A DESCRIPTION OF THE REQUEST :
Enum.hashCode() call System.identityHashCode() that
is seven times slower than Object.hashCode().

Note that I don't know why and perhaps, System.identityHashCode()
may be optimized.

JUSTIFICATION :
it's improve performance

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
public final int hashCode() {
    return super.hashCode();
}
ACTUAL -
public final int hashCode() {
    return System.identityHashCode(this);
}

---------- BEGIN SOURCE ----------
It's just a micro benchmark than test super.hashCode()
and System.identityHashCode(this)

/**
 * @author remi
 *
 */
public class MyEnumTest {
  static class Zuper {
    public final int hashCode() {
      return super.hashCode();
    }
  }
  static class Identity {
    public final int hashCode() {
      return System.identityHashCode(this);
    }
  }
  static long test(Object o) {
    long time=System.nanoTime();
    for(int i=0;i<1000000;i++)
      o.hashCode();
    return System.nanoTime()-time;
  }
  public static void main(String[] args) {
    System.out.println("super "+test(new Zuper()));
    System.out.println("identity "+test(new Identity()));
  }
}

---------- END SOURCE ----------
###@###.### 10/21/04 23:26 GMT