Java Learning Note (47)-Event monitoring

Implementation class for defining the ActionListener interface implements event monitoring

ImportJava.awt.Button;ImportJava.awt.Frame;ImportJava.awt.event.ActionEvent;ImportJava.awt.event.ActionListener;ImportJava.awt.event.WindowEvent;ImportJava.awt.event.WindowListener;/ * Event monitoring * / Public  class Test04 {     Public Static void Main(string[] args) {Frame frame=NewFrame ("My Forms"); Button btn=NewButton ("point me.");//For button binding event listener, that is, register listener        //btn.addactionlistener (New Buttonhandler ());Btn.addactionlistener (NewActionListener () { Public void actionperformed(ActionEvent e) {//Get text on the buttonString Cmd=e.getactioncommand (); System.out.println (CMD);//Click the button to pop up a new formFrame frm=NewFrame ("I was clicked to pop the drip"); Frm.setsize ( -, -); Frm.setlocationrelativeto (NULL); Frm.setvisible (true); }        });//For form-bound event snoopingFrame.addwindowlistener (NewWindowListener () {@Override             Public void windowopened(WindowEvent e) {System.out.println ("***windowopened"); }@Override             Public void windowiconified(WindowEvent e) {//TODO auto-generated method stub}@Override             Public void windowdeiconified(WindowEvent e) {//TODO auto-generated method stub}@Override             Public void windowdeactivated(WindowEvent e) {//TODO auto-generated method stub}@Override             Public void windowclosing(WindowEvent e) {System.out.println ("***windowclosing"); }@Override             Public void windowclosed(WindowEvent e) {//TODO auto-generated method stub}@Override             Public void windowactivated(WindowEvent e) {System.out.println ("***windowactivated");        }        });        Frame.add (BTN); Frame.setsize ( $, $); Frame.setlocationrelativeto (NULL); Frame.setvisible (true); }}//define the implementation class for the ActionListener interfaceClass Buttonhandler implements actionlistener{//When the ActionEvent event occurs, the event object is automatically generated, passed in as a parameter, and the Actinperformed method is called automatically    @Override     Public void actionperformed(ActionEvent e) {//Get text on the buttonString Cmd=e.getactioncommand (); System.out.println (CMD);//Click the button to pop up a new formFrame frm=NewFrame ("I was clicked to pop the drip"); Frm.setsize ( -, -); Frm.setlocationrelativeto (NULL); Frm.setvisible (true); }}

To bind multiple listeners to a component

ImportJava.awt.Button;ImportJava.awt.Color;ImportJava.awt.Frame;ImportJava.awt.TextField;ImportJava.awt.event.ActionEvent;ImportJava.awt.event.ActionListener;ImportJava.awt.event.FocusEvent;ImportJava.awt.event.FocusListener;ImportJava.awt.event.KeyEvent;ImportJava.awt.event.KeyListener;ImportJava.awt.event.MouseEvent;ImportJava.awt.event.MouseListener;ImportJava.awt.event.TextEvent;ImportJava.awt.event.TextListener;/ * * Bind multiple listeners for one component */ Public  class Test05 {Frame frame =NewFrame ("My Forms"); Button BTN =NewButton ("point me."); TextField txt=NewTextField (Ten);intCount =0; Public Test05() {init (); } Public void Init() {//For button binding ActionEvent monitoringBtn.addactionlistener (NewActionListener () {@Override             Public void actionperformed(ActionEvent e) {System.out.println ("***actionperformed");                count++; Btn.setlabel (count+""); }        });//For button binding MouseEvent monitoringBtn.addmouselistener (NewMouseListener () {@Override             Public void mousereleased(MouseEvent e) {//system.out.println ("****mousereleased");}@Override             Public void mousepressed(MouseEvent e) {//system.out.println ("****mousepressed");}@Override             Public void mouseexited(MouseEvent e) {//system.out.println ("****mouseexited");}@Override             Public void mouseentered(MouseEvent e) {//system.out.println ("****mouseentered");}@Override             Public void mouseclicked(MouseEvent e) {System.out.println ("****mouseclicked"); }        });//Bind Listener for text boxTxt.addfocuslistener (NewFocuslistener () {@Override             Public void Focuslost(FocusEvent e) {System.out.println ("***focuslost");                TextField txtsource= (TextField) E.getsource ();            Txtsource.setbackground (Color.White); }@Override             Public void focusgained(FocusEvent e) {System.out.println ("***focusgained"); TextField txtsource= (TextField) E.getsource ();//Get Event sourceTxtsource.setbackground (Color.gray);        }        }); Txt.addtextlistener (NewTextListener () {@Override             Public void textvaluechanged(TextEvent e) {System.out.println ("text box is changed"+e.paramstring ());        }        }); Txt.addkeylistener (NewKeyListener () {@Override             Public void keytyped(KeyEvent e) {//TODO auto-generated method stub}@Override             Public void keyreleased(KeyEvent e) {//TODO auto-generated method stub}@Override             Public void keypressed(KeyEvent e) {System.out.println (E.getkeycode () +" "+e.getkeychar ());if(E.getkeycode () ==keyevent.vk_enter) {System.out.println ("haha, you pressed the carriage return, was found!" ");        }            }        }); Frame.add ("North", TXT);        Frame.add (BTN); Frame.setsize ( $, $); Frame.setlocationrelativeto (NULL); Frame.setvisible (true); } Public Static void Main(string[] args) {NewTest05 (); }}

How the listener is implemented

Import Java.awt.button;import Java.awt.frame;import Java.awt.event.actionevent;import Java.awt.event.ActionListener;/ * * Listener Implementation Method */ Public  class Test06 extends Frame implements ActionListener {Button btn=NewButton ("point me."); PublicTest06 (String title) {Super(title);    Init (); } Public voidInit () {//Mode one: Anonymous inner class        /*btn.addactionlistener (New ActionListener () {@Override public void actionperformed (ActionEvent            e) {System.out.println ("use Anonymous inner class mode"); }        });*/        //Mode two        //btn.addactionlistener (New MyHandler ());        //Way three        //btn.addactionlistener (this);        //Mode fourBtn.addactionlistener (NewMyHandler2 ());        Add (BTN); SetSize ( $, $); Setlocationrelativeto (NULL); SetVisible (true); }//Way Three: Container class@Override Public voidactionperformed (ActionEvent e) {System.out.println ("Use container class mode"); }//Mode four: member Inner class     class MyHandler2 implements ActionListener{         Public voidactionperformed (ActionEvent e) {System.out.println ("Use external class mode"); }    } Public Static voidMain (string[] args) {NewTest06 ("Form"); }}//Mode two: external class class MyHandler implements ActionListener {@Override Public voidactionperformed (ActionEvent e) {System.out.println ("Use external class mode"); }}

Java Learning Note (47)-Event monitoring