Aprogressbarwithanunknownmaximumtypicallydisplaysananimationuntilthetaskiscomplete.Note:Thepercentagedisplayshouldnotbeenabledwhenthemaximumisnotknown(e804显示JPr...

Aprogressbarisusedtovisuallyindicatehowmuchataskhasbeenprogressed.Aprogressbarcanbeorientedhorizontally(left-to-right)orvertically(bottom-to-top).Bydefault,theo...

Acommonfeatureofauserinterfaceistoshowaprogressdialogthatvisuallydisplaystheprogressofalong-runningtask.Thedialogautomaticallydisappearswhenthetaskisdone.ThePro...

finalJPopupMenumenu=newJPopupMenu();//CreateandaddamenuitemJMenuItemitem=newJMenuItem("ItemLabel");item.addActionListener(actionListener);menu.add(item);//Setth...

Seee810创建弹出菜单foranexampleonhowtodisplayapopupmenu.finalJPopupMenupopupMenu=newJPopupMenu();//CreateasubmenuwithitemsJMenusubmenu=newJMenu("SubMenu1");submenu.ad...

AmenuitemcanreceivenotificationofselectionchangesbyoverridingitsmenuSelectionChanged()method.Seealsoe808建立菜单栏，菜单，菜单项.JMenuItemitem=newJMenuItem("Label"){//Thism...

Bydefault,alistallowsmorethanoneitemtobeselected.Also,theselecteditemsneednotbecontiguous.Tochangethisdefault,seee781设置JList中的选择模式.Alistselectioneventisfiredwhe...

//Thetextisleft-justifiedandverticallycenteredJLabellabel=newJLabel("TextLabel");//Thetextishorizontallyandverticallycenteredlabel=newJLabel("TextLabel",JLabel....

Aframeisacomponentcontainerthatdisplaysitscontentsinatop-levelwindowwithatitlebarandbuttonstoresize,iconify,maximize,andclosetheframe.UnlikemostSwingcontainers,...

Imagesinacceleratedmemoryaremuchfastertodrawonthescreen.Thisexampledemonstrateshowtotakeanimageandmakeanacceleratedcopyofitandthenuseittodrawonthescreen.Theprob...

ThisexampledemonstrateshowtoconvertabytearrayofpixelvaluesthatareindicestoacolortableintoaBufferedImage.Inparticular,theexamplegeneratestheMandelbrotsetinabyteb...

ThisexampledemonstrateshowtoconvertabytearrayofpixelvaluesthatareindicestoacolortableintoanImage.Inparticular,theexamplegeneratestheMandelbrotsetinabytebufferan...

AnImageobjectcannotbeconvertedtoaBufferedImageobject.Theclosestequivalentistocreateabufferedimageandthendrawtheimageonthebufferedimage.Thisexampledefinesamethod...

Abufferedimageisatypeofimagewhosepixelscanbemodified.Forexample,youcandrawonabufferedimageandthendrawtheresultingbufferedimageonthescreenorsaveittoafile.Abuffer...

Shapeline=newLine2D.Float(x1,y1,x2,y2);Shapearc=newArc2D.Float(x,y,w,h,start,extent,type);Shapeoval=newEllipse2D.Float(x,y,w,h);Shaperectangle=newRectangle2D.Fl...