Java Swing - GUI freezes when completing calculations after clicking a button

Question

I have created a scientific calculator program. What my program does is take \"label\" which is the string inputted by the user using buttons and evaluate the expression. What m

Answer 1

The solution is to:

1. Use a separate Thread and use SwingUtilities.inovkeLater() to place the text field updates on the EDT, or

2. Use a SwingWorker, which has a built in API to support the above to features.

Read the section from the Swing tutorial on Concurrency in Swing for complete information and working examples of a SwingWorker.

Answer 2

In the method where you call the calculations method, wrap the call in this:

    public void actionPerformed(ActionEvent e){      
    Thread t = new Thread(new Runnable() {
        public void run() {
            try {
                label2.setText(bracket(splitLabel(label.getText())));
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
    });
    t.start();
    }

this should solve the problem of the program freezing. if not pleasetell me

Answer 3

In stead of wrapping the call in a regular Thread, make use of Swingutilities. You will need to do this since Swing isn't threadsafe. This way you will still be working on the EDT.

 SwingUtilities.invokeLater(() -> {
                try {
                    label2.setText(bracket(splitLabel(label.getText())));
                } catch (Exception e) {
                    e.printStackTrace();
                }
            });