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

class Login extends JFrame implements ActionListener
{
JButton b = new JButton("Login");
JButton b1 = new JButton("Register");
JLabel l = new JLabel("Username");
JLabel l1 = new JLabel("Password");
JTextField f = new JTextField();
JTextField f1 = new JTextField();
User u[] = new User[5];

public Login(User u[])
{
    this.u = u;
    setSize(600,600);
    setVisible(true);
    setLayout(null);

    b.setBounds(400,350,90,40);
    add(b);

    b1.setBounds(200,350,90,40);
    add(b1);

    l.setBounds(100,150,100,20);
    add(l);

    l1.setBounds(100,250,100,20);
    add(l1);

    f.setBounds(250,150,200,25);
    add(f);

    f1.setBounds(250,250,200,25);
    add(f1);

    b.addActionListener(this);
    b1.addActionListener(this);
}

String userName,password;

public void actionPerformed(ActionEvent a)
{
    if(a.getSource() == b)
    {
        userName = f.getText();
        password = f1.getText();

            if(userName.equals(u[0].getUserName()) && password.equals(u[0].getPassword()))
            {
                this.setVisible(false);
                JFrame f = new JFrame("WELCOME");
                f.setSize(1280,720);
                f.setVisible(true);
                WelcomeScreen w = new WelcomeScreen("Welcome.jpg");
                f.add(w);
            }
            else
            {
                LoginFailedScreen s = new LoginFailedScreen();
            }
    }
    else
    {
        this.setVisible(false);
        Registration r = new Registration();
    }
}
}

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

class Registration extends JFrame implements ActionListener
{
static int count = -1;
User n[] = new User[5];
JButton b = new JButton("Cancel");
JButton b1 = new JButton("Submit");

JLabel l = new JLabel("First Name");
JLabel l1 = new JLabel("Last Name");
JLabel l2 = new JLabel("User Name");
JLabel l3 = new JLabel("Password");
JLabel l4 = new JLabel("Confirm Password");
JLabel l5 = new JLabel("Email");
JLabel l6 = new JLabel("Contact No");

JTextField t = new JTextField();
JTextField t1 = new JTextField();
JTextField t2 = new JTextField();
JTextField t3 = new JTextField();
JTextField t4 = new JTextField();
JTextField t5 = new JTextField();
JTextField t6 = new JTextField();

public Registration()
{
    setSize(600,600);
    setVisible(true);
    setLayout(null);

    l.setBounds(55,80,100,25);
    add(l);

    l1.setBounds(55,120,100,25);
    add(l1);

    l2.setBounds(55,160,100,25);
    add(l2);

    l3.setBounds(55,200,100,25);
    add(l3);

    l4.setBounds(55,240,150,25);
    add(l4);

    l5.setBounds(55,280,100,25);
    add(l5);

    l6.setBounds(55,320,100,25);
    add(l6);

    t.setBounds(250,80,200,23);
    add(t);

    t1.setBounds(250,120,200,23);
    add(t1);

    t2.setBounds(250,160,200,23);
    add(t2);

    t3.setBounds(250,200,200,23);
    add(t3);

    t4.setBounds(250,240,200,23);
    add(t4);

    t5.setBounds(250,280,200,23);
    add(t5);

    t6.setBounds(250,320,200,23);
    add(t6);

    b.setBounds(200,400,100,30);
    add(b);

    b1.setBounds(350,400,100,30);
    add(b1);

    b.addActionListener(this);
    b1.addActionListener(this);
}

String first,last,user,pass,mail,contact;
String confirmPass;

public void actionPerformed(ActionEvent a)
{
    if(a.getSource() == b)
    {
        this.setVisible(false);
        Login k = new Login(n);
    }
    else
    {
        first = t.getText();
        last = t1.getText();
        user = t2.getText();
        pass = t3.getText();
        confirmPass = t4.getText();
        mail = t5.getText();
        contact = t6.getText();

        if(first.equals("") || last.equals("") || user.equals("") || pass.equals("") || confirmPass.equals("") || mail.equals("") || contact.equals(""))
        {
            TextFieldEmpty t = new TextFieldEmpty();
        }
        else
        {
            if(pass.equals(confirmPass))
            {
                count++;
                n[count] = new User(first,last,user,pass,mail,contact);
                this.setVisible(false);
                Login s = new Login(n);
                RegistrationConfirmedScreen m = new RegistrationConfirmedScreen();
            }
            else
            {
                PasswordNotMatchScreen p = new PasswordNotMatchScreen();
            }
        }
    }
}
}

class Main
{
public static void main(String args[])
{
    Login n = new Login(null);
}
}

User u[] = new User[5];