### Question:
ArtifactVersion implements Comparable<ArtifactVersion> { private <T extends Comparable<T>> int compare(@Nullable T first, @Nullable T second) { if (first == null && second == null) { return 0; } if (first == null) { return -1; } if (second == null) { return 1; } return first.compareTo(second); } ArtifactVersion(String str);  ArtifactVersion(String str, boolean matchSuffix); @Nullable String getVersion(); @Nullable Integer getMajor(); @Nullable Integer getMinor(); @Nullable Integer getFix(); @Nullable String getSuffix(); boolean isSnapshot(); @Override int compareTo(ArtifactVersion other); @Override boolean equals(Object o); @Override int hashCode(); @Override String toString();  }### Answer:
@Test public void testCompare() { ArtifactVersion smaller = new ArtifactVersion("1.5.0"); ArtifactVersion larger = new ArtifactVersion("2.0.0-SNAPSHOT"); assertVersion(smaller, larger); smaller = new ArtifactVersion("3.1.8"); larger = new ArtifactVersion("3.2.0"); assertVersion(smaller, larger); smaller = new ArtifactVersion("3.2.0"); larger = new ArtifactVersion("3.2.5-SNAPSHOT"); assertVersion(smaller, larger); smaller = new ArtifactVersion("6.0.0-SNAPSHOT"); larger = new ArtifactVersion("6.0.0"); assertVersion(smaller, larger); smaller = new ArtifactVersion("6.0.0-SNAPSHOT"); larger = new ArtifactVersion("6.0.0.0"); assertVersion(smaller, larger); smaller = new ArtifactVersion("6.0.0.0"); larger = new ArtifactVersion("6.0.0.2"); assertVersion(smaller, larger); smaller = new ArtifactVersion("6.0.0"); larger = new ArtifactVersion("6.0.0.0"); assertVersion(smaller, larger); smaller = new ArtifactVersion("6.0.0-SNAPSHOT"); larger = new ArtifactVersion("6.0.0-SNAPSHOT1"); assertVersion(smaller, larger); smaller = new ArtifactVersion("6"); larger = new ArtifactVersion("6.0"); assertVersion(smaller, larger); smaller = new ArtifactVersion("6.0"); larger = new ArtifactVersion("6.0.0"); assertVersion(smaller, larger); smaller = new ArtifactVersion("6.0.0"); larger = new ArtifactVersion("6.0.0"); Assert.assertEquals(0, smaller.compareTo(larger)); smaller = new ArtifactVersion("6.0.0.0"); larger = new ArtifactVersion("6.0.0.0"); Assert.assertEquals(0, smaller.compareTo(larger)); smaller = new ArtifactVersion("6.0.0-SNAPSHOT"); larger = new ArtifactVersion("6.0.0-SNAPSHOT"); Assert.assertEquals(0, smaller.compareTo(larger)); }