Thread: How do I implement a login system in java using arrays

I did this in Visual Basic a couple of years back. What I'm doing here is creating a login system.
I have three users and three password respectively.
i.e. (Username) John - (Password) jMan21 , (Username) Mary - (Password) maree34 , (Username) Luke - (Password) skywalker.
At first I used the loop function but what it would do is cycle through all the arrays (obviously) and processed dialog boxes 3 times, one saying the login is successful and the other saying the login attempt has failed.
And I also used the "Array.equals" method.

This is the code I used:

package loginPackage;
 
import java.util.*;
import javax.swing.*;
 
public class userInterface extends javax.swing.JFrame {
 
    String username="";
    String password="";
    String logZone;
 
 
 
 
    public userInterface() {
        initComponents();
    }
 
    private void jBtnEnterActionPerformed(java.awt.event.ActionEvent evt) {                                          
        username = jTxtFieldUser.getText();
        password = jPassFieldPassword.getText();
        logZone = (String) jCbxLogZone.getSelectedItem();
 
        String[] usernameArray={"John","Mary","Luke"};
        String[] passwordArray={"jMan21","maree34","skywalker"};
 
        if(username.equals(usernameArray) && password.equals(passwordArray))
        {
            JOptionPane.showMessageDialog(null,"Welcome "+username+"\n"+"You are logged in as: "+logZone,"Log in",JOptionPane.INFORMATION_MESSAGE);
        }
        else{
JOptionPane.showMessageDialog(null,"Incorrect login or password","Error",JOptionPane.ERROR_MESSAGE);
        }
    }

package loginPackage;

import java.util.*;
import javax.swing.*;

public class userInterface extends javax.swing.JFrame {

String username="";
String password="";
String logZone;




public userInterface() {
initComponents();
}

private void jBtnEnterActionPerformed(java.awt.event.ActionEven t evt) {
username = jTxtFieldUser.getText();
password = jPassFieldPassword.getText();
logZone = (String) jCbxLogZone.getSelectedItem();

String[] usernameArray={"John","Mary","Luke"};
String[] passwordArray={"jMan21","maree34","skywalker"};

if((username.equals(usernameArray[i]) && password.equals(passwordArray[i])) || (username.equals(usernameArray[++i]) && password.equals(passwordArray[i]))||(username.equals(usernameArray[++i]) && password.equals(passwordArray[i])) )
{
JOptionPane.showMessageDialog(null,"Welcome "+username+"\n"+"You are logged in as: "+logZone,"Log in",JOptionPane.INFORMATION_MESSAGE);
}
else{
JOptionPane.showMessageDialog(null,"Incorrect login or password","Error",JOptionPane.ERROR_MESSAGE);
}
}

hope this will work fine for you

Please don't post junk code. You'll only confuse the OP.