Replace JLabel text multiple times on JButton action

Question

When a JButton is clicked I need to empty the JLabel using setText. Inside actionPerformed, I have another Java class call.

If it returns an exception, then I have to change the label to setText("Error occurred").

If it returns the result, I have to change the same label to setText("Process completed").

I tried to generate an exception and it worked fine, but when I click the button again the text is not replaced with the empty string. Instead, it still shows "error occurred".

Please see the code below and let me know what I need to change.

btnConvert.addActionListener(new ActionListener() {
    public void actionPerformed(ActionEvent e) {
        
        label1.setText("");

        if(lblSource.getText().isEmpty()) {
            label2.setText("You have missed to select!! Please select it");
        }
        else {
            label1.setText("processing... ");
            VelConverter v = new VelConverter(locations);
            String response = v.convert();
            if(response.startsWith("Exception")) {  
                //code
                label1.setText("Error Occurred");
                
            }
            else {
                //code
                label1.setText("Completed");
            }
        }
    }

Answer 1

Thanks Rocco and Andrew Thomson. Your suggestion about concurrency made me to research on Swing worker. I just separated the threads using Swing worker and I were able to achieve my requirement.

This link made me to understand Swing worked in simple terms. https://www.geeksforgeeks.org/swingworker-in-java/