问无法使用ActionListener

EN

    error: cannot find symbol
        private class ConvertButtonListener implements ActionListener {
      symbol:   class ActionListener
      location: class KiloConverter
    java:37: error: cannot find symbol
            public void actionPerformed(ActionEvent e){
      symbol:   class ActionEvent
      location: class KiloConverter.ConvertButtonListener
    cannot be converted to ActionListener
            convertButton.addActionListener(new ConvertButtonListener());
    Note: Some messages have been simplified; recompile with -Xdiags:verbose to get full output
    3 errors
   The following error occurred while executing this line:
    Compile failed; see the compiler error output for details.
    BUILD FAILED (total time: 1 second)

package myframe;
import javax.swing.*;

public class MyFrame {

    public static void main(String[] args) {
        JFrame frame = new JFrame("MyFrame");
        frame.setSize(500,500);
        frame.setLocationRelativeTo(null);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setVisible(true);
        frame.setTitle("My First Frame");
        
        
        
    }
    
}

package myframe;
import java.awt.*;
import javax.swing.*;

public class KiloConverter extends JFrame {
    private JPanel panel; 
    private JButton convertButton;
    private JLabel Label;
    private JTextField kiloTextField;
    final int WINDOW_WIDTH = 400;
    final int WINDOW_HEIGHT = 150;
    
    //Constructor
    public KiloConverter() {
        setTitle("Kilometer Converter");
        setSize(WINDOW_WIDTH, WINDOW_HEIGHT);
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        buildPanel();
        add(panel);
        setLocationRelativeTo(null);
        setVisible(true);
        
    }
    
    private void buildPanel(){
        panel = new JPanel();
        Label = new JLabel("Enter the distance in kilo");
        kiloTextField = new JTextField(10);
        convertButton = new JButton("Convert");
        convertButton.addActionListener(new ConvertButtonListener());
        panel.add(Label);
        panel.add(kiloTextField);
        panel.add(convertButton);
    }
    
    private class ConvertButtonListener implements ActionListener {
        public void actionPerformed(ActionEvent e){
            final double conversion = 0.6214;
            String input;
            double miles;

            input = kiloTextField.getText();
            miles = Double.parseDouble(input) * conversion;
            JOptionPane.showMessageDialog(null, input+" Kilometer is equal to " + miles +" in miles.");
        }
    }
    

    public static void main(String[] args){
        new KiloConverter();
        
    }
    
}