MyApp.MyListListener is not abstract and does not override abstract method actionPerformed(ActionEvent) in ActionListener

Below error means that the spelling of actionPerformed method is incorrect.

MyApp.java:100: error: MyApp.MyListListener is not abstract and does not override abstract method actionPerformed(ActionEvent) in ActionListener

public class MyListListener implements ActionListener {
public void actionPeformed(ActionEvent ev) {

See the spelling of actionPerformed. It is incorrect.