Question

String menu = JOptionPane.showInputDialog("Enter 'LOGIN', 'REGISTER', or 'EXIT'");
        if (menu.equalsIgnoreCase("login") || menu.equalsIgnoreCase("l"))
        {
            String username = JOptionPane.showInputDialog ("Please enter your username.");
            String pinS = JOptionPane.showInputDialog ("Please enter your PIN.");

            /* Want to call other class and pass username and pinS
            if (LoginVerification (username, pinS) == 1)
                   loggedIn = true;
            else
                   JOptionPane.showMessageDialog (null, "Account/PIN not found/doesn't match.");
            */
        }

这是名为Startup.java的主类的一部分这是另一个名为LoginVerication.java的类

package bankbalance;

import java.io.*;
import java.util.Scanner;
import javax.swing.JOptionPane;

public class LoginVerification
{
    public void loginVerification (username, pin)
    {
        boolean usernameFound = false, pinMatches = false;
        try
        {
            Scanner fileReader = new Scanner (new FileReader ("accounts.txt"));

            while (fileReader.hasNextLine() && !usernameFound)
            {
                usernameFound = fileReader.nextLine().indexOf(username) >= 0; // want username to be passed from other class
            }
            pinMatches = fileReader.nextLine().indexOf(pin) >= 0; // want pin to be passed from other class

            if (usernameFound && pinMatches)
            {
               return 1; // return 1 to other class
            }

            else
            {
                return 0; // return 0 to other class
            }
        }

        catch (FileNotFoundException z)
       {
            JOptionPane.showMessageDialog (null, "No Accounts found. Please register a new account.");
        }

    }
}

我该如何正确地做到这一点？我希望从Startup.java调用LoginVerification.java，如果找到用户名并且引脚与用户名匹配，则返回1。谢谢！

Heres the full Startup.java

Answer 1

public class LoginVerification {

public static int check(String username, String pin) {
    boolean usernameFound = false, pinMatches = false;
    try {
        Scanner fileReader = new Scanner(new FileReader("accounts.txt"));

        while (fileReader.hasNextLine() && !usernameFound) {
            usernameFound = fileReader.nextLine().indexOf(username) >= 0; // want username to be passed from other class
        }
        pinMatches = fileReader.nextLine().indexOf(pin) >= 0; // want pin to be passed from other class

        if (usernameFound && pinMatches) {
            return 1; // return 1 to other class
        }

        else {
            return 0; // return 0 to other class
        }
    }

    catch (FileNotFoundException z) {
        JOptionPane.showMessageDialog(null, "No Accounts found. Please register a new account.");
        return 0;
    }

    }
}

并在调用代码中：

      if (LoginVerification.check (username, pinS) == 1)
               loggedIn = true;
        else
               JOptionPane.showMessageDialog (null, "Account/PIN not found/doesn't match.");

Answer 2

if (LoginVerification.loginVerfication(username, pinS) == 1)

这应该有效。您应该创建方法static，因为它似乎不依赖于任何特定实例。

我需要将info传递给一个类，然后返回Java中的主类

2 个答案: