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While the basic low-level streams provide a simple mechanism to read and write bytes of information, their flexibility is limited After all, reading bytes is complex (for people, at least), and there's more to the world that just bytes of data Text, for example, is a sequence of characters, and other forms of data like numbers take up more than a single byte Byte-level communication can also be inefficient, and data buffering can improve performance To overcome these limitations, filter streams are used Filter streams add additional functionality to an existing stream, by processing data in some form (such as buffering for performance) or offering additional methods that allow data to be accessed in a different manner (for example, reading a line of text rather than a sequence of bytes) Filters make life easier for programmers, as they can work with familiar constructs such as strings, lines of text, and numbers, rather than individual bytes Instead of the programmer writing a string one character at a time and converting each character to an int value for the OutputStreamwrite(int) method, the filter stream does this for them
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431 Connecting a Filter Stream to an Existing Stream
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Filter streams can be connected to any other stream, to a low-level stream or even another filter stream Filter streams are extended from the javaio FilterInputStream and javaioFilterOutputStream classes Each filter stream supports one or more constructors that accept either an InputStream, in the case of an input filter, or an OutputStream, in the case of an output filter Connecting a filter stream is as simple as creating a new instance of a filter, passing an instance of an existing stream, and using the filter from then on to read or write For example, suppose you wanted to connect a PrintStream (used to print text to an OutputStream subclass) to a stream that wrote to a file The following code may be used to
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FileOutputStream fout = new FileOutputStream ( somefile ); PrintStream pout = new PrintStream (fout); poutprintln ("hello world");
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connect the filter stream and write a message using the new filter
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This process is fairly simple as long as the programmer remembers two things: 1 Read and write operations must take place on the new filter stream 2 Read and write operations on the underlying stream can still take place, but not at the same time as an operation on the filter stream
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There are many useful filter streams, some of which are present in all versions of Java; others (such as streams for data compression) are available only in JDK11 or Java 2 The most common, and most useful, are shown in Table 4-3 These streams are discussed in detail below 4321 BufferedInputStream Class
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The purpose of I/O buffering is to improve system performance Rather than reading a byte at a time, a large number of bytes are read together the first time the read() method is invoked When an attempt is made to read subsequent bytes, they are taken from the buffer, not the underlying input stream This improves data access time and can reduce the number of times an application blocks for input Table 4-3 Filter Input Streams of the javaio Package Filter Input Stream Purpose of Stream BufferedInputStream Buffers access to data, to improve efficiency DataInputStream Reads primitive data types, such as an int, a float, a double, or even a line of text, from an input stream LineNumberInputStream Maintains a count of which line is being read, based on interpretation of end-of-line characters Handles both Unix and Windows end-of-line sequences PushBackInputStream Allows a byte of data to be pushed into the head of the stream Constructors
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BufferedInputStream (InputStream input) creates a buffered stream that will read from the specified InputStream object BufferedInputStream (InputStream input, int bufferSize) throws javalangIllegalArgumentException creates a buffered stream, of the specified size, which reads from the InputStream object passed as a parameter This
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allows developers to specify a size, which can improve efficiency if large amounts of data are going to be read The buffer size specified must be greater than or equal to one
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Methods No additional methods are provided by the BufferedInputStream class However, it does override the markSupported() method, indicating that it supports the mark(int) and reset() methods 4322 DataInputStream Class A frequent task in any programming language is reading and writing primitive data types such as numbers and characters These information types are not easily represented as bytes (for example, some data types take up more than one byte of information) Developers should not be concerned, how-ever, with the way in which representation occurs Instead, the data types can be read simply by invoking methods of the DataInputStream class, which handles the translation automatically This class implements the javaio DataInput interface NOTE Readers should be aware that only conversion from byte(s) to a data type is performed Reading a character by invoking the readChar() method won't convert a byte value into a number It is a common mistake to think that a byte value, for example 0009, will be converted into the numerical character 9
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