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

class Ruter{
  public static void main(String[] args){
    //Setter opp vindu
    JFrame vindu = new JFrame("Ruter");
    vindu.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

    JPanel hovedPanel = new JPanel();
    vindu.add(hovedPanel);
    hovedPanel.setLayout(new GridLayout(2,1));
    //Setter opp panel, og legger det til i vindu
    JPanel panel = new JPanel();
    hovedPanel.add(panel);

    JPanel panel2 = new JPanel();
    hovedPanel.add(panel2);

    JTextField textF = new JTextField("Halla");

    panel2.add(textF);

    NyKnapp b1=new NyKnapp("1");
    NyKnapp b2=new NyKnapp("2");
    NyKnapp b3=new NyKnapp("3");
    NyKnapp b4=new NyKnapp("4");
    NyKnapp b5=new NyKnapp("5");
    NyKnapp b6=new NyKnapp("6");

    panel.add(b1);
    panel.add(b2);
    panel.add(b3);
    panel.add(b4);
    panel.add(b5);
    panel.add(b6);

    panel.setLayout(new GridLayout(2,3));

    //"Pakker" og gjoer vindu synlig
    vindu.pack();
    vindu.setVisible(true);
  }

  static class NyKnapp extends JButton{
    String original;
    public NyKnapp(String s){
      super(s);
      original = s;
      addActionListener(new Velger());
    }

    class Velger implements ActionListener{
      @Override
      public void actionPerformed(ActionEvent e){
        System.out.println(e.paramString());
        if(!getText().equals(":)")){
          setText(":)");
        }
        else{
          setText(original);
        }

      }
    }
  }



}