Tricks of the Java Programming Gurus

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starting day

2011.01.24

 

Chapter 2 : Using the Media Tracker

in source code searching...

 

i just came upon such situation

 

public void run() {
    try {
        tracker.waitForID(0);
    } catch (InterruptedException e) {
        return;
    }
    
    repaint();
}

 

and as it says:

 

The run method is where the tracking actually starts taking place. The waitForID method of
MediaTracker is called within a try-catch clause. It must be placed in this exception handling
clause because an InterruptedException will be thrown if another thread interrupts this thread.
Recall that waitForID is synchronous , meaning that it won't return until all the images with the
specified identifier have been loaded. This means that the call to repaint will not occur until the
images have all been loaded.

 

you see, here why it calls the waitForID method is synchronous, no synchronous identifier was found attached before the method name according to the jdk1.6 javadoc...

so i think it just means it does not open another thread to do the work, so...it's synchronous, right!?

the related code will be put in another thread, see:

http://dracularking.iteye.com/blog/893957