Java™ How To Program (Early Objects), Tenth Edition

23.11.2 Processing Intermediate Results: Sieve of Eratosthenes

We’ve presented an example that uses the SwingWorker class to execute a long process in a background thread and update the GUI when the process is finished. We now present an example of updating the GUI with intermediate results before the long process completes. Figure 23.26 presents class PrimeCalculator, which extends SwingWorker to compute the first n prime numbers in a worker thread. In addition to the doInBackground and done methods used in the previous example, this class uses SwingWorker methods publish, process and setProgress. In this example, method publish sends prime numbers to method process as they’re found, method process displays these primes in a GUI component and ...