import java.awt.*;
import java.awt.event.*;

class KnapLytter implements ActionListener {
  public void actionPerformed(ActionEvent e) {
    System.out.println("Tak!");
  }
}

class LytKnap {
  public static void main(String args[]) {
    Frame f = new Frame("Tryk på knappen");
    f.setLayout(new FlowLayout());
    
    Button b = new Button("Tryk her");
    b.addActionListener(new KnapLytter());
    f.add(b);

    f.pack();
    f.show();
  }
}