RevisionVector implements Iterable<Revision>, Comparable<RevisionVector>, CacheValue { @Override public int hashCode() { if (hash == 0){ hash = Arrays.hashCode(revisions); } return hash; } private  RevisionVector(@NotNull Revision[] revisions,
                           boolean checkUniqueClusterIds,
                           boolean sort);  RevisionVector(@NotNull Revision... revisions);  RevisionVector(@NotNull Iterable<Revision> revisions);  RevisionVector(@NotNull Set<Revision> revisions); RevisionVector update(@NotNull Revision revision); RevisionVector remove(int clusterId); RevisionVector pmin(@NotNull RevisionVector vector); RevisionVector pmax(@NotNull RevisionVector vector); RevisionVector difference(RevisionVector vector); boolean isRevisionNewer(@NotNull Revision revision); boolean isBranch(); @NotNull Revision getBranchRevision(); Revision getRevision(int clusterId); String asString(); StringBuilder toStringBuilder(StringBuilder sb); static RevisionVector fromString(String s); RevisionVector asTrunkRevision(); RevisionVector asBranchRevision(int clusterId); int getDimensions(); @Override int getMemory(); @Override int compareTo(@NotNull RevisionVector other); @Override Iterator<Revision> iterator(); @Override String toString(); @Override boolean equals(Object o); @Override int hashCode();  }
@Test public void hashCodeTest() { RevisionVector rv1 = new RevisionVector(); RevisionVector rv2 = new RevisionVector(); assertEquals(rv1.hashCode(), rv2.hashCode()); assertEquals(rv1.hashCode(), rv2.hashCode()); Revision r11 = new Revision(1, 0, 1); rv1 = rv1.update(r11); rv2 = rv2.update(r11); assertEquals(rv1.hashCode(), rv2.hashCode()); Revision r12 = new Revision(1, 0, 2); rv1 = rv1.update(r12); rv2 = rv2.update(r12); assertEquals(rv1.hashCode(), rv2.hashCode()); }