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毕业设计（论文）文献翻译





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学生姓名学号
专业名称计算机科学与技术年级2009级
指导教师职称讲师
所在系（院）计算机科学与技术

2013年3月1日

MenusandToolbars
Excerptedfrom"JavaSwing(2NdEdition)(O'Reilly)"byMarcLoy,RobertEcksteinetc.

TheJMenuBarClass

Swing'sJMenuBarclasssupersedestheAWTMenuBarclass.Thisclasscreatesahorizontalmenubarcomponentwithzeroormoremenusattachedtoit.JMenuBarusestheDefaultSingleSelectionModelasitsdatamodelbecausetheusercanraise,oractivate,onlyoneofitsmenusatagiventime.Oncethemousepointerleavesthatmenu,theclassremovesthemenufromthescreen(orcancelsit,inSwinglingo),andallmenusagainbecomeeligibletoberaisedFigure14-4showstheclasshierarchyfortheJMenuBarcomponent.

Figure14-4.JMenuBarclassdiagram
YoucanaddJMenuobjectstothemenubarwiththeadd()methodoftheJMenuBarclass.JMenuBarthenassignsanintegerindexbasedontheorderinwhichthemenuswereadded.Themenubardisplaysthemenusfromlefttorightonthebaraccordingtotheirassignedindex.Intheory,thereisoneexception:thehelpmenu.Youaresupposedtobeallowedtomarkonemenuasthehelpmenu;thelocationofthehelpmenuisuptotheL&F.Inpractice,tryingtodothisresultsinJMenuBarthrowinganError.

MenuBarPlacement

YoucanattachmenubarstoSwingframesorappletsinoneoftwoways.First,youcanusethesetJMenuBar()methodofJFrame,JDialog,JApplet,orJInternalFrame:

JFrameframe=newJFrame("Menu");
JMenuBarmenuBar=newJMenuBar();
//Attachthemenubartotheframe.
frame.setJMenuBar(menuBar);

ThesetJMenuBar()methodisanalogoustothesetMenuBar()methodofjava.awt.Frame.Likeitspredecessor,setJMenuBar()allowstheL&Ftodeterminethelocationofthemenu(typically,itanchorsthemenubartothetopofaframe,adjustingtheframe'sinternalInsetsaccordingly).BothJAppletandJDialogcontainasetJMenuBar()method—thismeansthatyoucanaddmenubarstobothappletsanddialogs.Eitherway,besurenottoconfusethesetJMenuBar()methodwiththeoldersetMenuBar()methodofAWTwhenworkingwithSwingmenus,orthecompilercomplainsbitterly.
IfyourapplicationisrunningonaMacintosh,theMacL&Fcanbeconfiguredtoplacemenubarsatthetopofthescreen,whereMacusersexpecttofindthem.Settingthesystem