CodePoints implements Serializable { @Override public int hashCode() { return set.hashCode(); } CodePoints(Integer... codePoints);  CodePoints(String... strings);  CodePoints(Collection<Integer> codePoints);  CodePoints(CodePoints codePoints); boolean containsAll(String s); int firstExcludedCodePoint(String s); Set<Integer> allExcludedCodePoints(String s); CodePoints union(CodePoints codePoints); CodePoints subtract(CodePoints codePoints); CodePoints intersect(CodePoints codePoints); @SuppressWarnings("unchecked") static T of(Class<T> clazz); static boolean containsAllInAnyCodePoints(String s,
            final CodePoints... codePointsList); @Override boolean equals(Object o); @Override int hashCode(); static final int NOT_FOUND; }
@Test public void testHashCode() { CodePoints cp1 = new CodePoints("ABCD"); CodePoints cp2 = new CodePoints("ABCD"); assertThat(cp1.hashCode(), is(cp2.hashCode())); }