swing - Java GUI - JList won't display -


i've encountered bit of weird issue. there's part of program sets , updates list , displays fine, when use same code in part of program, doesn't.

so i'm trying display list of names in jlist when button clicked (after program run , frame loaded), , jlist component refuses display anything.

the difference in working set of code , one, code in try catch (which needed client server code). know it's not client server issue, need try catch part of code.

here code (the commented out stuff of attempts @ fixing issue, no avail yet):

jlist<string> lreceivedlclient1files = new jlist<string>();  //string[] fakelist = new string[1]; //fakelist[0] = "no files display yet"; //lreceivedlclient1files.setlistdata(fakelist);  jbutton btnfilelist = new jbutton("request file list"); btnfilelist.addactionlistener(new actionlistener() {     @override     public void actionperformed(actionevent e)      {         try         {              ////other client server code here////              int counter = 0;             (int = 0;i<nameslist.length;i++)             {                 leechersocket.receive(thenamepacket);                 thename = new string(thenamebuffer);                  nameslist[counter] = thename;                 counter+=1;             }              lreceivedlclient1files.setlistdata(nameslist);             //lreceivedlclient1files.setmodel(nameslist);             //lreceivedlclient1files = new jlist(nameslist);             //validate();         }         catch (unknownhostexception e1)          {             e1.printstacktrace();         }          catch (socketexception e1)          {             e1.printstacktrace();         }          catch (ioexception e1)         {             e1.printstacktrace();         }     } });  leecherpanel.add(lblfilelist); leecherpanel.add(btnfilelist); leecherpanel.add(lreceivedlclient1files);  add(leecherpanel);  pack();

is there way around this?

i think problem you're trying create instance of interface:

btnfilelist.addactionlistener(new actionlistener() { @override public void actionperformed(actionevent e) {...

see docs on actionlistener

what want create nested class implements actionlistener (remember implement interfaces, whereas extend classes). example of doesn't work in similar way yours:

import java.awt.*; import javax.swing.*; import java.awt.event.*;  public class buttontest {     jbutton button;      public static void main(string[] args) {         buttontest gui = new buttontest();         gui.go();     }      public void go() {         jframe frame = new jframe("button test");         button = new jbutton("clik meh pl0x");          button.addactionlistener(new actionlistener() {             public void actionperformed(actionevent e) {                 string buttontext = button.gettext();                 buttontext += " <teehee>";                 button.settext(buttontext);             }         });          frame.getcontentpane().add(borderlayout.north, button);         frame.setsize(1000,100);         frame.setvisible(true);         frame.setdefaultcloseoperation(jframe.exit_on_close);      } }

how fix nested class:

import java.awt.*; import javax.swing.*; import java.awt.event.*;  public class buttontest {     jbutton button;      public static void main(string[] args) {         buttontest gui = new buttontest();         gui.go();     }      public void go() {         jframe frame = new jframe("button test");         button = new jbutton("clik meh pl0x");          button.addactionlistener(new buttonlistener());          frame.getcontentpane().add(borderlayout.north, button);         frame.setsize(1000,100);         frame.setvisible(true);         frame.setdefaultcloseoperation(jframe.exit_on_close);      }      public class buttonlistener implements actionlistener {         public void actionperformed(actionevent e) {                 string buttontext = button.gettext();                 buttontext += " <teehee>";                 button.settext(buttontext);         }     } }

screenshot of output after compiling, running, , several clicks:

picture


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