### Question:
JmsProducerId extends JmsAbstractResourceId implements Comparable<JmsProducerId> { @Override public int compareTo(JmsProducerId other) { return toString().compareTo(other.toString()); } JmsProducerId(JmsSessionId sessionId, long producerId);  JmsProducerId(JmsProducerId id);  JmsProducerId(String connectionId, long sessionId, long producerId);  JmsProducerId(String producerKey); JmsSessionId getParentId(); String getConnectionId(); long getValue(); long getSessionId(); @Override String toString(); @Override int hashCode(); @Override boolean equals(Object o); @Override int compareTo(JmsProducerId other);  }### Answer:
@Test public void testCompareTo() { JmsProducerId id1 = new JmsProducerId(firstId, 1); JmsProducerId id2 = new JmsProducerId(secondId, 1); assertEquals(-1, id1.compareTo(id2)); assertEquals(0, id1.compareTo(id1)); assertEquals(1, id2.compareTo(id1)); }