java - How can I access this variable inside of an ActionListener? - 


public class daysalivegui {      public static void main(string[] args) {         eventqueue.invokelater(new runnable() {             public void run() {                 try {                     daysalivegui window = new daysalivegui();                     window.frame.setvisible(true);                 } catch (exception e) {                     e.printstacktrace();                 }             }         });     }      public daysalivegui() {         initialize();     }      private void initialize() {          jbutton jbutton_calculate = new jbutton("calculate");         jbutton_calculate.addactionlistener(new actionlistener() {             public void actionperformed (actionevent arg0) {                  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;                  calendar cabirthdate = new gregoriancalendar(iyearbirth, imonthbirth - 1, idaybirth);                 calendar cacurrentdate = new gregoriancalendar(iyearcurrent, imonthcurrent - 1, idaycurrent);                  idaysalive = cacurrentdate.gettimeinmillis() - cabirthdate.gettimeinmillis();     idaysalive = idaysalive / (24 * 60 * 60 * 1000) + 1;             }         });          jbutton_calculate.setfont(new font("calibri", font.bold, 15));         jbutton_calculate.setbounds(180, 205, 103, 23);         frame.getcontentpane().add(jbutton_calculate);          /* here error:            idaysalive cannot resolved variable*/         jlabel lbldaysalive = new jlabel("days alive: " + idaysalive);          lbldaysalive.setfont(new font("calibri", font.bold, 18));         lbldaysalive.setbounds(135, 257, 147, 21);         frame.getcontentpane().add(lbldaysalive);      } }

you declaring idaysalive inside action listener line

        double idaysalive;

if declared inside action listener can't use outside.

you need define idaysalive somewhere can accessed inialize function. suggest making field of class.


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