.equals(username)) {
return true;
}
}
return false;
}
public static boolean checkname(String username) {
if (username.length() < 3 || username.length() > 13) {
return false;
}
for (int i = 0; i < username.length(); i++) {
char c = username.charAt(i);
if (!((c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z') || (c >= '0' && c <= '9'))) {
return false;
}
}
for (int i = 0; i < username.length(); i++) {
char c = username.charAt(i);
if ((c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z')) {
return true;
}
}
return false;
}
public static boolean checkid(String id) {
for (int i = 0; i < id.length() - 1; i++) {
char c = id.charAt(i);
if (!(c >= '0' && c <= '9')) {
return false;
}
}
char c = id.charAt(id.length() - 1);
if ((c >= '0' && c <= '9') || (c == 'x' || c == 'X')) {
return true;
}
return false;
}
public static boolean checksecnumber(String phoneNumber) {
if (phoneNumber.length() != 11) {
return false;
}
if (phoneNumber.startsWith("0")) return false;
for (int i = 0; i < phoneNumber.length(); i++) {
char c = phoneNumber.charAt(i);
if (!(c >= '0' && c <= '9')) {
return false;
}
}
return true;
}
}
import java.util.ArrayList;
import java.util.Scanner;
public class StudentTest_important {
public static void starttest() {
ArrayList
loop:
while (true) {
System.out.println(“————欢迎来到学生管理系统————“);
System.out.println(“1.添加学生”);
System.out.println(“2.删除学生”);
System.out.println(“3.修改学生”);
System.out.println(“4.查询学生”);
System.out.println(“5.退出系统”);
System.out.println(“请输入你的选择：”);
Scanner sc = new Scanner(System.in);
String choose;
choose = sc.next();
switch (choose) {
case “1” -> addStudent(list);
case “2” -> deleteStudent(list);
case “3” -> updateStudent(list);
case “4” -> queryStudent(list);
case “5” -> {
System.out.println(“退出系统”);
//break loop;
System.exit(0);
}
default -> System.out.println(“输入有误，请重新输入”);
}
}
}
public static void addStudent(ArrayList<Student> list) {
Scanner sc = new Scanner(System.in);
Student st = new Student();
while (true) {
System.out.println("请输入学生学号：");
String id = sc.next();
boolean flag = contains(list, id);
if (flag) {
System.out.println("学号已存在，请重新输入");
} else {
System.out.println("学号不存在,请继续输入");
st.setId(id);
break;
}
}
System.out.println("请输入学生姓名：");
String name = sc.next();
st.setName(name);
System.out.println("请输入学生年龄：");
int age = sc.nextInt();
st.setAge(age);
System.out.println("请输入学生家庭住址：");
String homeAddress = sc.next();
st.setHomeAddress(homeAddress);
list.add(st);
System.out.println("添加学生成功");
}
public static void deleteStudent(ArrayList<Student> list) {
Scanner sc = new Scanner(System.in);
System.out.println("请输入要删除的学生学号：");
String id = sc.next();
boolean flag = contains(list, id);
if (flag) {
for (int i = 0; i < list.size(); i++) {
Student st = list.get(i);
if (st.getId().equals(id)) {
list.remove(i);
System.out.println("删除成功");
break;
}
}
} else {
System.out.println("学号不存在");
}
}
public static void updateStudent(ArrayList<Student> list) {
System.out.println("修改学生");
Scanner sc = new Scanner(System.in);
System.out.println("请输入要修改的学生学号：");
String id = sc.next();
boolean flag = contains(list, id);
if (flag) {
loop:for (int i = 0; i < list.size(); i++) {
Student st = list.get(i);
if (st.getId().equals(id)) {
System.out.println("请输入修改后的学号:");
st.setId(sc.next());
if (contains(list, st.getId())) {
System.out.println("请输入修改后的姓名:");
st.setName(sc.next());
System.out.println("请输入修改后的年龄:");
st.setAge(sc.nextInt());
System.out.println("请输入修改后的家庭住址:");
st.setHomeAddress(sc.next());
System.out.println("修改成功");
break loop;
}else {
System.out.println("学号不存在");
break;
}
}
}
} else {
System.out.println("学号不存在");
}
}
public static void queryStudent(ArrayList<Student> list) {
if (list.size() == 0) {
System.out.println("无信息，请添加后重试");
return;
}
System.out.println("学号\t\t姓名\t\t年龄\t\t家庭住址");
for (int i = 0; i < list.size(); i++) {
Student st = list.get(i);
System.out.println(st.getId() + "\t\t" + st.getName() + "\t\t" + st.getAge() + "\t\t" + st.getHomeAddress());
}
}
public static boolean contains(ArrayList<Student> list, String id) {
for (int i = 0; i < list.size(); i++) {
Student st = list.get(i);
if (st.getId().equals(id)) {
return true;
}
}
return false;
}
}
总共两个类,两个大的测试方法组成
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