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The Methods Defined by Buffer
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27:
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NIO, Regular Expressions, and Other Packages
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From Buffer are derived the following specific buffer classes, which hold the type of data that their names imply:
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ByteBuffer IntBuffer CharBuffer LongBuffer DoubleBuffer MappedByteBuffer FloatBuffer ShortBuffer
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MappedByteBuffer is a subclass of ByteBuffer that is used to map a file to a buffer All buffers support various get( ) and put( ) methods, which allow you to get data from a buffer or put data into a buffer For example, Table 27-3 shows the get( ) and put( ) methods defined by ByteBuffer (The other buffer classes have similar methods) All buffer classes also support methods that perform various buffer operations For example, you can allocate a buffer manually using allocate( ) You can wrap an array inside a buffer using wrap( ) You can create a subsequence of a buffer using slice( )
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Method abstract byte get( ) ByteBuffer get(byte vals[ ] ) ByteBuffer get(byte vals[ ], int start, int num)
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Description Returns the byte at the current position Copies the invoking buffer into the array referred to by vals Returns a reference to the buffer Copies num elements from the invoking buffer into the array referred to by vals, beginning at the index specified by start Returns a reference to the buffer If there are not num elements remaining in the buffer, a BufferUnderflowException is thrown Returns the byte at the index specified by idx within the invoking buffer Copies b into the invoking buffer at the current position Returns a reference to the buffer Copies all elements of vals into the invoking buffer, beginning at the current position Returns a reference to the buffer Copies num elements from vals, beginning at start, into the invoking buffer Returns a reference to the buffer If the buffer cannot hold all of the elements, a BufferOverflowException is thrown Copies the elements in bb to the invoking buffer, beginning at the current position If the buffer cannot hold all of the elements, a BufferOverflowException is thrown Returns a reference to the buffer
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abstract byte get(int idx) abstract ByteBuffer put(byte b) final ByteBuffer put(byte vals[ ] )
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ByteBuffer put(byte vals[ ], int start, int num)
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ByteBuffer put(ByteBuffer bb)
abstract ByteBuffer put(int idx, byte b) Copies b into the invoking buffer at the location specified by idx Returns a reference to the buffer TABLE 27-3
The get( ) and put( ) Methods Defined for ByteBuffer
Part II:
The Java Library
Channels
Channels are defined in javaniochannels A channel represents an open connection to an I/O source or destination You obtain a channel by calling getChannel( ) on an object that supports channels For example, getChannel( ) is supported by following I/O classes
DatagramSocket RandomAccessFile FileInputStream ServerSocket FileOutputStream Socket
Thus, to obtain a channel, you first obtain an object of one of these classes and then call getChannel( ) on that object The specific type of channel returned depends upon the type of object getChannel( ) is called on For example, when called on a FileInputStream, FileOutputStream, or RandomAccessFile, getChannel( ) returns a channel of type FileChannel When called on a Socket, getChannel( ) returns a SocketChannel Channels such as FileChannel and SocketChannel support various read( ) and write( ) methods that enable you to perform I/O operations through the channel For example, here are a few of the read( ) and write( ) methods defined for FileChannel All can throw an IOException
Method abstract int read(ByteBuffer bb) Description Reads bytes from the invoking channel into bb until the buffer is full or there is no more input Returns the number of bytes actually read Beginning at the file location specified by start, reads bytes from the invoking channel into bb until the buffer is full or there is no more input The current position is unchanged Returns the number of bytes actually read or 1 if start is beyond the end of the file Writes the contents of bb to the invoking channel, starting at the current position Returns the number of bytes written Beginning at the file location specified by start, writes the contents of bb to the invoking channel The current position is unchanged Returns the number of bytes written
abstract int read(ByteBuffer bb, long start)
abstract int write(ByteBuffer bb) abstract int write(ByteBuffer bb, long start)
All channels support additional methods that give you access to and control over the channel For example, FileChannel supports methods to get or set the current position, transfer information between file channels, obtain the current size of the channel, and lock the channel, among others FileChannel also provides the map( ) method, which lets you map a file to a buffer
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