enableEvents(AWTEvent.WINDOW_EVENT_MASK)请问这是什么意思？

[ztpia]

部份程序：
public class Frame1 extends JFrame {
public Frame1() {
enableEvents(AWTEvent.WINDOW_EVENT_MASK);
try {
jbInit();
}
catch(Exception e) {
e.printStackTrace();
}
}
｝
源程序如下：
package emptyframe;

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

public class Frame1 extends JFrame {
JPanel contentPane;
JMenuBar jMenuBar1 = new JMenuBar();
JMenu jMenuFile = new JMenu();
JMenuItem jMenuFileExit = new JMenuItem();
JMenu jMenuHelp = new JMenu();
JMenuItem jMenuHelpAbout = new JMenuItem();
JToolBar jToolBar = new JToolBar();
JButton jButton1 = new JButton();
JButton jButton2 = new JButton();
JButton jButton3 = new JButton();
ImageIcon image1;
ImageIcon image2;
ImageIcon image3;
JLabel statusBar = new JLabel();
BorderLayout borderLayout1 = new BorderLayout();

//Construct the frame
public Frame1() {
enableEvents(AWTEvent.WINDOW_EVENT_MASK);
try {
jbInit();
}
catch(Exception e) {
e.printStackTrace();
}
}
//Component initialization
private void jbInit() throws Exception {

image1 = new ImageIcon(emptyframe.Frame1.class.getResource("/openFile.png"));
image2 = new ImageIcon(emptyframe.Frame1.class.getResource("/closeFile.png"));
image3 = new ImageIcon(emptyframe.Frame1.class.getResource("/help.bmp"));

contentPane = (JPanel) this.getContentPane();
contentPane.setLayout(borderLayout1);
this.setSize(new Dimension(400, 300));
this.setTitle("Frame Title");
statusBar.setText(" ");
jMenuFile.setText("File");
jMenuFileExit.setText("Exit");
jMenuFileExit.addActionListener(new Frame1_jMenuFileExit_ActionAdapter(this));
jMenuHelp.setText("Help");
jMenuHelpAbout.setText("About");
jMenuHelpAbout.addActionListener(new Frame1_jMenuHelpAbout_ActionAdapter(this));
jButton1.setIcon(image1);
jButton1.setToolTipText("Open File");
jButton2.setIcon(image2);
jButton2.setToolTipText("Close File");
jButton3.setIcon(image3);
jButton3.setToolTipText("Help");
jToolBar.add(jButton1);
jToolBar.add(jButton2);
jToolBar.add(jButton3);
jMenuFile.add(jMenuFileExit);
jMenuHelp.add(jMenuHelpAbout);
jMenuBar1.add(jMenuFile);
jMenuBar1.add(jMenuHelp);
this.setJMenuBar(jMenuBar1);
contentPane.add(jToolBar, BorderLayout.NORTH);
contentPane.add(statusBar, BorderLayout.SOUTH);
}
//File | Exit action performed
public void jMenuFileExit_actionPerformed(ActionEvent e) {
System.exit(0);
}
//Help | About action performed
public void jMenuHelpAbout_actionPerformed(ActionEvent e) {
Frame1_AboutBox dlg = new Frame1_AboutBox(this);
Dimension dlgSize = dlg.getPreferredSize();
Dimension frmSize = getSize();
Point loc = getLocation();
dlg.setLocation((frmSize.width - dlgSize.width) / 2 + loc.x, (frmSize.height - dlgSize.height) / 2 + loc.y);
dlg.setModal(true);
dlg.pack();
}
//Overridden so we can exit when window is closed
protected void processWindowEvent(WindowEvent e) {
super.processWindowEvent(e);
if (e.getID() == WindowEvent.WINDOW_CLOSING) {
jMenuFileExit_actionPerformed(null);
}
}
}

class Frame1_jMenuFileExit_ActionAdapter implements ActionListener {
Frame1 adaptee;

Frame1_jMenuFileExit_ActionAdapter(Frame1 adaptee) {
this.adaptee = adaptee;
}
public void actionPerformed(ActionEvent e) {
adaptee.jMenuFileExit_actionPerformed(e);
}
}

class Frame1_jMenuHelpAbout_ActionAdapter implements ActionListener {
Frame1 adaptee;

Frame1_jMenuHelpAbout_ActionAdapter(Frame1 adaptee) {
this.adaptee = adaptee;
}
public void actionPerformed(ActionEvent e) {
adaptee.jMenuHelpAbout_actionPerformed(e);
}
}
请问下，这里面的 enableEvents(AWTEvent.WINDOW_EVENT_MASK);
emptyframe.Frame1.class.getResource("/openFile.png")，class和/　是什么意思了？

[yuzl32]

看文档先.: )

[ztpia]

A:Enables the events defined by the specified event mask parameter to be delivered to this component.

B:Event types are automatically enabled when a listener for that event type is added to the component.

C:This method only needs to be invoked by subclasses of Component which desire to have the specified event types delivered to processEvent regardless of whether or not a listener is registered.
小弟英文有限，请问，A是不是解释enableEvents(AWTEvent.WINDOW_EVENT_MASK);是用来为Frame添加一种窗口事件。B解释说，要是没有enableEvents(AWTEvent.WINDOW_EVENT_MASK);这样一句话
，只要有addActionListener（）方法，窗口也就拥有了这样的方法。