public class CompareVersionNumbers {

//This code assumes that next level is zero if no mo levels in shorter version number. And than compare levels.

public int compareVersion11(String version1, String version2) {

String[] levels1 = version1.split("\\.");

String[] levels2 = version2.split("\\.");

int length = Math.max(levels1.length, levels2.length);

for (int i=0; i<length; i++) {

Integer v1 = i < levels1.length ? Integer.parseInt(levels1[i]) : 0;

Integer v2 = i < levels2.length ? Integer.parseInt(levels2[i]) : 0;

int compare = v1.compareTo(v2);

if (compare != 0) {

return compare;

}

}

return 0;

}

/*

wrong:

Input:

"01"

"1"

Output:

-1

Expected:

0

*/

public int compareVersion(String version1, String version2) {

String[] s1 = version1.split("\\."); // !!!!

String[] s2 = version2.split("\\.");

int len = Math.min(s1.length, s2.length);

for(int i = 0; i < len; i++){

if(s1[i].compareTo(s2[i]) > 0){

return 1;

}

else if(s1[i].compareTo(s2[i]) < 0){

return -1;

}

}

return 0;

}

}