import javax.swing.*; // Import Swing for UI parts
import java.awt.*; // Import AWT for Layout managers

public class LayoutOrganizer { // Define class to showcase UI layout management
    public static void main(String[] args) { // Main entry point
        JFrame frame = new JFrame("Grid-Border Layout Demo"); // Create the main window frame
        frame.setSize(350, 450); // Set window height and width
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); // Ensure process ends on close
        
        frame.setLayout(new BorderLayout(5, 5)); // Set the main frame to use Border layout with gaps
        
        JTextField display = new JTextField("0"); // Create a mock calculator display field
        display.setFont(new Font("Monospaced", Font.BOLD, 28)); // Style the font for the display
        display.setHorizontalAlignment(JTextField.RIGHT); // Align the text to the right side
        frame.add(display, BorderLayout.NORTH); // Put the display at the top of the frame
        
        JPanel buttonPanel = new JPanel(); // Create a panel to hold a grid of buttons
        buttonPanel.setLayout(new GridLayout(4, 4, 5, 5)); // Set the panel to a 4x4 grid with spacing
        
        String[] keys = {"7", "8", "9", "/", "4", "5", "6", "*", "1", "2", "3", "-", "0", "C", "=", "+"}; // Define button labels
        for (String k : keys) { // Loop through the labels array
            JButton b = new JButton(k); // Create a new button for each label
            b.setFont(new Font("Arial", Font.BOLD, 18)); // Style the button text
            buttonPanel.add(b); // Add the button to the grid panel
        } // End of button creation loop
        
        frame.add(buttonPanel, BorderLayout.CENTER); // Put the button grid in the center area
        
        JLabel footer = new JLabel("Calculator Layout Prototype", JLabel.CENTER); // Create a status label
        frame.add(footer, BorderLayout.SOUTH); // Put the label at the bottom of the frame
        
        frame.setLocationRelativeTo(null); // Center the window on the screen
        frame.setVisible(true); // Make the final UI visible
        
        System.out.println("Layout Lab: Calculator UI Rendered."); // Final log for layout lab
    } // End of main method
} // End of LayoutOrganizer class