Bin newbie und finde den Fehler net

[LittleWulf]

Hi Leutz,
kan mir da jemand helfen?

package Anfang;

import java.awt.*;
import java.awt.event.*;
/**
 * @author LittleWulf
 *
 */
public class Grafiken extends Frame implements ActionListener {
Button bt1, bt2;
Canvas cv;

public Grafiken (){
cv = new Canvas();
   cv.setBounds(50,100,200,300);
   cv.setBackground(Color.yellow);
   add (cv);
setLayout (new FlowLayout());
bt1 = new Button ("Kreis");
  add (bt1);
bt1.addActionListener (this);
bt2 = new Button ("Gerade");
  add (bt2);
bt2.addActionListener (this);
  initComponenets ();
}
private void initComponenets ()
 {
  addWindowListener (new WindowAdapter (){
   public void windowClosing (WindowEvent ev){
    exitForm(ev);}});
  pack ();}

private void exitForm (WindowEvent ev) {
  System.exit(0);}

public static void main(String[] args) {
  Grafiken toll = new Grafiken ();
    toll.setLocation (100,100);
    toll.setSize (350,380);
    toll.show ();
 }

public void kreis(int xm,int ym,int r){
 Graphics  g = cv.getGraphics();
    g.setColor(Color.white);
 int x1 = xm - r;
 int y1 = xm - r;
    g.drawOval(x1,y1,2*r,2*r);
    g.dispose();}

public void maleGerade (int x1,int y1,int x2,int y2){
 Graphics g = cv.getGraphics();
  g.setColor(Color.red);
  for(int i = 1;i<10;i++)
  g.drawLine(i*x1,i*y1,x2,y2);
  g.dispose();}

public void actionPerfomed(ActionEvent e){
 if(e.getSource()==bt1) kreis(50,20,100);
 if(e.getSource()==bt2) maleGerade(10,20,100,200);
}
}

Und Fehler zeigt er des:

java.lang.Error: Unresolved compilation problem:
 Class must implement the inherited abstract method ActionListener.actionPerformed(ActionEvent)

at Anfang.Grafiken.actionPerformed(Grafiken.java:13)
 at java.awt.Button.processActionEvent(Unknown Source)
 at java.awt.Button.processEvent(Unknown Source)
 at java.awt.Component.dispatchEventImpl(Unknown Source)
 at java.awt.Component.dispatchEvent(Unknown Source)
 at java.awt.EventQueue.dispatchEvent(Unknown Source)
 at java.awt.EventDispatchThread.pumpOneEventForHierarchy(Unknown Source)
 at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
 at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
 at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
 at java.awt.EventDispatchThread.run(Unknown Source)