Java error: cannot find symbol, and can't figure out why -

error:

error: cannot find symbol 

what appears doesn't works:

if write: "invoervakhandler extends boven" error disapears endless loop , in end program crashes , says stack overflow error.

if try change "}" symbol class boven , place in end of text more error messages.

question: have change in code make work?

note: i'm new java , know there more posts 1 can't apply them code current limited understanding of java.

if wants know: i'm using jcreator.

what i'm trying make: i'm trying make simple.

1) fill in name in jtextfield, press enter , name should appear in jtextarea. after name in jtextarea jtextfield becomes empty can fill name , on there should appear list of names in jtextarea. (this i'm trying make)

2) push button kieswin make program choose random person list.

3) push button resetl reset program can make new list choose random winner it.

part of code error appears: (from class invoervakhandler)

string invoer = invoervak1.gettext(); 

with limited knowledge of java problem litterly anywhere in case post whole code.

whole code:

import javax.swing.*; import javax.swing.border.*; import java.awt.*; import java.awt.event.*; import java.util.*;  // main method make frame public class loterij3 extends jframe { public static void main( string args[] ) {     jframe frame = new loterij3();     frame.setextendedstate( frame.maximized_both );     frame.setdefaultcloseoperation( jframe.exit_on_close );     frame.settitle( "klanten register" );     frame.setcontentpane( new paneel() );     frame.setvisible( true ); } }  class paneel extends jpanel { private boven boven; jtextarea textvak1; jtextfield textvak2; onthoudnaam onthoudnaam = new onthoudnaam();  public paneel() { setlayout( new borderlayout() ); // using border layout. setbackground( color.light_gray );  textvak1 = new jtextarea(); add( new jscrollpane( textvak1 ) ); textvak1.setbackground( color.white );  textvak2 = new jtextfield(); textvak2.sethorizontalalignment(jtextfield.center); textvak2.seteditable( false );  boven = new boven();      add( boven, borderlayout.north ); add( textvak1, borderlayout.center ); add( textvak2, borderlayout.south ); }  public class boven extends paneel { jbutton kieswin, resetl; jlabel label1; jtextfield invoervak1;  public boven() {     setbackground( color.light_gray );     setlayout( new gridlayout( 1, 4, 100, 5 ) ); // using gridlayout.     border border =          borderfactory.createemptyborder( 10, 10, 10, 10 );     setborder( border );      kieswin = new jbutton("kies een winnaar!");     kieswin.addactionlistener( new kies() );     resetl = new jbutton("reset alles");     resetl.addactionlistener( new reset() );     label1 = new jlabel("voer persoon in en druk op enter: ", jlabel.right);     invoervak1 = new jtextfield( 20 );     invoervak1.addactionlistener( new invoervakhandler() );      add( label1 );     add( invoervak1 );     add( kieswin );     add( resetl );     } }  // de naam class naam {     private string ingevoerdnaam;      public naam( string ingevoerdnaam) {         this.ingevoerdnaam = ingevoerdnaam;     }      public string getingevoerdnaam() {         return ingevoerdnaam;     } }  // arraylist class onthoudnaam extends jpanel {     private arraylist<naam> lijst;      public onthoudnaam() {         lijst = new arraylist<naam>();         }          public void voegnaamtoe(naam x ) {         lijst.add(x);         }          public string tostring() {         stringbuffer buffer = new stringbuffer();         for(naam x : lijst ) {         buffer.append( x );         buffer.append( "\n" );     }     return buffer.tostring(); } }  // part code goes wrong public class invoervakhandler implements actionlistener {     public void actionperformed( actionevent e ) {         string invoer = invoervak1.gettext();         naam naam = new naam( invoer );         onthoudnaam.voegnaamtoe( naam );         textvak1.settext( onthoudnaam.tostring() );     } }     // kies class kies implements actionlistener {     public void actionperformed( actionevent e ) {     } }  // reset class reset implements actionlistener {     public void actionperformed( actionevent e ) {     } } } 

for trying me: thank , patience in advance!

the line in question in in class: invoervakhandler

the variable defined in class: boven

that why can't find it.

i think can source of event actionevent passed actionperformed() method.

note use upper-case letter begin name of class , lower case begin methods , variables. (constants exception.)