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ne of Linux s greatest strengths is that its source code is available to anyone who wants it The GNU GPL (General Public License) under which Linux is distributed even allows you to tinker with the source code and distribute your changes! Real changes to the source code (at least, those to be taken seriously) go through the process of joining the official kernel tree This requires extensive testing and proof that the changes will benefit Linux as a whole At the end of the approval process, the code gets a final yes or no from a core group of the Linux project s original developers It is this extensive review process that keeps the quality of Linux s code so noteworthy For system administrators who have used other proprietary operating systems, this approach to code control is a significant departure from the philosophy of waiting for the company to release a patch, a service pack, or some sort of hotfix Instead of having to wade through public relations, sales engineers, and other front-end units, you have the option of contacting the author of the subsystem directly and explaining your problem A patch can be created and sent to you before the next official release of the kernel, and get you up and running Of course, the flip side of this working arrangement is that you need to be able to compile a kernel yourself rather than rely on someone else to supply precompiled code However, you won t have to do this often, because production environments, once stable, rarely need a kernel compile But if need be, you should know what to do Luckily, it s not difficult In this chapter, we ll walk through the process of acquiring a kernel source tree, configuring it, compiling it, and finally, installing the end result CAUTION The kernel is the first thing that loads when a Linux system is booted (after the boot loader, of course!) If the kernel doesn t work right, it s unlikely that the rest of the system will boot Be sure to have an emergency or rescue boot medium handy in case you need to revert to an old configuration (See the section on GRUB in 6).

Although b1 and b2 both refer to the same object, they are not linked in any other way For example, a subsequent assignment to b1 will simply unhook b1 from the original object without affecting the object or affecting b2 For example:

Box b1 = new Box(); Box b2 = b1; // b1 = null;

Before we jump into the process of compiling, let s back up a step and make sure you re clear on the concept of what a kernel is and the role it plays in the system Most often, when people say Linux, they are usually referring to a Linux distribution for example, OpenSuSE Linux is a type of Linux distribution As discussed in 1, a distribution comprises everything necessary to get Linux to exist as a functional operating system Distributions make use of code from various open source projects that are independent of Linux; in fact, many of the software packages maintained by these projects are used extensively on other UNIX-like platforms as well The GNU C Compiler, for example, which comes with most Linux distributions, also exists on many other operating systems (probably more systems than most people realize)

REMEMBER When you assign one object reference variable to another object reference variable,

As mentioned at the beginning of this chapter, classes usually consist of two things: instance variables and methods The topic of methods is a large one because Java gives them so much power and flexibility In fact, much of the next chapter is devoted to methods However, there are some fundamentals that you need to learn now so that you can begin to add methods to your classes

9:

Part I:

Now run the program. Try it a few times press the Left button immediately after the count-up ends, or don t press it. Your decision to press or not press the button will be converted to a True or False value that is written to the Pressed variable. After the countdown, the Pressed variable is read by the SWITCH block, and the proper text is written on the LCD screen. Variables are a powerful way for your robot to store away information and to use that data later. Once the variable has been created and data written to it, that data will be available anytime you need it well, at least until the program ends. If you want to store data for use after the program ends and/or after the power has been turned off, you ll need a different type of block. And that s where the CONSTANT block becomes useful.