winforms data matrix reader

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Some care should be exercised when writing constructors for non-final classes, since the object that is constructed might be a subclass instance Example 912 shows a situation where use of overridden methods in superclass initializers and constructors can give unexpected results The example intentionally uses the this reference to underline the fact that the instance methods and constructors are invoked on the current object, and that the constructor call results in the initialization of the object state, as expected The program output shows that the field superValue at (1) in class SuperclassA never gets initialized explicitly when an object of the SubclassB is created at (8) The SuperclassA constructor at (2) does have a call to a method that has the name doValue at (3) A method with such a name is defined in the class SuperclassA at (4), but is also overridden in SubclassB at (7) The program output indicates that the method doValue() from the SubclassB is called at (3) in the SuperclassA constructor The implementation of the method doValue() at (4) never gets executed when an object of the SubclassB is created Method invocation always determines the implementation of the method to be executed, based on the actual type of the object Keeping in mind that it is an object of SubclassB that is being initialized, the call to the method named doValue at (3) results in the method from SubclassB being executed This can lead to unintended results The overriding method doValue() at (7) in the class SubclassB can access the field value declared at (5) before its initializer expression has been executed; ie, the method invoked can access the state of the object before this has been completely initialized

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Example 912 Initialization under Object State Construction class SuperclassA { protected int superValue; // (1) SuperclassA() { // (2) Systemoutprintln("Constructor in SuperclassA"); thisdoValue(); // (3) } void doValue() { // (4) thissuperValue = 911; Systemoutprintln("superValue: " + thissuperValue); } } //_______________________________________________________________________________ class SubclassB extends SuperclassA { private int value = 800; // (5) SubclassB() { // (6) Systemoutprintln("Constructor in SubclassB"); thisdoValue(); Systemoutprintln("superValue: " + thissuperValue); } void doValue() { // (7) Systemoutprintln("value: " + thisvalue); } } //_______________________________________________________________________________ public class ObjectInitialization { public static void main(String[] args) { Systemoutprintln("Creating an object of SubclassB"); new SubclassB(); // (8) } }

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Output from the program:

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PACKET OR PACKET Both transmission and IP people speak of packets Over the years, I ve learned that the two cultures may be using the word packet in quite different contexts, and assuming they have consensus when none exists In the 1970s, both IP and telecommunications cultures recognized the value of statistically multiplexed, shared networks They both recognized that packets, as units of information above the bit level, were useful to describe the elements of work the network needed to distribute IP architecture, however, progressed based on the end-to-end assumption, in which the greatest intelligence (for example, retransmission) was at the endpoints, there was no strong distinction between user and provider networks, user and provider networks would use comparable (router) technology, and there was not necessarily a centrally planned topology The contrasting telecommunications model was, at first, the X25 protocol, whose behavior mimicked the circuit-switched telephone network, but sending packets rather than digitized speech X25 proper was a protocol family for access to the provider edge, and was not intended for internal provider use The separate but related X75 protocol implemented interprovider connectivity The network, not the end hosts, was responsible for retransmission While we called both X25 and IP networks packet switching, the internals of provider networks were quite different While IP was consciously independent of the underlying transmission system, X25 was intended to deal with the speed, delay, and error performance characteristics of analog transmission systems Incidentally, I still find niche applications for X25 in special cases, such as high-frequency radio or telephone systems in developing countries, where these performance characteristics still apply X25 is by no means something to be discarded As carrier networks moved to digital and optical transmission systems, their performance characteristics changed to a model where it was accepted that errors would be extremely rare, and that endpoint-oriented retransmission, much as in IP, was more appropriate The broadband ISDN (B-ISDN) architectural effort gave us ATM, ISDN, and frame relay These technologies, with respect to user services provided, were generically called fast packet They remained fundamentally circuit-switched services; they were packet-switched only in the sense that they supported statistical multiplexing and were fast in the sense that they had less protocol overhead than X25 They did not have the topological flexibility of IP When many telecommunications people speak of providing packet services, they are thinking about a model such as Frame Relay, not routed networks In parallel with the telecommunications evolution, the IP world realized that certain applications needed much more control than traditional routing provided They initiated various schemes that permitted traffic engineering, such as Multiprotocol Label Switching (MPLS) These schemes have significant similarities to traditional circuit switching, but with more internal control and topological flexibility.

Creating an Constructor value: 0 Constructor value: 800 superValue: object of SubclassB in SuperclassA in SubclassB 0

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