?? growbufferedreader.java
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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(); } }}
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