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Java float, long, BigDecimal, and BigInteger convert to AS3 Number. Date, Time, and Timestamp (from the java.sql package) and java.util.Calendar map to AS3 Date. In AS3, true and false strings can also represent a Boolean value. Dense arrays are those that have no holes. As an example, if an array has four elements and I put the fifth element at position 9, then in a sparse array (the opposite of a dense array) there will be no values, what I call holes, in position 4 to 8. ActionScript sparse arrays tally with java.util.Map to avoid sending null values across. Depending on the interface type at the Java end, a dense ActionScript array maps to an implementation type. For example, List and Collection become ArrayList, Set becomes HashSet, and SortedSet becomes TreeSet. Typed associations can be established between custom types with the help of corresponding bean type classes on each side and the [RemoteClass] metadata tag. Our simple example uses such a mapping.

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In the case of custom type associations, it s possible to include extra properties in the bean type object as far as the existing ones on the source (i.e., the server) match the other properties in the ActionScript type. For example, you may have an object represent an order with a single line item. In such an object, you may want the serializable object to contain the unit price of the item and the quantity of the item, but not the total value (which is essentially a product of the other two properties). You may want the AS3 type to have a third property to hold the total value, which you could calculate by multiplying the other two property values. If you did this and made this AS3 object the associated counterpart of the Java object (which effectively has one property less), nothing would break; everything will still work fine. It s advisable to follow this technique and reduce the serialization overhead, especially when derived and calculated values are involved. Serialization and deserialization with transmission over AMF is a very efficient process and beats almost all other transmission alternatives. I mentioned earlier on that I would be covering two more special topics related to remoting. This section dealt with one, and now we will move on to the other asynchronous communication, the only style that Flex adopts.

Anyway, so far as our own model is concerned, the two subtype categories collapse into one. Indeed, we think subtypes should always be more constrained than their supertypes. In fact, we argue in The Third Manifesto that logically constraining supertypes is the only logically correct way to define subtypes! And Liskov and Wing seem to like the approach too: [We] prefer the constraint approach ... The constraint approach is appealing because it is simple and direct ... [Including] constraints in specifications makes for a more robust methodology ... Being able to state everything declaratively seems like a particularly important advantage of the constraint aproach. Note: Actually, the foregoing remarks apply, not to constrained subtypes as such, but rather to what Liskov and Wing call the constraint approach to defining subtypes. However, the two concepts are very much interrelated, and I don t think I m misrepresenting at least, I hope I m not misrepresenting the authors position here. If I m wrong, I hope they ll accept my apologies. Given the foregoing, it s interesting to note that James Rumbaugh, in his article A Matter of Intent: How to Define Subclasses (Journal of Object-Oriented Programming, September 1996) which I quoted earlier, as you might recall says almost exactly the opposite: [Most] object-oriented languages do not want objects to change class ... [This] suggests [a] design principle for classification systems: A subclass should not be defined by constraining a superclass. Hmmm ...

A typical drum has a shell made of wood covered with a plastic wrap, a chromed steel hoop holding down a white plastic skin at both ends, and bolts holding the whole thing together The shell can be made from a cylinder object; but make sure the Cap Ends option isn t selected in the Add Cylinder popup dialog, because you want your wooden drum shell to be hollow, like the real thing As for size, the default cylinder radius of 100 and depth of 200 will do fine You can make the plastic skin by choosing Add Mesh Circle from Blender s spacebar pop-up menu The default circle radius of 10 matches the size of the cylinder you created; make sure the Fill button is selected, or the circle will be just an outline.

All types of communication in the Flex framework are asynchronous. This has its advantages but also poses some challenges. To list a few, some advantages are as follows:

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