Starting/Stopping while loop with JButton

Question

I am trying to make a program that has a toggle button (regular JButton) that when clicked, runs a while loop that runs until the button is clicked again to stop it.

I have done this, however, when I click the button, the entire JFrame freezes because of it being stuck in the while loop, as the loop will run forever until the button is pressed again. However, it is impossible to click the button again because the JFrame freezes. The button itself also just stays blue because the JFrame freezes before the colour change occurs; right before I click the button.

My code looks something like this:

   boolean isRunning=false;
   private void buttonClickEvent(ActionEvent evt) {                           
    if(isRunning){
        isRunning=false;
        System.out.println("Stopped running!");
        jButton.setText("Start Running");
    } else { // BELOW IS THE CODE THAT CAUSES IT TO LOCK
        isRunning=true;
        jButton.setText("Stop Routine");
        while(isRunning){
            // DO STUFF
        }
    }

}   

EDIT: I tried doing the following code (below) and it does print the text and allow the colour change to occur in the button, but the UI still freezes quickly afterward.

boolean isRunning=false;
   private void buttonClickEvent(ActionEvent evt) {                           
    if(isRunning){
        isRunning=false;
        System.out.println("Stopped running!");
        jButton.setText("Start Running");
    } else { // BELOW IS THE CODE THAT CAUSES IT TO LOCK
        isRunning=true;
        jButton.setText("Stop Routine");
                    new Thread(new Runnable() {
            public void run() {
                SwingUtilities.invokeLater(new Runnable() {
                    public void run() {
                        while(isInRoutine){
                            System.out.println("lolk");
                        }
                    }
                });

            }
        }).start();
    }

}