Slow again(why in this case)

Question

few days back I posted a problem chat runs slow....... someone told me to use wait and notify to remove the cpu slow issue
here is how I solved
//server
public synchronized void settxt(String txt)  throws RemoteException{
           try{
                message=txt;
                notify();
           }catch(Exception e){
                System.out.println(e);
      public synchronized String gettxt()  throws RemoteException{
           try{
                wait();
           }catch(Exception e){
                System.out.println(e);
           return message;
//client
public void design(){
     setVisible(true);
              send.addActionListener(this);
         try{
               while(true){
                     clmessage=rmiServer.gettxt();
                     if((clmessage!=null) && (!prevtxt.equals(clmessage)) ){
                          texta1.append(clmessage+"\n");
                          prevtxt=clmessage;
           }catch(Exception e)
}Now I wrote another program and ran into similar problem, but this time wait and notify doesn't seems to be working.
program 2....
The program doesn't runs slow. The gui in the client side is not shown. When i remove and paste the code inside a button action. The program runs properly but when I press the button the client stops working.
//client
public void design(){
setVisible(true);
try{
     InetAddress thisIp = InetAddress.getLocalHost();
     while(true){
          String urworkfile=rmiServer.doihavawork(thisIp.getHostAddress()); //client checks if anyone called him
               System.out.println("this is ur work "+urworkfile);
  }catch(Exception ep){
                 System.out.println("error 31 "+ep);
//server
public synchronized String doihavawork(String n) throws Exception{
         wait();
          for(int i=0;i<callclientno;i++){
               if(callclient.equals(n) ){
               return callfordfilename[i];
     return "false";
Hope you understood
thanks                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           

Answer 1

i found the problem.... but I didn't understand why??
my main method was this:
public static void main(String []args){
              try {
               // UIManager.setLookAndFeel("org.jvnet.substance.skin.SubstanceBusinessBlackSteelLookAndFeel");
              } catch (Exception e) {
                System.out.println("Substance Raven Graphite failed to initialize");
              SwingUtilities.invokeLater(new Runnable() {
                public void run() {
                   new rmiclient().design();
}If I change the main method to this it works... could anyone explain what was going wrong and how can I use the Look&Feel
public static void main(String []args){
                   new rmiclient().design();
}