how to change jlabel text/color at runtime in swing aplicaiton

Question

I am working on project where I am doing three task on a button click which takes aprox. 2-3 mins I am changing jLabel's text using below code

lblStatus.setText( "Phase1 done successfully !!!, Phase2 started " );

but I get only "All phase done successfully !!!" text in jLabel after all run is completed.

Answer 1

If you run your long running task in the EDT, the UI freezes until your task is done. Therefore you should do the long running task in a background thread. Within the background thread you can use SwingUtilties.invokeLater()to update the UI. Example:

SwingUtilities.invokeLater(new Runnable() {
  @Override
  public void run() {
    lblStatus.setText( "Phase1 done successfully !!!, Phase2 started " );
}});

For more information see SwingUtilities.invokeLater() why is it needed?