SeverityComparator implements Comparator<LogRecord>, Serializable { @Override public int hashCode() { return 31 * getClass().hashCode(); }  Throwable apply(final Throwable chain); final int applyThenCompare(Throwable tc1, Throwable tc2); int compareThrowable(final Throwable t1, final Throwable t2); int compare(final LogRecord o1, final LogRecord o2); @Override boolean equals(final Object o); @Override int hashCode(); boolean isNormal(final Throwable t);  }
@Test public void testHashCode() { final SeverityComparator a = new SeverityComparator(); final SeverityComparator b = new SeverityComparator(); assertNotSame(a, b); assertTrue(a.equals(b)); assertTrue(b.equals(a)); assertEquals(a.hashCode(), b.hashCode()); }