Three Java event handling methods

/*************************************** **************************************** ***********
* This class implements different methods for event listening to swing components *
* 1 implement the corresponding interface by the class, and rewrite the methods in the interface in the class to process the event *
* 2. Use an anonymous class to process events (used when multiple event sources exist )*
* 3 process events through internal Classes *
**
* If multiple event sources exist, you can use two methods to obtain the event source *
* The second method is recommended for getactioncommand () getsource *
**
* If the corresponding listener interface has multiple methods, you can use the corresponding adapter to listen to events *

**************************************** **************************************** **********/
Import javax. Swing. jframe;
Import javax. Swing. jpanel;
Import javax. Swing. jlabel;
Import javax. Swing. jtextfield;
Import javax. Swing. jbutton;
Import javax. Swing. Border. titledborder;
Import java. AWT. event .*;

// Public class chenji extends jframe implements actionlistener
Public class chenji extends jframe
{
Private jpanel;
Private jpanel jpanel1;
Private jtextfield nametext;
Private jtextfield sextext;
Private jtextfield addtext;
Private jtextfield chinatext;
Private jtextfield mathtext;
Private jtextfield englishtext;
Private jtextfield zhengzhitext;
Private jtextfield test;
Private jlabel title;
Private jlabel name;
Private jlabel sex;
Private jlabel add;
Private jlabel China;
Private jlabel math;
Private jlabel English;
Private jlabel zhengzhi;
Private jbutton jbutton1;
Private jbutton jbutton2;
Private jbutton jbutton3;
 
Public chenji ()
{
Setsize (400,500 );
Settitle ("score Registration Form ");
Setdefaclocloseoperation (exit_on_close );
Fram1 ();
}
Public void fram1 ()
{
Jpanel = (jpanel) getcontentpane ();
Jpanel. setlayout (null );
Title = new jlabel ("score Registration Form ");
Title. setbounds );
Jpanel. Add (title );
Name = new jlabel ("name ");
Name. setbounds (10, 40, 50, 20 );
Jpanel. Add (name );
Nametext = new jtextfield ("");
Nametext. setbounds (80, 40, 50, 20 );
Jpanel. Add (nametext );
Sex = new jlabel ("gender ");
Sex. setbounds (170,40, 50,20 );
Jpanel. Add (sex );
Sextext = new jtextfield ("");
Sextext. setbounds );
Jpanel. Add (sextext );
Add = new jlabel ("Hometown ");
Add. setbounds (10, 90, 50, 20 );
Jpanel. Add (ADD );
Addtext = new jtextfield ("");
Addtext. setbounds );
Jpanel. Add (addtext );
Jpanel1 = new jpanel ();
Jpanel1.setlayout (null );
Jpanel1.setborder (New titledborder ("score "));
Jpanel1.setbounds (10,120,370,150 );
China = new jlabel (" ");
China. setbounds (10, 20, 50, 20 );
Jpanel1.add (China );
Chinatext = new jtextfield ("");
Chinatext. setbounds (90,20, 50,20 );
Jpanel1.add (chinatext );
Math = new jlabel ("Mathematics ");
Math. setbounds (170,20, 50,20 );
Jpanel1.add (math );
Mathtext = new jtextfield ("");
Mathtext. setbounds (, 20, 50, 20 );
Jpanel1.add (mathtext );
Zhengzhi = new jlabel ("Politics ");
Zhengzhi. setbounds (10, 60, 50, 20 );
Jpanel1.add (zhengzhi );
Zhengzhitext = new jtextfield ("");
Zhengzhitext. setbounds (90,60, 50,20 );
Jpanel1.add (zhengzhitext );
Jpanel. Add (jpanel1 );
Jbutton1 = new jbutton ("total score ");
Jbutton1.addactionlistener (New actionlistener () // implement event processing through anonymous internal classes
{
Public void actionreceivmed (actionevent e) // use getactioncommand () to obtain the event Source
{
String Ss = E. getactioncommand ();
Try {
If (ss. Equals ("total score "))
Zongchengji ();
Else
Pingjun ();
} Catch (exception ex)
{
Ex. printstacktrace ();
System. Out. println ("your input score is incorrect ");
}

/* Jbutton JB = (jbutton) E. getsource (); // getsource () to obtain the event Source
Try {
If (JB = jbutton1)
Zongchengji ();
Else
Pingjun ();
} Catch (exception ex)
{
// Ex. printstacktrace ();
System. Out. println ("your input score is incorrect ");
}
*/
}
});
Jbutton1.setbounds (100,380, 50, 20 );
Jpanel. Add (jbutton1 );
Jbutton2 = new jbutton ("average score ");
Jbutton2.addactionlistener (New eventtest (); // implement event processing through internal classes
Jbutton2.setbounds (100,280, 50, 20 );
Jpanel. Add (jbutton2 );
Jbutton3 = new jbutton ("clear text box ");
// Jbutton3.addactionlistener (this); // use the class itself to implement the corresponding listening interface for event processing
Jbutton3.setbounds (180,380, 50, 20 );
Jpanel. Add (jbutton3 );
Test = new jtextfield ();
Test. setbounds (180,280, 80, 20 );
Jpanel. Add (test );
}
Public void actionreceivmed (actionevent E)
{
String Ss = E. getactioncommand ();
Try {
If (ss. Equals ("total score "))
Zongchengji ();
Else if (ss. Equals ("clear text box "))
Test. settext ("");
Else
Pingjun ();

} Catch (exception ex)
{
Ex. printstacktrace ();
System. Out. println ("your input score is incorrect ");
}

/* Jbutton JB = (jbutton) E. getsource ();
Try {
If (JB = jbutton1)
Zongchengji ();
Else
Pingjun ();
} Catch (exception ex)
{
// Ex. printstacktrace ();
System. Out. println ("your input score is incorrect ");
}
*/
}
Public void zongchengji ()
{
Float China = float. parsefloat (chinatext. gettext ());
Float math = float. parsefloat (mathtext. gettext ());
Float zhengzhi = float. parsefloat (zhengzhitext. gettext ());
String Zong = new float (China + math + zhengzhi). tostring ();
Test. settext (zong );
}
Public void pingjun ()
{
Float China = float. parsefloat (chinatext. gettext ());
Float math = float. parsefloat (mathtext. gettext ());
Float zhengzhi = float. parsefloat (zhengzhitext. gettext ());
String pingjun = new float (China + math + zhengzhi)/3). tostring ();
Test. settext (pingjun );
}
Public static void main (string [] ARGs)
{
Chenji = new chenji ();

Chenji. setvisible (true );

}

Class eventtest implements actionlistener
{
Public void actionreceivmed (actionevent E)
{
String Ss = E. getactioncommand ();
Try {
If (ss. Equals ("total score "))
Zongchengji ();
Else
Pingjun ();

} Catch (exception ex)
{
Ex. printstacktrace ();
System. Out. println ("your input score is incorrect ");
}

/* Jbutton JB = (jbutton) E. getsource ();
Try {
If (JB = jbutton1)
CJ. zongchengji ();
Else
CJ. pingjun ();
} Catch (exception ex)
{
// Ex. printstacktrace ();
System. Out. println ("your input score is incorrect ");
}
*/
}
}
}