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

  1. #1
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    Default 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);
            }
        }


  2. #2
    Administrator copeg's Avatar
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    Default Re: How do I implement a login system in java using arrays

    if(username.equals(usernameArray) && password.equals(passwordArray))

    The above code compares a String object with an array of Strings...and will evaluate to false. You will need to loop over the array values individually. You can do something like set a boolean flag indicating whether the entered values are correct. You might also want to consider a different data structure than parallel arrays (for example a class that describes a user)

  3. #3
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    Default Re: How do I implement a login system in java using arrays

    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

  4. #4
    Super Moderator Norm's Avatar
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    Default Re: How do I implement a login system in java using arrays

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

  5. #5
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    Default Re: How do I implement a login system in java using arrays

    cs13, please read this before you post again: http://www.javaprogrammingforums.com...n-feeding.html
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