### Question:
LogId implements Comparable<LogId>, Copiable<LogId>, Serializable, Checksum { @Override public int compareTo(final LogId o) { final int c = Long.compare(getTerm(), o.getTerm()); if (c == 0) { return Long.compare(getIndex(), o.getIndex()); } else { return c; } } LogId();  LogId(final long index, final long term); @Override LogId copy(); @Override long checksum(); @Override int hashCode(); @Override boolean equals(final Object obj); @Override int compareTo(final LogId o); long getTerm(); void setTerm(final long term); long getIndex(); void setIndex(final long index); @Override String toString();  }### Answer:
@Test public void testCompareTo() { LogId logId = new LogId(); assertEquals(0, logId.getIndex()); assertEquals(0, logId.getTerm()); assertTrue(new LogId(1, 0).compareTo(logId) > 0); assertTrue(new LogId(0, 1).compareTo(logId) > 0); logId = new LogId(1, 2); assertTrue(new LogId(0, 1).compareTo(logId) < 0); assertTrue(new LogId(0, 2).compareTo(logId) < 0); assertTrue(new LogId(3, 1).compareTo(logId) < 0); assertTrue(new LogId(1, 2).compareTo(logId) == 0); }