Java AWT Event Listener

Testactionevent.java


import java.awt.*;
Import java.awt.event.*;

public class testactionevent{public
	static void Main (string[] args) {
		frame f=new frame ("testactionevent");
		Button B=new button ("Press Me!");
		Monitor bh=new Monitor ();
		B.addactionlistener (BH);
		F.add (b,borderlayout.center);
		F.pack ();

Testtextfield.java

import java.awt.*;
Import java.awt.event.*;

Class testtextfield{public
	static void Main (string[] args) {
		new Tfframe ();
	}	
}

Class Tfframe extends frame{
	tfframe () {TextField tf=new TextField
		();
		Add (TF);
		Tf.addactionlistener (New Tfactionlistener ());
		Pack ();
		SetVisible (True);	
	}

Class Tfactionlistener implements actionlistener{public
		void actionperformed (ActionEvent e) {
			TextField tf= (TextField) E.getsource ();
			System.out.println (Tf.gettext ());
			Tf.settext ("");
		}
}

Testtextfield.java Change the Echo character

import java.awt.*;
Import java.awt.event.*;

Class testtextfield{public
	static void Main (string[] args) {
		new Tfframe ();
	}	
}

Class Tfframe extends frame{
	tfframe () {TextField tf=new TextField
		();
		Add (TF);
		Tf.addactionlistener (New Tfactionlistener ());
		Tf.setechochar (' * ');
		Pack ();
		SetVisible (True);	
	}

Class Tfactionlistener implements actionlistener{public
		void actionperformed (ActionEvent e) {
			TextField tf= (TextField) E.getsource ();
			System.out.println (Tf.gettext ());
			Tf.settext ("");
		}
}

Addition Calculator import java.awt.*;

Import java.awt.event.*;
	Class testtfmath{public static void Main (string[] args) {new Tfmath ();
	} class Tfmath extends frame{TextField a=null;
	TextField B=null;
	
	TextField C=null;
		Tfmath () {a=new TextField ();
		B=new TextField ();
		C=new TextField ();
		Button Plus=new button ("calculation");
		Label Lbplus=new label ("+");
		Label Lbis=new label ("=");
		Plus.addactionlistener (This) (new Actionlistener_plus);
		SetLayout (New FlowLayout ());
		Add (a);
		Add (Lbplus);
		Add (b);
		Add (Lbis);
		Add (c);
		Add (plus);
		Pack ();	
	SetVisible (TRUE);
		} class Actionlistener_plus implements actionlistener{/*textfield a,b,c;
			Actionlistener_plus (TextField A,textfield B,textfield c) {this.a=a;
			This.b=b;
		This.c=c;
		}*/Tfmath Tm=null;
		Actionlistener_plus (Tfmath tm) {This.tm=tm;
			public void actionperformed (ActionEvent e) {int i_a=integer.parseint (Tm.a.gettext ());
			int I_b=integer.parseint (Tm.b.gettext ()); Tm.c.settext ("" + (I_a+i_b)); }
}

Anonymous internal class event listener

import java.awt.*;
Import java.awt.event.*;

Class testtfmath{public
	static void Main (string[] args) {
		new Tfmath ();
	}	
}

Class Tfmath extends frame{
	Tfmath () {
		final TextField a=new ();
		Final TextField b=new TextField ();
		Final TextField c=new TextField ();
		Button Plus=new button ("calculation");
		Label Lbplus=new label ("+");
		Label Lbis=new label ("=");
		Plus.addactionlistener (new ActionListener () {public
				void actionperformed (ActionEvent e) {
					C.settext ("" + Integer.parseint (A.gettext ())
						+integer.parseint (B.gettext ()));
				})
		;
		SetLayout (New FlowLayout ());
		Add (a);
		Add (lbplus);
		Add (b);
		Add (lbis);
		Add (c);
		Add (plus);
		Pack ();
		SetVisible (True);	
	}	

Testactionevent2.java

import java.awt.*;
Import java.awt.event.*;

public class testactionevent2{public
	static void Main (string[] args) {
		frame f=new frame ("testactionevent");
		Button Btn_start=new button ("Start");
		Button Btn_stop=new button ("Stop");
		Monitor bh=new Monitor ();
		Btn_start.addactionlistener (BH);
		Btn_stop.addactionlistener (BH);
		F.add (btn_start,borderlayout.west);
		F.add (btn_stop,borderlayout.east);
		F.pack ();
		F.setvisible (True);
	}

Class Monitor implements actionlistener{public
		void actionperformed (ActionEvent e) {
			System.out.println (" Button "+ e.getactioncommand () +" pressed! ");
		}