Swing JPopupMenu有关问题

Swing JPopupMenu问题
关于Swing JPopupMenu的选择项返回值问题。。

Java code

JMenuItem copy = new JMenuItem("コピー");JMenuItem paste = new JMenuItem("貼り付け");copy.setEnabled(true);peast.setEnabled(true);            popupmenu.add(copy);popupmenu.add(paste);popupmenu.show(e.getComponent(), e.getX(), e.getY());popupmenu.addPopupMenuListener(new PopupMenuListener() {    public void popupMenuCanceled(PopupMenuEvent arg0) {}    public void popupMenuWillBecomeInvisible(PopupMenuEvent arg0) {                                    //我想在这里获得Popup选择的项                  //如果选择Copy返回个东东                  //如果选择paste也返回一个东西        if (Copy){                      //............................                   }                   if (paste){                      //............................                   }    }    public void popupMenuWillBecomeVisible(PopupMenuEvent arg0) {}                        });

Java code

final JMenuItem copy = new JMenuItem("コピー");final JMenuItem paste = new JMenuItem("貼り付け");copy.setEnabled(true);peast.setEnabled(true);  ActionListener listener = new ActionListener() {  @Override  public void actionPerformed(ActionEvent e) {      Object source = e.getSource();    if( source == copy ) {            // ...    }    else if( source == paste ) {      // ...    }  }}copy.addActionListener(listener);paste.addActionListener(listener);popupmenu.add(copy);popupmenu.add(paste);// ...