内部类构造失败

package innerClass;

import javax.swing.*;

import java.awt.*;
import java.awt.event.*;

import javax.swing.*;
import javax.swing.Timer;
import java.util.*;
public class InnerClass {
    public static void main(String[] args) {
        TalkingClock clock=new TalkingClock(1000, true);
        clock.start();
        JOptionPane.showMessageDialog(null, "推出程序");
        System.exit(0);
    }
}
class TalkingClock {
    private int interval;
    private boolean beep;

    public TalkingClock(int interval, boolean beep) {
        this.interval = interval;
        this.beep = beep;
    }
    public void start(){
        ActionListener listener =new TimePrinter();
        Timer t=new Timer(interval,listener);
        t.start();
    }
    public class TimePrinter implements ActionListener{
        public void actionPerfermed(ActionEvent event){
            System.out.println("At the tone,the time is "+new Date());
            if(beep) Toolkit.getDefaultToolkit().beep();
        }
    }
}