Platform runLater and Task in JavaFX

Question

I have been doing some research on this but I am still VERY confused to say the least   Can anyone give me a concrete example of when to use Task and when to use Platform runLater Runnable    What exactly is the difference  Is there a golden rule to when to use any of these   Also correct me if I m wrong but aren t these two  Objects  a way of creating another thread inside the main thread in a GUI  used for updating the GUI

User · Answer

Platform runLater  If you need to update a GUI component from a non-GUI thread  you can use that to put your update in a queue and it will be handled by the GUI thread as soon as possible  Task implements the Worker interface which is used when you need to run a long task outside the GUI thread  to avoid freezing your application  but still need to interact with the GUI at some stage    If you are familiar with Swing  the former is equivalent to SwingUtilities invokeLater and the latter to the concept of SwingWorker   The javadoc of Task gives many examples which should clarify how they can be used  You can also refer to the tutorial on concurrency

User · Answer

One reason to use an explicite Platform runLater   could be that you bound a property in the ui to a service  result  property  So if you update the bound service property  you have to do this via runLater     In UI thread also known as the JavaFX Application thread           listView itemsProperty   bind myListService resultProperty           in Service implementation  background worker        Platform runLater    - gt  result add  Element     finalI

User · Answer

It can now be changed to lambda version   Override public void actionPerformed ActionEvent e        Platform runLater    - gt            try                 an event with a button maybe             System out println  button is clicked              catch  IOException   COSVisitorException ex                Exceptions printStackTrace ex

User · Answer

Use Platform runLater      for quick and simple operations and Task for complex and big operations     Use case for Platform runLater      Use case for Task  Task Example in Ensemble App   Example  Why Can t we use Platform runLater      for long calculations  Taken from below reference    Problem  Background thread which just counts from 0 to 1 million and update progress bar in UI   Code using Platform runLater         final ProgressBar bar   new ProgressBar    new Thread new Runnable          Override public void run         for  int i   1  i  lt   1000000  i              final int counter   i          Platform runLater new Runnable                  Override public void run                     bar setProgress counter   1000000 0                                      start         This is a hideous hunk of code  a crime against nature  and   programming in general   First  you   ll lose brain cells just looking   at this double nesting of Runnables  Second  it is going to swamp the   event queue with little Runnables     a million of them in fact    Clearly  we needed some API to make it easier to write background   workers which then communicate back with the UI    Code using Task    Task task   new Task lt Void gt           Override public Void call             static final int max   1000000          for  int i   1  i  lt   max  i                  updateProgress i  max                     return null            ProgressBar bar   new ProgressBar    bar progressProperty   bind task progressProperty     new Thread task  start         it suffers from none of the flaws exhibited in the previous code   Reference    Worker Threading in JavaFX 2 0

[java] Platform.runLater and Task in JavaFX

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