Examples of java.io.BufferedReader.mark()

java.io.BufferedReader.mark()
Set a Mark position in this BufferedReader. The parameter readLimit indicates how many characters can be read before a mark is invalidated. Sending reset() will reposition the reader back to the marked position provided readLimit has not been surpassed. @param readlimit an int representing how many characters must be read before invalidating the mark. @throws IOException If an error occurs attempting mark this BufferedReader. @throws IllegalArgumentException If readlimit is < 0

    in.reset();
    assertTrue("Wrong chars 2", in.read() == (char) 6
        && in.read() == (char) 7);
    
        BufferedReader br = new BufferedReader(new StringReader("01234"), 2);
        br.mark(3);
        char[] carray = new char[3];
        int result = br.read(carray);
        assertEquals(3, result);
        assertEquals("Assert 0:", '0', carray[0]);
        assertEquals("Assert 1:", '1', carray[1]);

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        assertEquals("Assert 1:", '1', carray[1]);
        assertEquals("Assert 2:", '2', carray[2]);
        assertEquals("Assert 3:", '3', br.read());


        br = new BufferedReader(new StringReader("01234"), 2);
        br.mark(3);
        carray = new char[4];
        result = br.read(carray);
        assertEquals("Assert 4:", 4, result);
        assertEquals("Assert 5:", '0', carray[0]);
        assertEquals("Assert 6:", '1', carray[1]);

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        assertEquals("Assert 8:", '3', carray[3]);
        assertEquals("Assert 9:", '4', br.read());
        assertEquals("Assert 10:", -1, br.read());


        BufferedReader reader = new BufferedReader(new StringReader("01234"));
        reader.mark(Integer.MAX_VALUE);
        reader.read();
        reader.close();
  }


  /**

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    static void printBody(PrintWriter pw, HttpServletRequest req) throws IOException
    {
        BufferedReader in = req.getReader() ;
        if ( req.getContentLength() > 0 )
            // Need +2 because last line may not have a CR/LF on it.
            in.mark(req.getContentLength()+2) ;
        else
            // This is a dump - try to do something that works, even if inefficient.
            in.mark(100*1024) ;

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        if ( req.getContentLength() > 0 )
            // Need +2 because last line may not have a CR/LF on it.
            in.mark(req.getContentLength()+2) ;
        else
            // This is a dump - try to do something that works, even if inefficient.
            in.mark(100*1024) ;




        while(in.ready())
        {
            pw.println(in.readLine());

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      chars[i] = (char) i;
    Reader in = new BufferedReader(new Support_StringReader(new String(
        chars)), 12);


    in.skip(6);
    in.mark(14);
    in.read(new char[14], 0, 14);
    in.reset();
    assertTrue("Wrong chars", in.read() == (char) 6
        && in.read() == (char) 7);

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    assertTrue("Wrong chars", in.read() == (char) 6
        && in.read() == (char) 7);


    in = new BufferedReader(new Support_StringReader(new String(chars)), 12);
    in.skip(6);
    in.mark(8);
    in.skip(7);
    in.reset();
    assertTrue("Wrong chars 2", in.read() == (char) 6
        && in.read() == (char) 7);

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    in.reset();
    assertTrue("Wrong chars 2", in.read() == (char) 6
        && in.read() == (char) 7);
    
        BufferedReader br = new BufferedReader(new StringReader("01234"), 2);
        br.mark(3);
        char[] carray = new char[3];
        int result = br.read(carray);
        assertEquals(3, result);
        assertEquals("Assert 0:", '0', carray[0]);
        assertEquals("Assert 1:", '1', carray[1]);

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        assertEquals("Assert 1:", '1', carray[1]);
        assertEquals("Assert 2:", '2', carray[2]);
        assertEquals("Assert 3:", '3', br.read());


        br = new BufferedReader(new StringReader("01234"), 2);
        br.mark(3);
        carray = new char[4];
        result = br.read(carray);
        assertEquals("Assert 4:", 4, result);
        assertEquals("Assert 5:", '0', carray[0]);
        assertEquals("Assert 6:", '1', carray[1]);

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        assertEquals("Assert 8:", '3', carray[3]);
        assertEquals("Assert 9:", '4', br.read());
        assertEquals("Assert 10:", -1, br.read());


        BufferedReader reader = new BufferedReader(new StringReader("01234"));
        reader.mark(Integer.MAX_VALUE);
        reader.read();
        reader.close();
  }


  /**

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