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If you initialize a Random object with a seed, you define the starting point for the random sequence If you use the same seed to initialize another Random object, you will extract the same random sequence If you want to generate different sequences, specify different seed values The easiest way to do this is to use the current time to seed a Random object This approach reduces the possibility of getting repeated sequences The public methods defined by Random are shown in Table 18-6 As you can see, there are seven types of random numbers that you can extract from a Random object Random Boolean values are available from nextBoolean( ) Random bytes can be obtained by calling nextBytes( ) Integers can be extracted via the nextInt( ) method Long integers, uniformly distributed over their range, can be obtained with nextLong( ) The nextFloat( ) and nextDouble( ) methods return a uniformly distributed float and double, respectively, between 00 and 10 Finally, nextGaussian( ) returns a double value centered at 00 with a standard deviation of 10 This is what is known as a bell curve Here is an example that demonstrates the sequence produced by nextGaussian( ) It obtains 100 random Gaussian values and averages these values The program also counts the number of values that fall within two standard deviations, plus or minus, using increments of 05 for each category The result is graphically displayed sideways on the screen

// Demonstrate random Gaussian values import javautilRandom; class RandDemo { public static void main(String args[]) { Random r = new Random(); double val; double sum = 0; int bell[] = new int[10]; for(int i=0; i<100; i++) { val = rnextGaussian(); sum += val; double t = -2;

When configuring NFS, it is helpful to use the showmount command to see if everything is working correctly The command is used for showing mount information for an NFS server By using the showmount command, you can quickly determine if you have configured nfsd correctly After you have configured your /etc/exports file and exported all of your file systems using exportfs, you can run showmount -e to see a listing of exported file systems on the local NFS server The -e option tells showmount to show the NFS server s export list For example,

Part II:

for(int x=0; x<10; x++, t += 05) if(val < t) { bell[x]++; break; } } Systemoutprintln("Average of values: " + (sum/100)); // display bell curve, sideways for(int i=0; i<10; i++) { for(int x=bell[i]; x>0; x--) Systemoutprint("*"); Systemoutprintln(); } } }

[root@serverA ~]# showmount -e localhost Export list for localhost: /home *

Here is a sample program run As you can see, a bell-like distribution of numbers is obtained Average of values: 00702235271133344 ** ******* ****** *************** ****************** ***************** ************* ********** ******** ***

The Observable class is used to create subclasses that other parts of your program can observe When an object of such a subclass undergoes a change, observing classes are notified Observing classes must implement the Observer interface, which defines the update( ) method The update( ) method is called when an observer is notified of a change in an observed object Observable defines the methods shown in Table 18-7 An object that is being observed must follow two simple rules First, if it has changed, it must call setChanged( ) Second, when it is ready to notify observers of this change, it must call notifyObservers( ) This causes the update( ) method in the observing object(s) to be called Be careful if the object calls notifyObservers( ) without having previously called setChanged( ), no action will take place The observed object must call both setChanged( ) and notifyObservers( ) before update( ) will be called Notice that notifyObservers( ) has two forms: one that takes an argument and one that does not If you call notifyObservers( ) with an argument, this object is passed to the observer s update( ) method as its second parameter Otherwise, null is passed to update( ) You can use the second parameter for passing any type of object that is appropriate for your application

If you simply run the showmount command with no options, it will list clients connected to the server For example,

CHAPTER 7 WIRED!

18:

Method void addObserver(Observer obj) protected void clearChanged( ) int countObservers( )

[root@serverA ~]# showmount localhost Hosts on localhost: * 1921681100

Description Adds obj to the list of objects observing the invoking object Calling this method returns the status of the invoking object to unchanged Returns the number of objects observing the invoking object

void deleteObserver(Observer obj) Removes obj from the list of objects observing the invoking object void deleteObservers( ) boolean hasChanged( ) void notifyObservers( ) Removes all observers for the invoking object Returns true if the invoking object has been modified and false if it has not Notifies all observers of the invoking object that it has changed by calling update( ) A null is passed as the second argument to update( ) Notifies all observers of the invoking object that it has changed by calling update( ) obj is passed as an argument to update( ) Called when the invoking object has changed