Compare two version numbers version1 and version2.
If version1 > version2 return 1, if version1 < version2 return -1, otherwise return 0.

You may assume that the version strings are non-empty and contain only digits and the . character.
The . character does not represent a decimal point and is used to separate number sequences.
For instance, 2.5 is not “two and a half” or “half way to version three”, it is the fifth second-level revision of the second first-level revision.

Here is an example of version numbers ordering:

0.1 < 1.1 < 1.2 < 13.37

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public class Solution {
    public int compareVersion(String version1, String version2) {
        String[] v1 = version1.split("\\.");
        String[] v2 = version2.split("\\.");
        int length = Math.max(v1.length, v2.length), l1 = v1.length, l2 = v2.length;
        
        for (int i = 0; i < length; i++){
            Integer i1 = (i >= l1) ? 0 : Integer.parseInt(v1[i]);
            Integer i2 = (i >= l2) ? 0 : Integer.parseInt(v2[i]);
            int compare = i1.compareTo(i2);
            if (compare != 0){
                return compare;
            }
        }
        return 0;
    }
}