How to create parallel arrays

Is it sth like this

int grades[][] = {} ?

I manage to figure out

Code:

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String table[][] = {{"Vani", "Vicknes", "Kamala", "Vimal", "Bala"},
                      {"Vani1234", "Vick1234", "Kam1234", "Vimal90", "Bala62"}};

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Now how am i to check against the array table with the login id and password i have keyed in to validate that its correct?

Code:

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import java.awt.*;
import javax.swing.*;
import java.awt.event.*;

public class AccountLogin extends JFrame
{
    String table[][] = {{"Vani", "Vicknes", "Kamala", "Vimal", "Bala"},
                      {"Vani1234", "Vick1234", "Kam1234", "Vimal90", "Bala62"}};
//    String array2[] = {"Vani1234", "Vick1234", "Kam1234", "Vimal90", "Bala62"};
    private JLabel lblAccountId;
    private JTextField txtAccountId;
    private JLabel lblPassword;
    private JTextField txtPassword;
    private JButton btnLogin;
    private JLabel lblOutPut;
  // private char echochar = '*';
   
    public AccountLogin()
    {
      lblAccountId = new JLabel("Account ID");
      txtAccountId = new JTextField(15);
      lblPassword = new JLabel("Password");
      txtPassword = new JTextField(10);
      //txtPassword.setEchoChar('*');
      btnLogin = new JButton("Login");
      btnLogin.addActionListener(new MyListener());
      lblOutPut = new JLabel();
     
      JPanel panel = (JPanel)getContentPane();
      panel.setLayout(new FlowLayout());
      panel.add(lblAccountId);
      panel.add(txtAccountId);
      panel.add(lblPassword);
      panel.add(txtPassword);
      panel.add(btnLogin);
      panel.add(lblOutPut);
      setSize(300,200);
      setTitle("Vanisri");
      setVisible(true);


    }
   
    private class MyListener implements ActionListener{
        public void actionPerformed(ActionEvent e){
           
            lblOutPut.setText("Welcome Vani");
        }
    }
   
    public static void main(String[] args)
    {
        new AccountLogin();
    }
   
   
}

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use two loops to scan [][] array ;)

Code:

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for(...)
{
for(...){}
}

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Quote:

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Originally Posted by Webuser

use two loops to scan [][] array ;)

Code:

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for(...)
{
for(...){}
}

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The OP wants to check for a valid combination of a login name and a corresponding password. A single loop would be enough and please don't beg for rep points.

kind regards,

Jos

Can u give me an example on how to do it?

Quote:

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Originally Posted by Roselicious

Can u give me an example on how to do it?

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Given your table[][] matrix, a possible user name and a password the following simple method checks whether or not the user name exists and if the password is valid:

Code:

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public boolean check(String user, String password) {
  for (int i= 0; i < table[0].length; i++)
      if (table[0][i].equals(user))
        return table[1][i].equals(password);
  return false;
}

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As you can see a single loop can do it: it checks all usernames until one is found; next it checks the corresponding password and returns true if they match, false otherwise.

kind regards,

Jos