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();	}    }}