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import javalangannotation*; import javalangreflect*; @Retention(RetentionPolicyRUNTIME) @interface MyAnno { String str(); int val(); } class Meta { // myMeth now has two arguments @MyAnno(str = "Two Parameters", val = 19) public static void myMeth(String str, int i) { Meta ob = new Meta(); try { Class c = obgetClass(); // Here, the parameter types are specified Method m = cgetMethod("myMeth", Stringclass, intclass); MyAnno anno = mgetAnnotation(MyAnnoclass); Systemoutprintln(annostr() + " " + annoval()); } catch (NoSuchMethodException exc) { Systemoutprintln("Method Not Found"); } } public static void main(String args[]) { myMeth("test", 10); } }

Take note that anything in the square brackets in this usage summary is optional Also, don t be intimidated by this long list of options! They are all quite easy to use and are described in Table 4-1

The output from this version is shown here: Two Parameters 19 In this version, myMeth( ) takes a String and an int parameter To obtain information about this method, getMethod( ) must be called as shown here:

Method m = cgetMethod("myMeth", Stringclass, intclass);

.

12:

Enumerations, Autoboxing, and Annotations (Metadata)

When two hosts on the same LAN want to communicate, it is quite easy for them to find each other: Simply send out an ARP message, get the other host s MAC address, and be done with it But when the second host is not local, things become trickier In order to get two or more LANs to communicate with one another, a router needs to be put into place The purpose of the router is to know about the topology of multiple networks When you want to communicate with another network, your machine will set the destination IP as the host on the other network, but the destination MAC address will be for the router This allows the router to receive the packet and examine the destination IP, and since it knows that IP is on the other network, it will forward the packet The reverse is also true for packets that are coming from the other network to our network (see Figure 11-9) In turn, the router must know what networks are plugged into it This information is called a routing table When the router is manually informed about what paths it can take, the table is called static, thus the term static routing Once routes are plugged into the routing table by a human, they cannot be changed until a human operator comes back to change them Unfortunately, commercial grade routers can be rather expensive devices They are typically dedicated pieces of hardware that are highly optimized for the purpose of forwarding packets from one interface to another You can, of course, make a Linux-based router (we discuss this in 12) using a stock PC that has two or more network cards Such configurations are fast and cheap enough for small to medium-sized networks In fact, many companies are already starting to do this, since older PCs that are too slow to run the latest web browsers and word-processing applications are still plenty fast to perform routing As with any advice, take it within the context of your requirements, budget, and skills Open source and Linux are great tools, but like anything else, make sure you re using the right tool for the job.

You can obtain all annotations that have RUNTIME retention that are associated with an item by calling getAnnotations( ) on that item It has this general form: Annotation[ ] getAnnotations( ) It returns an array of the annotations getAnnotations( ) can be called on objects of type Class, Method, Constructor, and Field Here is another reflection example that shows how to obtain all annotations associated with a class and with a method It declares two annotations It then uses those annotations to annotate a class and a method