import java.applet.*;
import java.awt.*;
import java.awt.event.*;  //für actionPerformed,ActionListener

public class halloapp3 extends Applet implements ActionListener{
String text;
Button btn;
  public void init(){
    text = getParameter("text");
    btn = new Button("Start");
    add(btn);
    btn.addActionListener(this);
  }
  public void paint(Graphics g){
    g.drawString(text,180,100);
  }
  public void actionPerformed(ActionEvent ae){
    if (ae.getSource()==btn){
      text="Der Button wurde gedrückt";
      repaint(); //Aufruf von paint(Graphics g)
    }
  }
}