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I want to programmatically move a Thread in another method. How I can do this?
that's entirely not possible in Java.
There are some ways around that - using tools like AtomicReferences, AtomicBoolean, wait/notify or Channels. With these tools, you could inform the other thread that it should do something specific.
Another approach would be to copy SwingUtilities invokeLater - like here: http://www.javamex.com/tutorials/threads/invokelater.shtml
However, I would like to ask the question why that method execution needs to be run in a specific thread? Wouldn't just another (new thread) be fine too? That should significally simplify your problem. In that case, just start a new thread to call that method
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I'm looking for a way to thread the ViewModels in a MVVM Architecture, without having to use tasks everywhere.
My ideal solution would be :
1 Application Thread (with the view)
1 Background Thread (with the viewModel)
Message passing between the 2
ViewModels still behave as normal Java Classes w/o Tasks/Service/Platform.runlater in every method
Is there a way to do this without bloating the code ?
This is probably not going to work the way you would like it to work. The view-models normally communicate with the views via bound properties. Therefore the properties of the view-models must always be updated on the application thread.
The proposed JavaFX way of dealing with concurrent background activities is to use Services. But if you don't like that it maybe worth it to have a look here: https://github.com/ReactiveX/RxJavaFX
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I understand we can do this with file input and output, but why would we want to do this?
It is simply called persistence.
You nailed it: you want to be able to store information (for example after intensive computations) in a way that survives the lifetime of the current JVM process.
In that sense serialization is a (poor) version of database storage.
But of course, that comment is correct: this does not prevent the creation of objects. It is a mechanism to resurrect previous state into "new" objects.
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So, I just finished my first program, but I haven't use any methods in it, since I'm just beginning to learn how to use them. Here's the original code : http://codepad.org/JiBfJI8Q I started to fractionate it but realised that it would be a method inside another all the way down. Is that actually the way to do it, or did I get the idea wrong?
without having looked at your code:
The general idea of methods is to separate small
portions of code which might be used at multiple other places in your code.
so yes, calling methods from within other methods is a good thing to do.
ideally your so called "composed methods" read out like a little story:
public void transaction(){
openDatabaseConnection();
addRecordsToDatabase();
closeDataseConnection();
}
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For example in some Java programs we use main method at below the class
in some Java programs we use main method after at writing methods what is the difference?
There is no difference if we write main method first or last. All the java programs starts the execution from the main class and it is independent from position (first or last).
there is no different, but you have to put all methods in a class...
you can read the manual :-) https://docs.oracle.com/javase/tutorial/getStarted/application/
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I am looking to create a custom EventProcessors in Disruptor but the documentation is very minimal. (https://code.google.com/p/disruptor/wiki/DisruptorWizard) How is this done. What are the concepts behind it and what are the issues and pitfalls?
Your question is very broad, so is my answer.
the concept behind the event processor is that it processes one event at a time in a single thread.
the issue is that you must decompose you system into asynchronous events.
pitfalls: it may be much more complicated than you need unless you really need millions of events per second. (And this is pretty rare out side HFT)