### Question:
Version implements Comparable<Version> { @Override public boolean equals(Object obj) { if (this == obj) { return true; } if (obj == null) { return false; } if (getClass() != obj.getClass()) { return false; } Version other = (Version) obj; return (major == other.major) && (minor == other.minor) && (micro == other.micro) && qualifier.equals(other.qualifier); } Version(int major, int minor, int micro, String qualifier);  Version(int major, int minor, int micro); static boolean isLegalSyntax(String candidate); static Version parseVersionIncludeNull(String version); static Version parseVersion(String version); int getMajor(); int getMinor(); int getMicro(); String getQualifier(); boolean lessThan(Version other); boolean lessThanOrEqual(Version other); boolean greaterThan(Version other); boolean greaterThanOrEqual(Version other); Version incrementMajor(); Version incrementMinor(); Version incrementMicro(); @Override int hashCode(); @Override boolean equals(Object obj); @Override int compareTo(Version o); @Override String toString(); static final char VERSION_SECTION_SEPARATOR; static final String QUALIFIER_REGEX; static final Pattern VERSION_PATTERN; static final int REGEX_GROUP_NUMBER_MAJOR; static final int REGEX_GROUP_NUMBER_MINOR; static final int REGEX_GROUP_NUMBER_MICRO; static final int REGEX_GROUP_NUMBER_QUALIFIER; static final Pattern QUALIFIER_PATTERN; static final String VERSION_FORMAT_DESCRIPTION; }### Answer:
@Test public void testEquals() { Version v1 = new Version(1, 2, 3); Version v2 = new Version(1, 2, 3); Assert.assertTrue(v1.equals(v1)); Assert.assertTrue(v1.equals(v2)); Assert.assertTrue(v1.lessThanOrEqual(v2)); Assert.assertTrue(v1.greaterThanOrEqual(v2)); Assert.assertTrue(v2.lessThanOrEqual(v1)); Assert.assertTrue(v2.greaterThanOrEqual(v1)); Assert.assertTrue(v1.lessThanOrEqual(v1)); Assert.assertTrue(v1.greaterThanOrEqual(v1)); Assert.assertTrue(v1.compareTo(v2) == 0); }