Java implements multiple client chat programs

I reviewed Java for a day. In the evening, I wrote a heartchat 0.1 program to enable multiple clients to chat with each other.CodeAs follows:

 Import Java. Io .* ;  Import Java.net .* ;  Import Java. util .* ;  Public   Class  Heartserver {  /*  * Member variable debut  */  List <Clientthread> clients =New Arraylist <clientthread> ();  /**  * This is the portal. Check it out here ...*  @ Param  ARGs  */      Public   Static   Void  Main (string [] ARGs ){  New  Heartserver (). Start ();}  /**  * Starting the server ...* */      Public   Void  Start (){  Try  {  Boolean Iconnect = False  ; Serversocket SS = New Serversocket (1720 ); Iconnect = True  ;  While (Iconnect) {system. Out. println ( "The server port is successfully bound! " ); Socket s = SS. Accept (); clientthread currentclient = New Clientthread (s ); //  Create thread reference System. Out. println ("client found! " ); Clients. Add (currentclient );  //  Add the current client to the set                  New  Thread (currentclient). Start (); system. Out. println ( "The client process has been started! ");}}  Catch  (Ioexception e) {system. Out. println ( "Ioexception" ); E. printstacktrace ();}}  /**  * Leave a home (client process) for each client )*  */      Class Clientthread Implements  Runnable {  /*  * The member variable is coming again...  */         Private  Socket S;  Private  Datainputstream DIS;  Private  Dataoutputstream DOS;  Private  String STR;  Private   Boolean Iconnect = False  ;  /**  * Minor Structure  */ Clientthread (socket s ){  This . S = S; iconnect = True  ;}  Public   Void  Run () {system. Out. println ( "The run method is started! " );  Try  {  While  (Iconnect) {system. Out. println ( "The while loop starts in the run method and is waiting for the client to send messages ..."); DIS = New  Datainputstream (S. getinputstream (); Str = Dis. readutf (); system. Out. println (STR );  For ( Int I = 0; I <clients. Size (); I ++ ) {System. Out. println ( "Forwarding messages..." + I); clientthread C = Clients. Get (I); C. sendmsg (STR );}}}  Catch (Ioexception e) {e. printstacktrace ();}}  /**  * Forward messages. I am the master. * send messages sent to the server to each connected client.  */          Public   Void  Sendmsg (string Str ){  Try  {System. Out. println ( "Create an output pipeline! " ); DoS = New Dataoutputstream ( This . S. getoutputstream (); system. Out. println ( "Writing a message to the client! " ); Dos. writeutf (STR); system. Out. println ( "Message writing to client successful! " );}  Catch  (Ioexception e) {e. printstacktrace ();}}}} 

 Import Java. AWT .* ;  Import Java. AWT. event .* ;  Import Java. Io .* ; Import Java. Lang .* ;  Import Java.net .* ;  Public   Class Heartclient Extends  Frame {  /*  * Member method appearance...  */      Private  Textfield tftext;  Private  Textarea tacontent; Private  Socket S;  Private  Dataoutputstream DOS;  Private  Datainputstream DIS;  /**  * Note: The entry... ^ *  @ Param  ARGs  */      Public   Static   Void  Main (string [] ARGs ){ New  Heartclient (). launchframe ();}  /**  * Loading Gu  */      Public   Void  Launchframe () {tftext = New  Textfield (); tacontent = New  Textarea ();  This . Setsize (300,300 ); This . Setlocation (300,300 );  This . Tftext. addactionlistener ( New  Tflistener ());  This  . Add (tftext, borderlayout. South );  This  . Add (tacontent, borderlayout. North );  This . Addwindowlistener ( New  Windowadapter () {@ override  Public  Void  Windowclosing (invalid wevent e) {system. Exit ( 0 );}});  This  . Pack ();  This  . Connect ();  This . Setvisible ( True  );}  /**  * I am trying to connect to the server...  */      Public   Void Connect (){  Try  {S = New Socket ("127.0.0.1", 1720 ); DoS = New  Dataoutputstream (S. getoutputstream (); DIS = New  Datainputstream (S. getinputstream ());  New Thread ( New  Sendthread (). Start ();  // Dos. writeutf ("hello, I find u! "); } Catch  (Unknownhostexception e) {system. Out. println ( "Unknownhostexception" ); E. printstacktrace ();}  Catch  (Ioexception e) {system. Out. println ( "Ioexception" ); E. printstacktrace ();}  Finally  {  //  Disable Donnie... }}  /**  * Don't wait for tftext (the listener class of textfield tftext)  */      Class Tflistener Implements  Actionlistener {  Private  String STR; @ override  Public   Void  Actionreceivmed (actionevent e) {Str = Tftext. gettext (). Trim (); tftext. settext ( "");  Try  {Dos. writeutf (STR );}  Catch  (Ioexception E1) {system. Out. println ( "Ioexception" ); E1.printstacktrace ();}}}  /**  * The thread in which the client receives messages ...*  */      Class Sendthread Implements  Runnable { Private  String STR;  Private   Boolean Iconnect = False  ;  Public   Void  Run () {iconnect = True  ; Recmsg ();}  /**  * Message, look at moves, where to run... (implementation of the client to receive messages )*  @ Throws Ioexception  */          Public   Void  Recmsg (){  Try  {  While  (Iconnect) {Str = Dis. readutf (); tacontent. settext (STR );}}  Catch  (Ioexception e) {e. printstacktrace ();}}}}