How To Make Login Page In Java Using Notepad

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Vector Linux
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As a developer, one of the fundamental tasks is to design and implement a login page for an application. In this article, I will guide you through the process of creating a login page in Java using Notepad. By following this step-by-step tutorial, you will be able to build a functional login page from scratch.

Setting Up the Environment

Before we dive into the coding part, let’s make sure we have the necessary tools set up on our system. To create a login page in Java, we will need to install the Java Development Kit (JDK) and a text editor like Notepad or Notepad++.

To install the JDK, follow these steps:

  1. Go to the Oracle website and download the latest version of the JDK.
  2. Run the installer and follow the on-screen instructions to complete the installation.
  3. Once the installation is complete, open the command prompt and type java -version to verify that the JDK has been successfully installed.

Creating the Login Page

Now that we have the necessary environment set up, we can start building our login page. Open Notepad and create a new file. Save it with a .java extension, for example, LoginPage.java.

To create the login page, we need to write Java code that contains a graphical user interface (GUI) using the Swing library. Here’s an example of how the code should look:


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

public class LoginPage extends JFrame implements ActionListener {
private JTextField usernameField;
private JPasswordField passwordField;
private JButton loginButton;

public LoginPage() {
setTitle("Login Page");
setSize(300, 200);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

JLabel usernameLabel = new JLabel("Username:");
usernameField = new JTextField();

JLabel passwordLabel = new JLabel("Password:");
passwordField = new JPasswordField();

loginButton = new JButton("Login");
loginButton.addActionListener(this);

setLayout(new FlowLayout());
add(usernameLabel);
add(usernameField);
add(passwordLabel);
add(passwordField);
add(loginButton);

setVisible(true);
}

public void actionPerformed(ActionEvent e) {
if (e.getSource() == loginButton) {
String username = usernameField.getText();
String password = new String(passwordField.getPassword());

if (username.equals("admin") && password.equals("password")) {
JOptionPane.showMessageDialog(this, "Login successful!");
} else {
JOptionPane.showMessageDialog(this, "Invalid username or password!");
}
}
}

public static void main(String[] args) {
new LoginPage();
}
}

Save the file and compile it using the command prompt. Use the following command:


javac LoginPage.java

Running the Login Page

After successfully compiling the code, we can run the login page by executing the following command:


java LoginPage

The login page window will appear on your screen. You can enter a username and password, and then click the “Login” button. If the credentials match the hardcoded values in the code (“admin” and “password”), a success message will be displayed. Otherwise, an error message will be shown.

Conclusion

Creating a login page in Java using Notepad may seem like a daunting task at first, but by following this tutorial, you should now have a good understanding of the process. Remember to save the file with a .java extension, compile it using the javac command, and run it using the java command. Feel free to customize the login page to suit your needs and add additional functionality. Happy coding!