1.集合类的操作。模拟用户登录,实现对多个用户信息的操作。 【需求】:对用户类的操作,添加用户(注册功能)、查找用户(登录功能)、修改用户(重置密码)等 【思路】: 1. 定义用户类的JavaBean:User(用户名、密码、生日) 2. 定义接口: 用户操作接口(IUserDao) 包含添加用户(注册功能)、查找用户(登录功能)、用户(重置密码)三 种抽象方法 3. 定义实现接口类:UserDaoImpl, 重写三个抽象方法,其中的登录功能可以“模拟用户登录”实验来完成。 4. 在test包中,定义一个测试类(TestUser), (1)添加main方法,定义ArrayList集合对象,实现添加3个学生的信息并存储在集合对象里。 (2)ArrayList集合元素采用增强型for实现遍历。 List集合元素采用迭代器遍历 java语言编写
时间: 2024-03-13 08:43:39 浏览: 16
好的,以下是Java语言编写的完整代码实现:
User.java:
```java
public class User {
private String username;
private String password;
private String birthday;
public User(String username, String password, String birthday) {
this.username = username;
this.password = password;
this.birthday = birthday;
}
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 getBirthday() {
return birthday;
}
public void setBirthday(String birthday) {
this.birthday = birthday;
}
}
```
IUserDao.java:
```java
public interface IUserDao {
void addUser(User user);
User findUser(String username, String password);
void modifyPassword(String username, String newPassword);
}
```
UserDaoImpl.java:
```java
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
public class UserDaoImpl implements IUserDao {
private List<User> userList = new ArrayList<>();
@Override
public void addUser(User user) {
userList.add(user);
System.out.println("添加用户成功:" + user.getUsername());
}
@Override
public User findUser(String username, String password) {
for (User user : userList) {
if (user.getUsername().equals(username) && user.getPassword().equals(password)) {
System.out.println("登录成功:" + user.getUsername());
return user;
}
}
System.out.println("登录失败:用户名或密码错误!");
return null;
}
@Override
public void modifyPassword(String username, String newPassword) {
for (User user : userList) {
if (user.getUsername().equals(username)) {
user.setPassword(newPassword);
System.out.println("修改密码成功:" + user.getUsername());
return;
}
}
System.out.println("修改密码失败:用户不存在!");
}
public List<User> getUserList() {
return userList;
}
public void printUserList() {
System.out.println("使用增强型for循环遍历List集合:");
for (User user : userList) {
System.out.println(user.getUsername() + " " + user.getPassword() + " " + user.getBirthday());
}
System.out.println("-----------------------");
System.out.println("使用迭代器遍历List集合:");
Iterator<User> iterator = userList.iterator();
while (iterator.hasNext()) {
User user = iterator.next();
System.out.println(user.getUsername() + " " + user.getPassword() + " " + user.getBirthday());
}
}
}
```
TestUser.java:
```java
import java.util.ArrayList;
public class TestUser {
public static void main(String[] args) {
IUserDao userDao = new UserDaoImpl();
User user1 = new User("张三", "123456", "2000-01-01");
userDao.addUser(user1);
User user2 = new User("李四", "123456", "2000-02-02");
userDao.addUser(user2);
User user3 = new User("王五", "123456", "2000-03-03");
userDao.addUser(user3);
User loginUser = userDao.findUser("李四", "123456");
userDao.modifyPassword("李四", "654321");
userDao.printUserList();
}
}
```
以上就是使用Java语言实现模拟用户登录的集合类操作的完整代码。
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