Small problem in refreshing JFrame

Question

Please help me in sorting out this small problem. I called a function on a button click. In that function i tried to change the text on a button initially then i have some code to execute and then again i set other text to the same button. But iam not able to see the initial text while execution. It is as follows
jbut.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent ae)
connectServer(); //The function that i called
//conncetServer function
public void connectServer
jbut.setText("Please Wait");
// jbut.validate();
try{
Thread.sleep(10000);
}catch(Exception e)
jbut.setText("Disconnect");
// jbut.validate(); This i tried
But i am not able to see the please wait label on the screen i tried in several ways. can anyone of you tell me how to solve it..

Answer 1

Hi, Problem is Gui manages its own Thread, so once u invoke a process, until it finishes GUI won't get refreshed. 2 ways to handle it.
1. Either use SwingUtilities.invokeLater method
Example Code.
jbut.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent ae)
jbut.setText("Please Wait...");// set the text
Runnable connectServerThread = new Runnable(){
public void run()
connectServer();
jbut.setText("");// return back to normal.
SwingUtilities.invokeLater(connectServerThread);
or
2. Implement Runnable interface in ur class and invoke the same inside run method. It will definitely work since i checked it.
Example code.
Thread connectServerThread = null;
jbut.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent ae)
connectServerThread = new Thread(this);
connectServerThread.start();
public void run()
// set the label visible here.
jbut.setText("Please Wait...");
// invoke server process.
connectServer();
// hide the label or button here.
jbut.setText("");
Sreni.