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

class GUI {
    public static void main(String[] args) {
        JFrame vindu = new JFrame("Hei");
        vindu.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        JPanel panel = new JPanel();
        vindu.add(panel);

        // ---
        // Legg inn hva du vil her:
        JButton knapp = new JButton("Dette er en knapp");
        panel.add(knapp);

        JButton exitButton = new JButton("Avslutt");
        panel.add(exitButton);

        class ExitAction implements ActionListener {
            @Override
            public void actionPerformed(ActionEvent e) {
                System.out.println("Knappen ble trykket paa");
                System.exit(0);                
            }
        }
        exitButton.addActionListener(new ExitAction());

        JLabel tekstfelt = new JLabel("dette er en tekstboks");
        panel.add(tekstfelt);

        JTextField inputtboks = new JTextField("Skriv inn her!");
        panel.add(inputtboks);

        JPanel grid = new JPanel();
        grid.setLayout(new GridLayout(2, 3));
        for (int i = 0; i < 6; i++) {
            grid.add(new SmileyButton(('i' + 1) + ""));
        }
        panel.add(grid);


        // ---

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


class SmileyButton extends JButton {
    public SmileyButton(String text) {
        super(text);
        addActionListener(new SmileyTrykk());
    }


    class SmileyTrykk implements ActionListener {
        @Override
        public void actionPerformed(ActionEvent e) {
            setText(":)"); 
        }
    }

}

/*
tekst           JLabel
trykknapper     JButton
tekstfelt       JTextField og JTextPane
tegneflater     JPanel
velge fil       JFileChooser
*/