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CharArrayReader is an implementation of an input stream that uses a character array as the source This class has two constructors, each of which requires a character array to provide the data source: CharArrayReader(char array[ ]) CharArrayReader(char array[ ], int start, int numChars) Here, array is the input source The second constructor creates a Reader from a subset of your character array that begins with the character at the index specified by start and is numChars long The following example uses a pair of CharArrayReaders:
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// Demonstrate CharArrayReader import javaio*; public class CharArrayReaderDemo { public static void main(String args[]) throws IOException { String tmp = "abcdefghijklmnopqrstuvwxyz"; int length = tmplength(); char c[] = new char[length]; tmpgetChars(0, length, c, 0); CharArrayReader input1 = new CharArrayReader(c); CharArrayReader input2 = new CharArrayReader(c, 0, 5); int i; Systemoutprintln("input1 is:"); while((i = input1read()) != -1) { Systemoutprint((char)i); } Systemoutprintln(); Systemoutprintln("input2 is:"); while((i = input2read()) != -1) { Systemoutprint((char)i); } Systemoutprintln();
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The input1 object is constructed using the entire lowercase alphabet, while input2 contains only the first five letters Here is the output: input1 is: abcdefghijklmnopqrstuvwxyz input2 is: abcde
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CharArrayWriter
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CharArrayWriter is an implementation of an output stream that uses an array as the destination CharArrayWriter has two constructors, shown here: CharArrayWriter( ) CharArrayWriter(int numChars) In the first form, a buffer with a default size is created In the second, a buffer is created with a size equal to that specified by numChars The buffer is held in the buf field of CharArrayWriter The buffer size will be increased automatically, if needed The number of characters held by the buffer is contained in the count field of CharArrayWriter Both buf and count are protected fields The following example demonstrates CharArrayWriter by reworking the sample program shown earlier for ByteArrayOutputStream It produces the same output as the previous version // Demonstrate CharArrayWriter import javaio*; class CharArrayWriterDemo { public static void main(String args[]) throws IOException { CharArrayWriter f = new CharArrayWriter();
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String s = "This should end up in the array"; char buf[] = new char[slength()]; sgetChars(0, slength(), buf, 0); fwrite(buf); Systemoutprintln("Buffer as a string"); Systemoutprintln(ftoString()); Systemoutprintln("Into array"); char c[] = ftoCharArray(); for (int i=0; i<clength; i++) { Systemoutprint(c[i]); } Systemoutprintln("\\nTo a FileWriter()"); FileWriter f2 = new FileWriter("testtxt"); fwriteTo(f2); f2close(); Systemoutprintln("Doing a reset"); freset(); for (int i=0; i<3; i++) fwrite('X'); Systemoutprintln(ftoString());
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BufferedReader improves performance by buffering input It has two constructors: BufferedReader(Reader inputStream) BufferedReader(Reader inputStream, int bufSize) The first form creates a buffered character stream using a default buffer size In the second, the size of the buffer is passed in bufSize As is the case with the byte-oriented stream, buffering an input character stream also provides the foundation required to support moving backward in the stream within the available buffer To support this, BufferedReader implements the mark( ) and reset( ) methods, and BufferedReadermarkSupported( ) returns true The following example reworks the BufferedInputStream example, shown earlier, so that it uses a BufferedReader character stream rather than a buffered byte stream As before, it uses mark( ) and reset( ) methods to parse a stream for the HTML entity reference for the copyright symbol Such a reference begins with an ampersand (&) and ends with a semicolon (;) without any intervening whitespace The sample input has two ampersands, to show the case where the reset( ) happens and where it does not Output is the same as that shown earlier // Use buffered input import javaio*; class BufferedReaderDemo { public static void main(String args[]) throws IOException { String s = "This is a © copyright symbol " + "but this is © not\\n"; char buf[] = new char[slength()]; sgetChars(0, slength(), buf, 0); CharArrayReader in = new CharArrayReader(buf); BufferedReader f = new BufferedReader(in); int c;
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boolean marked = false; while ((c = fread()) != -1) { switch(c) { case '&': if (!marked) { fmark(32); marked = true; } else { marked = false; } break; case ';': if (marked) { marked = false; Systemoutprint("(c)"); } else Systemoutprint((char) c); break; case ' ': if (marked) { marked = false; freset(); Systemoutprint("&"); } else Systemoutprint((char) c); break; default: if (!marked) Systemoutprint((char) c); break; } }
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