java - How to add a Text into a List from another Client or Server? -

i trying program own chat can't text 1 client next. have chat list can't add it. if know how solve or have idea might work, love hear it.

public class sendaction implements actionlistener {      private jbutton sendbutton;     private jbutton sendbuttonserver;     private jtextfield text;     private jlabel label;     static arraylist<string> textlist = new arraylist<string>();     static arraylist<string> textlistserver = new arraylist<string>();     private string chattext;      public sendaction(jbutton sendbutton) {         this.sendbutton = sendbutton;         this.sendbuttonserver = sendbuttonserver;     }      public sendaction(jtextfield text) {         this.text = text;     }      public sendaction(jlabel label) {         this.label = label;     }      public void actionperformed(actionevent e) {         string action = e.getactioncommand();          if (e.getsource() == p2pchatclient.sendbutton) {             if (p2pchatclient.text.gettext().equals("")) {             } else {                 textlist.add("client: " + p2pchatclient.text.gettext());                 system.out.println("eingegebene arraylist elements: "                         + textlist);                 chattext = string.join("  |  ", textlist);                 p2pchatclient.label.settext(chattext);                  p2pchatclient.text.settext(null);             }         }          if (e.getsource() == p2pchatserver.sendbuttonserver) {             if (p2pchatserver.textserver.gettext().equals("")) {             } else {                 textlistserver.add("server: "                         + p2pchatserver.textserver.gettext());                 system.out.println("eingegebene arraylist elements: "                         + textlistserver);                 chattext = string.join("  |  ", textlistserver);                 p2pchatserver.labelserver.settext(chattext);                  p2pchatserver.textserver.settext(null);             }         }     } } 

another class:

public class chatserversocket extends thread {     private int port;     private p2pchatserver servergui;     private datainputstream instream;     private dataoutputstream outstream;      public chatserversocket(int port, p2pchatserver servergui) {         this.port = port;         this.servergui = servergui;     }      public void run() {         serversocket server = null;         try {             server = new serversocket(port);         } catch (exception e) {             system.out.println("fehler: " + e.tostring());         }         socket client;          while (true) {             try {                 client = server.accept();                  inputstream in = client.getinputstream();                 outputstream out = client.getoutputstream();                 instream = new datainputstream(in);                 outstream = new dataoutputstream(out);                  while (true) {                     string utf = instream.readutf();                      // file file = new file(utf);                     // if (file.isfile()) {                     // file.delete();                     // }                      sendaction.textlistserver.add(utf);                      // servergui.setmessage(utf);                 }             } catch (ioexception ioe) {                 system.out.println("server fehler: " + ioe.tostring());             }         }     }      public void sendtext(string message) {         // p2pchatserver.send();         try {             if (message != null) {                 outstream.writeutf(message);             }         } catch (ioexception ioe) {             system.out.println("fehler beim senden im server: "                     + ioe.tostring());         } catch (nullpointerexception npe) {             system.out.println("fehler beim senden im client: "                     + npe.tostring());         }     } } 

and another:

public class chatclientsocket extends thread {     private string ip;     private int port;     private p2pchatclient client;     private datainputstream instream;     private dataoutputstream outstream;      public chatclientsocket(string ip, int port, p2pchatclient client) {         this.port = port;         this.ip = ip;         this.client = client;     }      public void run() {         try {             socket clientsocket = new socket(ip, port);              inputstream in = clientsocket.getinputstream();             outputstream out = clientsocket.getoutputstream();              instream = new datainputstream(in);             outstream = new dataoutputstream(out);              while (true) {                 string utf = instream.readutf();                  sendaction.textlist.add(utf);                  // client.setmessage(utf);             }         } catch (unknownhostexception uhe) {             system.out.println("client fehler: " + uhe.tostring());         } catch (ioexception ioe) {             system.out.println("client fehler: " + ioe.tostring());         }     }      public void sendtext(string message) {         try {             if (message != null) {                 outstream.writeutf(message);             }         } catch (ioexception ioe) {             system.out.println("fehler beim senden im client: "                     + ioe.tostring());         } catch (nullpointerexception npe) {             system.out.println("fehler beim senden im client: "                     + npe.tostring());         }     } } 

i used textarea. seteditable cant edit , scrollarea make scrollable u know.

textarea.seteditable(false);         scrollarea = new jscrollpane(textarea);