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As just described, listFiles( ) returns the file list as an array of File objects This is often the form that you want However, you can obtain a list that contains just the names of the files in an array of String objects This is done by using the list( ) method, which is also defined by File There are two versions of list( ) The first obtains all files Thus, it obtains an unfiltered list of files It is shown here: String[ ] list( ) To obtain a filtered file list, use this second form of list( ): String[ ] list(FilenameFilter fnf) It obtains a list of only those files that meet the criteria specified by fnf Notice that the filtered form of list( ) uses a FilenameFilter rather than a FileFilter FilenameFilter is an interface that offers an alternative way to construct a filter It specifies only one method, accept( ), shown here: boolean accept(File dir, String name) In this method, the directory is passed to dir and the filename is passed to name It must return true for files that match the filename specified by name Otherwise, it must return false You can also use FilenameFilter with listFiles( ) to obtain a filtered file list This form of listFiles( ) is shown here: File[ ] listFiles(FilenameFilter fnf)

Click and hold on any desired Tab Drag the Tab away from its home in the Quadrant and drop it anywhere on the window except in the Tab bar of another Quadrant The torn Tab is now a freestanding Window of the same display

3:

Click on the desired Tab in its current Window location, and drag it back to the Tab bar of any desired Quadrant Release the Tab, and it will relocate to that Quadrant

Classes javautilzipDeflaterOutputStream javautilzipInflaterInputStream Methods void write(int byteVal) void close( ) int read( ) void close( )

Or, as an alternative,

.

Control-Click in the Quadrant s Tab bar and select the Tab you wish to place in that Quadrant Release the mouse and the selected Tab will appear there

As mentioned near the start of this chapter, Java provides stream classes that automatically compress and decompress data These classes are packaged in javautilzip Four of the classes are used to read and write standard GZIP and ZIP files However, it is also possible to use the compression algorithms directly, without creating one of these standard files There is one very good reason why you might want to do this: it enables your application to operate directly on compressed data This may be especially valuable when using very large data files For example, a database that contains the inventory of a large online retailer might contain several thousand entries By storing that database in compressed form, its size can be significantly reduced Because Java s compressed file streams give you the ability to read and write a compressed file directly, all file operations can take place on the compressed file, without the need to create a decompressed copy This recipe shows one way to implement such a scheme As you will see, using compressed data is very easy because it involves a nearly transparent overlay to the basic file handling required by the application At the foundation of the compression library are the classes Deflater and Inflater They provide the algorithms that compress and decompress data As mentioned near the start of this chapter, the default implementation of these classes uses the ZLIB compression library Default implementations of these classes are used by the compressed data streams defined by javautilzip These default implementations are adequate for most compression tasks, and you normally will not need to interact with Deflater or Inflater directly This recipe uses DeflaterOutputStream to write to a compressed data file and InflaterInputStream to read from a compressed data file DeflaterOutputStream is derived from OutputStream and FilterOutputStream and implements the Closeable and Flushable interfaces InflaterInputStream is derived from InputStream and FilterInputStream and implements the Closeable interface.

Tabs are useful devices they can organize and display data from a variety of screens and editors within

To compress data and write it to a file involves these steps: 1 Create a file stream that uses DeflaterOutputStream 2 Write output to the DeflaterOutputStream instance You can use one of the standard write( ) methods to write the data Often, however, a DeflaterOutputStream is wrapped in a DataOutputStream, which lets you conveniently write primitive data types, such as int or double In either case, the data will automatically be compressed 3 Close the output stream when done writing

While Tabs are at home in their Quadrants and visible, these Keyboard Shortcuts can be used to bring them to the foreground (See Table 3-1) The Command-Key + number syntax is simple and consistent Executing a Command-Key combination will bring that Tab to the foreground in its Quadrant If the Quadrant containing the desired Tab is NOT currently visible, nothing will happen when the Command-Key is used