Question

我有以下代码，我试图在链接列表中存储用户名和密码。根据用户从扫描仪输入的内容进行身份验证，但似乎无法使其正常工作。任何肝脏都会受到赞赏。

 import java.io.IOException;
 import java.util.LinkedList;

 //Linked lists declared to store, auctions, users, and items
 public class System1{

private static LinkedList<User> users = new LinkedList<User>();
public static String username;
public static String password;

     public static void main(String[] args) throws IOException,       InterruptedException {

    //User.setuser();

    String username = "user";
    String password = "pw123";

    users.add(new User("user", "pw123"));
    users.add(new User("user1", "pw123"));
    users.add(new User("user2", "pw123"));


    User.validateLogIn(users, username, password);

    System.out.println("If true you are logged in:" + User.userLogedIn);

第二课

public class User {

public User(String username, String password) {
}
static boolean userLogedIn;

public static void validateLogIn( LinkedList<User> users, String username,      String password) {

Iterator<User> spin = users.iterator();
while (spin.hasNext()){
    User user = spin.next();

    //System.out.println("Searching");
    //System.out.println(username);
    if(username.equals(user.setUsername()) && password.equals(user.setPassword())) {
        //System.out.println("BINGO!");
        userLogedIn=true;
    } else {
        //return false;
        //System.out.println("User not found" + "\n");
    }
    }
 }

private String setUsername() {
String username = "user1";
System.out.println("Enter your username: ");
 Scanner scanner = new Scanner(System.in);
username = scanner.nextLine();

return username;
}

private String setPassword() {
String password = "pw123";
return password ;
}

/*public static void setuser(){
 System.out.println("Enter your username: ");
 Scanner scanner = new Scanner(System.in);
 System1.username = scanner.nextLine();
 System.out.println("Your username is " + System1.username);
 System.out.println("Enter your password: ");
 Scanner scanner1 = new Scanner(System.in);
 System1.password = scanner1.nextLine();
 System.out.println("Your password is " + System1.password);
 }*/

Answer 1

首先，您需要存储添加到链接列表的用户名和密码（在“用户类”构建器中）

其次，您在验证时尝试做的事情并不清楚。你不需要传递所有这些参数，LinkedList id就足够了。

这样的事情： System1.java：

 import java.io.IOException;
 import java.util.LinkedList;

 //Linked lists declared to store, auctions, users, and items
 public class System1{

    private static LinkedList<User> users;

    public static void main(String[] args) throws IOException, InterruptedException {

    users = new LinkedList<User>()
    users.add(new User("user", "pw123"));
    users.add(new User("user1", "pw123"));
    users.add(new User("user2", "pw123"));

    User.validateLogIn(users);

    System.out.println("If true you are logged in:" + User.userLogedIn);
}

User.java：

import java.util.Scanner;

公共类用户{

private String userName;
private String password;
public static boolean userLogedIn;

public User(String username, String password) {
    this.userName = username;
    this.password = password;
}

public static void validateLogIn( LinkedList<User> users) {

    userLogedIn = false;

    String usernameToCheck, passwordToCheck;
    System.out.println("Enter your username: ");
    Scanner scanner = new Scanner(System.in);
    usernameToCheck = scanner.nextLine();

    System.out.println("Enter your password: ");
    passwordToCheck = scanner.nextLine();

    Iterator<User> spin = users.iterator();
    while (spin.hasNext()){
        User user = spin.next();

        //System.out.println("Searching");
        //System.out.println(username);
        String userToCheck
        if(user.userName.equals(userToCheck) && user.password.equals(passwordToCheck)) {
            //System.out.println("BINGO!");
            userLogedIn=true;
        } else {
            //return false;
            //System.out.println("User not found" + "\n");
        }
    }
}

用于身份验证的链表

1 个答案: