/* * Copyright (c) 1995 - 2008 Sun Microsystems, Inc.  All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * *   - Redistributions of source code must retain the above copyright *     notice, this list of conditions and the following disclaimer. * *   - Redistributions in binary form must reproduce the above copyright *     notice, this list of conditions and the following disclaimer in the *     documentation and/or other materials provided with the distribution. * *   - Neither the name of Sun Microsystems nor the names of its *     contributors may be used to endorse or promote products derived *     from this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ import java.io.BufferedReader;import java.io.CharArrayReader;import java.io.FileNotFoundException;import java.io.IOException;import java.lang.reflect.Field;import java.util.Arrays;import static java.lang.System.out;public class GrowBufferedReader {    private static final int srcBufSize = 10 * 1024;    private static char[] src = new char[srcBufSize];    static {	src[srcBufSize - 1] = 'x';    }    private static CharArrayReader car = new CharArrayReader(src);    public static void main(String... args) {	try {	    BufferedReader br = new BufferedReader(car);	    Class<?> c = br.getClass();	    Field f = c.getDeclaredField("cb");	    // cb is a private field	    f.setAccessible(true);	    char[] cbVal = char[].class.cast(f.get(br));	    char[] newVal = Arrays.copyOf(cbVal, cbVal.length * 2);	    if (args.length > 0 && args[0].equals("grow"))		f.set(br, newVal);	    for (int i = 0; i < srcBufSize; i++)		br.read();	    // see if the new backing array is being used	    if (newVal[srcBufSize - 1] == src[srcBufSize - 1])		out.format("Using new backing array, size=%d%n", newVal.length);	    else		out.format("Using original backing array, size=%d%n", cbVal.length);        // production code should handle these exceptions more gracefully	} catch (FileNotFoundException x) {	    x.printStackTrace();	} catch (NoSuchFieldException x) {	    x.printStackTrace();	} catch (IllegalAccessException x) {	    x.printStackTrace();	} catch (IOException x) {	    x.printStackTrace();	}    }}