Swing中要响应动作事件必须实现ActionListener接口，而实现ActionListenrer接口必须实现的方法是 ( )。
A:actionPerfonned() B:focusGained() C:actionMoved() D:focusLost()
Swing中要响应动作事件必须实现ActionListener接口，而实现ActionListenrer接口必须实现的方法是 ( )。
A:actionPerformed() B:focusGained() C:actionMoved() D:focusLost()
下列代码中的内部类名是( )。
import java.awt.event.*;
lapoct 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
下列程序实现了2个__接口：ActionListener和W1ndowListener。 import java.awt.*; import java.awt.event.*; public class ex39______ { public static void main(String[] args) { ex39 obj = new ex39（ ）; obj .go（ ）; } public void go（ ） { Frame f = new Frame("ex39"); f.addWindowListener(this); Button b = new Button("Button"); b.addActionListener(this); f.add(b); f.pack（ ）; f.setVisible(true); } public void actionPerformed(ActionEvent e) { System.out.println("Button pressed!"); } public void windowActivated(WindowEvent e){} public void windowDeactivated(WindowEvent e){} public void windowClosed(WindowEvent e) {} public void windowClosing(WindowEvent e){System.exit(1); public void windowIconified(WindowEvent e){} public void windowDeiconified(WindowEvent e) {} public void windowOpened(WindowEvent e){} } 请选择正确的语句填入横线处。
A:extends ActionListener, WindowListener B:implements ActionListener, WindowListener C:implements ActionListener; WindowListener D:extends ActionListener; WindowListener
下面代码中的内部类名是
import java.awt*;
import javax.swing.*;
class TalkingClock {
public static void main(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
下面代码中的内部类名是（）。
import java.awt*;
import javax.swing.*;
class TalkingClock
public static void main(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
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
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