Java Swing API call makes UI freeze for duration of the request

Question

I want to fool arround with Java and especially the Swing library. I am having difficulies getting the hang of it tho.

On press of a button I am adding a new JInternalPanel to my UI which inside the constructor makes a 3rd party API call. The InternalFrame is not showing up for the duration of the API call, so basically the UI freezes completely for a few seconds.

How can this be solved? Is there any recommended way to archieve that?

Here is my simple code

public MarketView(){
    setTitle(TITLE);
    setSize(DEFAULT_SIZE);
    setMaximizable(true);
    setClosable(true);
    setIconifiable(true);
    setLayout(new BorderLayout());

    //this line here is causing the gui to freeze for duration of the 3rd party API call.
    System.out.println(this.api.getRestClient().getAllAssets().toString());
    show();
}

Updated my code based on some recommendations, still not sure if this is the proper way. Looks pretty verbose and somehow unesthetic to me.

public MarketView(){
    setTitle(TITLE);
    setSize(DEFAULT_SIZE);
    setMaximizable(true);
    setClosable(true);
    setIconifiable(true);
    setLayout(new BorderLayout());

    //this line here is causing the gui to freeze for duration of the 3rd party API call.
    new SwingWorker() {
        APIManager api = APIManager.getInstance();
        @Override
        protected List<TickerStatistics> doInBackground() throws Exception {
            List<TickerStatistics> ticker = api.getRestClient().getAll24HrPriceStatistics();
            return ticker;
        }

        @Override
        protected void done() {
            try {
                List<TickerStatistics> ticker = (List<TickerStatistics>) get();
                System.out.println(ticker);
            } catch (InterruptedException e) {
                throw new RuntimeException(e);
            } catch (ExecutionException e) {
                throw new RuntimeException(e);
            }
            System.out.println("Done");
        }
    }.execute();
    show();
}