Question

如何用Netbeans构建GUI程序

Answer 1

JMenuItemadd(JMenuItemmenuItem)将指定菜单项添加到此菜单的末尾。JMenuItemadd(Strings)创建具有指定文本的菜单项，并将其添加到此菜单的末尾。//whereinstancevariablesaredeclared:JPopupMenupopup;//wheretheGUIisconstructed://Createthepopupmenu.popup=newJPopupMenu();menuItem=newJMenuItem("Apopupmenuitem");menuItem.addActionListener(this);popup.add(menuItem);menuItem=newJMenuItem("Anotherpopupmenuitem");menuItem.addActionListener(this);popup.add(menuItem);//Addlistenertocomponentsthatcanbringuppopupmenus.MouseListenerpopupListener=newPopupListener();output.addMouseListener(popupListener);menuBar.addMouseListener(popupListener);classPopupListenerextendsMouseAdapter{publicvoidmousePressed(MouseEvente){maybeShowPopup(e);}publicvoidmouseReleased(MouseEvente){maybeShowPopup(e);}privatevoidmaybeShowPopup(MouseEvente){if(e.isPopupTrigger()){popup.show(e.getComponent(),e.getX(),e.getY());}}}