J Check Box Menultem / FHJRadioButton Menultem helpMenu. add(new JCheck BoxMenultem("Check it")) JMenu color SubMenu=new JMenu("Color") helpMenu. add( colorHelpSubMenu JRadioButtonMenultem jrbmiBlue, jrbmi Yellow, jrbmiRed colorHelp SubMenu addgrbmiBlue=new JRadio Button Menuitem("Blue")) colorHelp SubMenuaddgrbmi Yellow=new JRadioButtonMenultem("Yellow) colorHelp SubMenu addgjrbmired=new JRadioButtonMenultem("Red")) Button Group btg -new Button Groupo btg. add gjrbmiblue) btg. addgjrbmiYellow) btg. addgjrbmiRed) 是 My Menu - Ox My Menus My Menus File Help File Help File Help Software Software New Hardware Hardware M Check it C Open d Check it Color O Blue Print Exit O RedJCheckBoxMenuItem和JRadioButtonMenuItem helpMenu.add(new JCheckBoxMenuItem("Check it")); JMenu colorHelpSubMenu = new JMenu("Color"); helpMenu.add(colorHelpSubMenu); JRadioButtonMenuItem jrbmiBlue, jrbmiYellow, jrbmiRed; colorHelpSubMenu.add(jrbmiBlue=new JRadioButtonMenuItem("Blue")); colorHelpSubMenu.add(jrbmiYellow=new JRadioButtonMenuItem("Yellow")); colorHelpSubMenu.add(jrbmiRed=new JRadioButtonMenuItem("Red")); ButtonGroup btg =new ButtonGroup(); btg.add(jrbmiBlue); btg.add(jrbmiYellow); btg.add(jrbmiRed);