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我寫了一個簡單的程序,以瞭解如何JPopupMenu
工作。但是我的代碼有些問題,它不能正確顯示彈出式菜單。請有人能告訴我原因嗎?JPopupMenu不工作
public class PopUpMenu extends JFrame implements ActionListener {
JPanel panel;
JPopupMenu popMenu;
JMenuItem cut;
JMenuItem copy;
public PopUpMenu() {
setVisible(true);
setSize(300, 300);
setDefaultCloseOperation(EXIT_ON_CLOSE);
panel = new JPanel();
popMenu = new JPopupMenu();
cut = new JMenuItem();
popMenu.add(cut);
copy = new JMenuItem();
popMenu.add(copy);
add(panel);
panel.setComponentPopupMenu(popMenu);
addMouseListener(new MouseAdapter() {
public void mouseReleased(MouseEvent Me) {
if (Me.isPopupTrigger()) {
popMenu.show(Me.getComponent(), Me.getX(), Me.getY());
}
}
});
}
public void actionPerformed(ActionEvent arg0) {
}
public static void main(String[] args) {
Runnable r = new Runnable() {
public void run() {
PopUpMenu pop = new PopUpMenu();
}
};
SwingUtilities.invokeLater(r);
}
}
非常感謝您的澄清:-) – 2011-03-09 08:58:43