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I ll do the same thing for the second and third tabs When the RANDOM block generates a number from 1 to 3, that number is passed to the SWITCH block The SWITCH block takes this Number value and compares it to the values in its Condition section If the RANDOM block sends a 3, the SWITCH blocks takes that value, notices that it equals the 3 in the third condition, and then executes any blocks found on the third tab Easy! One final warning, though what happens if the RANDOM block goes crazy and sends a value of 4 or 5 to the SWITCH block There is no condition that has a matching value of 4 or 5, so what will happen Well, remember when you selected a condition and clicked the * button and a checkmark appeared next to the condition That checkmark also specifies the default condition.

A relatively new addition to Java is called NIO (New I/O), and it is one of the more interesting packages because it supports a channel-based approach to I/O operations The NIO classes are contained in the five packages shown here:

The vertical bar ( | ) character represents the pipe between printenv and grep The command shell under Windows also utilizes the pipe function The primary difference is that all commands in a Linux pipe are executed concurrently, whereas Windows runs each program in order, using temporary files to hold intermediate results

Package javanio javaniochannels javaniochannelsspi javaniocharset javaniocharsetspi Purpose Top-level package for the NIO system Encapsulates various types of buffers that contain data operated upon by the NIO system Supports channels, which are essentially open I/O connections Supports service providers for channels Encapsulates character sets Also supports encoders and decoders that convert characters to bytes and bytes to characters, respectively Supports service providers for character sets

Before we begin, it is important to emphasize that the NIO subsystem is not intended to replace the I/O classes found in javaio, which are discussed in 19 Instead, the NIO classes supplement the standard I/O system, giving you an alternative approach, which can be beneficial in some circumstances

Through redirection, you can take the output of a program and have it automatically sent to a file (Remember that everything in Linux/UNIX is regarded as a file!) The shell rather than the program itself handles this process, thereby providing a standard mechanism for performing the task (Using redirection is much easier than having to remember how to do this for every single program!) Redirection comes in three classes: output to a file, append to a file, and send a file as input To collect the output of a program into a file, end the command line with the greaterthan symbol (>) and the name of the file to which you want the output redirected If you are redirecting to an existing file and you want to append additional data to it, use two > symbols (>>) followed by the filename For example, here is the command to collect the output of a directory listing into a file called /tmp/directory_listing:

The NIO system is built on two foundational items: buffers and channels A buffer holds data A channel represents an open connection to an I/O device, such as a file or a socket In general, to use the NIO system, you obtain a channel to an I/O device and a buffer to hold data You then operate on the buffer, inputting or outputting data as needed The following sections examine buffers and channels in more detail

Part II:

Continuing this example with the directory listing, you could append the string Directory Listing to the end of the /tmp/directory_listing file by typing this command:

Buffers are defined in the javanio package All buffers are subclasses of the Buffer class, which defines the core functionality common to all buffers: current position, limit, and capacity The current position is the index within the buffer at which the next read or write operation will take place The current position is advanced by most read or write operations The limit is the index of the end of the buffer The capacity is the number of elements that the buffer can hold Buffer also supports mark and reset Buffer defines several methods, which are shown in Table 27-2