Question

I haven’t used java in awhile and I am trying to do something like this in one main class:

// do stuff
this.label.setText("Status: IDLE");
// do things
this.label.setText("Status: LOADING..."); // set to loading right before file read
// read and parse huge file
this.label.setText("Status: DONE");

I want the label to show ‘loading…’ as the large file read is being executed but the label never freezes (as the job is being ran). How can I force the label to change during read? Do I need to use separate class/thread? Thanks in advance for your help.

Answer 1

How can I force the label to change during read? Do I need to use
separate class/thread?

Yes, you are right. The label and the class that is changing it’s value should be in different threads.

Have a look at SwingUtilities invokeLater:

Runnable newThread = new Runnable() {
     public void run() {
     }
 };

You can create a thread this way showed above.