What is the correct way to make a thread return a value?

Question

I'm new to Java threads and after testing to see how they work, I can't figure out how to make them do calculations and return the result the way I want.

For example, in my current program, I want my thread to query a database by calling a method that returns the data in a Vector object when I click a JButton . Then, with that vector object, I want to add each index (an array) as a row in a JTable .

What would be the correct way to accomplish this? I know I could use a setter on my JTable in the calling class but I'm sure there has to be a more "correct" way.

Answer 1

Yes, use a SwingWorker . This mechanism is designed for situations where you need to have a long running task run in a background thread and provide updates to the UI either when done, or while processing. Since Swing is single-threaded, this allows the UI to remain responsive .

Answer 2

or basic workaround by impements Runnable where output to the GUI must be wrapped into invokeLater more about in Concurrency in Swing