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After these statements, it is no longer necessary to qualify sqrt( ) or pow( ) with their class name Therefore, the hypotenuse calculation can more conveniently be specified, as shown here:

Because there is no /etc/profile or /etc/bashrc to change our prompt, the prompt will change to bash-300# Now try an ls:

hypot = sqrt(pow(side1, 2) + pow(side2, 2));

As you can see, this form is considerably more readable There are two general forms of the import static statement The first, which is used by the preceding example, brings into view a single name Its general form is shown here: import static pkgtype-namestatic-member-name; Here, type-name is the name of a class or interface that contains the desired static member Its full package name is specified by pkg The name of the member is specified by static-member-name The second form of static import imports all static members of a given class or interface Its general form is shown here: import static pkgtype-name*; If you will be using many static methods or fields defined by a class, then this form lets you bring them into view without having to specify each individually Therefore, the preceding program could have used this single import statement to bring both pow( ) and sqrt( ) (and all other static members of Math) into view:

Then try a pwd to view the current working directory:

import static javalangMath*;

Of course, static import is not limited just to the Math class or just to methods For example, this brings the static field Systemout into view:

bash-300# pwd /

import static javalangSystemout;

Exercise 4-2

NOTE We didn t need to explicitly copy over the pwd command used previously, because pwd is one of the many BASH built-in commands It comes with the BASH program that we already copied over Since we don t have an /etc/passwd or /etc/group file in the chrooted environment (to help map numeric user IDs to usernames), an ls -l command will show the raw user ID (UID) values for each file For example:

After this statement, you can output to the console without having to qualify out with System, as shown here:

outprintln("After importing Systemout, you can use out directly");

bash-32# cd bash-32# ls -rwxr-xr-x 1 -rwxr-xr-x 1 lib/ -l 0 0 128952 Feb 10 18:09 ld-linuxso2 0 0 26156 Feb 10 18:14 libaclso1

Whether importing Systemout as just shown is a good idea is subject to debate Although it does shorten the statement, it is no longer instantly clear to anyone reading the program that the out being referred to is Systemout One other point: in addition to importing the static members of classes and interfaces defined by the Java API, you can also use static import to import the static members of classes and interfaces that you create

Part I:

14:

As convenient as static import can be, it is important not to abuse it Remember, the reason that Java organizes its libraries into packages is to avoid namespace collisions When you import static members, you are bringing those members into the global namespace Thus, you are increasing the potential for namespace conflicts and for the inadvertent hiding of other names If you are using a static member once or twice in the program, it s best not to import it Also, some static names, such as Systemout, are so recognizable that you might not want to import them Static import is designed for those situations in which you are using a static member repeatedly, such as when performing a series of mathematical computations In essence, you should use, but not abuse, this feature

Invoking Overloaded Constructors Through this( )

With limited commands/executables in a chroot environment, the environment isn t terribly useful for practical work, which is what makes it great from a security perspective; we give only the minimum files necessary for an application to work, thus minimizing our exposure in the event the application gets compromised Keep in mind that not all chroot environments need to have a shell and an ls command installed for example, if the Berkeley Internet Name Domain (BIND) DNS server needs only its own executable, libraries, and zone files installed, then that s all you need