Compare Version Numbers

class Solution {
    public int compareVersion(String version1, String version2) {
        version1 = addSpaces(version1);
        version2 = addSpaces(version2);
        String[] v1 = version1.split(" . ");
        String[] v2 = version2.split(" . ");
        for(int i = 0; i<v1.length; i++){
            int lastZ = -1;
            for(int j = 0; j<v1[i].length()-1; j++){
                if(v1[i].charAt(j) != '0'){
                    break;
                }
                lastZ = j;
            }
            if(lastZ >= 0){
                v1[i] = v1[i].substring(lastZ+1);
            }
        }
        for(int i = 0; i<v2.length; i++){
            int lastZ = -1;
            for(int j = 0; j<v2[i].length()-1; j++){
                if(v2[i].charAt(j) != '0'){
                    break;
                }
                lastZ = j;
            }
            if(lastZ >= 0){
                v2[i] = v2[i].substring(lastZ+1);
            }
        }
        int len = Math.max(v2.length, v1.length);
        for(int i = 0; i<len; i++){
            int v1Val = 0;
            int v2Val = 0;
            if(i < v1.length){
                v1Val = Integer.parseInt(v1[i]);
            } 
            if(i < v2.length){
                v2Val = Integer.parseInt(v2[i]);
            }
            if(v1Val > v2Val){
                return 1;
            }
            else if(v1Val < v2Val){
                return -1;
            }
        }
        return 0;
    }
    public String addSpaces(String version2){
        for(int i = 0; i<version2.length(); i++){
            if(version2.charAt(i) == '.'){
                version2 = version2.substring(0, i) + " . " + version2.substring(i+1);
                i++;
            }
        }
        return version2;
    }
}