Creating a multi-level menu form for the Java 24-7 GUI

Demand:
Create a multilevel menu

Steps:
A: Create Form Objects (and set properties and layouts)
B: Create a menu bar
C: Create menus and submenus
D: Add menu Incrementally (submenu added to menu, menu added to menu bar)
E: Set menu bar in form (menu bar is not added, but set)
F: Set Listener events for each menu
G: Set the form to turn off listening time
H: Setting the display window

Code:

1  Public classFRAMETEXT4 {2 3      Public Static voidMain (string[] args) {4 5         //Create a Form object6         FinalFrame f =NewFrame ("Multilevel Menu");7         //Set Form Properties8F.setbounds (300, 300, 500, 500);9F.setlayout (NewFlowLayout ());Ten  One         //get the original title A         FinalString str =f.gettitle (); -          -         //Create a menu bar theMenuBar m =NewMenuBar (); -  -         //Create a menu -Menu M1 =NewMenu ("Action"); +Menu m2 =NewMenu ("Change title"); -  +         //Create a sub-menu A         FinalMenuItem MI1 =NewMenuItem ("N-level menu"); at         FinalMenuItem mi2 =NewMenuItem ("M-level menu"); -MenuItem Mi3 =NewMenuItem ("Restore title"); -MenuItem Mi4 =NewMenuItem ("Exit"); -MenuItem MI5 =NewMenuItem ("Open Notepad"); -  -         //incrementally Add in         //submenu added to menu - M2.add (MI1); to M2.add (mi2); + M2.add (MI3); - M1.add (m2); the M1.add (MI5); * M1.add (MI4); $         Panax Notoginseng         //menu is added to the menu bar - M.add (M1); the  +         //Setting the menu bar in a form A F.setmenubar (m); the  +         //set Listener events for each menu -Mi1.addactionlistener (NewActionListener () { $  $              Public voidactionperformed (ActionEvent e) { -                 //change the name of the title bar -                 //to make changes later, first get the name of the Mi1 menu, and then change the F.settitle (Mi1.getlabel ()); -                 //Change the title name of the window to the MI1 labelWuyi             } the         }); -          WuMi2.addactionlistener (NewActionListener () { -  About              Public voidactionperformed (ActionEvent e) { $                 //such as Mil1 - F.settitle (Mi2.getlabel ()); -             } -              A         }); +          theMi3.addactionlistener (NewActionListener () { -             //this is different from the above 2, because it is the original title restored.  $             //so you have to create a string in front to get the beginning of the title, and then directly to change it can be  the              Public voidactionperformed (ActionEvent e) { the f.settitle (str); the             }         the         }); -          in         //Exit System theMi4.addactionlistener (NewActionListener () { the  About              Public voidactionperformed (ActionEvent e) { the                 //Exit System theSystem.exit (0);  the             } +              -         }); the         Bayi         //Open Notepad theMi5.addactionlistener (NewActionListener () { the  -              Public voidactionperformed (ActionEvent e) { -                  //Runtime enables applications to connect to the environment in which they run  the                  //publicStatic Runtime GetRuntime () returns the runtime object associated with the current Java application.  the                 The  //publicprocess exec (String command) executes the specified string commands in a separate process.  the                  theRuntime r =runtime.getruntime (); -                 Try { theR.exec ("notepad"); the}Catch(IOException E1) { the                     //TODO auto-generated Catch block94 e1.printstacktrace (); the                 } the              the             }98              About         }); -         101         //Setting the window to turn off listener events102F.addwindowlistener (NewWindowadapter () {103              Public voidwindowclosing (windowevent e) {104System.exit (0); the             }106         });107         108         //make the form display109F.setvisible (true); the     }111  the}

Creating a multi-level menu form for the Java 24-7 GUI