create 2d barcode vb.net Input/Output: Exploring javaio in Java

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Input/Output: Exploring javaio
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case ' ': if (marked) { marked = false; freset(); Systemoutprint("&"); } else Systemoutprint((char) c); break; default: if (!marked) Systemoutprint((char) c); break; } } } }
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Notice that this example uses mark(32), which preserves the mark for the next 32 bytes read (which is enough for all entity references) Here is the output produced by this program: This is a (c) copyright symbol but this is © not
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BufferedOutputStream
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A BufferedOutputStream is similar to any OutputStream with the exception of an added flush( ) method that is used to ensure that data buffers are physically written to the actual output device Since the point of a BufferedOutputStream is to improve performance by reducing the number of times the system actually writes data, you may need to call flush( ) to cause any data that is in the buffer to be immediately written Unlike buffered input, buffering output does not provide additional functionality Buffers for output in Java are there to increase performance Here are the two available constructors: BufferedOutputStream(OutputStream outputStream) BufferedOutputStream(OutputStream outputStream, int bufSize) The first form creates a buffered stream using the default buffer size In the second form, the size of the buffer is passed in bufSize
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PushbackInputStream
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One of the novel uses of buffering is the implementation of pushback Pushback is used on an input stream to allow a byte to be read and then returned (that is, pushed back ) to the stream The PushbackInputStream class implements this idea It provides a mechanism to peek at what is coming from an input stream without disrupting it PushbackInputStream has the following constructors: PushbackInputStream(InputStream inputStream) PushbackInputStream(InputStream inputStream, int numBytes) The first form creates a stream object that allows one byte to be returned to the input stream The second form creates a stream that has a pushback buffer that is numBytes long This allows multiple bytes to be returned to the input stream
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Part II:
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Beyond the familiar methods of InputStream, PushbackInputStream provides unread( ), shown here: void unread(int ch) void unread(byte buffer[ ]) void unread(byte buffer, int offset, int numChars) The first form pushes back the low-order byte of ch This will be the next byte returned by a subsequent call to read( ) The second form returns the bytes in buffer The third form pushes back numChars bytes beginning at offset from buffer An IOException will be thrown if there is an attempt to return a byte when the pushback buffer is full Here is an example that shows how a programming language parser might use a PushbackInputStream and unread( ) to deal with the difference between the = = operator for comparison and the = operator for assignment:
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// Demonstrate unread() import javaio*; class PushbackInputStreamDemo { public static void main(String args[]) throws IOException { String s = "if (a == 4) a = 0;\n"; byte buf[] = sgetBytes(); ByteArrayInputStream in = new ByteArrayInputStream(buf); PushbackInputStream f = new PushbackInputStream(in); int c; while ((c = fread()) != -1) { switch(c) { case '=': if ((c = fread()) == '=') Systemoutprint("eq"); else { Systemoutprint("<-"); funread(c); } break; default: Systemoutprint((char) c); break; } } } }
Here is the output for this example Notice that = = was replaced by eq and = was replaced by < if (a eq 4) a <- 0;
CAUTION PushbackInputStream has the side effect of invalidating the mark( ) or reset( )
methods of the InputStream used to create it Use markSupported( ) to check any stream on which you are going to use mark( )/reset( )
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Input/Output: Exploring javaio
SequenceInputStream
The SequenceInputStream class allows you to concatenate multiple InputStreams The construction of a SequenceInputStream is different from any other InputStream A SequenceInputStream constructor uses either a pair of InputStreams or an Enumeration of InputStreams as its argument: SequenceInputStream(InputStream first, InputStream second) SequenceInputStream(Enumeration < extends InputStream> streamEnum) Operationally, the class fulfills read requests from the first InputStream until it runs out and then switches over to the second one In the case of an Enumeration, it will continue through all of the InputStreams until the end of the last one is reached Here is a simple example that uses a SequenceInputStream to output the contents of two files:
// Demonstrate sequenced input import javaio*; import javautil*; class InputStreamEnumerator implements Enumeration<FileInputStream> { private Enumeration<String> files; public InputStreamEnumerator(Vector<String> files) { thisfiles = fileselements(); } public boolean hasMoreElements() { return fileshasMoreElements(); } public FileInputStream nextElement() { try { return new FileInputStream(filesnextElement()toString()); } catch (IOException e) { return null; } } } class SequenceInputStreamDemo { public static void main(String args[]) throws IOException { int c; Vector<String> files = new Vector<String>(); filesaddElement("/autoexecbat"); filesaddElement("/configsys"); InputStreamEnumerator e = new InputStreamEnumerator(files); InputStream input = new SequenceInputStream(e); while ((c = inputread()) != -1) { Systemoutprint((char) c);
Part II:
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