Por favor me ajudem, o que está errado:
import java.awt.<em>;
import java.awt.event.</em>;
import javax.swing.*;
public class Calculadora extends JFrame implements ActionListener {
.
.
.
JDK 5.0
Eclipse 3.2.0
No Eclipse:
the serializable class Calculadora does not declare a static final serialVersionUID field of type long
the type Calculadora must implement the inherited abstract method ActionListener.actionPerformed(ActionEvent)
no prompt:
Calculadora is not abstract and does not override abstract method actionPerformed(java.awt.event.ActionEvent) in java.awt.event.ActionListen

Desde já agradeço a quem puder me ajudar.