Java Learning Note (javase Bi Xiangdong version video) Nine

GUI: Graphical user interface, Java is not commonly used to create desktop applications, so use less

First, overview:

Second, Frame demo:

Third, the event monitoring mechanism

1 ImportJava.awt.Button;2 Importjava.awt.FlowLayout;3 ImportJava.awt.Frame;4 ImportJava.awt.TextField;5 ImportJava.awt.event.KeyAdapter;6 Importjava.awt.event.KeyEvent;7 ImportJava.awt.event.MouseAdapter;8 Importjava.awt.event.MouseEvent;9 ImportJava.awt.event.WindowAdapter;Ten Importjava.awt.event.WindowEvent; One  A  -  Public classFramedemo { -      Public Static voidMain (string[] args) { the demo (); -     } -  -      Public Static voidDemo () { +         //1, create a Frame object, will open a thread -Frame f=NewFRAME ("First frame"); +         //2. Set the size and position of the form AF.setsize (500, 400); atF.setlocation (400, 150); -         //3. Using Flow layout -F.setlayout (NewFlowLayout ()); -         //4. Add Other Components -Button btn=NewButton ("Buttons"); -TextField tf=NewTextField (15); in F.add (TF); - F.add (BTN); to Eventdemo (F,BTN,TF); +         //5. Display Form -F.setvisible (true); the     } *  $      Public Static voidEventdemo (Frame F,button btn,FinalTextField TF) {Panax Notoginseng         /*You can add listeners to component objects, which are objects that handle events and can handle different events differently - * Windowadapter is the adapter object for the form listener the * ActionListener is the active Listener object +          */ AF.addwindowlistener (NewWindowadapter () { the @Override +              Public voidwindowclosing (windowevent e) { -System.exit (0); $             } $         }); - //Btn.addactionlistener (New ActionListener () { - //@Override the //Public void actionperformed (ActionEvent e) { - //system.exit (0);Wuyi //            } the //        }); -         //Mouse Listener WuBtn.addmouselistener (NewMouseadapter () { -             Private intCount=1; About @Override $              Public voidmouseentered (MouseEvent e) -             { -Tf.settext ("" +count++); -             } A  + @Override the              Public voidmouseexited (MouseEvent e) -             { $Tf.settext ("" +count++); the             } the              the         }); the         //Keyboard Listener -Tf.addkeylistener (NewKeyadapter () in         { the             //Some of the keys on the keyboard are display characters, but some are control keys the @Override About              Public voidkeypressed (keyevent e) the             { the //System.out.println (E.getkeychar () + ":" +e.getkeycode ()); the                 intKeycode=E.getkeycode (); +                 if(! (keycode>=keyevent.vk_0&&keycode<=keyevent.vk_9| | keycode==37| | keycode==39| | Keycode==8)){ -                     //prevent execution of default events the E.consume ();BayiSYSTEM.OUT.PRINTLN ("must be a number"); the                 } the             } -         }); -     } the}

frame and Event brief

Java Learning Note (javase Bi Xiangdong version video) Nine