Compare Version Numbers

Compare Version Numbers 

Compare two version numbers version1 and version1.
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

public class Solution {
    public int compareVersion(String version1, String version2) {        
        String ver1_ch[] = version1.split("\.");
        String ver2_ch[] = version2.split("\.");
               
        int i = 0;
        for(; i < ver1_ch.length && i <ver2_ch.length; i++){
            
            if(Integer.valueOf(ver1_ch[i]) > Integer.valueOf(ver2_ch[i]))
                return 1;
            else if(Integer.valueOf(ver1_ch[i]) < Integer.valueOf(ver2_ch[i]))
                return -1;
        }
        if(i >= ver1_ch.length && i >= ver2_ch.length)
            return 0;
        else if(i >= ver1_ch.length){
            for(; i < ver2_ch.length; i++){
                if(Integer.valueOf(ver2_ch[i]) > 0)
                    return -1;
            }
            return 0;
        }
        else
        {
            for(; i < ver1_ch.length; i++){
                if(Integer.valueOf(ver1_ch[i]) > 0)
                    return 1;
            }
            return 0;
        }
    }
}