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Download Java threads by Scott Oaks; Henry Wong PDF

By Scott Oaks; Henry Wong

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Instead, methods like the setDone( ) method are executed by the Swing event-dispatching thread as it executes the actionPerformed() method within the SwingTypeTester class. As far as the virtual machine is concerned, thesetDone() method is just a series of statements; those statements do not "belong" to any particular thread. Therefore, the event-dispatching thread executes the setDone() method in exactly the same way in which it executes any other method. This point is often confusing to developers who are new to threads; it can be confusing as well to developers who understand threads but are new to object-oriented programming.

Interrupt( ); } }); ... } A similar example can be used to show why it is sometimes preferable to use the Runnable interface. Let's suppose that we want the character in our display canvas to move across the screen until the user types in the matching character. This requires another thread, one that controls the animation of the character. Every few milliseconds, the character needs to be redisplayed on the canvas just slightly to the right of where it was previously displayed. This makes the character appear to be moving.

We glossed over the details at the time, which may have given the implication that they are minor issues. However, we must understand that when two threads share data, complexities arise. These complexities must be taken into consideration whether we're implementing a large shared database or simply sharing a done flag. In this chapter, we look at the issue of sharing data between threads. , concurrently). In this chapter, we examine the concept of a race condition and mechanisms that solve the race condition.

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