Help with JProgressBar
I understand that there were a lot of posts and examples involving JProgressBar. I understood the concepts of threads too. I started implementing a simple application where the program actuallytries to get information from a database. As the retrieval takes some time, I want to display an indeterminate progress bar in a pop-up dialog box which gets disposed once the retrieval is done. Here is the code...
// CODE IN MY MAIN PROGRAM WHICH CALLS BOTH THE THREAD AND THE BACKGROUND PROCESS
myThread mT =new myThread("Please wait...!!!");
mT.start();
if (jComboBoxUserName.getSelectedIndex() > 0)
hardWareItems = dataIO.getHardWareInfo(argumentsList);// trying to retrieve information from the DB
else
hardWareItems = dataIO.getHardWareInfo("empty", sqlStmt);// trying to retrieve information from the DB
mT.pleaseStop();
// MYTHREAD CODE WHICH CALLS THE CLASS TO LOAD THE DIALOG BOX
class myThreadextends Thread{
String labelText;
boolean stillRunning =true;
LoadingWindow LW;
myThread(String labelText){
this.labelText = labelText;
LW =new LoadingWindow(labelText);
}
publicvoid run(){
Dimension screenSize = Toolkit.getDefaultToolkit().
getScreenSize();
Dimension frameSize = LW.getSize();
if (frameSize.height > screenSize.height){
frameSize.height = screenSize.height;
}
if (frameSize.width > screenSize.width){
frameSize.width = screenSize.width;
}
LW.setLocation((screenSize.width - frameSize.width) / 2,
(screenSize.height - frameSize.height) /
2);
LW.show();
while (this.stillRunning){
LW.repaint();
}
if (!this.stillRunning){
LW.dispose();
}
}
publicvoid pleaseStop(){
this.stillRunning =false;
}
}
// THE DIALOG BOX WHICH POPS UP CONTAINING THE LABEL AND PROGRESSBAR
publicclass LoadingWindowextends JDialog{
public LoadingWindow(String labelText){
this.labelText = labelText;
try{
jbInit();
}catch (Exception ex){
ex.printStackTrace();
}
}
privatevoid jbInit()throws Exception{
this.setSize(200,75);
jLabel1.setText("<html><b><align = center>"+labelText+"</b></html>");
this.getContentPane().setLayout(new GridLayout(2,0));
this.getContentPane().add(jLabel1);
this.getContentPane().add(jProgressBar1);
jProgressBar1.setIndeterminate(true);
this.repaint();
jProgressBar1.setStringPainted(true);
}
JLabel jLabel1 =new JLabel();
JProgressBar jProgressBar1 =new JProgressBar();
String labelText;
}
Everything is getting executed, the dialog box pops up... but I am not able to see the label and progressbar in it until the background process is completed. As far as I understand, it is a seperate thread, but still not updating. I would really appreciate if anyone could point out where I am going wrong.
