### Question:
Ipv6 extends AbstractIp<Ipv6, Ipv6Range> { @Override public boolean hasPrevious() { return this.compareTo(FIRST_IPV6_ADDRESS) > 0; } protected  Ipv6(BigInteger value); static Ipv6 of(BigInteger value); static Ipv6 of(String value); @Override int compareTo(Ipv6 other); @Override Ipv6 next(); @Override Ipv6 previous(); @Override boolean hasNext(); @Override boolean hasPrevious(); @Override Ipv6Range asRange(); @Override String toString(); static Ipv6 parse(final String ipv6Address); @Override int bitSize(); @Override BigInteger asBigInteger(); @Override Ipv6 lowerBoundForPrefix(int prefixLength); @Override Ipv6 upperBoundForPrefix(int prefixLength); @Override int getCommonPrefixLength(Ipv6 other); @Override boolean equals(Object o); @Override int hashCode(); static final BigInteger FOUR_OCTECT_MASK; static final int NUMBER_OF_BITS; static final BigInteger MINIMUM_VALUE; static final BigInteger MAXIMUM_VALUE; static final Ipv6 FIRST_IPV6_ADDRESS; static final Ipv6 LAST_IPV6_ADDRESS; }### Answer:
@Test public void testHasPrevious() { assertFalse(Ipv6.FIRST_IPV6_ADDRESS.hasPrevious()); assertTrue(Ipv6.of("1:2:3:4:5:6:7:8").hasPrevious()); assertTrue(Ipv6.LAST_IPV6_ADDRESS.hasPrevious()); }