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

// FlowLayout, GridLayout, BorderLayout

public class GUI {
    public static void main(String[] args) {
        try {
            UIManager.setLookAndFeel(UIManager.getCrossPlatformLookAndFeelClassName());   
        } catch (Exception e) { System.exit(1); }
        
        JFrame vindu = new JFrame("Dette er en JFrame");
        vindu.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        vindu.setLayout(new BorderLayout());
        vindu.setPreferredSize(new Dimension(600, 200));

        JPanel gridPanel = new JPanel(new GridLayout(2,2,10,10));
        //gridPanel.add(new JButton("Knapp 1"));
        //gridPanel.add(new JButton("Knapp 2"));
        //gridPanel.add(new JButton("Knapp 3"));
        //gridPanel.add(new JButton("Knapp 4"));

        gridPanel.setBorder(BorderFactory.createEmptyBorder(50, 50, 50, 50));
        for(int i = 1; i <= 4; i++) {
            JLabel label = new JLabel("Panel " + i, SwingConstants.CENTER);
            label.setFont(new Font("Serif", Font.BOLD, 20));
            gridPanel.add(label);
            label.setBackground(new Color(30 * i, 40 * i, 50 * i));
            label.setForeground(Color.WHITE);
            label.setOpaque(true);
            label.setBorder(BorderFactory.createLineBorder(Color.ORANGE, 5));
        }
        
        JPanel flowPanel = new JPanel(new FlowLayout(FlowLayout.CENTER));
        flowPanel.add(new JLabel("FlowLabel"));
        flowPanel.add(new JTextField(10));

        vindu.add(gridPanel, BorderLayout.NORTH);
        vindu.add(flowPanel, BorderLayout.SOUTH);

        vindu.pack();
        vindu.setLocationRelativeTo(null); 
        vindu.setVisible(true);
    }
}