### Question:
Csn implements Comparable<Csn> { public Csn( long timestamp, int changeCount, int replicaId, int operationNumber ) { this.timestamp = timestamp; this.replicaId = replicaId; this.operationNumber = operationNumber; this.changeCount = changeCount; sdf.setTimeZone( UTC_TIME_ZONE ); } Csn( long timestamp, int changeCount, int replicaId, int operationNumber );  Csn( String value );   Csn( byte[] value ); static boolean isValid( String value ); byte[] getBytes(); long getTimestamp(); int getChangeCount(); int getReplicaId(); int getOperationNumber(); @Override String toString(); @Override int hashCode(); @Override boolean equals( Object o ); @Override int compareTo( Csn csn );  }### Answer:
@Test public void testCSN() { synchronized ( SDF ) { long ts = System.currentTimeMillis(); Csn csn = new Csn( SDF.format( new Date( ts ) ) + "#123456#abc#654321" ); assertEquals( ts / 1000, csn.getTimestamp() / 1000 ); assertEquals( 1193046, csn.getChangeCount() ); assertEquals( 6636321, csn.getOperationNumber() ); assertEquals( 2748, csn.getReplicaId() ); } }