CharArrayReader

CharArrayReader is 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[ ]): array is the input source.
CharArrayReader(char array[ ], int start, int numChars): creates a Reader from a subset of the character array

void close(): Closes the stream and releases any system resources associated with it.
void mark(int readAheadLimit): Marks the present position in the stream.
boolean markSupported(): Tells whether this stream supports the mark() operation, which it does.
int read(): Reads a single character.
int read(char[] b, int off, int len): Reads characters into a portion of an array.
boolean ready(): Tells whether this stream is ready to be read.
void reset(): Resets the stream to the most recent mark, or to the beginning if it has never been marked.
long skip(long n): Skips characters.

Revised from Open JDK source code

 
import java.io.CharArrayReader;
import java.io.CharArrayWriter;
import java.io.IOException;

public class Main {
  public static void main(String args[]) throws IOException {
    CharArrayWriter outStream = new CharArrayWriter();
    String s = "This is a test.";
    for (int i = 0; i < s.length(); ++i)
      outStream.write(s.charAt(i));
    System.out.println("outstream: " + outStream);
    System.out.println("size: " + outStream.size());
    CharArrayReader inStream;
    inStream = new CharArrayReader(outStream.toCharArray());
    int ch = 0;
    StringBuffer sb = new StringBuffer("");
    while ((ch = inStream.read()) != -1)
      sb.append((char) ch);
    s = sb.toString();
    System.out.println(s.length() + " characters were read");
    System.out.println("They are: " + s);
  }
}


import java.io.CharArrayReader;
import java.io.IOException;

public class Main {
  public static void main(String args[]) throws IOException {
    CharArrayReader inStream;
    inStream = new CharArrayReader(new char[] { 'j', 'a', 'v', 'a', '2', 's', '.', 'c', 'o', 'm' });
    int ch = 0;
    StringBuffer sb = new StringBuffer("");
    while ((ch = inStream.read()) != -1)
      sb.append((char) ch);
    String s = sb.toString();
    System.out.println(s.length() + " characters were read");
    System.out.println("They are: " + s);

  }
}

The output:


10 characters were read
They are: java2s.com

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CharArrayReader:

CharArrayReader
new CharArrayReader(char[] buf, int offset, int length)