java - Can't access these variables outside the ActionListener -

i have been stuck on weekend, have looked everywhere , not single solution. appreciated.

    int idaybirth = integer.parseint(jtextfield_dobday.gettext());     int imonthbirth = integer.parseint(jtextfield_dobmonth.gettext());     int iyearbirth = integer.parseint(jtextfield_dobyear.gettext());      int idaycurrent = integer.parseint(jtextfield_cdday.gettext());     int imonthcurrent = integer.parseint(jtextfield_cdmonth.gettext());     int iyearcurrent = integer.parseint(jtextfield_cdyear.gettext());      double idaysalive = 0;     calendar cabirthdate = new gregoriancalendar(iyearbirth, imonthbirth - 1, idaybirth);     calendar cacurrentdate = new gregoriancalendar(iyearcurrent, imonthcurrent - 1, idaycurrent);      jbutton btncalculate = new jbutton("calculate");     btncalculate.addactionlistener(new actionlistener() {         public void actionperformed(actionevent e) {             idaysalive = (cacurrentdate.gettimeinmillis() - cabirthdate.gettimeinmillis());             idaysalive = (idaysalive / (24 * 60 * 60 * 1000) + 1);             // error here: "cannot refer non-final variable cabirthdate inside inner class defined in different method             //get same error for, cabirthdate , idaysalive         }     });     btncalculate.setfont(new font("calibri", font.bold, 12));     btncalculate.setbounds(188, 187, 89, 23);     frame.getcontentpane().add(btncalculate);      jtextfield_result = new jtextfield("total days alive: " + idaysalive);     jtextfield_result.setbounds(150, 233, 170, 20);     frame.getcontentpane().add(jtextfield_result);     jtextfield_result.setcolumns(10); 

if move calender , integer variable inside actionlistener can't access idaysalive variable in final textfield.

a solution create class implements action listener. can give tha class access variable needed:

class actionhandler implements actionlistener {  public actionhandler (mainclass mainclass) {     //now getters of main class can called   }     public void actionperformed(actionevent e) { } }