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The mount command was originally discussed in 7 The important parameters to use with the mount command are the specification of the NFS server name, the local mount point, and the options specified after the -o on the mount command line The following is an example of a mount command line:

Within a block, variables can be declared at any point, but are valid only after they are declared Thus, if you define a variable at the start of a method, it is available to all of the code within that method Conversely, if you declare a variable at the end of a block, it is effectively useless, because no code will have access to it For example, this fragment is invalid because count cannot be used prior to its declaration:

// This fragment is wrong! count = 100; // oops! cannot use count before it is declared! int count;

Here, serverA is the NFS server name The -o options are explained in Table 22-2 These mount options can also be used in the /etc/fstab file This same entry in the /etc/fstab file would look like this:

Here is another important point to remember: variables are created when their scope is entered, and destroyed when their scope is left This means that a variable will not hold its value once it has gone out of scope Therefore, variables declared within a method will not hold their values between calls to that method Also, a variable declared within a block will lose its value when the block is left Thus, the lifetime of a variable is confined to its scope If a variable declaration includes an initializer, then that variable will be reinitialized each time the block in which it is declared is entered For example, consider the next program

// Demonstrate lifetime of a variable class LifeTime { public static void main(String args[]) { int x; for(x = 0; x < 3; x++) { int y = -1; // y is initialized each time block is entered Systemoutprintln("y is: " + y); // this always prints -1 y = 100; Systemoutprintln("y is now: " + y); } } }

Now, let s return to our COLOR block and CUP block examples and work with the input and output data ports a bit. Just like the COLOR block, the CUP block is very picky about what types of devices are connected to it. For the Color input plug, I can only connect something that supplies a color. We already know that a color keyboard will work. I could connect a color keyboard and change the color of the cup from Blue to Green. But there s a better way! Remember that COLOR block we played around with earlier Well, it has a data hub, too; it was just hidden inside the block. If I click on the lower left edge of the COLOR block, the COLOR block s hub will pop down; this is shown in Figure 7-7.

Again, serverA is the NFS server name, and the mount options are rw, bg and soft, explained in Table 22-2

The output generated by this program is shown here: y y y y y y is: -1 is now: 100 is: -1 is now: 100 is: -1 is now: 100

As you can see, y is reinitialized to 1 each time the inner for loop is entered Even though it is subsequently assigned the value 100, this value is lost One last point: Although blocks can be nested, you cannot declare a variable to have the same name as one in an outer scope For example, the following program is illegal: