JavaFX Login form application

Last update on May 26 2025 13:15:26 (UTC/GMT +8 hours)

8. Login Form with Action Listener

Write a JavaFX login form. Implement an action listener on the "Login" button to validate user credentials.

Sample Solution:

JavaFx Code:

//Main.java

import javafx.application.Application;
import javafx.geometry.Insets;
import javafx.scene.Scene;
import javafx.scene.control.*;
import javafx.scene.layout.GridPane;
import javafx.stage.Stage;

public class Main extends Application {
    public static void main(String[] args) {
        launch(args);
    }

    @Override
    public void start(Stage primaryStage) {
        primaryStage.setTitle("Login Form");

        GridPane grid = new GridPane();
        grid.setHgap(10);
        grid.setVgap(10);
        grid.setPadding(new Insets(20, 20, 20, 20));

        Label usernameLabel = new Label("Username:");
        TextField usernameField = new TextField();

        Label passwordLabel = new Label("Password:");
        PasswordField passwordField = new PasswordField();

        Button loginButton = new Button("Login");
        loginButton.setOnAction(event -> {
            String username = usernameField.getText();
            String password = passwordField.getText();

            // Replace with your authentication logic here
            if (authenticate(username, password)) {
                showAlert("Login Successful", "Welcome, " + username + "!");
            } else {
                showAlert("Login Failed", "Invalid username or password.");
            }
        });

        grid.add(usernameLabel, 0, 0);
        grid.add(usernameField, 1, 0);
        grid.add(passwordLabel, 0, 1);
        grid.add(passwordField, 1, 1);
        grid.add(loginButton, 1, 2);

        Scene scene = new Scene(grid, 300, 150);
        primaryStage.setScene(scene);
        primaryStage.show();
    }

    private boolean authenticate(String username, String password) {
        // Replace with your authentication logic (e.g., database check)
        return username.equals("admin") && password.equals("pass123$");
    }

    private void showAlert(String title, String message) {
        Alert alert = new Alert(Alert.AlertType.INFORMATION);
        alert.setTitle(title);
        alert.setHeaderText(null);
        alert.setContentText(message);
        alert.showAndWait();
    }
}

Sample Output:

Flowchart:

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