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of the situation Consider a stack (which is a last-in, first-out list) You might have a program that requires three types of stacks One stack is used for integer values, one for floating-point values, and one for characters The algorithm that implements each stack is the same, even though the data being stored differs In a non object-oriented language, you would be required to create three different sets of stack routines, with each set using different names However, because of polymorphism, in Java you can specify a general set of stack routines that all share the same names More generally, the concept of polymorphism is often expressed by the phrase one interface, multiple methods This means that it is possible to design a generic interface to a group of related activities This helps reduce complexity by allowing the same interface to be used to specify a general class of action It is the compiler s job to select the specific action (that is, method) as it applies to each situation You, the programmer, do not need to make this selection manually You need only remember and utilize the general interface Extending the dog analogy, a dog s sense of smell is polymorphic If the dog smells a cat, it will bark and run after it If the dog smells its food, it will salivate and run to its bowl The same sense of smell is at work in both situations The difference is what is being smelled, that is, the type of data being operated upon by the dog s nose! This same general concept can be implemented in Java as it applies to methods within a Java program

1 To start the installation process, boot off the DVD-ROM (the system Basic Input Output System, or BIOS, should be preconfigured for this already) This will present you with a welcome splash screen

public Caller(Callme targ, String s) { target = targ; msg = s; t = new Thread(this); tstart(); } public void run() { targetcall(msg); } } class Synch { public static void main(String args[]) { Callme target = new Callme(); Caller ob1 = new Caller(target, "Hello"); Caller ob2 = new Caller(target, "Synchronized"); Caller ob3 = new Caller(target, "World"); // wait for threads to end try { ob1tjoin(); ob2tjoin(); ob3tjoin(); } catch(InterruptedException e) { Systemoutprintln("Interrupted"); } } }

I know I told you that computer terminology makes my head spin, but there are some terms that cannot be avoided. The terms I want to introduce to you are easy to explain and even easier to spell, so they can t be all that bad! When talking about the Mindstorms NXT robotics kit, I m talking about a piece of technology. Technology almost always requires a little learning, but that shouldn t mean it has to be boring NXT

2 If you do not press any key, the prompt will eventually time out and begin the installation process by booting the highlighted Install or Upgrade an Existing System option You can also press enter to start the process immediately 3 At the Disc Found screen, press enter to test/verify your install media Note that the test performed here is not always perfect But for the majority of times when it does work, it can save you the trouble of starting the installation only to find out halfway through that the installer will abort because of a bad disc Press enter again at the Media Check screen to begin testing 4 After the media check runs to completion, you should get the Success screen that reports that the media was successfully verified At this point, it is safe to select OK to continue with the installation If you don t have any other install media to test, select Continue at the next screen 5 Click Next at the next screen 6 Select the language you want to use to perform the installation in this screen (see illustration) The interface works much like any other Windows-style interface Simply point to your selection and click English (English) is selected on our sample system When you are ready, click the Next button in the lower-right portion of the screen

Here is the output produced by this program: Hello[Synchronized[World] ] ] As you can see, by calling sleep( ), the call( ) method allows execution to switch to another thread This results in the mixed-up output of the three message strings In this program, nothing exists to stop all three threads from calling the same method, on the same object, at the same time This is known as a race condition, because the three threads are racing each other to complete the method This example used sleep( ) to make the effects repeatable and obvious In most situations, a race condition is more subtle and less predictable, because you can t be sure when the context switch will occur This can cause a program to run right one time and wrong the next To fix the preceding program, you must serialize access to call( ) That is, you must restrict its access to only one thread at a time To do this, you simply need to precede call( ) s definition with the keyword synchronized, as shown here:

class Callme { synchronized void call(String msg) {