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Here, strOb is assigned to iOb However, strOb refers to an object that contains a string, not an integer This assignment is syntactically valid because all NonGen references are the same, and any NonGen reference can refer to any other NonGen object However, the statement is semantically wrong, as the next line shows Here, the return type of getob( ) is cast to Integer, and then an attempt is made to assign this value to v The trouble is that iOb now refers to an object that stores a String, not an Integer Unfortunately, without the use of generics, the Java compiler has no way to know this Instead, a run-time exception occurs when the cast to Integer is attempted As you know, it is extremely bad to have run-time exceptions occur in your code! The preceding sequence can t occur when generics are used If this sequence were attempted in the generic version of the program, the compiler would catch it and report an error, thus preventing a serious bug that results in a run-time exception The ability to create type-safe code in which type-mismatch errors are caught at compile time is a key advantage of generics Although using Object references to create generic code has always been possible, that code was not type safe, and its misuse could result in run-time exceptions Generics prevent this from occurring In essence, through generics, what were once run-time errors have become compile-time errors This is a major advantage

You can declare more than one type parameter in a generic type To specify two or more type parameters, simply use a comma-separated list For example, the following TwoGen class is a variation of the Gen class that has two type parameters:

Figure 24-1 shows the MOTOR block. It works almost exactly like the MOVE block, with but a few exceptions. First, the MOTOR block can only be used to control a single motor; you cannot use it to control two or more motors, so you ll have to drop in two (or more) MOTOR blocks if you wish to have precise control over two or more motors.

If we look at a sample representation of a device connected to the PCI bus on our system, we ll see these elements:

// A simple generic class with two type // parameters: T and V class TwoGen<T, V> { T ob1; V ob2; // Pass the constructor a reference to // an object of type T and an object of type V TwoGen(T o1, V o2) { ob1 = o1; ob2 = o2; }

14:

[root@serverA ~]# ls -1 /sys/devices/pci0000:00/0000:00:000/ class config device driver enable irq local_cpus <OUTPUT TRUNCATED> resource resource0 vendor

// Show types of T and V void showTypes() { Systemoutprintln("Type of T is " + ob1getClass()getName()); Systemoutprintln("Type of V is " + ob2getClass()getName()); } T getob1() { return ob1; } V getob2() { return ob2; } } // Demonstrate TwoGen class SimpGen { public static void main(String args[]) { TwoGen<Integer, String> tgObj = new TwoGen<Integer, String>(88, "Generics"); // Show the types tgObjshowTypes(); // Obtain and show values int v = tgObjgetob1(); Systemoutprintln("value: " + v); String str = tgObjgetob2(); Systemoutprintln("value: " + str); } }

The output from this program is shown here: Type of T is javalangInteger Type of V is javalangString value: 88 value: Generics Notice how TwoGen is declared:

The topmost element under the devices directory in the preceding output describes the PCI domain and bus number The particular system bus here is the pci0000:00 PCI bus, where 0000 is the domain number and the bus number is 00 The functions of some of the other files are listed here: File class config detach_state device irq local_cpus resource resource0 (resource0 n) vendor Function PCI class PCI config space Connection status PCI device IRQ number Nearby CPU mask PCI resource host address PCI resource zero PCI vendor ID (a list of vendor IDs can be found in the /usr/share/hwdata/pciids file)

class TwoGen<T, V> {

It specifies two type parameters: T and V, separated by a comma Because it has two type parameters, two type arguments must be passed to TwoGen when an object is created, as shown next:

In this chapter, you learned about the proc file system and how you can use it to get a peek inside the Linux kernel, as well as to influence the kernel s operation The tools used to accomplish these tasks are relatively trivial (echo and cat), but the concept of a pseudo-file system that doesn t exist on disk can be a little difficult to grasp Looking at proc from a system administrator s point of view, you learned to find your way around the proc file system and how to get reports from various subsystems (especially the networking subsystem) You learned how to set kernel parameters to accommodate possible future enhancements Finally, brief mention was made of the allnew (and very important) SysFS virtual file system

TwoGen<Integer, String> tgObj = new TwoGen<Integer, String>(88, "Generics");