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If you only plan to display simple pins in your application, the basic map annotations are the way to go. They re simple to use, and you can quickly integrate them with any application. The example code in this section uses the code you created in the reverse geocoding section as a base. The first thing you must do when annotating a map is make the calling class implement the MKMapViewDelegate protocol. To add annotations to the map, you need to implement only one of the delegate methods. Listing 17.1 shows how you can use the reverse geocoder code to drop a pin at the center of the map.

System.gc();

Theoretically, after calling System.gc(), you will have as much free memory as possible. We say theoretically because this routine does not always work that way. First, the JVM you are using may not have implemented this routine; the language specification allows this routine to do nothing at all. Second, another thread (again, see 9) may perform a substantial memory allocation right after you run the garbage collection. This is not to say that System.gc() is a useless method it s much better than nothing. You just can t rely on System.gc() to free up enough memory so that you don t have to worry about the garbage collector being run. The certification exam is interested in guaranteed behavior, not probable behavior. Now that we are somewhat familiar with how this works, let s do a little experiment to see if we can see the effects of garbage collection. The following program lets us know how much total memory the JVM has available to it and how much free memory it has. It then creates 10,000 Date objects. After this, it tells us how much memory is left and then calls the garbage collector (which, if it decides to run, should halt the program until all unused objects are removed). The final free memory result should indicate whether it has run. Let s look at the program:

An interesting mental conundrum crops up with the introduction of singlemode fiber. The core of single-mode fiber is significantly narrower than the core of multimode fiber. Because it is narrower, it would seem that its capability to carry information would be reduced due to its limited lightgathering capability. This, of course, is not the case. As its name implies, it enables a single mode or ray of light to propagate down the fiber core, thus eliminating the intermodal dispersion problems that plague multimode fibers.

1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. import java.util.Date; public class CheckGC { public static void main(String [] args) { Runtime rt = Runtime.getRuntime(); System.out.println("Total JVM memory: " + rt.totalMemory()); System.out.println("Before Memory = " + rt.freeMemory()); Date d = null; for(int i = 0;i<10000;i++) { d = new Date(); d = null; } System.out.println("After Memory = " + rt.freeMemory()); rt.gc(); // an alternate to System.gc() System.out.println("After GC Memory = " + rt.freeMemory());

Listing 17.1 Dropping a pin on the center of the map Starts geocoder when button is pressed Adds placemark to map

15. 16.

Now, let s run the program and check the results:

Downloaded from Digital Engineering Library @ McGraw-Hill (www.digitalengineeringlibrary.com) Copyright 2004 The McGraw-Hill Companies. All rights reserved. Any use is subject to the Terms of Use as given at the website.

- (IBAction) dropPin:(id) sender { MKReverseGeocoder * geoCoder = [[MKReverseGeocoder alloc] initWithCoordinate:theMap.centerCoordinate]; [geoCoder setDelegate:self]; [geoCoder start]; } - (void)reverseGeocoder:(MKReverseGeocoder *)geocoder didFindPlacemark:(MKPlacemark *)placemark { [mapView addAnnotation:placemark]; }

As we can see, the VM actually did decide to garbage collect (i.e. delete) the eligible objects. In the preceding example, we suggested to the JVM to perform garbage collection with 458,048 bytes of memory remaining, and it honored our request. This program has only one user thread running, so there was nothing else going on when we called rt.gc(). Keep in mind that the behavior when gc() is called may be different for different JVMs, so there is no guarantee that the unused objects will be removed from memory. About the only thing you can guarantee is that if you are running very low on memory, the garbage collector will run before it throws an OutOfMemoryException.