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Enumerations, Autoboxing, and Annotations (Metadata)

In addition to the convenience that it offers, autoboxing/unboxing can also help prevent errors For example, consider the following program:

If the ISC DHCP software is not available in a prepackaged form for your particular Linux distribution, you can always build the software from source code available from the ISC site at wwwiscorg It is also possible that you simply want to take advantage of the most recent bug fixes available for the software, which your distribution has not yet implemented As of this writing, the most current stable version of the software was version 410a1, which can be downloaded directly from http://ftpiscorg/isc/dhcp/ dhcp-410a1targz Once the package is downloaded, unpack the software as shown For this example, we assume the source was downloaded into the /usr/local/src/ directory Unpack the tarball thus:

// An error produced by manual unboxing class UnboxingError { public static void main(String args[]) { Integer iOb = 1000; // autobox the value 1000 int i = iObbyteValue(); // manually unbox as byte !!! Systemoutprintln(i); } } // does not display 1000 !

This program displays not the expected value of 1000, but 24! The reason is that the value inside iOb is manually unboxed by calling byteValue( ), which causes the truncation of the value stored in iOb, which is 1,000 This results in the garbage value of 24 being assigned to i Auto-unboxing prevents this type of error because the value in iOb will always autounbox into a value compatible with int In general, because autoboxing always creates the proper object, and auto-unboxing always produces the proper value, there is no way for the process to produce the wrong type of object or value In the rare instances where you want a type different than that produced by the automated process, you can still manually box and unbox values Of course, the benefits of autoboxing/unboxing are lost In general, new code should employ autoboxing/unboxing It is the way that modern Java code will be written

Change to the dhcp* subdirectory created by this command Then take a minute to study any Readme file(s) that might be present Next configure the package with the configure command

Now that Java includes autoboxing and auto-unboxing, some might be tempted to use objects such as Integer or Double exclusively, abandoning primitives altogether For example, with autoboxing/unboxing it is possible to write code like this:

Note You may not see all the options displayed in Figure 10-4 listed in the drop-down menu on your screen.

[root@serverA dhcp-410a1]# /configure --prefix=/usr/local/

// A bad use of autoboxing/unboxing! Double a, b, c; a = 100; b = 40; c = Mathsqrt(a*a + b*b); Systemoutprintln("Hypotenuse is " + c);

In this example, objects of type Double hold values that are used to calculate the hypotenuse of a right triangle Although this code is technically correct and does, in fact, work properly, it is a very bad use of autoboxing/unboxing It is far less efficient than the equivalent code written using the primitive type double The reason is that each autobox and auto-unbox adds overhead that is not present if the primitive type is used

This version of ISC DHCP software that we built from source installs the DHCP server (dhpcd) daemon under the /usr/local/sbin/ directory and the DHCP client (dhcpclient) under the /usr/local/sbin/ directory

Part I:

23:

Once this command completes successfully, you should have the necessary dhcp server software installed

I n t r o d u c i n g t h e A W T: Wo r k i n g w i t h W i n d o w s , G r a p h i c s , a n d Te x t

Class Graphics GraphicsDevice GraphicsEnvironment GridBagConstraints GridBagLayout GridLayout Image Insets Label List MediaTracker Menu MenuBar MenuComponent MenuItem MenuShortcut Panel Point Polygon PopupMenu PrintJob Rectangle Robot Scrollbar ScrollPane SystemColor TextArea TextComponent TextField Toolkit Window TABLE 23-1

The default primary configuration file of the ISC DHCP server is /etc/dhcpdconf (in the Ubuntu distro, the file is located at /etc/dhcp3/dhcpdconf) The configuration file encapsulates two ideas: