单选题 下列代码中的内部类名是______。
import java.awt.event.*;
import javax.swing.*;
class Talkingclock{
public void start (int interval, final boolean beep){
ActionListener listener=new
ActionListener(){
public void actionPerformed (ActionEvent event) {
......
}
}
Timer t=new Timer(interval, listener);
t. start();
]
}

• A. Timer
• B. ActionListener
• C. listener
• D. 匿名