VersionHelper.java

public class VersionHelper {

    /**
     * Compares one version string to another version string by dotted ordinals.
     * eg. "1.0" > "0.09" ; "0.9.5" < "0.10",
     * also "1.0" < "1.0.0" but "1.0" == "01.00"
     *
     * ref: https://stackoverflow.com/questions/6701948/efficient-way-to-compare-version-strings-in-java
     *
     * @param left  the left hand version string
     * @param right the right hand version string
     * @return 0 if equal, -1 if thisVersion &lt; comparedVersion and 1 otherwise.
     */
    public static int compare(@NotNull String left, @NotNull String right) {
        if (left.equals(right)) {
            return 0;
        }
        int leftStart = 0, rightStart = 0, result;
        do {
            int leftEnd = left.indexOf('.', leftStart);
            int rightEnd = right.indexOf('.', rightStart);
            Integer leftValue = Integer.parseInt(leftEnd < 0
                    ? left.substring(leftStart)
                    : left.substring(leftStart, leftEnd));
            Integer rightValue = Integer.parseInt(rightEnd < 0
                    ? right.substring(rightStart)
                    : right.substring(rightStart, rightEnd));
            result = leftValue.compareTo(rightValue);
            leftStart = leftEnd + 1;
            rightStart = rightEnd + 1;
        } while (result == 0 && leftStart > 0 && rightStart > 0);
        if (result == 0) {
            if (leftStart > rightStart) {
                return containsNonZeroValue(left, leftStart) ? 1 : 0;
            }
            if (leftStart < rightStart) {
                return containsNonZeroValue(right, rightStart) ? -1 : 0;
            }
        }
        return result;
    }

    private static boolean containsNonZeroValue(String str, int beginIndex) {
        for (int i = beginIndex; i < str.length(); i++) {
            char c = str.charAt(i);
            if (c != '0' && c != '.') {
                return true;
            }
        }
        return false;
    }
}

VersionHelperTest.java

public class VersionHelperTest {

    @Test
    public void testCompare() throws Exception {
        assertEquals(1, VersionHelper.compare("1", "0.9"));
        assertEquals(1, VersionHelper.compare("0.0.0.2", "0.0.0.1"));
        assertEquals(1, VersionHelper.compare("1.0", "0.9"));
        assertEquals(1, VersionHelper.compare("2.0.1", "2.0.0"));
        assertEquals(1, VersionHelper.compare("2.0.1", "2.0"));
        assertEquals(1, VersionHelper.compare("2.0.1", "2"));
        assertEquals(1, VersionHelper.compare("0.9.1", "0.9.0"));
        assertEquals(1, VersionHelper.compare("0.9.2", "0.9.1"));
        assertEquals(1, VersionHelper.compare("0.9.11", "0.9.2"));
        assertEquals(1, VersionHelper.compare("0.9.12", "0.9.11"));
        assertEquals(1, VersionHelper.compare("0.10", "0.9"));
        assertEquals(0, VersionHelper.compare("0.10", "0.10"));
        assertEquals(-1, VersionHelper.compare("2.10", "2.10.1"));
        assertEquals(-1, VersionHelper.compare("0.0.0.2", "0.1"));
        assertEquals(1, VersionHelper.compare("1.0", "0.9.2"));
        assertEquals(1, VersionHelper.compare("1.10", "1.6"));
        assertEquals(0, VersionHelper.compare("1.10", "1.10.0.0.0.0"));
        assertEquals(1, VersionHelper.compare("1.10.0.0.0.1", "1.10"));
        assertEquals(0, VersionHelper.compare("1.10.0.0.0.0", "1.10"));
        assertEquals(1, VersionHelper.compare("1.10.0.0.0.1", "1.10"));
    }
}