Program freeze when calling Server method in Java -

i have basic gui in java there jbutton,i have given functionality start server button. when click button program freezes. because of while loop? if how can overcome this?

server code

 void connect_clients() {     try {         serversocket listener = new serversocket(7700);         try {             while (true) {                 socket socket = listener.accept();                 try {                     printwriter out =                             new printwriter(socket.getoutputstream(), true);                     out.println(new date().tostring());                 }                  {                     socket.close();                 }             }         }         {             listener.close();         }     }     catch (ioexception ex) {         logger.getlogger(test_frame.class.getname()).log(level.severe, null, ex);     }    } 

your program freezing because blocking ui thread. need post on separate thread:

public void postlisten() {     new thread(new runnable()     {         public void run()         {             connect_clients();         }      }).start(); } 

call method instead , should run connect_clients() method on separate thread. new thread block until client connects.