visual basic 2010 barcode generator The Constructor in Java

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The Constructor
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The constructor for a BillData object simply initializes the URL and Image variables with the two parameters passed in Initializing the pixel array is done in a separate method, because it is very processor-intensive This gives the applet a chance to only initialize the pixel array when it needs it
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initPixels( )
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The initPixels( ) method creates the pixel array from the image using the Java core class: javaawtimagePixelGrabber
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The Code
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Here is the source code for the BillData class: import javanet*; import javaawt*; import javaawtimage*; public class BillData { public URL link; public Image image; public int[] image_pixels;
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public BillData(URL link, Image image) { thislink = link; thisimage = image; } public void initPixels(int image_width, int image_height) { image_pixels = new int[image_width * image_height]; PixelGrabber pixel_grabber = new PixelGrabber(imagegetSource(), 0, 0, image_width, image_height, image_pixels, 0, image_width); try { pixel_grabbergrabPixels(); } catch (InterruptedException e) { image_pixels = null;
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BillTransitionjava
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The BillTransition class is used as a base class for other transition classes These other classes create transition cells between two individual billboard images This abstract class contains variables and methods that are common to all transitions There are no constructors provided in the BillTransition class This is because the applet does not use "new" to create new instances and instead uses the factory method, javalangClassnewInstance( ) Objects created in this way have no way to directly initialize themselves using parameters in constructors This factory method indirectly creates objects using a default constructor, one without any parameters The BillTransition class provides a number of overloaded init( ) methods to initialize instances with parameters In previous versions of DynamicBillboard, Robert used static variables within different transition classes to store data that only needed to be initialized once It was discovered, however, that when more than one instance of the applet ran from a web server, the applets would share the static variables This led to some problems if one applet needed a different static value than the other when the applets were different sizes An example is the FadeTransition class used to create an array whose size depended on the dimensions of the applet When another DynamicBillboard was created with dimensions that were smaller than the previous applet, it would overwrite this array with an array too small for the first applet This would cause the first applet to crash Robert introduced the static hash table called object_table in this version of the applet to work around this problem Now transition classes can store data inside this hash table using the transition name in conjunction with the applet size as a key When this data needs to be used, the applet can look to see if it exists for the applet's size within the hash table If it does not, then it can create the data and store it in the hash table for later use Now if there is more than one applet on a web server and both are the same size, then only one has to initialize the data
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init( )
The init( ) method is overloaded three times The first method, which has three parameters, is abstract and must be overridden by classes derived from this class The other two methods initialize data members within this class Robert's intention was to have the init( ) method of classes that are derived from this class call one of these two methods to initialize data members of BillTransition
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createCellFromWorkPixels( )
The createCellFromWorkPixels( ) method is used to perform the common task of converting the work_pixels array into an Image object Notice that it uses the owner variable to complete this task This is the only reason the owner variable is needed by transition classes When a transition has completed assembly of a new cell in the work_pixels array, it should call this method
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