Question

我用一些“预设”用户创建了一个登录系统。我想更改代码，以便能够在系统内部创建新用户并将其添加到我的用户列表中。我怎样才能做到这一点？我是Java的初学者，因此将不胜感激。

LoginSystem类：

    package logpack;

    import java.util.ArrayList;
    import java.util.Scanner;

    public class LoginSystem {
    ArrayList<User> users = new ArrayList<User>();

    public boolean run() {

        Scanner keyboard = new Scanner(System.in);

        System.out.println("Enter username: ");
        String inpUser = keyboard.nextLine();
        System.out.println("Enter password: ");
        String inpPass = keyboard.nextLine(); // gets input from user

        boolean loginSuccess = false;

        for (User temp : users) {
            if (inpUser.equals(temp.getUsername()) && inpPass.equals(temp.getPassword())) {

                System.out.println("Welcome " + temp.getName() + " to the System.");
                loginSuccess = true;
                break;

            } else {
                loginSuccess = false;
            }
        }

        if (loginSuccess == false) {
            System.out.println("Incorrect Input, Try again.");
        }
        return loginSuccess;

    }

    public void saveUser(User US) {
        users.add(US);
    }

    public ArrayList<User> getUsers() {
        return users;
    }

}

用户类别：

    package logpack;

    public class User {
    String name;
    String username;
    String password;

    public User(String name, String username, String password) {

        this.username = username;
        this.password = password; 
        this.name = name;
    }
     protected String getName() {
         return name;
     }

     protected void setName(String name) {
         this.name = name; 
     }

     protected String getUsername() {
         return username;
     }
     protected void setUsername (String username) {
         this.username = username;

     }

     protected String getPassword() {
         return password;
     }
     protected void setPassword (String password) {
         this.password = password;
     }

}

RunClass类（我必须更改以创建一种“注册”系统的类）：

package logpack;


public class RunClass {

    public static void main(String[] args) {

        LoginSystem LGS = new LoginSystem();
        System.out.println("Enter username: ");


        ////////
        User u1 = new User("Daria", "Daria5", "12345");
        User u2 = new User("Bob", "Bob8989 ", "Bob64748od7");
        User u3 = new User("Samanta", "Sam764", "678303");
        User u4 = new User("Dog", "Doggy998621", "C6574");
        User u5 = new User("Doughnut", "DBghf", "pae102938");


        LGS.saveUser(u1);
        LGS.saveUser(u2);
        LGS.saveUser(u3);
        LGS.saveUser(u4);
        LGS.saveUser(u5);
        ///////
        /*Can you replace this section above with a loop and method that asks
        * the user if they want to create a new user account? As many as they want?
        * This is inefficient as we have to write many lines to create many users.
        * It does mean that we always have users to start with to simulate
        * having a save file.
        */

        LGS.run();
        //System.out.println("User list: "+LGS.users);

    }

}

非常感谢您的帮助！

Answer 1

在您的主类中，与其提示用户输入用户名，不如提示用户一系列选项，然后用户选择登录名或注册名，例如：

public static void main(String[] args) {
    // create a scanner to read the command-line input
    Scanner scanner = new Scanner(System.in);

    int optionSelected;

    do {
        System.out.println("Select 1 for Login");
        System.out.println("Select 2 for User Registration");
        System.out.println("Select 3 to Exit");
        System.out.print("Enter selected option: ");
        optionSelected = scanner.nextInt();

        if(optionSelected == 1){
            // proceed with login
            System.out.println("Login in progress\n");
        } else if (optionSelected == 2){
            // proceed with registration
            System.out.println("Registration in progress\n");
        }
    } while (optionSelected != 3);
}

这不是世界上最好的代码，但是它将帮助您。目前只有3个选项，以后您可以添加更多选项。

Java登录系统：在登录系统中创建新用户

1 个答案: