Create 2 threads and communicate between them

Question

I want to make a background task in one thread and send information from that thread to another thread which runs the main program and update the information each period of time.

Thread1:

public void doTask()
{
    // ...
    someData = ...;
}

Thread2:

SwingUtilities.invokeLater(new Runnable()
{
    public void run()
    {
        new MainFrame(someData);
    }
});

How could I achieve this in java?

Answer 1

Use the Java Concurrency API. Usage of BlockingQueues, Future<> will help you.

Note: This is a classic producer-consumer problem. This can be achieved having a shared queue to hold data where one thread will push data into the queue and the othe will consume the data. Proper synchronisation is needed to achieve a correct solution. BlockingQueue implementations like LinkedBlockingQueue will be helpful.

Update: Part of you problem [the consumer] can be derived from this answer of mine. But this solution uses the simpler wait-notify approach.

Answer 2

I using Executor/ExecutorService, output from these methods starting java.swing.Action (create a new EDT if doesn't exists),

or you can test that For EDT

if (SwingUtilities.isEventDispatchThread()) {...

both ways for your Wratever sould be always in EDT, I vote for wraps output to the GUI into Action