Code That Made Me Cry, #CTMMC™

95% of all code makes me cry. The other 5% are white space.

Adding Entropy to Your JVM (Java, #2 / 50)

public class Entropy {
  public static void main(String[] args)
  throws Exception {

    // Extract the IntegerCache through reflection
    Class clazz = Class.forName(
    Field field = clazz.getDeclaredField("cache");
    Integer[] cache = (Integer[]) field.get(clazz);

    // Rewrite the Integer cache
    for (int i = 0; i < cache.length; i++) {
      cache[i] = new Integer(
        new Random().nextInt(cache.length));

    // Prove randomness
    for (int i = 0; i < 10; i++) {
      System.out.println((Integer) i);

While this example is fictional, it still shows that horrible things can be done with reflection


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