### Question:
UuidTransactionId implements TransactionId { @Override public String getId() { return uuid.toString(); } UuidTransactionId();  UuidTransactionId(String uuid);  UuidTransactionId(UUID uuid); @Override String getId(); @Override int hashCode(); @Override boolean equals(Object obj);  }### Answer:
@Test public void testConstructors() { UUID uuid = UUID.randomUUID(); UuidTransactionId id = new UuidTransactionId(uuid); String uuidString = "9287bafe-cba6-472a-bffe-9823751095ba"; UuidTransactionId idFromString = new UuidTransactionId(uuidString); assertEquals(uuid.toString(), id.getId()); assertEquals(uuidString, idFromString.getId()); }